Bruce,

Please review this information and where needed address this in RFI #24.

Thanks,

Clay Barnett, P.E.

Town Engineer

Town of Addison

16801 Westgrove Drive

Addison, TX 75001-2818

Office: (972) 450-2857

 <http://www.addisongreen.info/> 

 

From: Bill Campbell [mailto:owcampbell@kleinfelder.com] 
Sent: Thursday, July 22, 2010 5:28 PM
To: Wade Geistweidt; Clay Barnett
Cc: Douglas Land; Joel Peters; Noel Janacek
Subject: Re: Fwd: Response to RFI No. 24 for project "Vitruvian Infrastructure Phase 1C Park"

 

Clay-

 

We are ok with the increase in the water content specification to 0 to +4% over optimum moisture as determined by a standard proctor (ASTM D698).  

 

We have concerns about the lack of a performance specification for the clay liner with regard to permeability.  Typically, a permeability specification like 1 x 10 -7 cm/sec2 or better
is required.  The material is remolded and tested in the lab as part of the submittal and then samples are taken of the in-situ material to verify that it is meeting this requirement.
 

 

Additionally, special care should be taken around any and all penetrations through the clay liner.  This might include using bentonite, plastic liner material welded to the penetrating
element or sealing pipe joints to make sure that the penetration through the liner doesn't allow water to escape.  We are working on another pond and liner project that they have been
getting to try to hold water for 2 years now.  The penetrations are the problem on these types of projects.

 

 

Bill Campbell, Jr., P.E.
N. Texas/Oklahoma Business Unit Leader
2035 Central Circle #110
McKinney, TX 75069

o| 972.562.4677
c| 214.837.4476
f| 972.542.4366


 <http://www.kleinfelder.com/> 

>>> Wade Geistweidt 7/22/2010 12:10 PM >>>

Attached you will find the RFI for the clay liner for the upper lake.  I asked the question this morning in the weekly progress meeting if we could increase the upper moisture limit
from +2 to +4.  Bruce Dunn with ICON engineers was okay with this however I was asked to put this in a formal response.  I have recommended that the contractor use the onsite gray shale
and weathered shale materials.  The contractor has stockpiled this material and we have performed the proctor, PI and -200 testing required in ICON response.  This material met or exceeded
the requirements set by ICON.  

 

Your help with a formal request would be appreciated.  I will give my response if one of you will proof read it and add content if needed.  I would like to try and get this posted to
projectmates today before I leave for Vacation.

 

 

Kleinfelder has perform the required PI and -200 testing for the shale material that was selected for use as the clay liner.  In this type of application we feel that increasing the
allowable moisture content from +2% to +4%.  This will help with workability and produce a better long term product for The Town of Addison.    

 

 

Thanks

 

Wade Geistweidt
Engineering Technician
2035 Central Circle suite 110
McKinney, TX 75069
o| 972.562.4677 
c| 469.576.9951
f | 972.542.4366

 

 
 
Warning: Information provided via electronic media is not guaranteed against
defects including translation and transmission errors. 
 
If the reader is not the intended recipient, you are hereby notified that any
dissemination, distribution or copying of this communication is strictly
prohibited. If you have received this information in error, please notify the
sender immediately.