􀁾􀁩􀀻􀀯􀀬'j' 􀀧􀀺􀀢􀀧􀀺􀀧􀀢􀁾􀁕􀀴􀀴􀁾􀁾􀁾􀂷􀁾􀁾􀀢􀀬􀀮􀂷􀂷􀀻􀂷􀂷􀂷􀂷􀁾􀀮􀂷􀀮􀁾􀂷􀂷􀁴􀀬􀀨􀀮􀀺􀀮􀀧􀀺􀀩􀂷􀀢􀂥􀀠'."." 􀀾􀀮􀁊􀀧􀀮􀀧􀁾􀀢􀀢􀀬􀀧􀀢􀀧􀀠/-.! . r; WG ; 􀀬􀁗􀁲􀁴􀀭􀁾􀀨􀀠b'".'."v,'->''''''-'''·''' '· ,"'., '.<' ·'h'-:' . ','""",,:,.. . ", 􀀢􀀢􀀧􀀼􀀢􀁖􀀢􀀸􀀺􀀢􀀧􀀻􀀧􀀮􀀢􀀮􀀭􀀮􀁾􀀭􀂷􀁾􀀮􀀢􀀢􀁾􀀬􀀬􀀬...'e.,· National Engineering Managers Meeting Charlotte, North Carolina Anril4 , 1., 1990 Delta Environmental Consultants, Inc. facilities; wastewater discharges; and iJUection wells. Two issues not from Chapter 305, Subchapter E, are discussed here, however-notice of hearing on air quality permit applications and notice ofhearing on contested enforcement cases. In the future, the Comntission plans to add more types ofapplications to the new chapter. In • related move, TNRCC proposed in the June 25 Texas Register the repeal of Chapter 305, Subchapter E. concerning consolidated permits; in its entirety. INFO: Contact Richard O'Connell at (512) 239. 5528, or see 21 TexReg 5539 for the proposed rule chapter, and 21 TexReg 5842 for the proposed repeal. Aquifer Storage Regulations Adopted A package of new aqnifer storage and permit exemption rules has been approved by TNRCC, according to the June 14 Teras Register. The rules were proposed in order to implement 1995's HB 1989, which directed TNRCC 10 investigate the feasibility ofstllring appropriated water in various aquifers around the state by encouraging the issuance of temporary or lenn permits. Through this rule package, TNRCC is limiting the applicability of new pennits for aquifer storage and retrieval projects that entail the underground storage of appropriated surface water 10 certain areas around the state. The Commission notes that these rules will nOI apply 10 any existing permit, permit amendment, or to any permit application filed prior to June 5, 1995 (the bill's effective date). INFO: Contact James Kowis at (512) 239-4900, or see 21 TexReg 5441 and 5443. TNRCC Adopts Tire Recycling Program Changes More than SO changes are included in a rule package concerning the Waste Tire Recycling Program adopted in the June 21 Teras Register. Some provisions are repealed, revisions of existing rules are made, and new sections are adopted as pan of the package. The changes deal primarily with payments to waste tire energy recovery facilities 250 8 and larger (d) Minimum pressure requirement The system must be designed to maintain a minimum pressure of 35 psi at all points within the distribution network at flow rales ofat least 15 gallons per minute per connection. When the system is intended to provide fife fighting capability, it must also be designed to maintain a minimum pressure of 20 psi under combined flre and drinking water flow conditions. (I) Air release devices shall be installed in the distribution system at all points where topography or other faclOlS may create air locks in the lines. Air release devices shall be installed in such a manner as to preclude the possibility of submergence or possible entrance of contaminants. In this respect, all openings to the atmosphere shall be covered with 16-mesh or finer, corrosion-resistant screening material or an acceptable equivalent (2) When service is to be provided to more than one pressure plane or when distribution system conditions and demands are such that low pressures develop, the method of providing increased pressure shall be by means of booster pumps taking suction from storage tanks. Ifan exception to this requirement is desired, the deSigning engineer must furnish for the executive directors review all planning material for booster pumps .taking suction from other than a storage tank. The planning material must contain a full description of the supply to the point of suction, maximum demands on this part of the system, location of pressure recordelS, safety .controls and other pertinent infonnation. Where booster pumps are installed to take suction directly from the distribution system, a minimum residual presSlml of 20 pounds per square inch (psi) must be maintained on the suction line at all times. Such installations must be equipped with automatic presSlml cut-off devices so that the pumping units become inoperative at a suction presSlml of less than 20 psi. In addition, a continuous pressure recording device may be required at a predetermined suspected critical presSlml point on the suction line in order to record the hydraulic conditions in the line at all times. Ifsuch a record indicates ctitical minimum presSlmls (less than 20 psi), adequate storage facilities must be installed with the booster pomps taking suction from the storage facility. Fire pumps used to maintain pressure on automatic sprinkler systems only for flre protection purposes are not considered as in-line booster pumps. (3) Service connections that require booster pumps taking suction from the public water system lines must be equipped with automatic pressure cut-off devices so that the pumping units become inoperative at a suction pressure of less than 20 psi. Where these types of installations are necessary, the preferred method of pressure maintenance consists of an air gapped connection with a storage tank and subsequent repressurization facilities. Te.,as Narural Resou.n:e Conservation CommIssion Page 31 Chapter 290· Water Hygiene (.I) Each community public water system shall provide aecurnle metering devices at each service cOIIDection for the accumulation of water usage data. Systems where no direct charge is made for the water shall be exempted from this requirement. (5) The system shall be provided with sufficient valves and blowoflS so that necessary repairs can be made without undue interruption of service over any considernble area and for flushing lhe system w hen required. The engineering report shall establish emeria for this design. (6). The system shall be designed to alford effective circulation of water with a minimum of dead ends. AU dead.;:nd mains shall be provided with acceptable flush valves and discharge piping. All dead.;:nd lines less than two inches indiameter will not require flush valves if they end at a customer service. Where dead ends are necessary as a slage in the growth of the system, they shall be located and arranged with a view to ultimately cOruJecting them to provide circulation. (e) Location of water lines. (I) The following rules apply to installations of potsble water distribution lines and wastewater collection lines, wastewater force mains and other 􀁣􀁯􀁮􀁶􀁥􀁹􀁡􀁮􀁣􀁥􀁳􀁬􀁡􀁰􀁰􀁵􀁲􀁴􀁾􀁮􀁡􀁮􀁣􀁥􀁳 􀀠identified as potential sources of contamination. Furthennore, all rntings specified shall be defmed by ASTM or A WWA standards unless stated otherwise. (2) When new potsble water distribution lines are constructed, they shall be installed no closer than nine feet in all directions to wastewater collection facilities. All separation distances shall be measured ftom the outside surface ofeach of the respective pieces. (3) Potsble water distribution lines and wastewater collection lines or force mains that fonn paraJJel utility lines shall be installed in separate trenches. (4) No pbysicaJ connection shall be made between a drinking water supply and a sewer line. Any appurtenance shall be designed and constructed so as to prevent any possfbillty of sewage entering the drinking water system. . (5) W here the nine foot separation distance cannot be achieved, the following criteria shall !apply: (A) New Waterline Installation· ParaJJel Lines (i) Where a new potable waterline paraJJels an existing, non-pressure or pressure rated wastewater line/force main and the registered professional engineer is able to determine that the existing line is not leaking, the new potable waterline shall be located at least two feet above the existing line, measured vertically, and atleast four feet away, measured horizontally, from the existing line. EvelY effort shall be exerted not to disturb the bedding and backfill of the existing wastewater line. (ti) Where a new potable waterline paraJJels an existing pressure Illted wastewater line and it cannot be determined by the registered professional engineer ifthe existing line is leaking, the existing wastewater line shall be replaced with a 150 psi pressure Illted pipe. The new potable Texas Natural Resoun:e Conservation Commission Page 32 Chapter 290 -Water Hygiene waterline shall be located at least two feet above the new wastewater line. measured vertically. and at least four feet away, measured horizontally. from the replaced wastewater line. (iii) Where a new potable waterline parallels a new wastewater line/force main, the wastewater line shall be constructed of 150 psi pressure rated pipe. The new potable waterline shall located at least two feet above the wastewater line, measured vertically. and at least four feet away, measured hOrizontally, from the wastewater line. (B) New Waterline Installation -Crossing Lines (0 Where a new potable waterline crosses an existing, non-pressure rated wastewater line, one segment of the waterline pipe shall be centered over the wastewater line such thet the joints of the waterline pipe are equidistant and at least rtine feet horizontally from the centerline of the wastewater line. The potable waterline shall be at least two feet above the wastewater line. Whenever possible, the crossing shall be centered between the joints of the wastewater line. If the existing wastewater line is disturbed or shows signs of leaking, it shall be replaced for at least 9 feet in both directions (18 feet total) with 150 psi pressure rated pipe. (ti) Where a new potable waterline crosses an existing, pressure rated wastewater line, one segment of the waterline pipe shall be centered over the wastewater line such that the joints of the waterline pipe are equidistant and at least nine feet horizontally from the centerline of the wastewater line. The potable waterline shall be at least six inches above the wastewater line. Whenever possible, the crossing shall be centered between the joints of the wastewater line. If the existing wastewater line shows signs of leaking, it shall be replaced for at least 9 feet in both directions (18 feel total) with 150 psi pressure rated pipe. (ill) Where a new potable waterline crosses a new, non-pressure rated wastewater line and the standard pipe segment length of the wastewater line is at least 18 feet, one segment of the waterline pipe shall be centered over the wastewater line such that the joints of the waterline pipe are equidistant and at least nine feet horizontally from the centerline ofthe wastewater line. The potable waterline shall be at least two feet above the wastewater line. Whenever possible. the crossing shall be centered between the joints of the wastewater line. The wastewater pipe shall have a minimum pipe stiffness of 115 psi at five percent deflection. The wastewater line shall be embedded in cement stabilized sand (see §290.44(e)(5)(B)(vO of this title) for the total length of one pipe segment plus 12 inches beyond the joint on each end. (iv) Where a new potable waterline crosses a new, non-pressure rated wastewater line and a standard length of the wastewater pipe is less than 18 feet in length, the potable water pipe segment shall be centered over the wastewater line. The materials and method of installation shall shall conform with one of the mllowing options: (I) Within nine feet horizontally of either side of tile waterline. the wastewater pipe and joints shall be constru<:ted with pipe material having a minimum pressure rating of 150 psi. An absolute minimum vertical separation distance of two feet shall be provided. The wastewater line shall be located below the waterline. Texas Natural Reso=c Conservation Commission Page 33 Chapter 290· Water Hygiene (II) AU sections of wastewater line within nine feet horizontallv of the waterline shall be encased in an 18 foot (or longer) section of pipe, flexible encasing pipe shall have 'a minimum pipe stiffness of 115 psi at five percent deflection. The encasing pipe shall be centered on the waterline and shall be atleasl two nominal pipe diameters larger than the wastewater line. The space around the carrier pipe shall be supported at 5 foot (or less) intervals with spacers or be filled to the springJine with washed sand, Each end of the casing shall be sealed with water tight non-shrink cement grout or a manufactured water tight seal, An absolute minimum separation distance of six inches between the encasement pipe and the waterline shall be provided, The wastewater line shall be located below the waterline, (III) When a new waterline crosses under a wastewater line, the waterline will be encased as described for wastewater lines in section (II) above or constructed of ductile iron or steel pipe with mechanical or welded joints as appropriate. An absolute minimum separation distance of I foot between the water line and the wastewater line shall be provided. Both the waterline and wastewater line, must pass a pressure and leakage test as specified in A WWA C600 standanls. (v) Where a new potable waterline crosses a new, pressure rated wastewater line, one segmentof the waterline pipe shall be centered over the wastewater line such that the joints of the waterline pipe are equidistant and at least nine feet horizontally from the centerline of the wastewater line. The potable waterline shall be at least six inches above the wastewater line. Whenever possible, the crossing should be centered between the joints of the wastewater line. The wastewater pipe shall have a minimum pressure rating of 150 psi. The wastewater line shall be embedded in ccmetu stabilized sand for the total length ofone pipe segment plus 12 inches beyond the joint on each end. (vi) Where cement stabilized sand bedding is required, the cement stabilized sand shall have a minimum of 10 percent cement per cubic yard ofcement stabilized sand mixture, based on loose dry weight volume (at least 2.5 bags ofcement per cubic yard of mixture). The cement stabilized sand bedding shall be a minimum ofsix inches above and four inches below the sewer pipe. The use of brown coloting in cement slllbilized sand for wastewater line bedding is recommended for the identification of wastewater fonoe mains during future construction. (6) Waterline and Marthole Separation. The separation distance from a potable waterline 10 a martha Ie shall be a minimum of nine feet Where the nine foot separation distance cannot be achieved. the potable waterline shall be encased in a joint of 150 psi pressure class pipe at least 18 feet long and two nominal sizes larger than the new conveyance. The space around the caIrier pipe shall be supported at five feet intervals with spacers or be filled to the spring line with washed sand. The encasement pipe shall be centered on the crossing and both ends sealed with cement grout or 􀁭􀁡􀁮􀁾􀁤seal. (7) Location ofHre hydrants. Fire hydrants shall not be installed within nine feet vertically or horizontally ofany sanitary sewer line regardless ofconstruction, (8) Location of Supply/Suction Lines. Suction mains to pumping equipment shall not cross wastewater lines carrying domestic or industrial wastes. Raw water supply lines shall not be installed within five feet of any tile or concrete wastewater line. Texas Narural Resource ConseIVation Commission Page 􀀳􀁾􀀠Chapter 290· Water Hygiene (9) Proximity of Septic Tank Drainfie!ds. Waterlines shall not be installed closer than ten feet to septic tank drainfields. (1) Sanitary precautions and disinfection. Sanitary precautions, flushing, disinfection procedures and microbiological sampling as prescribed in A WW A standards for disinfecting water mains shall be followed in laying water lines. (1) Pipe shall not be laid in water or placed where it can be flooded with water or sewage during its storage or installation. (2) Special precautions must be taken when water lines are laid under any flowing or intennittent stream or semipermanent body of water such as marsh. bay or estuaty. In these cases, the water main shall be installed in a sepamte watertight pipe encasement and valves must be provided on each side of the crossing with facilities to allow the underwater portion of the system to be isolated and tested to determine that there are no leaks in the underwater line. Alternately, and with the Executive Director's permission, the watertight pipe encasement may be omitted. (3) New mains shall be thoroughly disinfected in accordance with A WWA Standard C651 and then flushed and sampled before being placed in service. Samples shall be collected for microbiological analysis to check the effectiveness of the disinfection procedure which shall be repeated ifcontamination persiSts. A minimum of one sample for each 1,000 feet ofcompleted water line will be required or at the next available sampling point beyond 1,000 feet as designated by the design engineer. (g) Interconnections. (1) Each proposal for a direct connection between public drinking water systems under sepamte administrative authority will be considered on an individual basis. (A) Documents covering the responsibility for sanitary control shall accompany the submitted planning material. (B) Each water supply shall be of a safe, potable qnaJlty. (2) Where an interconnection between systems is proposed to provide a second source of supply for one or both systems, the system being utilized as a second source ofsupply must be capable of supplying a minimum of0.3 5 gallons per minute per connection for the total number of connections in the combined distribution systems. (h) Backflow, siphonage. (I) No water connection from any public drinking water supply system shall be made to any establishment where an actual or potential contamination or system hazard exists without an air gap sepamtion between the drinking water supply and the source of potential contamination. The containment air gap is sometimes impractical and, instead, reliance must be placed on individnaJ "internal" air gaps or mechanical backtlow prevention devices. Under these conditions, additional protection shall be required at the meter in the formofa backtlow prevention device (in accordance with AWWA Standards C510 and Texas Narural Resou.n::e Conservation Commission Page 35 Chapter 290· Water Hygiene C51), aJ\d AWWA Manual MH) on those establishments handling substances deleterious or hazardous to the public health. The water purveyor need not require backflow protection at the water service entrance if an adequate cross-connection control program is in effect that includes an annual inspection and testing by a certified backflow prevention device tester. It will be the responsibility of the water purveyor to ensure that these requirements are met· (2) No waler connection from any public drinking water supply system shan be made to any condensing, cooling or industrial process or any other system of nonpotable usage over which the public water supply system officials do not have sanitary control, unless the said connection is made in accordance with the requirements of paragraph (1) of this subsection. Water from such systems cannot be returned to the potable water supply. (3) Overhead bulk water dispensing stations must must be provided with an air gap between the filling outlet hose and the receiving tank to protect against back siphonage and cross-contamination. (4) Effective JanU31)' I, 1996, all backflow prevention assemblies shall be tested upon installation by a recognized backflow prevention assembly tester and certified to be operating within specifications. Backflow prevention assemblies which are installed to provide Pl'9tection against high health hazards must also be tested and certified to be operating within specifications at least annually by a recognized backflow prevention device tester. (A) Recognized testers shall have completed a Comntission approved COUISe on cross connection control and backflow prevention and pass an examination adntinistered by the TNRCC or its designated agent The accredited tester classification shall be broken down into two categories: (il The "Genern1 Tester" is qualified to test and repair backflow prevention assemblies on any domestic, commercial, industrial or irrigation service. (Exception.Firelines· See "Fireline Tester" in §290.44(h)(A)(ti». (ti) The "Fire line Tester" is qualified to test and repair backflow prevention assemblies on lirelines only. The State Fire Marshall's office requines that a person perfornting maintenance on fll'etines must be employed by an Approved Fireline Contractor . ." (8) Individuals that can show proof of completion of a COUISe and passage ofan exam based on the ABPA or ASSE National exam, prior to the effective date of these regulations, may be recognized as accredited for the term of their current certification (not to exceed 3 years). (C) Gauges used in the testing ofbackflow prevention assemblies shall be tested for accumcy annually in accord;mce with the University ofSouthern California's Foundation ofCross Connection Control and Hydraulic Research andIor the American Water Works Association Mannal ofCross Connection Control (Manual M·14). Public water systems shall require testers to include test gauge serial numbers on "Test and Maintenance" report forms and ensure tester.; have gauges tested for accuracy. (D) A Test Report must be completed by the recognized backflow prevention assembly tester for each assembly tested. The signed and dated original must be submitted to the public water supplier for record keeping purposes. Should the tester choose to use a report format which differs Texas Natural Resource Conservation Commission Page 36 Chapter 290 -Water Hygiene from that found in Appendix F of this title, it must minimally contain all information required by the report form. (E) Test and maintenance reports shall be retained for a minimum of three years. The public water supplier must provide these records to commission staff for inspection upon request. (5) The use of a bacldlow prevention device at the service connection shall be considered as additional bacldlow protection and shall nol negate the use of bacldlow protection on internal hazards as outlined and enforced by local plumbing codes. (i) Water hauling. When drinking water is distributed by tank truck or traller, it must be accomplished in the following manner: (1) Water shall be obtained from an approved source. (2) The equipment used to haul the water must be approved by the executive director and must be constructed as follows: (A) The tank truck or traller shall be used for t:ra:nsporting drinking water only and shall be labeled "Drinking Water". Tanks which have been used previously for pulposes other than transporting potable liquids shall not be used for hauling drinking water. (B) The tank shall be watertight and of an approved malerial which is impervious and easily cleaned and disinfected. Any paint or coating and any plastic or fiberglass materials used as contacl surfaces must be approved by the United States Envirorunental Protection Agency, the United States Food and Drug Administtation, the Uuited States Public Health Service or the National Sanitation Foundation. Effective January I, 1993, any newly installed surfaces shall confOIm to ANSlINSF Standard 61 and must be certified by an organization accredited by ANSI. (C) The tank shall have a manhole and a manhole cover which overlaps the raised manhole opening by a minimum of two inches and teIminales in a downward direction The cover shall fit firmly on the manhole opening and shall be kept locked. (0) The tank shall have a vent which is faced downward and located 10 minimize the possibility of drawing contaminants into the stored water. The vent must be screened with 16-mesh or fmer corrosion resistant materiaL (E) COimections for filling and emptying the tank sha1I be properly protected to prevent the possible entrance of contanllnatiolL These openings must be provided with caps and keeper cbains. (F) A drain shall be provided which wili complelely empty the tank for cleaning or repairs. (G) When a pump is used to transfer the water from the tank, the pump shall be permanently mounted with a permanent connection to the tank. The discharge side of the pump shall be properly protected between uses by a protective cap and keeper chain. Texas Nawral Resource Conservation Commission Page 37 Chaplet 290· Waler Hygiene (H) Hoses used for the transfer of drinking water to and from the tank shall be used only for that purpose and labeled for drinking water only, The hoses shall conform to ANSIINSF Standard 61 and must be certified by an entity recognized by lbe Commission, Hoses and related appurtenances must be cleaned and disinfected on a regular basis during prolonged use or before start-up during inlermittent use. Hoses must be properly stored between uses and must be provided with caps and keeper chains or have the ends connected together, (I) The tank sball be disinfected monthly and at any time tbat contamination is suspected, (1) At least one sample per morrtb from each tank sball be coHecled and submitted for microbiological analysis to one of lbe Commission's approved Iaborntories for each month of operation, (K) A mirtimum free chlorine residual of 0.5 mgll or, ifchlommines are used as the primary disinfectant, a chloramine residual of 1.0 mgll (measured as total chlorine) shall be maintained in the waler being hauled, Chlorine or chlorine contllning compounds may be added on a "batch" basis to maintllfi lbe required residual, (L) Operntional records detailing the amount of water hauled. purchases, microbiological sampling results, chlorine residual readings, dates of disinfection and source of water shall be maintained, Adopted February 5, 1997 Effective March 3, 1997 §290.45. Minimum Water System Capacity Requirements. (a) General Provisions. The following requirements are to be used in evaluating hath the total capacities for public water systems and the capacities at individual pttmp stations and pressure planes, The capacities listed below are mirtimttm requirements only. Additional supply, s(ornge, service pttmping, and presSUR maintenance facilities will be required by the commission ifa nonna! operating pressure of 3 5 psi cannot be maintllned throughout the system, or ifthe system's maximttm daily demand exceeds its total production and treatment capacity. Additioual capacities will also be required !fthe system is unable to maintain a miniminn pressure of 20 psi during fire fighting, line flushing and other unusual conditions. In all sections governiI\ll quantity requirements, total storage capacity does not include pressure tank capacity. (b) Community Water Systems. (I) Ground water supply requirements are as follows: (A) Iffewer than 50 connections without grcund storage, the system must have the following: (i) a well capacity of 1.5 gallons per minute per connection; and (ii) a pressure tank capacity of 50 gallons per connection. Texas Naturnl Resoun:e Conservation Commission Page 38 Chapter 290 -Water Hygiene (B) Iffewer than 50 connections with ground storage, the system must have the following: (il a well capacity of 0.6 gallon per minute per connection; (ii) a total storage capacity of 200 gallons per connection; (ill) two or more service pumps having a tolal capacity of 2.0 gallons per minute per connection; and (iv) a pressure tank capacity of 20 gallons per cOIUlection. eel For 50 to 250 cOIUlectiOns, the system must meet the following requirements: (i) A well capacity of 0.6 gallon per minute per cOIUlection must be provided. (ii) A tolal storage capacily 0[200 gallons peIcpnnection must be provided. (iii) Each pump station or pressure plane shall have two or more pumps having a tolal capacity of 2.0 gallons per minute per connection. For systems which provide an elevated storage capacily of 200 gallons per connection, two service pumps with a minimum combined capecily of 0.6 gallO/lS per minute per connection are required at each pump station or pressure plane. [fonly wells and elevated storage are provided, service pumps are not required. (iv) An elevated storage capacity of 100 gallons per connection or a pressure tank capacily of 20 gallons per connection must be provided. (D) For more than 250 connections, the system must meet the following requirements: (i) Two or more wells having a tolal capacity of 0.6 gallons per minute per connection must be pnrvided. Where an imett:onnection is provided with another acceptable water system capable ofsupplying at least 0.35 gallons per minute for each connection in the combined system under emergency conditions, an additional well will not be required as long as the 0.6 gallons per minute per connection requirement is met for each system on an individual basis. Each water system must still nteet the storage and pressure maintenance requirements on an individual basis unless the interconnection is permanently open; in this case, the systems' capacities will be rated as though a single single system existed. (ii) A tolal storage capacity 0[200 gallO/lS per connection must be provided. (iii) Each pump station or pressure plane shall have two or more pumps that have a tolal capacity of 2.0 gallons per ruinute per connection or that have a tolal capacity of at least 1,000 gallons per minute and the ability to meet peak hourly demands with the la:!gest pump out ofservice. Texas Natural ResolUCe Conservation Commission Page 39 Chapter 290 • Water Hygiene whichever is, less, For systems which provide an elevated storage capacity of 200 gallons per connection. two service pumps with a minimum combined capacity of 0.6 gallons per minute per connection are required at each pump station or pressure plane, Ifonly wells and elevated storage are provided. service pumps are not required, (iv) An elevated storage capacity of 100 gallons per connection or a pressure tank capacity of 20 gallons per connection must be provided. If pressure tanks are used, a maximum capacity of 30,000 gallons is sufficient for up to 2,500 connections. An elevated storage capacity of 100 gallons per connection is required for systems with more than 2,500 connections. Alternate methods of pressure maintenance may be proposed and will be approved ifthe criteria contained in §290A5(g)(2) of this chapter are met. (v) Emergency power is required for systems which serve more than 250 connections and do not meet the elevated storage requirement. Sufficient emergency power must be provided to deliver a minimum of 0,35 gallons per ntinute per connection to the distribution system in the event of the loss of normal power supply, Alternately, an emergency interconnection can be provided with another public water system that has emergency power and is able to supply at least 0.35 gallons per minUle for each connection in the combined system. Emergency power facilities in systems serving, 1000 connections or greater must be serviced and maintained in accordance with level 2 maintenance requirements contained in the current NFP A 110 standards, Although not required, compliance with NFP A II 0 standards is highly recommended for systems serving less than 1000 connections. Logs of all emergency power use and maintenance must be maintained and kept on me for a period of not less than 3 years. These recoids must be made available, upon request, for commission review. (E) Mobile home parlnal Office Immediately" A,900 persons or fewer. may collect all required samples on a single day if they are taken from different sites. (-» Special purpose samples. such as those taken to determine whether disinfection practices are sufficient following pipe placement, replacement, or repair, shall not be used to determine compliance with the MCL for microbiological contaminants. (b) Repeat monitoring. (1) If a routine sample is total coliform-positive, the public water system must collect a set of repeat samples within 24 hours of being notified of the positive result, or as soon as possible if the local laboratory is closed. (A) A system which collects more than one routine sample per month must collect no fewer than three repeat samples for each total coliform-positive sample found. (B) A system which collects one routine sample per month must collect no fewer than four repeat samples for each total coliform-positive sample found. (2) The system must collect at least one repeat sample from the sampling tap where the original total coliform-positive sample was taken, and at least one repeat sample at a tap within five service connections upstream and at least one repeat sample at a tap within five service connections downstream of the original sampling site. Ifa fourth repeat sample is required, it must be collected within five service connections upstream or downstream. If the positive routine sample was collected at the end of the distribution line, one repeat sample must be collected at that point and all other samples must be collected within five connections upstream of that point. (3) The system must collect all repeat samples on the same day, except that a system with a single service connection may collect daily repeat samples until the reqnired number of repeat samples has been collected. (4) 'Ifone or more repeat samples in the set is total coliform-positive, the public water system must collect an additional set of repeat samples in the manner specified in paragraphs (I)-(3) of this subsection. The additional samples must be collected within 24 hours of being notified of the positive result or as soon as possible ifthe local laboratory is closed. The system must repeat this process until either total coliforms are not detected in one complete set of repeat samples or the system determines that the MCL for total coliforms has been exceeded. (5) If a system collecting fewer than five routine samples per month has one or more total coliform-positive samples and the commission does not invalidate the sample(s) in accordance with subsection (c) of this section, it must collect at least flve routine samples during the next month the system provides water In the public. Texas Natural Resource Conservation Commission Page 13 Chapter 290 -Water Hygiene (6) After a system collects a routine sample and before it learns the results of the analysis of that sample. if it collects another routine sample(s) from within five adjacent service connections of the initial sample. and the initial sample. after analy sis, is found to contain total coliform bacteria, then the system may count the subsequent sample(s) as a repeat sample instead of as a routine sample. (7) Results of all routine and repeat samples not invalidated by the commission must be included in determining compliance with the MCL for total coliforms in accordance with §290.105 of this title (relating to Maximum Bacteriological Contaminant Levels (MCLs) for Microbiological Contaminants). (c) Invalidation of total coliform samples. (I l A total colifonn-positive sample invalidated under this subsection does not count towards meeting the minimum monitoring requirements of this section. (2) The commission may invalldate a total coliform-positive sample only if one of the following conditions is met: (Al the laboratOIY establishes that improper sample analysis caused the total coliform-positive result; (B) the commiSSiOn, on the basis of the results of repeat samples collected as required by this section, detennines that the total coliform-positive sample resulted from a domestic or other nondistribution system plumbing problem. The commission cannot invalidate a sample on the basis of repeat sample results unless all repeat sample(s) collected at the same tap as the original total coliform-positive sample are also total colifonn-positive, and all repeat samples collected within five service connections of the original.tap are total coHfonn-negative. Under those circumstances, the system may cease resampling and request that the commission invalidate the sample. The system must provide copies of the routine positive and all repeat samples; or (C) the commission has substantial grounds to believe that a total coliform-positive result is due to a circumstance or condition which does not reflect water quality in the distribution system. In this case., the system must still collect all repeat samples required by this section, and use them to determine compliance with the MCL for total coliforms in §290.105 of this title (relating to Maximum Contaminant Levels (MCLs) for Microbiological Contaminants). The system must provide written documentation which must state the specific cause of tile total coliform-positive sample, and what action the system has taken, or will take, to correct this problem. The commission may not invalidate a total colifonn-positive sample solely on the grounds that all repeat samples are total coliform-negative. (3) If a laboratory invalidates a sample, the system must collect another sample fro m the same location as the original sample within 24 hours of being notified, or as soon as possible if the labOIatory is closed, and have it analyzed for the presence of total coliforms. The system must continue to re-sample within 24 hours and have the samples analyzed until it obtains a valid result. Texas NatUlal Resource Conservation Commission Page 􀁉􀁾􀀠Chapter 290 -Water Hygiene (d) Fecal coliform bacteriafEscnericbja coli (E. colil testing. (I) [f any routine or repeat sample is total coliform-positive. that total coliform-positive culture medium will be analyzed to determine if fecal colifonns or E. coli bacteria are present. If fecal coliforms or E. coli are preseD!, tne system must notify the commission by the end of the day when the system is notified of tne test result. unless the system is notified of the result after the commission office is closed, in which case the system must notify the commission before tne end of the next business day. (e) Notification to the Texas Natural Resource Conservation Commission (TNRCC). (I) A public water system which has exceeded the MCL for total coliforms in §290.105 of tnis title (relating to Maximum Contaminant Levels for Microbiological Contaminants) must report the violation to the commission no later than the end of the next business day after it learns of the violation, and notify the public in accordance with §290.103(8) of this title (relating to Standards of Chemical Quality). (2) A public water system which has failed to comply with a coliform monitoring requirement must report the monitoring violation to the commission within ten days after the system discovers the violation, and notify the public in accordance with §290.103(8) of this title (relating to Standards of Chemical Quality). §290,l07. [Reserved for future use.1 §290.108. Inorganic Chemical Monitoring and Analytical Requirements. Community water systems and non-transient. non-community water systems shall conduct monitoring to determine compliance with the maximum contaminant levels specified in §290.103 of this title (relating to Standards of Chemical Quality). Transient, non-community water systems shall conduct monitoring to determine compliance with the nitrate and nitrite maximum contaminant levels in §290.103 of this title (relating to Standards of Chemical QUality) (as appropriate) in accordance with this section. (l) Monitoring locations for inorganic constituents other than asbestos shall be determined as follows: (A) Groundwater systems shall take a minimum of one sample at every entry point to the distribution system (hereafter called a sampling point). (B) Surface water systems and systems using a combination ofground water and surface water sources shall take a minimum of one sample at every entry point to the distribution system (hereafter called a sampling point). Texas Natural Resource Conservation Commission Page 15 Chapter 290 -Water Hygiene (Cl If a system draws water frpm more than one source and the sources are combined before distribution, the system must sample at an entry point to the distribution system during periods of normal operating conditions (i.e" when water is representative of all sources being used), (D) Systems shall take subsequent samples at the same sampling points unless conditions make another sampling point more representative of each source or treatment plant. (E) The commission may reduce the total number of samples which must be analyzed by allowing the use of compositing, Composite samples from a maximum of five sampling points are allowed, Compositing of samples must be done in the laboratory or in the field by commission staff. (i) If the concentration in the composite sample is greater than or equal to the proportional contribution of the MCL of any inorganic chemical, then a follow-up sample must be collected within 14 days from each sampling point included in the composite, (i.e., 20% of MCL when 5 points are composited). These samples must be analyzed for the comaminant(s) which were excessive in the composite sample. Detection limits for each analytical method are as listed in 40 Code Of Federal Regulations 141.23(a}(4)(i). (ii) Compositing may be permitted only at ground water sampling points within a single system. (iii) Ifduplicates of the original sample taken from each sampling point used in the composite are available, the system may use these instead of resampling. The duplicates must be analyzed within 14 days of the composite. (2) The frequency of monitoring to determine compliance with the MeL for asbestos specified in §290.103 of this title (relating to Standards of Chemical Quality) shall be as follows: (A) Each community and non-transient, non-community water system not receiving a waiver is required to monitor for asbestos during the first three-year compliance period of each nine-year compliance cycle beginning with the initial compliance period. (B) The commission may grant a waiver based on a considemtion of the following factors: (i) Potential for asbestos contamination of the water source, and (ii) The use of asbestos-cement pipe for finished water distribution and the corrosive nature of the water, (C) A waiver remains in effect Wltil the completion of the three-year compliance period. Texas Natural Resource Conservation Commission Page 16 Chapter 290 -Water Hygiene (D) A system vulnerable tQ asbestos contamination due solely to corrosion of asbestos-cement pipe shall take one sample at a tap served by asbestos-<:ement pipe, under conditions where asbestos contamination is most likely to occur. (E) A system vulnerable to asbestos contamination due solely to Source water shall monitor in accordance with the provisions of paragraph (I) of this section. (F) A system vulnerable to asbestos contamination due both to its source water supply and corrosion of asbestos-<:ement pipe shall take one sample at a tap served by asbestos-<:ement pipe, under conditions where asbestos contamination is most likely to occur (G) A system which exceeds the MCL for asbestos as determined in paragraph (9) of this section shall monitor quarterly beginning in the next quarter after the violation occurs. (H) The commission may decrease the quarterly monitoring requirement to the frequency specified in paragraph (2)(2)(A) of this section provided the commission has determined that the system is reliably and consistently below the maximum contaminant level.. [n no case can the commission make this determination unless a groundwater system takes a minimum of two quarterly samples and a surface (or combined surface/ground) water system takes a minimum of four quarterly samples. (I) [f monitoring data collected after January I, 1990 are generally consistent with the requirements of paragraph (2) of this section (relating to Standards of Chemical Quality), then the commission may allow systems to use that data to satisfy the monitoring requirement for the initial compliance period. (3) Monitoring conducted to determine compliance with the maximwn contaminant levels in §290.103 of this title (relating to Standards of Chemical Quality) for antimony, arsenic, barium, beryllium, cadmium, chromium, cyanide, fluoride, merclllY, nickel, selenium, and thallium shall be as follows: (A) Beginning in the initial compliance period, groundwater systems shall take one sample at each sampling point once every three years. Beginning in the initial compliance period, surface water systems (or combined surface/ground) shall take one sample annually at each sampling point. Each of the sampling frequencies listed in this paragraph constitute one round of sampling for groundwater and surface water systems, respectively. (B) The commission may grant waivers from the monitoring frequencies specified in subparagraph (3)(A) of this paragraph. The term during which the waiver is effective shall not exceed one compliance cycle (nine years). (C) A condition of the waiver shall be that a system must take a minimum of one sample while the waiver is effective. Texas Naturai Resource Conservation Commission Page 17 Chapter 290 -Water Hygiene (D) The commission may grant a waiver provided surface water systems have monitored annually for at least three years and groundwater systems have conducted a minimum of three rounds of monitoring. (At least one sample shall have been taken since January I. 1990.) Both surface and groundwater systems shall demonstrate that all previous analytical results were less than the MCL. Systems that use a new water source are not eligible for a waiver until three rounds of monitoring from the new source have been completed. (E) In determining the appropriate reduced monitoring frequency, the commission shall consider: (i) Reported contaminant concentrations from all previous monitoring; (ii) The degree of variation in reported concentrations; and (iii) Other factors which may affect contaminant concentrations such as changes in groundwater pumping rates, changes in the system's configuration, changes in the system's operating procedures, or changes in the flow or characteristics of a re.servoir or stream used as the water source. (F) If a decision by the commission is made to grant a waiver it shall be made in writing and shall set forth the basis for the determination. The determination may be initiated by the commission. The commission shall review and, where appropriate, revise the waiver of monitoring frequency when other data relevant to the system become available. (G) Systems which exceed the IOC MCL's as calculated in paragraph (9) of this section shall monitor quarterly beginning in the next quarter after the violation occurs. (H) The commission may decrease the quarterly monitoring requirement to the frequencies specified in subparagraphs (A) and (8) of this paragraph provided it has determined that the system is reliably and consistently below the MCL. In no case can the commission make this determination unless a groundwater system takes a minimum of two quarterly samples and a surface water system takes a minimum of four quarterly samples. (4) All public water systems (community; non-transient, non-community; and transient, non-community) shall monitor to determine compliance with the maximum contaminant level for nitrate as follows: (A) Community and non-transient, non-community water systems served by groundwater shall monitor annually beginning January I, 1993; systems served by surface water shall monitor quarterly beginning January I, 1993. (B) Each. transient non-community water system shall monitor annually beginning January I, 1993. Texas Natural Resource Conservation Commission Page 18 Chapter 290 -Water Hygiene (C) The repeat monitoring frequency for community and non-transient, non-community groundwater systems shall be quarterly for at least one year following anyone sample in which the concentrauon is 􀁾􀀠50 percent of the MCL. The commission may allow a groundwater system to reduce the sampling frequency to annually after four consecutive quarterly samples are reliably and consistently less than the MCL, (D) The commission may allow community and non-transient, non-communitv water systems to reduce the sampling frequency to annually if all analytical results from four . consecutive quarters are less than 50 percent of the MCL. A surface water system shall return to quarterly monitoring if anyone sample is greater than 50 percent of the MCL. (E) After the initial round of quarterly sampling for surface water systems is completed, any community or non-transient non-community system which is monitoring annually shall take subsequent subsequent samples during the quarter which previously resulted in the highest analytical result (5) Ail public water systems (community; non-trnnsient, non-community; and transient, non-community systems) shall monitor to determine compliance wi\ll the maximum contaminant level for nitrite as follows: (A) All public water systems shall take one sample at eacll sampling point during the initial compliance period. (B) After the initial sample, systems where the analytical result for nitrite is <50 percent of the MCL shall monitor at the frequency specified by the commission. (C) The repeat monitoring frequency for nitrite for all public water systems shall be quarterly for at least one year following anyone sample in which the concentration is 􀁾􀀵􀀰􀀠percent of the MCL. The commission may allow a system to reduce the sampling frequency to annual after determining the system is reliably and consistently less than the MeL. (0) Systems which are monitoring annually shall take each subsequent sample during the quarter which previously resulted in the highest analytical result. (6) Confirmation sampling: (A) Where the results of sampling for antimony, arsenic, asbestos, barium, beryllium, cadmium, chromium, cyanide, fluoride, mercury, nickel, selenium or thallium indicate an exceedance of the MCL, one additional sample from the same sampling point shull be collected as soon as possible after the initial sample. (B) Where nitrate or nitrite sampling results indicate an exceedance of the maximum contaminant level, the system shall take a confirmation sample within 24 hours of the system's receipt ofnotification of the analytical results of the first sample. Systems unable to comply with the 24-hour sampling requirement must immediately notify the consumers served by the public water system in accordance with §290.103(8)(A)(iii) of this title (relating to Standards of Chemical Texas Natural Resource Conservation Commission Page 19 Chapter 290 • Water Hvgiene Quality). Systems exercising this option must take and analyze a confinnation sample within two weeks of notification of the analytical results of the first sample. (C) If a commission-required continnation sample is taken for any contaminant. then the results of the initial and confinnation sample shall be averaged. The resulting average shall be used to detennine the system's compliance in accordance with paragraph (9) of this section. The commission has the discretion to delete results of obvious sampling errors. (7) The commission may require more frequent monitoring than specified in paragraphs (2}·(5) of this section or may require confinnation samples for positive and negative results at its discretion. (&) Systems may apply to the commission to conduct more frequent monitoring than the minimum monitoring frequencies specified in this section. (9) Compliance with §290.103 of this title (relating to Standards of Chemical Quality) (as appropriate) shall be detennined based on the analytical result(s) obtained .at each sampling point. (A) For systems which are conducting monitoring at a frequency greater than annual, compliance with the MCLs for antimony, arsenic, asbestos, barium, beryllium, cadmium, chromium, cyanide, fluoride, mercury, nickel, selenium and thallium is detennined by a running annual average at each sampling point. If the average at any sampling point is greater than the MCL, then the system is out of compliance. Ifanyone sample would cause the annual average to be exceeded, then the system is out of compliance immediately. Any sample below the method detection limit shall be calculated at zero for the purpose of detennining the annual average. (8) For systems which are monitoring annually, or Jess frequently, the system is out of compliance for antimony, arsenic, asbestos, barium, beryllium, cadmium, chromium, cyanide, fluoride, mercury, nickel, selenium and thallium if the level of a contaminant at any sampling point is greater than the MCL. If a continnation sample is required by the commission, the determination of compliance will be based on the average of the two samples. (C) Compliance with the MeLs for nitrate and nitrite is based on one sample if the levels of these contaminants are below the MCLs. Ifthe levels of nitrate or nitrite exceed the M CLs in any sample, a confirmation sample is required in accordance with paragraph (6)(8) of this section, and compliance shall be based on the average of the initial and continnation samples. (0) If a public water system has a distribution system separable from other parts ofthe distribution system with no interconnections, the commission may allow the system to give public notice to ouly the area served by that portion of the system which is out of compliance. (l0) Each public water system shall monitor at the time designated by the commission during each compliance period. Texas Natural Resource Conservation Commission Page 20 Chapter 290· Water Hygiene §290.109. Organic Chemical (Other Than Trihalomethanes) Monitoring, Analytical Requirements and Treatment Techniques. (a) Monitoring and analysis of the SOC contaminants listed in §290. !03(3)(A) of this title (relating to Standards of Chemical Quality) for the purposes of determining compliance with the maximum contaminant level shall be conducted as follows: (I) Groundwater systems shall take a minimum of one sample at every entry point to the distribution system which is representative of each well after treatment (hereafter called a sampling point). Each subsequent sample must be taken at the same sampling point uniess conditions make another sampling point more representative of each souree or treatment plant. (2) Surface water systems shall take a minimum of one sample at points in the distribution system that are representative of each source or at each entry point to the distribution system after treatment (hereafter called a sampling point). Each subsequent sample must be taken at the same sampling point uniess conditions make another sampling point more representative of each source or treatment plant. (3) If the system draws water from more than one SOUlCe and the sources are combined before distribution, the system must sample at an entry point to the distribution system during penods of normal opemting conditions (i.e., when water representative of all sources is being used). (4) Synthetic Organic Chemical (SOC) Monitoring Frequency: (A) Each community and non-tmnsient non-communiry water system shall take four consecutive quaner/y samples for each contaminant listed in §290.103(3)(A) of this title (relating Standards of Chemical Quality) during each compliance period beginning with the initial compliance period. (B) Systems serving more than 3,300 persons which do not detect a contaminant in the initial compliance period, may reduce the sampling frequency to a minimum of two consecutive quarterly samples in one year year during each repeat compliance period. (C) Systems serving less than or equal to 3,300 persons which do not detect a contaminant in the initial compliance period may reduce the sampling frequency to a minimum of one sample during each repeat compliance period. (5) The commission may grant a waiver from the requirement of paragraph (a)(4) of this section. after evaluating the following factors: Knowledge of previous use (including transpon. storage, or disposal) of the contaminant within the watershed or zone of influence of the water souree(s). Ifa determination by the commission reveals no previous use of the contaminant within the watershed or zone of influence, a waiver may be granted. If previous use of the contaminant is unknown or it has been used previously. then the following factors shall be used to determine whetller a waiver is granted: Texas Natural Resource Conservation Commission Page 21 Chapter 290 -Water Hygiene (A) previous analytical results; (B) the 􀁰􀁲􀁯􀀮􀁾􀁩􀁭􀁩􀁴􀁹􀀠of the system to a potential point or non-point source of contamination. Pomt sources include spills and leaks of chemicals at or near a water treatment facilitv or at drinking water sources. manufacturing, distribution, or storage facilities. or from hazardous and' municipal waste landfills and other waste handling or treatment facilities. Non-point sources include the use of pesticides to control insects. weeds, or pests on agricultural areas, forest lands. home and garden property, or other land application uses: (C) the environmental persistence and transport of the pesticide herbicide or co ntaminant. (D) how well the water source is protected against contamination due to such factors as depth of the well, type of soil and the integrity of well construction. Surface water systems must consider watershed vulnerability and protection; (E) elevated nitrate levels levels at the water supply source; ,and (F) use of PCBs in equipment used in the production, storage, or distribution of water (Le., PCBs used in pumps, transformers, etc.). (6) The commission will consider the waiver for each compliance period. (7) Ifan organic SOC contaminant listed in §290.103 (3) (A) of this title (relating to Standards of Chemical Quality) is detected, as defined in 40 CFR 141.24 (h) (18), in any sample, then: (A) The system must monitor quarterly at each sampling point at which a detection occurs, (B) The commission may decrease the quarterly monitoring reqnirement specified in subparagraph (A) of this paragraph provided it has detennined that the system is reliably and consistently below the MCL. [n no case shall the commission make this determination unless a groundwater system takes a minimum of two consecutive quarterly samples and a surface water system takes a minimum of four consecutive quarterly samples. (C) After the commission detennines that a system is reliably and consistently below the MeL, it may allow the system to monitor annually. Systems which monitor annually must monitor during the quarter that previously yielded the ltighest analytical result. (D) Systems which have three consecutive amrual samples with no detection of a contaminant be granted a waiver as specified in paragraph (6) ofthis subsection. (E) Ifmonitoring results in detection of one or more of certain related contaminants (aldicarb, aldie arb sulfone, aldicarb sulfoxide and heptachlor, heptachlor epoxide), then subsequent monitoring shall analyze for all related contaminants. Texas Natural Resource Conse,,·ation Commission Page 22 Chapter 290· Water Hygiene (8) Systems which violate the MCL's of §290.103(3)(A) of this title (relating to Standards of Chemical Quality) as determined by paragraph (a)(ll) of this section must monitor quarterly. After a minimum of four quarterly samples show the system is in compliance and the commission determines the system is reliably and consistently below the MCL, as specified in paragraph (aJ(ll) of this section, the system shall monitor at the frequency specified in paragraph (a){7)(C) of this section. (9) The commission may require a confirmation sample for positive or negative results. Ifa confirmation sample is required by tile commission, the result must be averaged wilh the first sampling result and the average used for the compliance determination as specifIed by paragraph (15) of this subsection. The commission has discretion to delete results of obvious sampling errors from this calculation. (10) The commission may reduce the total number of samples reqnired from a system for analysis by allowing the use of compositing. Composite samples ·from a maximum of five sampling points are allowed. Compositing of samples must be done in the laboratolY and analyzed within 14 days of sample collection. (A) If, in the composite sample, a detection of one or mOre SOC contaminants listed in §290.103(3){A) of this title (relating to Standards of Chemical Quality) occurs, then a follow-up sample must be taken from each sampling point included in the composite and analyzed within 14 days of collection. (B) If duplicates of tile original sample taken from each sampling point used in the composite are available, tile commission may use these duplicates instead of resampling. The duplicate must be analyzed within 14 days ofcollection and tile results reported to tile commission. (C) Compositing may oniy be permitted at sampling points within a single system. (II) Compliance with the MCL's of §290.103(3}(A) of this title (relating to Standards of Chemical Quality) shall be determined based on the analytical resnits obtained at each sampling point. (A) For systems which are conducting mOnitoring at a frequency greater than annual, compliance is determined by a running annual average of all samples taken at each sampling point. If the annual avemge ofany sampling point is greater than tile MCL, then tile system is out of compliance. If tile initial sample or a subsequent sample would cause tile annual average to be exceeded, tIlen the system is out of compliance immediately. Any samples below tile detection limit shall be calculated as zero for purposes of determining the annual avemge. (B) If monitoring is conducted annually, or less frequently, the system is out of compliance iftile level of a contaminant at any sampling point II; greater than the MCL. Ifa confirmation sample is required by the commission, the determination of compliance will be based on the average of the two samples. Texas Natural Resource Conservation Commission Page 23 Chapter 290 -Water Hygiene (C) If a public water system has a distribution system separable from other parts of the distribution system with no inten;onnections. the commission may allow the system to give publiC notice to only that portion of the system which is out of compliance. (12) If monitoring data collected after January I, 1990. are generally consistent with the requirements of subsection (a) of this section. then the commission may allow systems to use that data to satisfy the mortitoring requirement for the irtitial compliance period. (13) The commission may increase the required mortitoring frequency, where necessary, to detect variations within the system (e.g., fluctuations in concentration due to seasonal use, changes in water source, etc.). (14) The commission has the authority to determine compliance or irtiiiate enforcement action based upon analytical results and other information compiled by their sanctioned representatives and agencies. (15) Each public water system shall mortitor at the time designated by the comrrtission within each compliance period. (b) Beginrting with the irtitial compliance period: sampling and analysis of the VOC contaminants listed in §290J03 (3){B) of this title (relating to Standards of Chemical Quality), for the purpose of determirting compliance with the MCLs shall be conducted as follows: (I) Groundwater systems shall take a mirtimum of one sample at every entry point to the distribution system which is representative of each well after treatment (hereafter called a sampling point). Each subsequent sample must be taken at the Same sampling point nrtiess conditions make another sampling point more representative of each source or treatment plant. (2) Surface water systems (and combined su:rface/ground Waler systems) shall take a mirtimum of one sample at points in the distribution system that are representative of each source or at each entry point to the distribution system after treatment (hereafter called a sampling point). Each subsequent sample must be taken at the same sampling point unless conditions make another sampling point more representative of each source or treatment plant. (3) Ifthe system draws water from more than one sow:ce and the sources are combined before distribution, the system must sample at an entry point to the distribution system during periods of normal operating conditions (i.e., when water representative of all sources is being used). (4) Each commurtity and non-transient non-community water system shall take four consecutive quanerly samples for each contaminant listed in §290.103 (3)(B) of this title (relating to Standards of Cherrtical Quality) during each compliance period, beginrting with the irtitial compliance period. (5) Ifthe irtitial mortitoring for VOC contaminants listed in §290,l03 (3){B) of this title (relating to Standards of Chemical Quality) as allowed in paragraph (b)(16) has been completed by Texas Natural Resource Conservation Commission Page 2 .. Chapter 290 -Water Hygiene December 31, 1992, and the system did not detect any contaminant listed in §290, 103 (3)(B) of this title (relating to Standards of Chemical Quality) then each ground and surface water system shall take one sample annually beginning with the initial compliance period, (6) After a minimum of three years of annual sampling, the commission may allow groundwater systems with no previous detection of any contaminant listed for VOCs in §290,103 (3)(B) of this title (relating to Standards of Chemical Quality) to take one sample during each compliance period, (7) Each community and non-transient groundwater system which does not detect a contaminant listed in §290,I03(3)(B) of this title (relating to Standards of Chemical Quality) may be granted a waiver from the requirements of paragraphs (5) and (6) of this subsection aner completing the initial monitoring, (For the purposes of this section, detection is defined as ;,0,0005 mg!l.) l.) A waiver shall be effective for no more than six years (two compliance periods). (8) The commission may grant a waiver after evaluating the following factor(s): the knowledge of previous use (including transport, storage, or disposal) of the contaminant within the watershed or zone of influence of the water sources. If a determination by !lie commission reveals no previous use of the contaminant within the watershed or zone of influence, a waiver may be granted. If previous use of the contaminant is unknown or it has been used previously, then the following factors shall be used to determine whether a waiver is granted: (A) previous analytical results; (E) the proximity of the system to a potential point or non-point source of contamination. Point sources include spills and leaks ofchemicals at or near a water treatment facility or at drinking water sources manufacturing, distribution, or storage facilities, or from hazardous and municipal waste landfills and other waste handling or treatment facilities; (C) the environmental persistence and transP0It of the contaminants; (D) the nnmber of persons served by the public water system and the proximity ofa smaller system to a larger system; (E) how well the water source is protected against contamination (i.e., is it a surface or groundwater system). Groundwater systems must consider factors such as depth of the well, the type of soil, and well construction. Surface water systems must consider watershed protection. (9) As a condition of the waiver a groundwater system must take one sample at each sampling point during the time the waiver is effective (i.e., one sample during two compliance periods or six years) and update its vulnerability assessment conSidering the factors listed in paragraph (8) of this section. Based on this updated vulnerability assessment the commission must recoofirm that the system is not vulnerable. lfthe commission does not make tltis recoofirmation within three years of the initial detennination. then the waiver is invalid and the system is required to sample annually as specified in paragraph (5) of this section. Texas Natural Resource Conservation Commission Page 25 Chapter 290 -Water Hygiene (10) Each community and non-transient surface water system which does not detect a contaminant listed for VOCs in §290.103(3)(B) of this title (relating to Standards of Chemical QualilV) may be considered by the commission for a waiver from the requirements of paragraph (5) of this . subsection after completing the initial monitoring. Systems meeting this criteria must be determined by the commission to be non-vulnerable based on a vulnerability assessment during each compliance period. Each system receiving a waiver shall sample at the frequency specified by the commission (if any). (11) Ifa VOC contaminant listed in §290.103(3)(B) of this title (relating to Standards of Chemical Quality) is detected at a level exceeding 0.0005 mg/\ in any sample, then: (A) the system must monitor quarterly at each sampling point which resulted in a detection; (B) the commission may decrease the quarterly monitoring requirement specified in subparagrapb (A) of this paragraph provided it has determined that the system is reliably and consistently below the maximum contaminant level. In no case shall the commission make this determination unless a groundwater system takes a minimum of two quarterly samples and a surface water system takes a minimum of four quarterly samples; (C) ifthe commission determines that the system is reliably and consistently below the MCL, the commission may allow the system to monitor annually. Systems which monitor armually must monitor during the quarter which previously yielded the highest analytical result; (D) Systems which have three consecutive annual samples with no detection of a contaminant may be granted a waiver as specified in pamgraph (7) of tltis subsection. (E) groundwater systems which have detected one or more of the following two-carbon organic compounds: trichloroethylene, tetrachloroethylene, 1,2-dichloroethane, I, 1,1trichloroethane, cis-I ,2-dichloroethylene, trans-I,2-dichloroethylene. or I, I-dichloroethylene shall monitor quarterly for vinyl chloride. A vinyl chloride sample shall be taken at each sampling point at which one or more of the two-caroonorganic compounds was detected. If the result of the first analysis does not detect vinyl chloride, the commission may reduce the quarterly monitoring frequency for vinyl chloride to one sample during each compliance period. Surface water systems are required to monitor for vinyl chloride as specified by the commission. (12) Systems which violate the VOC MCL's of §290.103(3)(B) of this title (relating to Standards of Chemical Quality), as determined by paragraph (15) of this subsection, must monitor quarterly. After a minimum of four consecutive quarterly samples which show the system is in compliance as specified in pamgraph (15) of this section and the commission determines that the system is reliably and consistently below the maximum contaminant level, the system may monitor at the frequency and time specified in paragraph (11)(C) of this section. (13) The commission may require a confirmation sample for positive or negative results. [f a confirmation sample is reqnired by the commission, the result must be averaged with the Texas Natural Resource Conservation Commission Page 26 Chapter 290 • Water Hygiene first sampling result and the average is used for the compliance determination as specified by paragraph (15) of this section. The commission has discretion to delete results of obvious sampling errors from this calculation. (14) The commission may reduce the total number of samples a system must analne by allowing the use of compositing. Composite samples from a maximum of five sampling points'are allowed. Composiling of samples must be done in the laboratorv and analvzed within 14 davs of sample collection. '" (A) If the VOC concentration in the composite sample is 􀁾􀁏􀀮􀀰􀀰􀀰􀀵􀀠mg/I for any contaminant listed in §290. 103(3)(B) of this title (relating to Standards of Chemical Quality), then a follow-up sample must be taken and analyzed within 14 days from each sampling point included in the composite. (Bl If duplicates of the original sample taken from each sampling point used in the composite are available, the system may use these instead of resampling. The duplicate must be analyzed and the results reported to the commission within 14 days of collecti9n. (C) Compositing may onlY be permitted by the commission at sampling points within a single system. (D) Procedures for compositing VOC samples are as stated in 40 Code of Federal Regulations §141.24 (f)(14)(iv). (15) Compliance with §290. 103 (3)(B) of this title (relating to Standards of Chemical Quality) shall be determined based on the analytical results obtained at each sampling point. (A) For systems which are conducting mOnitoring at a frequency greater than annual, compliance is determined by a running annual average ofall samples taken at each sampling point. If the annual average of any sampling point is greater than the MCL, then the system is out of compliance. If the initial sample or a subsequent sample would cause the annual average to be exceeded, then the system is out ofcompliance immediately. (B) If monitoring is conducted annually, or less frequently, the system is out of compliance ifthe level ofa contaminant at any sampling point is greater than the MCL. If a confirmation sample is reqnired by the commission, the detennination of compliance will be based on the average of the two samples. (C) If a public water system has a distribution syslem separable from other parts of the distribution system with no interconnections, the commission may allow the system to give public notice 10 only thaI area served by tltat portion of the system which is out of compliance. (16) The commission may allow the use of monitoring data collected after January I. 1988 for purposes of initial monitoring compliance. Ifthe data are generally consistent with the other requirements in this section, the commission may use these data (i.e., a single sample rather than four Texas Natural Resource Conservation Commission Page 27 Chapter 290 -Water Hygiene quarterly samples) to satisfY the initial monitoring requirement of paragraph (4) of this subsection. Systems which use these samples and do not detect any contaminant listed in §290.103 (3)(B) of this title (relating to Standards of Chemical Quality) shalt begin monitoring annually in accordance with paragraph (5) of this subsection beginning Januruy I. 1993. (17) The commission may increase required monitoring where necessary to detect variations within the system. (18) Each public water system shall monitor at the time designated by the commission within each compliance period. (19) Analysis of unregulated contaminants shall be as specified in -10 Code of Federal Regulations (CFR) § 1-1 1.-10. The commission adopts by reference Federal Regulations referred to in this subsection. Copies are available for review in the Water Utilities DiviSion, Texas Natural Resource Conservation Commission. P. O. Box 13087 Austin. Texas 78711-3087. (c) Acrylamide and EpichJorohydrin Treatment Techniques. Each public water system must certity annually to the commission (using third party or manufacturer's certification) that when acrylamide or epichJorohydrin are used in drinking water systems, the combination (or product) of dose and monomer level does not exceed 0.05% dosed at 1 ppm (or equivalent) for acrylamide and 0.01 % dosed at 20 ppm (or equivalent) for epichJorohydrin. §2.90.110. Radiological Sampling and Analytical Requirements. (a) Maximum contaminant levels for radium-226, radium-228 and gross alpha panicle radioactivity for commurtity systems: , (1) Combined radium-226 and radiwn-228 -5 pCiIl (2) Gross alpha panicle activity (including radiwn-226 but excluding radon and uranium) -15 pCill. (b) Maximum contaminant levels for beta panicle and photon radioactivity from man-made radionuclides in drinking water in community water systems. (I) The average annual concentration of beta particle and photon radioactivity from man-made radio nuclides in drinking water shall not produce an annual dose equivalent to the total body or any internal organ greater than 4 millirem (mrem)fyear, (2) , Except for the radionuclides listed in Table A; the concentration of man-made radio nuclides causing 4 mrem total body or organ dose equivalents shall be calculated on the basis of a 2-liter-per-day drinking water intake using the 168 hour data listed in "Maximum Pennissible Body Burdens and Maximum Pennissible Concentration of Radionuclides in Air or Water for Occupational Exposure," NBS Handbook 69 as amended Augus" 1963, U,S. Department of Commerce. Iftwo or more radionuclides arc present, the sum of their annual dose equivalent to the total body or to any organ Texas Natural Resource Conservation Commission Page 28 Chapter 290 -Water Hygiene shall not exceed 􀁾􀀠mrem/year. Table A -Average annual concentrations assumed to produce a total body or organ dose of 􀁾􀀠mrem/year. Radionuclide Critical Organ pC, Per Liter Tritium Total Body 20,000 Strontium-90 Bone Marrow S (c) Monitoring frequency for radioactivity in community water systems. (1) Monitoring requirements for gross alpha particle activity, radium-226 and radium-l28. (A) Compliance with subsection (a) of this section shall be based on the analysis or analyses of four quarterly samples. (i) A gross alpha panicle activity measurement may be substituted for the required radium-226 and radium-228 analysis provided that the measured gross alpha particle activity does not exceed 5 pCiIlat a confidence level of 95 percent (1.65 0 where 0 is the standard deviation of the net counting rate of the sample.) (ii) When the gross alpha particle activity exceeds 5 pCiIl, the same or an equivalent sample shall be analyzed analyzed for radium-226. If the concentration ofradium-226 exceeds 3 pCiJl the same or an equivalent sample shall be analyzed for radium-228. (8) Suppliers of water shall monitor at least once every four years following the procedure required by subparagraph (Al of this paragraph. At the discretion of the commission, when an annual record taken in conformance with subparagraph (Al of this paragraph has established that the average annual concentration is less thao one-half the maximum contaminant levels established by subsection (a) of this section, analysis of a single sample may be substituted forthe quanerly sampling procedure required by subparagraph (Al of this paragraph. (i) More frequent monitoring shall be conducted when required by the commission in the vicinity of mining or other operations which may contribute alpha particle radioactivity to either surface or groundwater sources of drinking water, or when changes in the distribution system or treatment processing occur which may increase the concentration of radioactivity in the finished water. (ii) A supplier of water shall monitor in conformance with subparagraph (A) of this paragraph within one year of the introduction of new water source for a community water system. (iii) A community water system using two or more sources having different concentrations of radioactivity shall monitor the source of water, in addition to water from a free-flowing tap, when required by the commission. Texas Natural Resource Conservation Commission Page 29 Chapter 290 -Water Hygiene (iv) Monitoring for compliance with subsection (a) of this section after the initial period need not include radium-Z28 provided that the average concentration of radium-228 has been assayed at least once using the quanerly sampling procedure required by subparagraph (A) of this paragraph, (v) Suppliers of water shall conduct annual monitoring of any community water system in which the radium 226 concentration exceeds 3 pCUI when required by the commission, (C) If the average annual maximum contaminant level for gross alpha panicle activity or total radium as set forth in subsection (a) of this section is exceeded, the supplier of a community water system shall give notice to the commission and notify the public as required by §290.103(8) of this title (relating lD Standards of Chemical Quality). Monitoring at quanerly intervals shall be continued until the annual average concentration no longer exceeds the maximum contaminant contaminant level or until a monitoring schedule as a condition to a variance, exemption or enforcement action shall become effective. (2) Monitoring requirements for man-made radioactivity in'community water systems. (A) Systems using surface water sources and serving more than 100,000 persons and such other community water systems as are designated by the commission shall be monitored for compliance with subsection (b) of this section by analysis of four quarterly samples. Compliance with subsection (b) of this section may be assumed without further analysis ifthe average annual concentration of gross beta panicle activity is less than 50 peill and ifthe average annual concentrations of tritium and strontium-90 are less than those listed in Table A of subsection (b)(2) of this section, provided that ifboth radio nuclides are present, the sum of their annual dose eqnivalents to bone marrow shall not exceed 4 millirem/year. (i) If the gross beta, particle activity exceeds 50 pCi!I, an analysis of the sample sample must be performed to identify the major radioactive constituents present and the appropriate organ and total body doses shall be calculated to determine compliance with subsection (b) of this section. (ii) Suppliers of water shall conduct additional monitoring, as required by the commission to determine the concentration of man-made radioactivity in principal watersheds designated by the commission. (iii) At the discretion of the commission, suppliers of water utilizing only groundwaters may be reqnired to monitor for man-made radioactivity. (B) After the initial analysis reqnired by subparagraph (A) ofthis paragraph, suppliers of water shall monitor at least every four years following the procedure given in subparagraph (A) of this paragraph. Texas Natural Resource Conservation Commission Page 30 Chapter 290 -Water Hygiene (C) The supplier of any community water system designated by the commission as utilizing waters contaminated by effluents from nuclear facilities shall initiate quanerly monitoring for gross beta particle and iodine-131 radioactivity and annual monitoring for strontium-90and tritium. (i) Quanerly monitoring for gross beta particle activity shall be based on the analysis of monthly samples. If the gross beta particle activity in a sample exceeds 15 pCill. the same or an equivalent sample shall be analyzed for strontium-89 and cesium-IH. If the gross beta particle activity exceeds 50 pCiII_ an analySis oflhe sample must be performed to identify the major radioactive constituents present and the appropriate organ and total body doses shall be calculated to determine compliance with subsection (b) of this section. (ii) For iodine-131. a composite of five consecutive daily samples shall be analyzed once each quaner. When iodine-131 131 is identified in the finished water more frequent monitoring shall be conducted as required by the commission. (iii) Annual monitoring for strontium-90 and mtium shall be conducted by the analysis of four quanedy samples. . (iv) The commission may allow the substitution of environmental surveillance data taken in conjunction with a nuclear facility for direct monitoring of man-made radioactivity by the supplier of water where the commission determines such data is applicable to a panicular community water system. (D) If the average annual maximum contaminant level for man-made radioactivity set forth in subsection (b) of this section is exceeded, the operator of a community water system shall give notice to the commission and to the public as required by §190.I03(6) of this title (relating to Standards of Chemical Quality). Mortitoring at monthly intelVals shall be continued until the concentration no longer exceeds the maximum contaminant level or until a monitoring schedule as a condition to a variance, exemption or enforcement action shall become effective. §290.111. Construction and Siting Requiremellts. Construction features and sithtg of all facilities for new water systems, and for major improvements to existing water systems, must be in conformity with applicable rules and regulations. as promulgated by the Commission. §290.1l2. Recordkeeping and Reporting Required of Water Systems. Any owner or operator of a public water system subject to the provisions of this chapter shall retain on the water system premises or at a convenient location near the premises the following records: (I) Records of bacteriological analyses must be retained for no less than five years. and records of cbemical analyses must be retained for no less than ten years. Texas Natural Resource Conservation Commission Page 3 1 Chapter 290 -Water Hygiene (2) Records of action taken by the system to correct violations of primary drinking water regulations must be retained for at least three years after the last action taken with respect to the panicular violation involved. (3) Copies of written repons. summaries or communications relating to sanitary surveys of the system conducted by the system itself, by a private consultant, or by the commission shall be kept for a period not less than ten years after completion of the survey involved. (4) Records concerning a variance or exemption granted to the system shall be kept for a period ending not less than five years following the expiration of such variance or exemption. (5) Any owner or operator of a public water system subject to the provisions of this chapter is required to report to the State the results ofany test, measurement or analysis required to be made by these standards within ten days following such test, measurement or analysis. §29D.113. Secondary Constituent Levels. (a) The following secondary constituent levels are limits, applicable to all public water systems. No drinking water supply which does not meet the Secondary Constituent Levels may be used without written approval from the commission. CONTAMINANT LEVEL (mgll except where otherwise stated) Aluminum 0.05 to 0.2 Chloride 300 Color 15 color units Copper 1.0 Corrosivity Non-corrosive Fluoride 2.0 Foaming agents 0.5 Hydrogen sulfide 0.05 Iron 0.3 Manginese 0.05 Odor 3 Threshold Odor Number pH >7.0 Silver 0.1 Sulfate 300 Total Dissolved Solids 1,000 Zinc 5.0 (b) For all instances in which drinking water does not meet the recommended limits and is accepted for use by the commission, such acceptanCe is valid only until such time as water of acceptable chemical quality can be made available at reasonable cost to the area(s) in question. Texas Natural Resource Conservation Commission Page 32 Chapter 290 -Water Hygiene (e) Community water systems that exceed the secondary maximum constituent level for fluoride but are below the level listed in §290, 103 of this title (relating to Standards of Chemical Quality) must notify the public, The notice must be made annually by including it with the water bill or by separate mailing to all customers. The form and content of the notice shall be as prescribed by the commission. §290.114. Modified Monitoring. When a public water system supplies water to one or more other public water systems, lhe commission may modify the monitoring requirements imposed by this part to the extent that the interconnection of the systems justifies treating them as a single system for monitoring purposes, Any modified monitoring shall be conducted pursuant to a schedule specified by the commission in concurrence with the Administrator of the U.S, Environmental Protection Agency, §290.IIS. Exceptions to these Standards. These standards shall apply to each public water system, unless the pU,blic water system meets all of the following conditions: (I) consists only of distribution and slOIage facilities (and does not have any production and treatment facilities); (2) obtains aU ofits water from, but is not owned or operated by, a public water system to which such standards apply; (3) does not sell water to any person; 􀀨􀁾􀀩􀀠is nol a carrier which conveys passengers in interstate commerce; and (5) is subject to plumbing restrictions and inspections by the public water system which provides the water. §290.116. Control of Trihalometbanes in Drinking Water. (a) For the purpose of this section the following definitions will apply: (I) "Halogen" means one of the chemical elements chlorine, bromine, or iodine, (2) "Trihalomethane" (THM) means one of the family of organic compounds named as derivatives of methane, wherein three of the four hydrogen atoms in methane are each substituted by a halogen atom in the molecular structure. (3) "Total Trihalomethanes" (TTHM) means the sum of the concentration in milligrams per liter of the 􀁴􀁲􀁩􀁨􀁡􀁬􀁯􀁾􀁥􀁴􀁨􀁡􀁮􀁥􀀠compounds (trichloromethane, ie" chloroform; Texas Natural Resource Conservation Commission Page 33 Chapter 29() -Water Hygiene dibromochloromethane: bromodlchloromethane: tribromomethane, ie., bromoform) rounded to two significant figures. (.+) "Maximum Total Trihalomethane Potential" (MTP) means the maximum concentration of total trihalomethanes produced in a given water containing a disinfectant residual after seven days at a temperature of 25' C or above. (5) "Disinfectant" means any oxidant added to water in any pan of the treatment or distribution process, that is intended to kill or inactivate pathogenic microorganisms. (b) The maximum contaminant level (MeL) for total trihalomethanes shall be 0.10 milligramslliter. The MCL shall apply only to those systems which serve a population of 10,000 or more individuals. (c) Sampling and analytical requirements for total trillalomethanes: (I) For the purpose of this section, tile minimum number of 􀁳􀁾􀁭􀁰􀁬􀁥􀁳􀀠required to be taken shall be based on the number of treatment plants used by the system, except that multiple wells drawing raw water from a single aquifer shall be considered as one treaUllent plant for determining the minimum number of samples. All samples taken within one sampling period shall be collected within a 2-1-hour period. (2) For all community water systems utilizing surface water SOurces in whole or in part, and for all water systems utilizing only groundwater sources that have not been determined to qualify for the reduced monitoring requirements of paragraph (4) of this subsection, analyses for total trihalometllanes shall be performed on at least four samples of water per quaner from eac II treatment plant used by the system. At least 25 percent of the samples shall be taken at locations within the distribution system reflecting the maximum residence time of the water in the system. The remaining 75 percent shall be taken at representative locations in the distribution system, taking into account number of persons served, different sources of water, and different treaUllent methods employed. The results of all analyses per quarter shall be arithmetically averaged and reported to the commission within 30 days of the system's receipt of such results. All samples collected shall be used in computing the average, uniess the analytical results are invalidated for technical reasons. (3) Upon the written request of a community water system, the monitoring frequency required by paragrapll (2) of this subsection may be reduced by the commission to a minimum of one sample analyzed forTTHM's per quaner taken at a point in the distribution system reflecting the maximum residence time of the water in the system, upon a written determination by the commissio n that the data from at least one year of monitoring in accordance with paragraph (2) of this subsection and local conditions demonstrate that total trihalomethane concentrations will be consistently below the maximum contaminant level. (A) Ifat any time during which the reduced monitoring frequency prescribed under this subsection applies, the results from any analysis exceed 0.10 milligramslliter of TTHM's and such results are confirmed by at least one check sample taken promptly after such results are obtained, 􀁔􀁥􀀬􀀬􀁾􀁳􀀠Natuml Resource Conservation Commission Page 􀀳􀁾􀀠Chapter 290 -Water Hygiene or if the system makes any significant change to its source of water or treatment program, the system shall immediately begin monitoring in accordance with the requirements of paragraph (2) of this subsection. (8) Ifa system is required to begin monitoring in accordance with paragraph (2) of this subsection. such monitoring shall continue for at least one year before a reduction in monitOring frequency may be considered. (.J.) Upon the written request to the commission, a community water system utilizing only groundwater sources may seek to have the monitoring frequency reduced to a minimum of one sample for maximum TTHM potential per year taken at a point in the distribution system reflecting maximum residence time of the water in the system. The system shall submit to the Commission the results of at least one sample analyzed for ma.ximum TTHM potential taken at a point in the distribution system reflecting the maximum residence time of the water in the system. The system's monitoring frequency may only be reduced upon a written determination by the commission that, based upon the data subntitted by the system, the system has a maximum TTHM potential of less than 0.10 milligrams/liter and that, based upon an assessment of the local conditions of the system, the system is not likely to approach or exceed the maximum contaminant level for TTHM's: The results of all analyses shall be reporred to the commission within 30 days of the system's receipt of such results. All samples COllected shall be used for determining whether the system must comply with the monitoring requirements of paragraph (2) of this subsection, unless the analytical results are invalidated for technical reasons. (A) Ifat any time during which the reduced monitoring frequency prescribed under this subsection is in effect, the result from any analysis taken by the system for the maximum TTHM potential is equal to or greater than 0.10 milligramslliter, and such results are confirmed by at least one check sample taken promptly after such results are received, the system shall begin immediately to monitor in accordance with the requirements of paragraph (2) of this subsection. (8) If it becomes necessary to begin monitoring in accordance with paragraph (2) of this subsection, such monitoring shall continue for at least one year before the monitoring frequency may be reduced. (C) In the event of any significant change to the system's raw water or treattnent program, the system shall immediately analyze an additional sample for maximum TTHM potential taken at a point in the distribution system reflecting the maximum residence time of the water in the system for the purpose of determining whether the system must comply with the monitoring requirement of paragraph (2) of this subsection. (5) Compliance with the MCL of 0.10 milligramslliter for total trihalomethanes shall be determined based on a running annual average of quarterly samples collected by the system system as prescribed in paragraph (2) of this subsection. If the average of samples covering any 12-month period exceeds the maximum contaminant level, the supplier of water shall report to the commission within 30 days and notifY the public as required under §290.103(8) of this title (relating to Standards of Chemical Qnality). Monitoring after public notification shall be at a frequency designated by the commission Texas Natural Resource Conservation Commission Page 35 Chapter 290 • Water Hygiene and shall continue until a monitoring schedule as a condition of a variance, exemption, or enforcement action shall become effective. (6) Before a community water system makes any significant mOdification to its existing treatment process for the purpose of achieving compliance with this subsection, the system must submit and obtain commissio n approval of a detailed plan setting forth its proposed modifications and those safeguards that it will implement to ensure that the bacteriological quality of the drinking water served by such system will not be adversely affected by such modifications. (7) All analyses for determining compliance with the provisions of this subsection shall be conducted in accordance with the procedures required by the U.S. Environmental Protection Agency. §290.117. Disinfection. (a) A system that uses a surface water source must provide the disinfection treatment specified . in subsection (b) of this section beginning July I, 1993. A system that uses a groundwater source under the influence of surface water and provides filtration treatment must provide disinfection treatment as specified in subsection (b) of this section by July I, 1993, or beginning when filtration is installed, whichever is later. Failure to meet any requirement of this section after the applicable date specified in this subsection is a treatment technique violation. Violation of any treatment technique of this section must be reported to the comntission by the end of the next business day after the measurement was taken. (b) Each public water system that utilizes surface water or groundwater under the influence of surface water must provide disinfection treatment as follows. (I) The disinfection treatment must be sufficient to ensure that the total treatment processes of that system achieve at least 99.9 percent (3-log) inactivation and/or removal of Giardia lamblia cysts and at least 99.99 percent (4-log) inactivation and/or removal removal ofviruses, as determined by the commission. (A) The disinfectant concentrations(s) within the treatment process shall not be allowed to fall below acceptable levels for more than four hours. (B) Disinfection contact time will be based on tracer study data submitted by the system and approved by the commission. Acceptable tracer study data must be submitted to the commission no later than Januaty I, 1993. (2) The residual disinfectant concentration in the water entering the distribution system measured as specified in §290.119 of this title (relating to TuIbidity and Disinfection) shall not be less than 0.2 mgll free chlorine or 0.5 mgll chloramine for more than four hours. (3) The residual disinfectant concentration in the distribution system, as specified in §290.119 of this title (relating 10 Monitoring Requirements for Systems Using Surface Water Texas Natural Resource Conservation Commission Page 36 Chapter 290· Water Hygiene Treatment) shall not be less than 0,2 mg!1 free chlorine or less than 0,5 mg/l chloramine in more than five (5,0) percent of the samples each month, for any two consecutive months that the system serves water to the pUblic, Where: the value "V" in the following formula shall not exceed five (5,0) percent per month for any two consecutive months .b V = ••••-.---.---X 100 a WIlere: a = number of instances where the residual disinfectant concentration is measured; b = number of instances where the residual disinfectant concentration is measured but is detected at less than 0,2 mg!1 free chlorine or less than 0,5 mgll chloramine, §290.118. Filtration. A public water system that uses a surface water source must provide filtration treatment which complies with this section by July 1, 1993, A public water system that uses groundwater under the direct influence ofsurface water must provide filtration by a date specified by the commission. Such date will not exceed 18 months from the date of notification. Failure to meet any requirement of this section after the applicable date specified in this section is a treatment technique violation, Violation of any treatment technique requirement of this section must be reported to the commission by the end of the next business day after the measurement was taken. (I) For systems using conventional filtration or groundwater systems under the influence of surface water using direct nItration, the turbidity level of representative samples of a system's filtered water must be less than or equal to 0..5 Nephelometric Turbidity Unit (NTU) in at least 95 percent of the measurements taken each month, measured as specified in §290.119 of this title (relating to Mouitoring Requirements for Systems Using Surface Water Treatment); except that if the commission determines that the system is capable of achieving at least 99.9 percent removal and/or inactivation of Giardia lamblia cysts at some tumidity level higher than 0.5 NTU in at least 95 percent of the measurements taken each month, the commission may substitute this higher turbidity limit for that system. However, in no case may the commission approve a turbidity limit that allows more than one (1.0) NTU in more than fIVe (5.0) percent or the samples taken each month. (2) The tumidity level of representative samples of a system's filtered water must at no time exceed five (5.0) NTU. §290.119. Monitoring Requirements Relating to Turbidity and Disinfection for Systems Using Surface Water Treatment. A public water system that uses a surface water source or a ground water source under the influence of surface water must morulor in accordance with this section beginning July I, 1993. Texas Natural Resource Conservation Commission Page 37 Chapter 290· Water Hygiene (I) TUlbidity measurements as required by §290.1l8 or this title (relating to Filtration) must be perfonned on representative samples of the system's filtered water every four hours (or more frequently) that the system serves water to the public. A public water system may Substllute continuous turbidity monitoring for grab sample monitoring if it validates the continuous measurement for accuracy by calibrating on a weekly basis as a minimum frequency. Continuous monitoring results must be reported at equal intervals of four hours or less. For systems serving 500 or fewer persons. the system may reduce the rurbidity sampling frequency to once per day. (2) The residual disinfectant concentration of the water entering the distribution system must be monitored continuously, and the lowest value must be recorded each day. The system must also record rbe duration of the longest event when the residual leaving the plant fen below 0.2 0.2 mg/I flee chlorine or 0.5 mgll chloramine. Continuous disinfectant monitoring equipment muSI be calibrated at minimum frequency of monthly. If there is a failure in the continuous monitoring equipment, grab sampling every four hours may'be conducted in lieu of continuous mOnitoring, bul for no more than five working days following the failure ofth. equipment. Systems serving 3,300 or fewer persons may take grab samples in lieu of providing continuous monitoring on an ongoing basis at the frequencies each day as prescribed in the following chart. Systems which sell water on a wholesale basis shall monitor the disinfectant residual leaving the planl based on the total numbeI100,000 100 50 .. 10,00 I • 100,000 60 30 3,301· 10,000 􀁾􀁯􀀠20 501 -3,300 20 10 101 ·500 10 5 <101 5 5 (7) Initial tap sampling shall be conducted only after the Commission has determined that a system has successfully completed a materials survey and has obtained approval of its sample site selection form which is reqttired to be submitted by subsection (b)(2) of this section. Texas Natural Resource Conservation Commission Page 4Q Chapter 290 -Water Hygiene (8) The first six-month initial monitOring period begins on the dates listed in Table Number 2. Table No.2 SYSTEM SIZE (No. of People Served) FIRST SIX-MONTH MONITORING PERIODS BEGIN >50,000 Januarv 1. 1992 3.301 -50.000 July I, 1992 <3.301 July I. 1993 (d) Computing 90th Percentile Lead and Copper Levels -Determination of 90th pen::entile levels shall be obtained by ranking the results of lead and copper samples collected during a monitoring period in ascending order (lowest concentration =sample #1; highest concentration =sample #10, 20, 30. 40, 50, etc), up to the total number of samples collected. The number of-samples collected during the monitoring period shall be multiplied by 0.9 and the concentration of lead and copper in the numbered sample yielded by this calculation is the 90th pen::entile sample contaminant leyel. The system is in compliance with the lead andlor copper action leyels ifthe 90th percentile sample contaminant level is equal to or less than the action leyels specified in subsection (a)(2) of this section. For water systems serving fewer than 10 I people, the 90th percentile level is computed by taking the average of the highest two sample results. (eJ Reduced Tap Monitoring. (I) The commission shall notify each water system that it is eligible for reduced . monitoring of first draw tap samples ifit is in compliance with the 90th pen::entile lead and copper action levels after completion of two six-month periods of initial tap sampling. (2) Reduced monitoring shall be conducted annually during June, July, August, or September by collecting one set of samples from the appropriate number of reduced monitoring sites, after notification. (3) The number of reduced monitoring sites required for each system are found in Table Number I located in subsection (c)(6) of this section, ifnot otherwise specified by the commission. (4) Ifthe system exceeds an action leyel for lead or copper during any reduced monitoring monitoring period, then: (A) it must follow public education requirements applicable to action level exceedances during initial monitoring found in subsection (g) of this section; Texas Natural Resource Conservation Commission Page -II Chapter 290· Water Hygiene (B) collect the remaining number of samples as required for initial monitoring within 60 days. The results of all samples related to reduced monitoring will be used to determine action level exceedance. Should an exceedance of lead or copper action levels be verified. then procedures of this section applicable to action level exceedances during initial monitoring will be followed. (5) If after three annual periods of reduced monitoring the system continues to be in compliance with the lead and copper action levels, then the system will be notified to conduct reduced monitoring once every three years. (f) Monitoring Requirements for Water Quality Parameters (WQP's) and Source Water. (I) Water Quality Parameters. (A) All large water systems (serving populations greater than 50,000) are required to conduct WQP mOnitoring beginning with the initial period of first draw tap samples and continuing until corrosion control is optimized. (B) All medium and small systems (serving populations on,301 to 50,000 and less than 3,30 I, respectively) that exceed the lead or copper action level shall conduct WQP monitoring beginning in the first calendar quaner following the end of the period in which the exceedance of the lead andlor copper action level took place and continue as long as the system exceeds the lead or copper action level. (C) WQP monitoring shall be conducted quarterly for the following parameters: pH; alkalinity; calcium; conductivity; water temperature; orthophosphate (when an inhibitor contaiulng a phosphate compound is used) and silica (when an inhibitor containing a silicate compound is used). Temperature and pH must be measured at the sampling site at the same time of sample collection. (D) Large systems must conduct WQP monitoring at all entry points and at the number of distribution sites specified in Table Number 3 of this section. Small and medium systems that are required to-conduct WQP monitoring must monitor at all points of entry and at the required number of distribution sites as shown inthe Table Number 3. Texas Natural Resource Conservation Commission Page '>2 Chapter 290· Water Hygiene Table No.3 SYSTEM SIZE INITIAL WQP REDUCEDWQP NO. OF SITES FOR (# of people served) DISTRIBUTION DISTRIBUTION WQP MONITORING SITES SITES > 100.000 25 10 2S 10.001·100.000 10 7 10 3,30 I -10.000 3 3 3 50 I ·3 300 2 2 2 101 -500 I 1 I < 101 I I I (E) WQP distribution sites (exclusive of entry points) may be sites normally used for bacteriological monitoring and samples need not be collected inside the home. These sites shall be representative of water quality throughout the distribution system. (F) After corrosion control treatment is installed, water quality parameters shall be measured at the initial number of distribution sites as indicated in Table Number 3 quarterly and also at entry points biweekly. (0) WQP monitoring after corrosion control treatment is installed shall be conducted for the following parameters: pH, alkalinity, orthophosphate (when an inhibitor containing a phosphate compound is used), silica (when an inhibitor containing a silicate compound is used), and calcium (when calcium caroonate stabilization is used as part of the treatment). These parameters must be measured at all points of entry and initial distribution sites. (H) Any water system that maintains the range of values for WQP's reflecting optimum corrosion control as approved by the commission for one year may collect quarterly distribution samples at the reduced number of distribution sites indicated in Table Number 3. WQP samples shall continue to be measured at points of entry on a biweekly basis and results submitted to the commission. (I) Any water system that reflects optimal corrosion control treatment during tltree consecutive years may reduce the frequency at which it collects distribution samples for applicable WQP's to annually. (1) Any water system that reflects optimal corrosion control treatment during three consecutive years of annual WQP distribution monitoring may reduce the frequency at which it collects the number ofWQP distribution samples for applicable WQP's to once every three years. Texas Natural Resource Conservation Commission Page .. 3 Chapter 290· Water Hygiene (K) Water quality parameter testing must be conducted at a laboratory that uses the methods described in .. OCFR § 1 .. 1.89 and it is the responsibility of the water system (0 collect. submit and repon these values. If a water system fails to meet the WQP valuestranges specified by the Commission it is out of compliance with this section. WQP values may be verified by the system in accordance with .. 0 CFR §1 .. 1 ,82(g) of the federal regulations. The state requires that the values be reponed. but is not responsible for supplying sample boules and testing services to the water system. (L) Any water system subject to the reduced monitoring frequency that fails to operate within the approved range of WQP values shall resume distribution sampling in accordance with the number and frequency requirements in subparagraph (F) of this paragraph. (2) Entry Point Water Sampling. (A) Entry point water sampling for lead and copper shall be conducted by systems that exceed the lead or copper action levels in order to determine the lead or copper content of source water. Entry point water samples shall be collected in accordance with the requirements of this section regarding sample location, number of samples, and collection methods as specified in §290.108 of this title (relating to Inorganic Chemical MonitOring and Analytical Reqrdrements) except that one sample shall be collected from each entry point to the distribution system (no compositing) Within six months after notification of the exceedance of the lead andlor copper action level. If acceptable entry point water data is not available for large systems, the entry point water lead level shall be considered as zero for purposes of determining whether a corrosion control study is required. (B) The commission shall complete an evaluation of all entry point water sample results, along with the corrosion control study, to determine if source water treatment is necessaxy. If source water treatment is deemed necessary by the commission, the system must install it in accordance with the scheduling requirements specified in 40 CFR § 141.83(a) of the federal regulations. (C) Any system that installs entry point water treatment shall collect an additional round of source water samples as described above during two consecutive six-month periods within 36 months after source water treatment begins. (D) The monitoring frequency for lead and copper in source water, after the commission determines that source water treatment is not required, or after the commission has specified the maximum permissible source water levels for lead and copper, shall be in accordance with inorganic chemical monitoring practices and procedures as stated in §290.108 of this title. (E) Reduced source water monitoring procedures as specified in 40 CFR §141 .88( e) for lead and copper will be followed by the commission, Source water samples will be submitted by the water system in addition to other inorganic chemical monitoring requirements of these standards. (g) Public Education Procedures Texas Naruml Resource Conservation Commission Page 􀁾.. Chapter 290 • Water Hygiene (I) A water system that exceeds the lead action level based on first draw tap water sampling shall deliver to the public the public education materials as listed in 40 CFR § 1"1.85(a), in accordance with the requirements stated in paragraphs (2) and (3) of this subsection. (2) A community water system must. within 60 days of notification by the commission: (A) Insert notices in each customer's utility bill that includes the information in .. 0 CFR §141.85(a) and print the following alert on the water bill itself or on a bill insert in large print: "SOME HOMES IN THIS COMMUNITY HAVE ELEVATED LEAD LEVELS IN THEIR DRINKING WATER. LEAD CAN POSE A SIGNIFICANT RISK TO YOUR HEALTH. PLEASE READ THE ENCLOSED NOTICE FOR FURTHER INFORMATION." (B) Submit the required information in 40 CFR §141.85(a) to the editorial departments of the major local daily or weekly newspaper circulated throughout the system. (C) Deliver pamphlets andlor brochures that contain Ule public education materials as specified in 40 CFR §141.85(a)(2) and (4) to city or county health departments; to public schools or local school boards; Women, Infants and Children (WIC) andlor Head Slart Programs when available; public and private hospitals andlor clinics; pediatricians; family planning clinics; and local welfare agencies, within their service area. (D) Submit the public service announcement in 40 CFR §141.85(b) to at least five radio andlor television stations broadcasting to the area served by the water system. (E) A community water system must repeat the tasks contained in subparagraphs (A), (B), and (C) of this paragraph, every 12 montha and the tasks listed in subparagraph (D) paragraph, every six montlts for as long as the system exceeds the action level. (F) Certain requirements of subparagraphs (C) and (0) of this paragraph may be modified by the commission ifjustified by local circumstances. (3) A non-transient non-community waler system must within 60 days of notification by the commission, deliver the public education materials in 40 CFR §141.85(c)(4) as follows: (A) post informational posters on tead in drinking water in a public place or common area in each of the buildings served by the system, and (6) distribute pamphlets andlor brochures on lead in drinking water to each person served by the water system. (C) a non-transient non-community waler system must repeat the tasks contained in (3)(A) and (B) ohhis paragraph at least once during each calendar year in which the system exceeds the lead action level. Texas Natural Resource Conservation Commission Page .. 5 Chapter 290 -Water Hygiene (.I) A water system may discontinue delivery of public education materials if the system has met the lead action level during the most recent six-month mortitoring period. Such a system shall recommence public education in accordance with this section if it subsequently exceeds the lead action level during any mortitoring period. (5) A water system that fails to meet the lead action level as stated in subsection (a)(3) of this section shall make available to any customer who requests it. information as to how and where water samples may be submitted for lead and copper analysis. (h) Corrosion Control. (I) All applicable water systems shall install and operate optimal corrosion contrOl treatment; which means the corrosion control treatment that mirtimizes lead and copper concentrations at users' taps while insuring that the treatment does not cause the system to violate any other drinking water standard. (2) Large water systems (serving greater than 50,000 people) .are required to conduct corrosion contrOl studies unless they can demonstrate that corrosion contrOl Is already optimized to the satisfaction of the commission. If required to conduct a corrosion control study, a large system must complete it by July I, 1994, and the commission shall designate optimal corrosion contrOl treatment and parameters by January I, 1995. The system shall install corrosion control treatment by January I, 1997. Large systems that exceed lead andlor copper action levels must conduct a demonstration study as described in paragraph (4)(B) of this subsection. (3) Small and medium water systems (serving less than 3,301 or serving between 3.30 I and 50,000 people, respectively) are deemed to have optimized corrosion control ifthe system meets the lead and copper action levels during each of two consecutive six-month monitoring periods. These systems will be required to conduct a desk-top corrosion control study to optimize corrosion control if at anytime the 90th percentile action level for lead andlor copper is exceeded. The study must be conducted and submitted within 18 months after exceedance notification by the commission for medium sized water systems and within 24 months after exceedance notification for smaU water systems. (4) Perfonnance for Corrosion Control Studies. (A) Any public water system performing a corrosion contrOl study shall evaluate the effectiveness of each of the following treatments (or combinations of treatments) to identify the optimal control treatment; (i) alkalinity and pH adjustments; (ii) calcium hardness adjustment; (iii) addition of phosphate or silicate corrosion inhibitor. Texas Natural Resource Conservation Commission Page 􀁾􀀶􀀠Chapter 290 -Water Hygiene (B) The water system shall conduct this evaluation using either pipe rig/loop tests, metal coupon tests, panial systems rests (demonstration study), or analyses based on trearmems in documented analogous systems (desk-top study). Analogous system means a system of similar size, water chemistry, and distribution system configuration. (C) The water system shall measure the parameters listed in susbsection (f)(l)(C) of this section. (D) On the basis of the evaluation stated in subparagraph 􀀨􀁾􀀩􀀨􀁁􀀩􀀠and (B) of this paragraph, the water system shall recommend to the commission, in writing, the treatment option that constitutes optimum corrosion control/treatment along with sufficient documentation as required by the Slate to establish the validity of the evaluation procedure. Operational WQP ranges shall be proposed to the state where applicable. (E) The commission will, within six months after submittal of the corrosion control study by the water system, review the study and designate optimal corrosion control treatment and parameters. (F) The water system shall install optimal corrosion control treatment within 􀀲􀁾􀀠months after the commission designates optimal corrosion control treatment and notifies the system. (G) Large systems that install corrosion control treatment shall conduct firstdraw lead and copper tap sample monitoring as in initial monitoring during each of two consecutive six-month periods by January I, 1998. Small and medium systems sball complete the above stated monitoring within 36 months after the commission designates optimal corrosion control treatment. Small and medium systems are deemed to have optimized corrosion control if action levels for lead and copper are not exceeded in two rounds of subsequent lap sample monitoring. Large systems are deemed to have optimized corrosion control athey have demonstrated through first-draw tap monitoring conducted after treatment instalbtion and water quality pa1lUIleter sampling conducted in compliance with standards set by the commission for optimum corrosion control that they are operating within commission-designated parameters. (H) Any system that has installed corrosion control treatment and demonstrates optimal corrosion control and operates in compliance with the commission-designated optimal water quality parameters, may conduct reduced tap sampling as described in subsections (e)(I)-(5) of this section, when written permission is granted by the commission after the commission has evaluated all pertinent data. Systems that do not meet the action levels for lead and copper after installing corrosion contml treatment must continue to operate in accordance with WQP requirements established by the commission and follow procedures specified in subsection (e)(4) of this section. (I) The commission may modify, upon its own initiative or in response to a water system request or a request from interested parties, its designated corrosion control treatment or parameters. The request and commission response pursuant to modification shall be in writing. (5) Optimization of Corrosion Control Texas Natural Resource Conservation Commission Page 47 Chapter 290 • Water Hygiene (Al Any water system may be deemed by the commission to bave optimized corrosion control treatment if the system demonstrates, to the satisfaction of the commission, that it has conducted activities equivalent to the corrosion control steps listed in paragraph (4) of this subsection, (B) Any large water system is deemed to bave optimized corrosion control if it submits results of lead and copper tap water monitoring and entrY point water monitoring in accordance with this section which demonstrates for two consecutive six-month monitoring periods that the 90th percentile tap sample lead level is less than 0,005 mgll. (i) Lead Service Line Replacement (I) Systems that fail to meet the lead action level in first-draw tap sampling after installing corrosion control andlor source water treatment (whichever occurs last) shall immediately begin to replace annually 7 percent of the lead service lines identified during its materials survey process unless otherwise instructed by the commission. (2) Ifthe system is in violation for failure to install source wa.ter or corrosion control treatment, the commission may require the system to commenCe lead service line replacement after the date by which the system was required to conduct follow-up monitoring as specified in subsection (h)(4)(G) of this section. (3) The water system shall replace the entire service line (up to the building inlet) unless it demonstrates to the satisfaction of the commission in writing that it controls less than the entire service line. The written statement must indicate that the water system has none of the following forms of control over the service line: municipal ordinances, public service contracts or applicable legal authority, authority to set standards for construction, repair or maintenance, or ownership. In such a case, the system shall replace that portion of the lead service line that it controls and notify the owner that it will also replace the building owner's portion of the line. The system is not required to bear the cost of replacing the building owner's portion of the line. (4) Lead service line means a service line which is made all or in part of lead and connects the water main to the building inlet including any lead pigtall, gooseneck, or other fining . which is connected to such line. (5) The system may cease replacing lead service lines whenever subsequent 90th percentile first-draw-tap sampling in two consecutive monitoring periods is less than the lead action level. Lead service line replacement shall immediately resume if first-draw-tap samples exceed the 90th percentile lead actionllevel. (j) Analytical and Sample Preservation Methods. (1) Analysis for lead and copper shall be conducted using methods stated in 40 CFR §141.89, published in the June 7, 1991, Federal Register, in laboratories certified by the Texas Depanmem of Health Bureau of Laboratories. Analysis for pH, conductivity, calcium, alkalinity, or Texas Narural Resource Conservation Commission Page 􀁾􀀸􀀠Chapter 290 -Water Hygiene the phosphate. silica. and temperature may be conducted in any laboratory as long utilizing EPA methods prescribed in 􀁾􀁏􀀠CFR §H 1.89. (2) The Practical Quantitation Limits (PQL) and the Method Detection Limits (MDL) shall be as stated in 􀁾􀁯􀀠CFR 􀂧􀀱􀁾􀁌􀀸􀀹􀀮􀀠(3) The commission has the authority to allow the use of previously collected monitoring data if the data were collected in accordance with 􀁾􀁏􀀠CFR §141.89. (4) All lead levels measured between the PQL and the MDL must be reported as measured and all lead levels measured below the MDL must be reported as zero. (5) First-draw-tap samples must be received in the laboratory within 14 days after the collection dale along with correctly completed laboratory submission forms supplied by the commission. (6) Bottles supplied by the commission or the certified laboratory must be used for collecting the tap samples. (k) Reporting and Recordkeeping Requirements. (I) Reporting Requirements. (A) Repon all results of Water Quality Parameter (WQP) analyses including the location/address of each distribution system sampling point. This report must include each WQP specified in subsection (0 of this section. as well as all sample results from entry points to the distribution system. (B) Where applicable, the first draw tap monitoring shall be reponed within 10 days following the end of each monitoring period as specified by the commission. (Analysis results from the TDH laboIlltory are nonnaily provided simultaneously to the water system and the commission.) The water system's repon shall include an explanation as to why a sampling site was . changed from the previous round of sampling, if applicable. (C) As part ofthe site selection fonn, each water system shall justify the selection of sites other than Tier I sampling sites as defined on the site selection fonn and, if lead service lines are present, why the system was not able to locate a sufficient number to make up at least 50 percent of its required number of sampling sites. should this condition arise. (D) Where applicable, the system must certify that source water treatment has been installed as recommended by the commission and that installation was doue in accordance with the specified time requirements. Texas Natural Resource Conservation Commission Page .19 Chapter 290 • Water Hygiene (El Where applicable, the water system must cenify that lead service lines have been replaced in accordance with directives of the commission and in accordance with time schedules specified in subsection (i) of this section, (F) Where applicable, the water system must provide copies of public education materials and certification that distribution of said materials is being conducted in accordance with subsection (g) of this section, (G) When required by the commission, the system must repon any sampling data collected by th,e water system in addition to the items listed in subparagraphs (A)·(F) of this subsection, (H) Corrosion control treatment data shall be reponed as required by the commission for systems that: (i) have demonstrated optimum corrosion control; (ii) are required to specify optimum corrosion conuol Ueatment (as pan of the corrosion conual study); (iii) install corrosion conuol treatment as designated by the the commission, and (iv) are required to evaluate effectiveness of corrosion conuol ueatments, (2) Recordkeeping Requirements -Records of all sampling site data, sample submission forms, analysis results, repons, surveys, letters, evaluations, schedules, commission recommendations, requirements or determinations, and any other information deemed appropriate by the water system shall be retained by the water system for a miuimum of 12 years, These records include, but are not limited to, the following items: (A) tap water mouitoring results including the location of each site and date of collection; (B) cenification of the volume and validity of first-draw-tap sample criteria via a copy of the laboratory analysis request form; (C) where residents collected the sample, certification that the water system informed the resident of proper sampling procedures; (D) the analytical results for lead and copper concenttationS (provided to each system by the commission) at each tap sample site; (E) designation of any substitute site not used in previous monitoring periods, Texas }latural Resource Conservation Commission Page 50 Chapter 290 -Water Hygiene §290.12 I. Laboratory Analyses.