J /' /
, Council Agenda 􀁬􀁴􀁥􀁭􀀺􀁾􀁏􀀠SUMMARY: This item is to approve funding for work estimated to complete the Airport Fuel Farm Phase IT Environmental Assessment FINANCIAL IMPACT: Original
Council Authorization: $81,800 Additional Authorization Request: $14,900 Total Cost Including This Item: $96,700 Funding Source: Airport Fund BACKGROUND: Washington Group International
has completed the first four tasks of their original scope ofwork for the Airport Fuel Farm Phase IT Environmental Assessment. The work included a soil vapor survey, push probe soil
sampling, documents review, site recounaissance, persounel interviews, and report. This work was completed at a lump sum cost of$42,500. The results ofthis work were reported to Council
at a meeting on March 6, 2002. Washington's work showed areas ofhydrocarbon concentrations in the fuel farm area, but also showed migration ofhydrocarbons out oftheir study area, namely,
across Addison Road and to the west and northwest ofthe fuel farm. The attached proposal from Washington details the additional work that is estimated to complete the Phase IT Environmental
Assessment for the fuel farm. The work includes additional soil vapor sampling, soil borings, soil sampling and analysis, installation of monitoring weBs, and a final report with a presentation
ofresults to Council. This work is proposed for a Lump Sum of$54,200. The total cost ofthe project is now $96,700, and since $81,800 was authorized initially, an additional authorization
0[$14,900 is required. RECOMMENDATION: Staff recommends Council approve additional funding of$14,900 for this project and authorize the City Manager to accept Washington's Proposal dated
April 9, 2002 in the amount of$54,200. 
" Washington IndllSldaWIDCIISS Tuesday, April 09, 2002 WGI Proposal No. 80805-1 (Rev. 2 Addendum 2) QP&ES 01-EOOS Mr. James 􀁃􀁾􀀠Pierce, Jr.,P.E. Assistant Director of Public Works
Town of Addison P.O. Box 9010 Addison, Texas 75001-9010 PROPOSED SCOPE OF WORK FOR PHASE II ENVIRONMENTAL SITE ASSESSMENT ADDISON AIRPORT FUEL FARM ADDISON, TEXAS Dear Mr. Pierce: Presented
here is the Revision 2 Addendum 2 of our proposed scope of work for the Phase II Environmental Site Assessment of the fuel farm at Addison Airport in Addison, Texas. This addendum is
submitted in accordance with our conversations on March 20 and April 4, 2002,. and provides ao amended scope of work relE!tive. to· our, Revisiori 2 proposal, as approved by the Town
on December 31, 2001. .' . . Background The Town of Addison retained Washington Group Intemational to conduct a Phase II Environmental Site ASsessment. The approved scope of work included
six tasks separated into two parts, consisting of a soil vapor survey (Task 1), a pilot direct-push soil sampling program (Task 2), documents review (Task 3), and a mid-project status
report (Task 4) for the first part; and a soil and groundwater sampling and testing program (Task 5) with a final. report (Task 6) for the second part. Tasks 1 to 4 were completed between
the period of January to March 2002, and the results were presented to the Town Council on March 6, 2002. The results indicated that hydrocafbons have been released into the subsurface
in the fuel storage areas and extend off site beneath Addison Road to the east, and to the west and north toward the T-hangars and closed dispenser island, respectively. Both soil ..,
. and groundwater have been affected by the hydrOcarbons. In par:tiCI,J!ar, soil hydrocarbon concentrations exceed TNRCC Action Limits, the levels at which TNRCC requires further investigation
and/or remediation. . The results of Task 1 through Task 4 indicated that Tasks 5 and 6 must be completed to delineate the vertical and horizontal extent of contamination. This addendum
addendum presents our proposed scope of work for final delineation. It is expanded relative to the scope presented in the Revision 2 proposal of December 13, 2001, based on findings
of Tasks 1 to 4. 􀁾􀀳􀀱􀀼􀁩􀀱􀁢􀁹DriVe. HcuslDn,TX 77054 • P.O. !!ox 1281 _.TX mS1·1281 Phon.: (713)85UOOO 0 Fa>c (713) 383-lI149 • WMV.wginlcclm 
Mr. James Pierce, Jr., P. E. Tuesday, April 09, 2002 Page 2 Scope ofWork This revised scope of work consists of three tasks that are foilow-on from the previous four tasks and thus maintain
numerical. sequencing. It is oUr opinion' that the scope outlined below cannot be reduced further without seiiously jeopardizing the teChnical integrity of the program. Tasks 5 to 7
are related to additional data gathering activities to further quantify the lateral extent and magnitude of contamination in the soil and groundwater. The tasks detailed below will be
managed by a TNRCC-registered Corrective Action Project Manager under the employ of Washington. Washington is a Registered Corrective Action Specialist. The tasks will be conducted in
accordance with the current project-specific Health and Safety Plan (HSP). Task 5 -Soil Vapor Survey. Washington will oversee the execution of a soil vapor survey that will establish
the horizontal boundary conditions of soil hydrocarbon vapors that could not be established during the previous survey. We will retain the services of Exploration Technologies, Inc.,
(ETI) to conduct the survey. ETI conducted the previous soil vapor survey at the airport. The work plan includes the collection, over a 3-c1ay period, of up to 44 soil vapor samples
on a grid specing containing approximately 60 feet between sampling locations. The number of samples required to evaluate the area on this grid spacing is based on the attached map.
We believe 44 locations is the minirnalnumberthat will be necessary to encompass the existing soil vapor plume on the 6O-ftspacing. It is very conceivable that' more than 44 locations
will be necessary to establish the full horizontal extent of the soil vapor plume. Because we do not know how many additional locations may be necessary, we have priced the program to
include only the 44 locations but have also included a unit price for the field crew daily rate and a unit price for each additional soil vapor analysis. If additional locations appear
necessary, a fourth day of sampling would be required. The locations of individual samples may be adjusted in the. field during field operations to allow for buildings, piping, utility
chases, etc. The proposed locations of the soil vapor samples are on the airport property and off site east of the Addison Road right-ofway (ROW). Basad upon the results of this survey,
infill (higher density)" or 'expanded grid sampling can be performed in anomalous parts of the study area (if required to better delineate. the plume(s»; costs have not been included
for infi.l1 or expanded grid sampling and would only be conducted with. Town approvai. For sampling east of the Addison Road . ROW or other properties, we would require Town permission
arid/or assistance gaining access for sampling those locations. Vapor samples will be analyzed (screened) in the field during sample collection for methane, carbon dioxide, and oxygen
using an infrared gas analyzer. The results of these analyses will aid the field crew in adjusting the sampling grid (if necessary) and determining the location(s) of possible "hot spots"
during sample collection. All soil vapor samples will be analyzed in ETl's Houston, Texas laboratory utilizing standard QAlQC procedures. Samples will be analyzed for C1-C4 (methane,
ethane, propane, and butanes) and C5+ (pentane-xylenes+) hydrocarbons using two flame 
Mr. James Pierce, Jr., P.E. Tuesday, Apnl 09,2002 Page 3 ionization detector (FID) gas chromatographs. The FID gas chromatograph utilized for C5+ hydrocarbon analyses contains a capillary
column, allowing for high resolution (and separation) of individual compounds (such as BTEX, etc.) and identification of specific product signatures, Our project price does not include
the additional cost for the high'resolution capillary analysesJinterpretation;however, the chromatograms will be archived in . the event specific samples require additional review at
a later date, Results of the C1-C4 and C5+analyses will be tabulated and presented in parts per million by volume (ppmv). ETI will prepare a report including tabulated data, colored
plume maps for the various hydrocarbonlbiogenic gas constituents, and an interpretation of the data/maps. The work program will require up to four field days. Washington personnel will
coordinate with the Town for clearing and marking all utilities and obtaining permission to collect collect samples on properties and/or right-of-ways included in the survey area (if
applicable) prior to the commencement of field activities. Task 6 -Soil Borings and Monitoring Well Installation. This program does not take into account assessing the potential extent
of contamination, if present, in· the. underlying bedrock formation. This information gathered from this task would be combined with the horizontal boundary data from the soil vapor
survey to define the lateral extent of contamination and to evaluate the vertical extent of contamination. The preferred method for the collection of soil samples is direct push drilling.
This program is developed on the assumption that the subsurface stratigraphy will be conducive to this method .. Based on the earlier sampling conducted this appears tobea .suitable
method for soil sampling. Six (6) direct push borings will be strategically located based on the results of the completed soil vapor survey. As in the previous boring task, soil samples
will be collected and logged continuously to a maximum depth of 25 feet or until bedrock refusal. We will document soil type, groundwater, evidence of contamination, and other pertinent
informatiori on soil boring logs and a field notebook. ' TNRCC guidance for risk-based assessments conducted at underground tank sites requires that discrete soil samples be collected
in the source area at intervals of 0 to 2 ft, 2 ftto 15 ft, and 15 ft to total depth. Outside the source area soil sarriplesmuSt be collected to define the horizontal and vertical extent
of contamination within the zone of greatest contamination, immediately above the saturated .zone, and at total depth. Based on the proposed depth of soils available for sampling and
the scarcity of perched groundwater, this should be accomplished by collectirig tWo soil samples from each boring location; our proposal is priced accordingly, Within the identified
source areas soil samples 'will be collected at the zero to 2. ft depth interval and at the depth of greatest organic organic vapor response. At other locations the soils samples will
be collected at the interval of greatest organic vapor response and at total depth of the boring. If during sampling it is found that soil samples can be collected below a depth of 15
ft, we will collect soil samples in accordance with TNRCC guidance; a unit price for additional analYSis is included at the end of this proposed scope of work. Two soil samples will
be selected from each boring location for BTEX (Method 8260) and TPH (Method 1005) analyses, The soil sample showing the greatest organic vapor 
•• --------.. 􀁾􀀠••• • -< • Mr. James Pierce, Jr., P.E. Tuesday, April 09, 2002 Page 4 response in the field from each boring location will be selected for polyaromatic hydrocarbon
(PAH) analysis (Method 8270). The soil samples will be placed in laboratory-cleaned glass jars with appropriate labels and then placed in an ice-filled chest for-transport to our. iaboratory.
Chain-ofcustody documents will acCOmpany the samples. All sample handling equipment will be decontaminated between soil sample intervals. After boring completion, the boring will be
grouted with cement, bentonite, or other acceptable material to inhibit stratigraphie cross contamination. Drilling and sampling wastes will be collected in drums for later characterization
testing and disposal by others. If groundwater is encountered, we will install and sample up to four (4) monitOring wells to bedrock refusal, or a maximum depth of 25 feet. Hollow-stem
auger techniques will be required for monitoring well installation. The locations will be determined using the soil vapor data and the soil boring data to optimize· the locations, taking
into account hydrogeologic and contamination considerations. Actual depths will be determined in the field based on stratigraphy and the depths of-hydrocarbon-impacted. zones. We will
construct the wells with 2-in. 10, flush-joint-threaded, Schedule 40 PVC, usingO.Q1O-in. slotted casing. Filter pack sand wili be placed around the well screen, followed by a bentonite
seal and grouted to surface. The wells_will be flush-mounted relative to ground surface with a protective, locked cover. We will develop the wells to remove cuttings and sediments that
could affect hydraulic ciommunication between the well screen and the formation fluids. •. ..... ...... .. ---_ _ .. -. . .... ... . -.. _ . After well -development, we will purge the
wells of stagnant water and collect groundwater samples for analytical testing. Groundwater collected from the monitoring wells will be analyzed for BTEX, TPH, and PAH. We will place
groundwater samples in laboratory-cleaned glass jars with appropriate labels and place them in an ice-filled chest for transport to our laboratory. One method blank, a duplicate, and
a trip blank to evaluate cross contamination will be included with each sample lot for QA/QC control. Chain-ofcustody documents will accompany the samples. Sample handling-eqUipment
will be decontaminated between wells. Sampling wastes will be collected in drums for later characterization testing and disposal by others. This program does not include sampling and
analysis of groundwater from the existing monitoring wells. . Upon completion of soil boring and monitoring well installation we will retain a Registered Public Land Surveyor (RPLS)
to locate all the newly-installed wells and bOrings, .. The survey will provide an elevation relative to a local benchmark to provide accurate vertical and horizontal control data that
will be necessary for subsequent hydrogeologie characterization. -The RPLS will provide a digitized drawing and electronic file in AutoCAD for use in our reports. Task 7 -Final Report
and Recommendations. We will develop a report using TNRCC standardized forms, where required, that are mandatory under their LPST program. These reports include field activity reports,
well monitoring reports, site investigation reports, correspondence forms, and others, as appropriate. The final report will incorporate all the data collected from the earlier tasks
and include a recommendation directed toward natural attenuation as the preferred remedial alternative. We will also 
Mr. James Pierce, Jr., P.E. Tuesday, April 09, 2002 PageS include in the report an estimated cost, +1-30% to 40%, on what the Town could expect for bringing the site to closure under
a natural attenuation scenario. However, it is our experience that the TNRCC may require a<tlitional information before agreeing to a natural attenuation alternative, including a receptor
survey, soil properties testing,a utilities vapor survey, a water well inventory, etc., which have not been included in this scope of.work. We have made provision for the Washington
Project Manager to present to the Town Coundl the findings of the study. Schedule Upon receipt of both a signed Work Authorization and Notice to Proceed (NTP), we will begin preparations
to mobilize to the site to begin Tasks 5 to 7. We will complete the fieldwork for Tasks 5 and 6 within four weeks of notification, followed by another two weeks to allow for analytical
testing. Task 7 will be completed four weeks after receipt of the analytical test results, for a total duration of about ten weeks. This section presents: (1) a Lump Sum price for Tasks
5 through 7, work that we have confidence has a very well defined scope and (2), Time and Materials prices for any additional work that may be required. The Lump Sum price to conduct
Task 5 through Task 7 as one program is $54,200. This price includes provisions for a Final Presentation to the Town Council conducted by the WaShington Project Manager. The Lump Sum
price has been developed based on the follOwing assumptions: 1. Washington-Staubach, the Town's airport management agent, will provide. unrestricted access to Fuel Areas and will provide
notification to tank operators of our intent to conduct work in those areas. 2. Town will make a good faith effort to identify locations of their buried utility lines. Washington-Staubach
will make a good faith effort to identify other utility lines or other buried objects in the Fuel Areas for Washington. It is common for the identification of buried utilities arid ()bje.cts.
to take_ many. days. by the time perSonnel, . eqUipment, -maps, and the field visit are completed. '. Because of this, it is critical to our schedule that all entities identify their
known buried utilities before mobilization. Provisions have been made to use geophysics to identify .• unknown buried objects. . 3. Prices inClude costs related to routine project meetings,
discussions, and meetings with the Town but not withTNRCC or other third parties. No public notification costs have been included. The prices include a reasonable timeframe for progressive
completion of the tasks without extensive delays between tasks beyond the control ofWashington. 4. Prices have been developed on standard 8-hour workdays, 40-hour weeks, assuming normal,
nationally recognized holidays with no provision for overtime or weather delays. 
Mr. James Pierce, Jr., P. E. Tuesday, Apnl 09,2002 Page 6 5. Subsurface conditions do not indicate the need for drilling, sampling, or well installation by methods other than direct
push or hollow-stem auger. 6. Prices do not. include soil cutting and well development fluid wastes profiling and/or disposal.' . Table 1 presents the rates that would be in place for
any additional work that may prove necessary beyond the scope of work presented here. Such work would not be conducted without prior approval of the Town. . Table 2 􀁰􀁲􀁥􀁳􀁥􀁾􀁴􀁳􀀠unit
rates for additi9l1al Task 5 sOil vapor sampling . .Ta_bl.e$;:\ aOd4 present.unit rates for Task 6 push.probe boring-and manitoring wells, and analytical costs for the proposed program,
respectively. Hollow-Stem Auger Boring, 25-ft depth $22/ft (25 ft minimum) Direct Push Boring $1700/day Monitoring Well. 25-ft depth. 2-In. ID PVC $4Oift (25 ft minimum) 
Mr. James Pierce, Jr., P.E. 􀁔􀁵􀁥􀁳􀁤􀁡􀁾􀁁􀁰􀁲􀁩􀁉􀀰􀀹􀀬􀀲􀀰􀀰􀀲􀀠Page 7 SoillWater Total Petroleum . Hydrocarbons (TPH) Polynuclear Aromatic Benzene, Toluene, Ethylbenzene, Xylene
(BTEX) TNRCC1005 $75 . EPA 8270 $140. EPA 8020 or 8260 $45. Scope of Work Acceptance If you accept this scope of work, please sign below or forward us a signed Purchase Order or similar
authorizing document that references this Scope of Work. Closing Remarks We are pleased to have this opportunity to serve the Town of Addison and to demonstrate our breadth of capabilities.
We look forward to working with you. Sincerely, WASHINGTON GRoUp INTERNATIONAL TNRCC RCAS 00169.Pad 􀁾􀁾􀀮􀀠Paul R. Wild Manager of Environmental Services TNRCC CAPM00385 􀁁􀁣􀁣􀁥􀁾􀁥􀁤􀁂􀁹􀀺􀀠__􀁾􀁾
􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾􀁾____􀁾__ . Rob Whitehead, City Manager Date: Attachments: Soil Vapor Sample Location 
DATE JOB NO_ ATTENTION RE: ADDIsoN Public Works I Engineering 16801 Wes!grave· P.O. Box 9010 Addison, Texas 75001 Telephone: (9721 450-2871 • Fox: (9721 450-2837 GENTLEMAN: WE ARE SENDING
YOU 􀁾􀁴􀁴􀁡􀁣􀁨􀁥􀁤􀀠oUnder separate cover via ______the following items: oShop Drawings o Prints o Plans 0 Samples 0 Specifications 0 ________________ o Copy of letter oChange order
COPIES DATE NO. A DESCRIPTION /, 1---+----1---+---------------------------------1 THESE ARE TRANSMITTED as checked below: o For approval 0 Approved as submitted oResubmit 􀁾􀁾__copies
for approval p(For your use 0 Approved as noted o Submit copies for distribution o As requested 0 Returned for corrections oReturn corrected prints o For review and comment 0 _____________􀁾􀁾􀁾􀁾􀁾_
__􀁾􀁾􀁾􀁾􀁾􀁟􀀠o FOR BIDS DUE __________1v___ oPRINTS RETURNED AFTER LOAN TO US 􀁃􀁏􀁐􀁙􀁔􀁏􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀀭􀁓􀀭􀁉􀁇􀀭􀁎􀀭􀁅􀁄􀀺􀁾􀁾􀀭􀀭􀁾􀁾􀀭If enclosures
are not as noted, please no -
Washington Group IntI. File # 96167 Collection Center Drive Chicago, I L 60693 Washington Group Int'l. Inc ADDISON (Town of), TX 16801 Westgrove Road JOB NO. 25361 Addison, TX 75001·5190
ATTN: Mr. Jim Pierce DATE 8·Apr·02 INVOICE NO. 1054551 INQUIRIES 713·852·3019 TO INSURE PROPER CREDIT SEND YOUR REMITTANCE TO FILE # 96167, COLLECTION CENTER DRIVE, CHICAGO, IL 60693
FOR WIRE TRANSFER TO BANK OF AMERICA ABA #121000358 FOR CREDIT TO WGI ACCOUNT NO. 1233007378 PERIOD -FEBRUARY 9 through MARCH 22, 2002 SERVICES RENDERED DURING THE ABOVE PERIOD IN CONNECTION
WITH TASKS 1 TO 4 AND SUPPLEMENTAL CONSULTATION SERVICES FOR PHASE 2 ENVIRONMENTAL SITE ASSESSMENT, ADDISON AIRPORT FUEL FARM $32,400.00 $0.00 PROFESSIONAL SERVICES EXPENSES TOTAL $32,400.00
Budget: $52,400.00 This Invoice: $32,400.00 Previous Invoices: $20,000,00 Remaining: $0 
Mark Acevedo From: paul.wild@wginl.comSent: Wednesday, April 03, 2002 8:36 AM To: Macevedo@Ci. Addison. Tx. Us Subject: Proposal Revision 2 Addendum Mark, thanks for discussing the proposal
with me yesterday. As I stated yesterday, the additional-$26k in costs above the original budget estimate '. . . . for the second part of the investigation is primarily related to the
need for the completion of the soil vapor program by ETI. Some additional minor costs are related to some modifications in the analytical testing program, some additional research into
TNRCC archives, and a final project closeout meeting to present the results to you, Jim, Chris, and Ron. The additional funds are roughly what Ron Bowlin had "guesstimated" during the
March 20 phone call with Jim and Sam. It was our understanding from our meetings with the Town that the completion of the soil vapor survey was a priority to delineate the horizontal
extent of contamination, particularly across Addison Road. EVen if the Town had not requested it, I would have been remiss if I had not made provision for the horizontal delineation
because the State will certainly require it. It is not my desire to bulk up the project scope for a short-term monetary gain; rather, my intent is to develop a long-term relationship
with the Town that will last long afer lam no longer directly involved with the airport tank project. It is not only my intent but the intent also of my colleagues. Therefore, I believe
we have put together a very technically sound and cost effective program designed to get to the heart of the matter, i.e. an understanding of the extent and magnitude of the subsurface
contamination at the airport. In reference to your meeting this afternoon, I will be very happy to participate by phone if you so choose. I look forward to hearing from you. Paul 1 
Budget: $85,000 Original Proposal Tasks 1-6 $81,800 • Tasks 1-4 Completed (halfway point) $42,500 • Upon completion oftasks 1-4 -determined that 5-6 would have to be revised to include
soil vapor survey. • Tasks 5-6 were estimated at $39,300 • $42,500 $39,300 (not done) $81,800 Supplemental Proposal (3) Tasks $9,900 • Council Presentation • Regulatory Analysis ofTNRCC
regulations • Cost Estimates for construction ofa new fuel farm & costs to upgrade and keep present furm Update of Original Proposal Tasks 5-8 $65,500 • Perform tasks 5-6 from original
proposal • Include a Soil Vapor Survey as discussed at the stafftecbnical meeting 2120/02 $26,200. • $39,300 (from orig. proposal) $26,200 $65,500 Phase n Project Supplemental Services
$42,500 $9,900 $65,500 $108,000 $81.800 Original Prop. $26,200 Additional funding 
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m 􀁾􀀠.:,., ...., ,'" "":-,, ";' {X"".':-'; \ ..... .':'.. " .... . ,', 􀀧􀁾􀀬􀀢􀀻􀀮􀀼􀀬􀀺􀀮􀀢􀀬􀀠􀁾􀀠. '. 􀁾􀀧􀀢􀀠Developmynt 􀀢􀀬􀁾􀁾􀁴􀁣􀁾􀁾􀁾􀁾􀀠J J:'" "")-'1-:-'􀀬􀁥􀁟􀀺􀀢􀁟􀂷􀁾􀂷􀀨􀁾􀁾􀁩􀁾􀀡􀁾�
�􀀺􀁾􀁾􀁾􀁾􀀧􀁾􀁾􀀻􀀠" " .. " ,"I 􀀢􀁲􀀬􀀬􀀺􀀺􀀬􀀮􀁾􀁾􀁾􀁰􀀻􀁾􀁯􀁩􀀮􀁱􀀺􀁬􀁴􀀻􀁾􀁾􀁈􀁾􀁾􀀮􀀬􀁾􀁾􀀮􀁦􀀺􀁾􀁪􀁴􀀠, ,.. No. of Permits on site .: 􀀬􀁾􀀧􀀮􀀠• 
March 19,2002 Mr. James Pierce, P.E. Town of Addison 16801 Westgrove Drive Addison, Texas 75001-0144 Re: Letter of Transmittal Phase II Environmental Site Assessment Addison Airport
Addison, Texas Dear Mr. Pierce: Transmitted with this letter are four (4) copies of the Interim Status Report for the above referenced project as presented in our proposal. Also transmitted
is one (1) copy of the soil vapor program conducted by Exploration Technologies, Inc. (ETI). The copy ofthe ETI report includes color plates for the various soil vapor parameters evaluated.
A reproduced black and white version of the ETI report is included as Attachment A in our Interim status Report. Washington appreciates this opportunity to be of service to the Town
and looks forward to completing this study. If you have any questions, please call me at 713.852.3035. If I am not available at the time of your call, please call Ron Bowlin at 713.852.3030.
Sincerely, WASHINGTON GROUP INTERNATIONAL 􀀦􀀯􀁾􀀠Manager of Environmental Services Incl:4 copies 9433I<irbyOllw, Houston, TX 77054 • P.O. Sox '28, Houston, TX mS"'28' • Phone, (7'3) 852·:lOO0 • Fax: (713) 383-9'49 WHN.wgIntcom 
JIM PIERCE, P.E. Assistant Public Works Director (972) 450·2879 (972) 450.2837 FAX jpierce@ci.addison.tx.us Town ofAddison 16801 Westgrove Dr. P.O. Box 9010, Addison, Texas 75001·9010
􀁾􀀭􀀭􀁉􀁣􀁴􀀭􀁏􀁌􀀠􀁾􀀮􀀠􀁾􀁲􀁾􀁾􀁴􀀱􀁦􀀱􀀱􀂷􀀠 􀁾􀁲􀁾􀀭􀁦􀁫􀁾􀀠dv-􀁦􀁾􀀠􀁌􀁊􀁾􀀠􀁾􀁲􀀭􀁾􀀠􀁍􀀭􀁾􀀠Iv-􀁾9 i4t4L ur; t 􀁾􀀠4 􀁾􀁾􀁣􀀮􀁲􀁮􀁾􀀠r· 􀁾􀁾􀁦􀁫􀀭􀁾􀀠􀁾􀀬􀀠..􀀭􀀭􀀧􀁾􀀠􀀮􀁾..-'
-' ." ; .; ,.,'. .....-, 
GwaShington llIJIustrlal/l'rlJcess Wednesday, February 27, 2002 WGI Project No. 25361 QP&ES 02-E002 Mr. Mark Acevedo Administrator Facilities & Fleet Services Town of Addison P.O. Box
9010 Addison, TX 75001-9010 PROPOSED SCOPE OF WORK FOR SUPPLEMENTAL CONSULTATION SERVICES PHASE II ENVIRONMENTAL SITE ASSESSMENT .ADDISON AIRPORT FUEL FARM ADDISON, TEXAS, Dear Mr. Acevedo:
In accordance with your instructions during our meeting on February 20, we are forwarding to you our proposal to provide supplemental consultation services to assist the Town of Addison
in developing a strategy for managing the Fuel Area at Addison Airport. 􀀻􀀮􀁾􀀮􀁾􀀺􀀠: .-.:,,\Backaround fl;, . '", . : , • The Town of Addison-retained Washington Group International,
Inc., (Washington) to conduct a Phase II Environmental Site Assessment of the Fuel Area at Addison Airport. We conducted a soil vapor survey and some limited soil and groundwater sampling
and testing to gain a general understanding of baseline subsurface conditions for hydrocarbon contamination, The preliminary findings of the first portion (Tasks 1 to 4) of the study
were presented to the Town during a meeting on December 20,2002. The preliminary findings indicated the presence of hydrocarbons in soil and groundwater at concentrations exceeding Texas
Natural Resource Conservation Commission (TNRCC) Action Limits, or those concentrations above which TNRCC requires additional investigation and/or remediation. Based on these findings,
the Town directed us to develop a program for presentation to the Town Council and cost estimates for possible Fuel Area upgrading or new construction. The scope of work and pricing
to comply with the Town's dire'ctive is presented in the following sections. The Town also directed us to develop the final scope of work to complete the remaining Phase II ESA work,
which consists of complete delineation of the extent and magnitude of the subsurface contamination. The scope of work to complete the remaining work will be submitted under separate
cover. 1250W. Sam Ho...... Pkwy. S. Ho_n, TX 17042 • P.o. Box 1281 HOUShln, TX m51-1281 • Ph"".: (281) 529-3000 • Fax; (281) 529-8960 v.mv.wglntcom 
Mr. Mark Acevedo Wednesday, February 27, 2002 Page 2 Scope of Work We will conduct three tasks that are in addition to the tasks presented in our December 13, 2001 proposal for the Phase"
ESA, consisting of (1) making a presentation to the Town Council to explain the findings to date of our study, (2) conducting a detailed regulatory analysis to identify specific TNRCC
underground storage tank regulations for (a) evaluating Fuel Area compliance and (b) identifying regulations that must be aocounted for in any engineering design work for upgrade or
new construction, and (3) developing cost estimates to (a) upgrade the existing Fuel Area to become compliant with TNRCC regulations and to (b) design and build a new Fuel Area. ' Task
1 -Presentation. We will develop a presentation format that is geared toward graphically demonstrating to the Town Council the extent and magnitude of the subsurface contamination determined
to date. We will attempt to make the presentation as simple as pOSSible, bearing in mind the the probable non-technical backgrounds of the Council members. Technical issues will be addressed
only to the extent necessary to give a general understanding to Council members of the steps taken to derive the deta. We will provide handouts of the presentation slides and/or figures
for Council members and Town management personnel. The presentation will be conducted with PowerPoint or some similar means of graphically displaying the findings. The actual presentation
will be conducted by Washington's Project Manager, Field Manager, and Airport Engineer. We will make the presentation on Wednesday, March 6, 2002, at the 7 p.m. hearing, assuming the
current schedule remains the same. Before the Council hearing begins, we would recommend a dry run of the presentation before Town management personnel. To that end, we have made provisions
to be at the Town during the normal working hours of March 6. Iask 2 -Regulatory Analysis. During the February 20 meeting, the Town indicated a desire to know the regulatory implications
of the Fuel Area operations. Specifically, the desire was stated to know the specific TNRCC regulations by name and number that dictate how the tanks are to be managed. This exercise
is necessary in any case to determine which regulations affect either an upgrading program for the existing tanks or a designlbuild scenario for a new tank farm. Washington's Airport
Engineer will need to know the specific design requirements that are stated in the regulations for either scenario. We will conduct a thorough review of the regulations found in 30 Texas
Administrative Code 334, Underground and Aboveground Storage Tanks, to identify those regulations pertaining to design and operations criteria. Additionally, to the extent pOSSible,
we will identify those regulations that appear to be violated by the Fuel Area operations. We do not have detailed operation logs and tank system design drawings, such that this effort
will be based on what we could see at the surface during previous reconnaissance of the Fuel Area and a general understanding of operational histories. We will not address tank registration,
fees, or other administrative criteria that, although important, are not germane to this effort. When necessary for purposes of clarification, we will also speak with TNRCC personnel
to gain an understanding of their interpretation of the regulations. We will speak with agency personnel in a generic sense without reference to the Town. 
Mr. Mark Acevedo Wednesday, February 27,2002 Page 3 Task 3 -Cost Estimates. Based on the specific regulations of 30 TAC 334 and good engineering practice, our Airport Engineer will develop
two cost estimates, one to upgrade the existing Fuel Area and a second to design and build a new tank farm. We will not take into consideration remediation costs since Wl'J do not know
what, if any, remedial actions will be required by TNRCC. The Airport Engineer will develop some basic drawings in CAD to assist in establishing an upgrade and design basis, but Wl'J
have made no provisions for development of detailed construction drawings and related documents (P&IDs, isometrics, PFDs, material takeoffs, bid tabs). Price The Lump Sum price to conduct
Task 1 through Task 3 as one program is $9900. This price includes (1) labor for development of the presentation, development of the cost estimates and associated drawings, regulatory
analysis, and the actual presentation; and (2) expenses for travel from Denver and Houston, including food and lodging, and reproduction for presentation material handouts. Scope of
Work Acceptance If you accept this scope of work, please sign below or forward us a signed Purchase Order or similar authorizing document that references this Scope of Work. This work
will be conducted as a supplement to the agreement for the Phase II ESA, as previously approved by Mr. Ron Whitehead. Closing Remarks We are pleased to have this opportunity to serve
the Town of Addison and to demonstrate our breadth of capabilities. We look forward to working with you. Sincerely, WASHINGTON GROUP INTERNATIONAL TNRCC RC 00169 PaulR Wild Manager of
Environmental Services TNRCC CAPM00385 Accepted B;J<-W tJut􀁴􀀮􀁾􀀠Ron Whitehead City Manager Date: 
􀁾􀀠[or 4.(fed1'J $a'!!,) (revised draft for approval) Interim Environmental Rep, rt Presented On March 6, the City Council ofthe To ofAddison received a project status briefing from
the Washington Infrastructure Gr p who is conducting an Environmental Site ASsessment ofthe fuel storage area at Ad son Airport. At the request ofthe City Council in 1 98, Camp, Dresser,
McKee conducted a Phase I environmental assessment ofthe airp rt. The Phase I report indicated several areas ofthe airport that required further envi onmental assessment. The Town requested
a Phase n environmental study be perform nd a number offirms responded to the Town's advertised request for proposal. Washington Infrastructure Group was selected to perform the Phase
n study. Washington's current study involves only the fuel storage area that has been in use for more than 30 years. Many ofthe underground tanks are nearing the end oftheir useful life
and some have been abandoned. Ten ofthe 29 known tanks are not being used but still contain fuel. Over the 30-year period, it is estimated that of 􀁦􀁵􀁥􀁬􀁾been released into the environment.
v."I:i The March 6 interim report, based on soil vapor samplings conducted at more than 80 locations in and around the fuel farm as well as soil borings, indicated the presence ofa variety
of hydrocarbon components in the soil. The presence of methane gas in the gas vapor samples indicate that natural attenuation is occurring, that is, bacteria in the soil is acting on
the hydrocarbons, thereby cleansing the soil and returning it to its pre-spill condition. . The consultant report indicates that the fuel farm is not in compliance with current Texas
Natural Resource Conservation Commission regulations. While the interim report indicates that natural attenuation efforts are helping clean up the site, with the continued operation
ofthe fuel farm, more spills are likely to occur and additional remediation efforts may be needed. The consulting group compared costs ofrelocating the fuel mrm to a new site with replacement
of needed equipment at the current site (in order to bring it into compliance with government regulations). Estimates would range from $1.6 million to upgrade and repair the existing
location to $1.9 million for a new site. They also noted that if the repair option was chosen, removing existing tanks might reveal additional pellHtiQQ that would have to be removed
before construction could continue. This would seriously impair operations at the airport and could add to construction costs. While the study will continue for several more months to.more
accurately determine the extent of contamination, the consultants recommended that the Council consider construction ofa new fuel farm at a different site. Further contamination ofthe
present site would be reduced by moving operations to another location, thereby saving additional remediation costs. The final report is expected by early summer 
Project Status Briefing & Recommendations Environmental Site Assessment, Phase II Fuel Storage Area at Addison Airport I ,y.® Washington Prepared for the Addison Town Leadership Presentation
on March 6, 2002 Briefmgs and Presentation By: Paul Wild, Project Manager Ron Bowlin, Field Manager Sam Lundgren, P.E., Aviation Engineer 
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BTEX . CONCENTRATIONS' (ppmv) 􀀽􀁾􀀠􀁾􀁾... > SODl,..----y-=--__ 300 -500 ::,.";'., 100 -300 20-100 􀁾􀀠1:<1 lEGEND 10 -20 2-10 􀀮􀁾􀀠. l==J A..... Contllnlll1) UST, ,;.<1........<:
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" Washington Parameter SampleLoc. PB·l PB·2 Depth, ft 5-6 7-8 􀀨􀁐􀁉􀁄􀀬􀁰􀁾􀁄􀁬􀁬􀀠(96) (93) Benzene Tolnene 0.005 0.0051 Etbylbenzene Xylenes+ 0.0021 0.0021 MTBE C6-CI2 440 CI2-C28
JIlOO SUMMARY OF ANALYTICAL REsULTS (MG/KG) SAMPLE LOCATION PB·3 PB-4 PB·5 PB-6 PB·' PB-8 PB·9 PB·lO PB-4W 2-4 6·7 5-6 5·6 3-4 4·5 3-4 4·5 (275) (3) (0) (130) 10) (0) (25m (300) 2.2
0.005 0.009 0.012 0.012 0.006J 0.008 0.170J 0.11 0.065 6.2 0.0021 0.003J 0.0021 0.0021 1.75 2.4 570 59 42 480 1200 100 1200 2 m!!IL Action Levels: Benzene: 0.5 MG/KG TPH: 100 MG/KG 
" Washington Regulation 3 6 14 DeSCription for Temporary from service Sub Rule and unmonllored systems permanently remove USTs from service or months continuous non-service and be _
to them back into service after 10 by 12 months In the process of in UST excavation zone backfill with [334.50(d)(5)]; or groundwater monitoring where ft bgs In backfill not < 0.01 cmls
hydraulic conductivity [334.50(d)(6)]: or Interstitial vaporniquid monitoring for double-walled USTs [334.50(d)(7)]; or vaporlliquid monitoring in secondary containment barriers (2)
after with 334.51(b), consisting of: tight fill fittings [334.51 (b)(2)(A)]: spill containment equipment such as Ilquld-tlght catchments, manways, risers, sumps [334.51 (b)(2)(B): overflll
prevention eqUipment such as automatic shu1 off valves or flow restrlctors 
􀁾Washington Environmental Deficiencies ofthe Existing Airport Underground Fuel Storage and Dispensing Systems EPA and TNRCC Requirements: • Either double-wall UST or UST installed in
a containment vessel or UST encased in a corrosion proof material (Currently only required for new construction in Texas) • Requirement for installation of corrosion protection system
on all USTs • Installation of positive overflow prevention systems on all USTs • Leak detection alarm system installed for all USTs • Requirement for tightness testing ofUST and underground
piping • Requirement for spill protection and collection device or berming • TNRCC requirement for gasoline vapor entrapment and collection in air quality non-attainment areas (greater
Dallas-Ft Worth) • TNRCC reporting, clean-up, and close-out requirements • OSHA requirement for emergency shut-off switch, alarm, and eyewash unit 
" Washington Reasons to Replace Underground Fuel Storage Tanks • Probability that TNRCC will allow Natural Attenuation ofexisting fuel contaminated subsurface soils if source is removed
• Provides credibility for the Town under the Voluntary Clean-up Program (Innocent Landowner) and allows determination of liability for existing contamination • The existing USTs are
old (installed late 50's to early 60's), cathodic corrosion protection systems are marginal on old tanks, and they must be replaced eventually • The new Texas Risk Reduction Program
(TRRP) will institute more flexible yet possibly stricter standards required for corrective action and clean-up levels • Eventually, TNRCC will adopt current EPA (interstate) standards
• The Airportrrown needs a system to control fuel storage operations 
" Washington Replacement of Existing Underground Fuel Storage and Dispensing Systems Estimate to Upgrade System in Accordance with Current TNRCC Standards: • UST Excavation & Removal
(@$3000/tank) $ 54,000 • Double Wall Storage Tanks (@$2.50/gal installed) $ 875,000 • Surface Containment Structures & OIW Separator $ 40,000 • New Controls, Vapor Cap and Equipment
$ 350,000 • Clean Backfill & Haul $ 8,000 • Miscellaneous (permits, shoring & barricades) $ 7,000 • Contingencies (20%) $ 266,000 • Total $1,600,000 Note: Replacement costs are for the
existing operating tanks, assuming all pumps, meters, piping, and valves are not salvageable and are to be replaced during double wall tank installation (18 USTs must be removed to provide
room for the replacement tanks). Does not include costs for environmental remediation of contaminated soil and groundwater; however, TNRCC may require some subsurface clean-up prior
to installation. 
" Washington New Bulk Fuel Storage and Dispensing Facility New Facility Construction Estimate: • Site work, Pavement, and Utilities $ 195,000 • Containment Structure and Pad $ 180,000
• Storage Tanks and Piping (@$2.00/gal installed) $ 800,000 • Controls and Equipment $ 450,000 • Cover and Structure $ 145,000 • Contingency (10%) $ 1802000 • Contract Construction Total
$1,950,000 Note: New construction consists of sixteen 25,000 gal tanks in a stand-alone, covered facility. 
--........-$1 al al al al 􀁾􀁉􀀠a! 􀁡􀁾􀀠􀁯􀁾􀀠0'" 0'" 0" 0'" 0'" 010 􀁾􀁾􀁉􀁾􀁉􀁾􀁾􀁾􀁾􀁉􀁾􀁾􀁾􀁩􀁾􀀠􀁾􀀠􀁉􀁊􀀮􀀭􀀭􀁾􀀭􀀭􀀫􀀭􀀭􀀭􀀭􀀭􀀭􀀡􀀠-... -... •I •I 
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" Washington New Airport Fuel Storage and Dispensing Facility Off-Load Systems: • Overflow protection with automatic valve closure and pump stop • Infrared particle contamination monitor
with pump stop • Fuel filter with water separator and high level/pressure shut-off • Digital fuel flow meter Fuel Dispensing Systems: • Final in-line filter • Truck fdl auto shut-off
• Dispensing unit reader and digital fuel flow meter Facility Safety Systems: • Remote emergency pump shut-off switch • Emergency alarm system, direct connection to police & fire • Fuel
product leak detection system with alarm • Vehicle-facility grounding system • Full washdown capability • Oil-water separator connected to containment areas • Emergency eye wash units
• Fire protection system • Integrated control panel 
" Washington Underground Fuel Storage and Dispensing System Upgrade Costs at other locations • Replace & Upgrade a Two-UST Fuel System at McKinney Municipal Airport, December 1999, Total
Construction Cost: $198,782 • Replace and Remove UST Fuel System with Two 20,000 bbl AboveGround Jet Fuel Storage Tanks at Phoenix ANG Base, August 1998, Total Construction Cost: $4.750
million, or about $95,250 per 25,000 gal of storage/equip • Replace UST with Above-Ground Storage Tanks at Denton Municipal Airport: $42,000 to pull four 12,000 gal USTs (no clean-up)
and $260,000 to install four 12,000 gal Above-Ground Tanks • Two new 4,000 bbl Above-Ground Jet Fuel Storage Tanks for SW A at El Paso International Airport, June 2001, Total Construction
Cost: $3.1 million, including equipment, piping, and QC/Operations Building, or about $180,000 per 25,000 gal of storage/equip 
" Washington SUMMARY • Majority oftanks are over 30 years old and may be leaking • Thousands of gallons of fuel has been released to the environment • A spill of 1500 gallons occurred
within the last month • Currently, 10 of29 tanks are not being used, but contain fuel • Soil and perhaps ground water contamination are migrating to the West under the THangars and to
the East, under the road • Remediation will be required by the TNRCC; natural attenuation is a very probable option. But, COMPLETE definition of the extent of contamination must be identified
• Tank farm is not complying with current regulations • Either the existing system must be brought into compliance or a new facility constructed • A new, aesthetic and compliant fuel
farm can be constructed at costs similar to major renovation of the existing tank farm 
GWashington 􀁉􀁉􀁉􀁩􀁕􀁓􀁬􀁲􀁩􀁡􀁾􀀱􀁬􀀤􀁓􀀠Wednesday, February 27, 2002 WGI Project No. 25361 QP&ES 02-E002 Mr. Mark Acevedo Administrator Facilities & Fleet Services Town of Addison
P.O"Box 9010 Addison, TX 75001-9010 PROPOSED SCOPE OF WORK FOR SUPPLEMENTAL CONSULTATION SERVICES PHASE II ENVIRONMENTAL SITE ASSESSMENT ADDISON AIRPORT FUEL FARM ADDISON, TEXAS 􀁾􀀠d,'
Dear Mr. Acevedo: In accordance with your instructions during our meeting February 20, we are forwarding to you our proposal to provide supplemental consult ion services to assist the
Town of Addison in developing a strategy for managing the Fu Area at Addison Airport, Background The Town of Addison retained Washington Grou International, Inc., (Washington) to conduct
a Phase II Environmental Site Assessment f the Fuel Area at Addison Airport. We conducted a soil vapor survey and some limite soil and groundwater sampling and testing to gain a general
understanding of baseline ubsurface conditions for hydrocarbon contamination. The preliminary findings of the first ortion Tasks 1 to 4) of the study were presented to the Town during
a meeting 0 20,2002. The preliminary findings indicated the presence of hydrocarbons In groundwater at concentrations exceeding Texas Natural Resource Conservation Commission (TNRCC)
Action Limits, or those concentrations above which TNRCC requires additional investigation and/or remediation. Based on these findings, the Town directed us to develop a program for
presentation to the Town Council and cost estimates for possible Fuel Area upgrading or new construction. The scope of work and pricing to comply with the Town's directive is presented
in the following sections. The Town also directed us to develop the final scope of work to complete the remaining Phase 1\ ESA work, which consists of complete delineation of the extent
and magnitude of the subsurface contamination, The scope of work to complete the remaining work will be submitted under separate cover. ,,.SGW. S.., Howb:lr1 Pkwy. s. HollltDn.'TX n042
• P.O. &.i: 1211 Houston, TX 7125M231 • Phone: (281) 52!HOOO • I";,u;: (281) 529-8966 􀁷􀁷􀁷􀀮􀁾􀁬􀁮􀁴􀁣􀁯􀁭􀀠
Mr. Mark Acevedo Wednesday, February 27, 2002 Page 2 Scope of Work We will conduct three tasks that are in addition to the tasks presented in our December 13, 2001 proposal for the Phase
II ESA, consisting of (1) making a presentation to the Town Council to explain the findings to date of our study, (2) g.onducting a detailed regulatory analySiS to identify specific
TNRCC underground storage tank regulations for (a) _evaluating Fuel Area compliance and (blldentifying re ulations that must be accounted for in any engineering design work for upgra
e or new construction, and (3) developing cost estimates to (a) upgrade the existing Fuel Area to become compliant with TNRCC regulations and to (b) design and build a new Fuel Area.
Task 1 -Presentation. We will develop a presentation format that is geared toward graphically demonstrating to the Town Council the extent and magnitude of the subsurface contamination
determined to date. We will attempt to make the presentation as simple as possible, bearing in mind the probable non-technical backgrounds of the Council members. Technical issues will
be addressed only to the extent necessary to give a general understanding to Council members of the steps taken to derive the data. We will provide handouts of the presentation slides
and/or figures for Council members and Town management personnel. The presentation will be conducted with PowerPoint or some similar means of graphically displaying the findings. The
actual presentation will be conducted by Washington's Project Manager, Field Manager, and Airport Engineer. We will make the presentation on Wednesday, March 6, 2002, at the 7 p.m. hearing,
assuming the current schedule remains the same. Before the Counell hearing begins, we would recommend a dry run of the presentation before Town management personnel. To that end, we
have made prOVisions to be at the Town during the normal working hours of March 6. Task 2 -Regulatory Analvsis. During the February 20 meeting, the Town indicated a desire to know the
regulatory implications of the Fuel Area operations. Specifically, the desire was stated to know the specific TNRCC regulations by name and number that dictate how the tanks are to be
managed. This exercise is necessary in any case to determine vvhich regulations affect either an upgrading program for the existing tanks or a designlbuild scenario for a new tank farm.
Washington's Airport Engineer will need to know the specific design requirements that are stated in the regulations for either scenario. 􀁾􀀠We will conduct a thorough review of the
regulations found in Texas Administrative Code 334, Underground and Aboveground Storage Tanks, to i ntify those regulations pertaining to design and operations criteria. Additionally,
to the ent possible, we will identify those regulations that appear to be violated by the Fuel Ar operations. We do not have detailed operation logs and tank system design drawings,
this effort will be based on vvhat we could see at the surface during previous reconnaissance of the Fuel Area and a general understanding of operational histOries. We will not address
tank registration, fees, or other administrative criteria that, although important, are not germane to this effort. When necessary for purposes of clarification, we will also speak with
TNRCC personnel to gain an understanding of their interpretation of the regulations. We will speak with agency personnel in a generic sense without reference to the Town. 
Mr. Mark Acevedo Wednesday, February 27, 2002 Page 3 Task 3 -Cost Estimate!!.1 Based on the specific regulations of 30 TAC 334 and good engineering practice, our 􀁾􀁲􀁰􀁯􀁲􀁴􀀠Engineer
will develop two cost estimates, one to upgrade the existing Fuel Area 􀁡􀁾􀀧􀀠a second to design and build a new tank farm. We will not take into consideration reme iation costs since
we do not know what, if any, remedial actions will be required by TNRC . The Airport Engineer will develop some basic drawings in CAD to assist in establishing an upgrade and design
basis, but we have made no provisions for development of (IIetailed construction drawings and related documents (P&!Ds, isometrics, PFDs, materi1! takeoffs, bid tabs). Price The Lump
Sum price to conduct Task 1 through Task 3 as one program is $9900 _ This price includes (1) labor for development of the presentation, development of the cost ,estimates and associated
drawings, regulatory analysis, and the actual presentation; and (2) expenses for travel from Denver and Houston, including food and lodging, and reproduction for presentation matTial
handouts. Scope of Work Acceptance If you accept this scope of work, please sign below or forward us a signed Purchase Order or similar authOrizing document that references this Scope
of Work. This work will be conducted as a supplement to th agreement for the Phase II ESA, as previously approved by Mr. Ron Whitehead. Closing Remarks We are pleased to have is opportunity
to serve the Town of Addison and to demonstrate our breadth of capabllities. We look forward to working with you. Sincerely, WASHINGTON GROUP INTERNATIONAL TNRCC RCAS 00169& /f-. :t-p.Manager
of Environmental Services TNRCC CAPMOO385 Accepted By: ----:----;-:c:;-::--:----:---------Ron Whitehead City Manager Date: 
Jim Pierce From: paul.wild@wgint.com Sent: Wednesday, February 27, 2002 3:23 PM To: Macevedo@Ci. Addison. Tx. Us Cc: Jpierce@Ci. Addison. Tx. Us; David_Pearce@staubach. com; Samuel G
Lundgren; Ron Bowlin Mark, thanks for the call. As I mentioned on the phone, we see the project developing in the following fashion: 1. Make the presentation to the Council and get any
feedback that we can reasonably address in the final report for the first part of our study. 2. Provide final report on the study the week after the presentation, in the 3/11 to 3/13
timeframe. 3. Allow Town to digest report. 4. Conference call between Town and Washington sometime during the week of 3/18 at Town's convenience to discuss final scope of work. Three
items to include in discussion: (a) possibility of using existing monitoring wells to support the study; (b)plan for accessing street and adjacent properties to complete the soil gas
survey; (c) estimate the final number of borings and wells with associated testing needed to characterize characterize extent and magnitude of subsurface contamination. 5. Develop final
scope of work based on agreed program from conference call. Submit late in week for week of 3/18 or early week of 3/25. 6. Assuming final approval, proceed with second part of study
early April. I hope this helps. Let me know if anything needs clarification. Thanks for your feedback. Paul 1 
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BONDS January 22, 2002 11r. James Pierce Via Mail &: Fax Town of Addison P.O. Box 9010 Addison, TX 75001-9010 RE: Certificate of Insurance Washington Group International, Inc. Dear James,
Per our client's request, enclosed are certificates of insurance for the above referenced. There are two separate certificateS. One has three pages, and it evidences all required coverages
except the Environmental Liability requested in the contract. The Environmental/Pollution coverage is shown on a separate, single page, certificate. Please call ifyou have any questions.
Thank you!Si"hl Jenny Skillicom Enel. co: Karen Frans, Risk 11anagement Ron Bowlin, WGl-Houston, TX (Via Fax) Charles Nash, WGr -Houston, TX (Via 11ail) # 1/5 II " Ii , , H ..., j I
􀁾􀀠1'9 ; j i i Pas! Office Box 16130· 262GRadio Way, Sulle C· Missoula. Monrana 598GB, (4061726.4050 FAX' (4061728·5457 
5 # 2,/1-22-02; 9:47AM;TERRY PAYNE 􀁾􀁎􀁄􀀠CO · ... 015 541 7590 C Terry Payne & Co., Jnc. P.O. Bo. 16130 MIssoula. MT 591308 406-7284050 WASHINGTON GROUP INTERNATIONAL, INC. 9433 KIRBY
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THE TERMS. SHOWN MAY HAVE seEN REDUCED BY PAID ClAIMS. TYPE OF INSURANCE iXl 􀁃􀀼􀀧􀁍􀀧􀁉􀁅􀁾􀁃􀁏􀁁􀁬GENERAL LIABILITY ANY AUTO ALL OWNED AUTOS SCHEOUl.ED AUTOS HIREOAUTOS NON·OWNED
AUTOS ; ANY AUTO UMBRELLA rORM OTHER THM UMBRB.LA FORM INCl ext!. RTC2JUB-260T9149-99 LE960S136 AND ENGINEERS' LIABILITY TO $2,000,000 COMBINED SINGLE LIMIT. EACH ACCIDENT RISK, SUBJECT
TO POLICY TERMS. CONDITIONS AND DEDUCTISLES TOWN OF ADDISON P.O. BOX 9010 ADDISON, TX 75001·9010 POLICY E'I'I'ECTNE POLICYExPIRAT10H, DATE (MIIl/'POffY) DAT£ (M.WDOIYV) , LIMITS 411199
4/1102 411199 411102 COMBINE!)SINGlE UMIT $ 10/01196 1011103 : BODIL'( INJURY i {Pel perSOn) 'I' BODILY INJl1RY I(Par eccident) PROPEm'l' OAMP..GIi U SEE ATTACHED·" $ !)(f'lRATtON OA1E
'THEItEOF, THE ISSUlNG COMPAHY wn.l E:NOEAVOR TO MAl!. 􀁾DAYS WlUl"TEN NOTiCe TO TH(,; CeRTIFICATE HOLl:J$ 􀁎􀁁􀁍􀁾􀁄TO ilIE: LEfT, BUT FAILURE TO NAIl. SUCH 'NOTICE SHAl!.IUI'{)S£ NO
OBLIGATION OR lIASIUTY OF ANY KINO UF'OH THe CDJoIIPAH'I', rrs AGENTS OR REPRESENTATIVES. 2000000 411199 411102 
5 1-22-02; 9:47AM;TERRY PAYNE 􀁾􀁎􀁄􀀠CO . -·06 541 7590 # 3/DESCRIPTION OF OPERATIONS/LOCATIONS/VEHICLES/SPECIAL ITEMS INSURED, Washington Group International, Inc. •, 􀁾􀀠HOLDER: Town
of Addison P.O. Box 9010 Addison, TX 75001-9010 RE: Collection of Soil Vapor, Soil, and Groundwater Samples to Characterize the Surface Conditions for a Phase II ESA. "• Washington Contract
No. 25361 Town of Addison, Texas, and its Officials, Officers, Agents, and Employees are included as Additional Insureds in accordance with the attached policy endorsement language.
(General Liability Only) Town of Addison, Texas, and its Officials, Officers, Agents, and Employees are included as Additional Insureds. (Automobile Liability Only) A Waiver of Subrogation
in favor of all Assureds is included. It is further understood and agreed that coverage provided by this policy shall be primary as to any other valid and collectible insurance. SEVERABILITY
OF INTERESTS (Cross Liability): It is agreed that the inclusion of more than one insured under this policy shall not operate to impair the rights of one insured against another insured
and the coverage afforded by this policy shall apply as though ,. separate policies had been issued to each insured. The inclusion of more than one insured shall not, however, operate
to increase the limit of the company's liability. ** Companies affording coverage include Lloyds of London & participating Companies. ; ; signed by: 􀁾􀀺􀁭JJ.,."fa:u".;) , , 􀁔􀁾􀀠yne
& co., Inc. P.O. Box 16130 Missoula, MT 59808 Serial#: 3181 Page 2 
:-22-02, 8:47AA1;TERRY PAYNE ¢.t"D co To be attached to and become a part of the Certificate of Insurance issued to the Town of Addison. GENERAL LIABILITY: policy Number: RTC2JGLSA-261TISI4-99
It is agreed that the definition of Insured is amended to include any person or organization the Named Insured is required by written contract to include as Additional Insured. The "written
contract" must be executed prior to the "occurrence" of any loss. Insurance provided by this amendment is limited to the extent of coverage and limits of liability required by the "written
contract," and will not increase the limits of the policy or the extent of coverage stated in this policy. The insurance provided by this amendment is limited to only the Legal Liability
arising out of the performance of the Named Insured's work under the written contract and shall terminate at the time of completion, or such other time as defined in the written contract.
With respect to the insurance afforded the Additional Insureds, it is further agreed that this insurance does not apply to liability for "Bodily Injury" or "property Damage" arising
out of acts or omissions of the Additional Insured unless this has been agreed to by written contract executed prior to the "occu=ence" of any loss. Signed By: Serial#: 3181 Page 3 
1-22-02; $:47AM;TERAY 􀁐􀁁􀁙􀁾􀁅􀀠·"NO CO .... pe 54; 7590 #. 5/5 Terry Payne & Co., Inc. P.O. Box 161)0 Missoula. MT 59808 406-728-405D WASHINGTON GROLIP INTERNATIONAL. INC. 9433 KIRSY
DRIVE HOLISTON. TX 77054 EXCLUSIONS AND CONDITIONS TYPE OF INSURANCE ?OLley NUMBER COMP<\!>h' B TRAVELERS INDEMNITY COMPANY OF ILLINOIS POUC'f1?XPlRAiION :1' O<\'TE {UMIDO!'f'I') I LIMITS
iT<iiii<I!l<S' • COfURACroR'S PROT ilOO",,,,,C/A,,,,,NEIF!AI. LIABILITY MADE O°CCUR I ANY AUTO All OWNED AUTOS SCHEDULED AUTOS HIRED AUTOS NON-OWNED AUTOS ANY AUTO UMBREllA FORM OrneR
THAN UMBREI.LA FORM. EMPLOYERS'llASIUTY 􀁐􀁾􀁕􀁔􀁲􀁶􀁥􀀠OFF'leERSAAE: f-j"""", ;RTC2.I-GI.5P,-165D5266-99 411/99 411102 I..'.IJUU.UUU EACH CLAIM 􀀱􀁾􀀼􀀬􀁉􀁊􀁶􀁵􀀬􀁶􀁷􀁁􀁇􀁇􀁒􀁅􀁇􀁁􀁔􀁅􀀠SAMPLES
TO CHARACTERIZE THE SIJRFACE CONDITIONS FOR A PHASE II ESA. EXP1RAT10N: DATE THEReOp, THE ISSUfNG COMPANY WILL ENDEAVDR TO MAil 􀁾DAYS WRITIEH NOTICE to THe CERTIFICATe HOLDER HAMED
1'0 THE LEFT. BUT FAILURE TOMAIL SUCH NonCE SHAlL IMPOSE NO OSL1GATlOH OR. LIAI!IIUTY OF AMY Kmo UPON THE COMPANY. ITS AGEtn'S OR REPftfSfHTATlVE$, I. 1il00flY INJURY $ , (FarPGMlO.,.
BODILY If.IJt.'1W COMBINED SINGlE LIMIT :$/Per acd:denl) PROl'myV OAMAGE r• h ,. i' TOWN OF ADDISON P.O. BOX 9010 ADDISON, IX 75001-9010 
/-1 tj.-D;J-.. 􀀨􀀨􀁬􀁣􀁬􀀺􀀭􀁏􀀫􀁴􀀭􀀭􀁾􀀨􀁾􀀠,-􀁰􀁾1L 􀁾􀁾􀀠􀁾􀁾􀀭􀁾􀀠􀁾􀁴􀁊􀁯􀁍􀁵􀁲􀁾􀀠􀁐􀁾􀁊􀀠UJJj/􀁾􀁾􀁾􀀠􀁾􀁾􀀠􀀱􀀴􀀡􀁊􀀱􀁾􀀠􀁾􀁾􀁾􀀭􀀭ElJ 􀁾􀀠-PA 􀁾􀁾􀁴􀁦􀀩􀁾􀁾􀀠􀁾􀁾􀁾􀁾􀀠􀁾-􀁾􀁹􀁾-fYlci5
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DATE SUBMITTED: December 4, 2001 FOR COUNCIL MEETING: December 11, 2001 Council Agenda Item:_____ SUMMARY: This Item is 10 award a contract 10 conduct a Phase II Environmental Assessment
ofthe Addison Airport Fuel Farm. FINANCIAL IMPACT: Funds Available: $85,000 Cost: $81,800 Funding Source: Airport Fund BACKGROUND: The Airport Phase I Environmental Assessment Update
ofthe Airport that was completed in August 2001 by Camp, Dresser and McKee, recommended that a Phase II Environmental Assessment be performed on the Airport Fuel Farm. The purpose ofa
Phase II is to determine the extent of soil and groundwater contamination, ifany, as a result ofoperations at the fuel funn. The Town solicited statements of qualifications from interested
firms, and received ten responses. The Town evaluated the responses and selected Washington Group International to submit a proposal to do the work. A copy ofWashington's proposal is
attached. RECOMMENDAnON: Staffrecommends that the City Manager be authorized to contract with Washington Group International for Tasks 1 through 4 for a lump sum amoant of$42,600, and
for Tasks 5 and 6 on a time and materials basis, for a total amount not 10 exceed $81,800.