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i "Alan Anselmo" To <Jay_Kamine@urscorp.com> ` <AAnselmo@eticeng.com> cc "Gopi Chandran" <GChandran@eticeng.com> 08/31/2006 07:52 PM bcc Subject World Enterprises Project Jay, As discussed, I wanted to clarify a few items for the installation of the passive methane gas collection trench at the World Enterprises site in Stockton. Following is a description of some clarifications and a list of some materials that we propose to use for the project: (1) - A pdf is attached (Figures 1 and 2), which shows ETIC's proposed trench construction method (i.e., excavating the upper 7 feet of existing material, followed by then excavating the remainder of the 3 -foot wide collection trench). (2) - As agreed upon during our site visit on August 29, 2006, the trench will be installed approximately 20 feet beyond existing wells VW -4 and VW -5, for a total length of approximately 170 feet. The total depth of the trench will extend to approximately 24 feet below the existing ground surface (bgs) based upon our measurement of the depth to groundwater during our site visit (approx. 19 feet bgs in well MW -01) and the desire to extend the trench to a depth of 5 feet below the groundwater surface elevation. (3) - Per the attached drawings, 3/4 -inch drain rock will be used to backfill the trench from the bottom of the trench up to 7 feet bgs. At 7 feet bgs, a Mirafi 140NC nonwoven geotextile fabric will be placed, followed by 4 -inch diameter Schedule 40 PVC well screen with 0.040 -inch slot size that will be placed on top of the fabric. Approximately 2 feet of additional 3/4 -inch drain rock will be placed on top of the well screen, and then the fabric will be wrapped around the drain rock. (4) - A total of 4 vent pipes will be installed at 50 -foot intervals per the attached drawings with three 4 -inch diameter by 6 -foot long concrete -filled steel bollards around each vent pipe. A 4 -foot by 4 -foot by 1 -foot thick concrete pad will be poured around each vent pipe and three bollards (Note that there are some slight modifications, primarily in materials and fittings, that have been made to the URS schematic of the bollard/vent pipe that you previously provided). We're looking forward to starting this project on Wednesday, September 6th! Also, our Health and Safety Plan is currently being finalized and should be completed by tomorrow --please let me know if you would like to see a copy of the plan prior to the start of the project. Thanks, Alan J. Anselmo, P.E. Program Manager ETIC Engineering, Inc. 1330 Broadway Street, Suite 600 Oakland, California 94612 Phone: (510) 208-1600 x14 Fax: (510) 208-1604 Email: aanselmo@eticeng.com