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FMtOfl As soc <br /> fates <br /> U01433 North Market Boulevard • Sacramento,California 95834-1943 . (916)928-3300 • Fax(916)928-3341 <br /> October 3, 1994 <br /> Project 0805-109.01 <br /> Mr. Robert Vieira <br /> 1131 West Bowman Road <br /> French Camp, California 95206 <br /> Re: Authorization to Drill Three Borings and Install Three Vapor Extraction Wells <br /> and Associated Pipeline on Parcel No. 24 of the San Joaquin County Assessors <br /> Map, Page 10 of Book 209 <br /> Dear Mr. Vieira: <br /> At the request of ARCO Products Company (ARCO), EMCON Associates (EMCON) is <br /> conducting a subsurface environmental investigation at ARCO Service Station No. 6100 <br /> at 25775 South Patterson Pass Road, Tracy, California. In conjunction with our on-site <br /> investigation, ARCO has requested that EMCON perform an off-site environmental <br /> investigation at nearby properties. This letter is to request authorization for EMCON and <br /> our subcontractors to drill three borings and install three vapor extraction wells on your <br /> property, Parcel No. 24, of the San Joaquin County Accessors map, page 10 of Book 209; <br /> the parcel is at the intersection of Interstate Route 580 and Patterson Pass Road, <br /> California, which is south of ARCO Service Station No. 6100. The environmental <br /> investigation we propose to conduct on your property will provide data on the condition <br /> of soil south of the ARCO station and comply with San Joaquin County Public Health <br /> Services requirements that hydrocarbons in soil be delineated. <br /> We have enclosed ARCO's License Agreement and three figures. Figure 1 is an Area Site <br /> Plan showing features near ARCO Service Station No. 6100. Shown on Figure 1 is the <br /> approximate location of the vapor extraction wells we propose to install on your property. <br /> Figure 2 is a Schematic Well Design showing the construction of a typical vapor <br /> extraction well installed by EMCON for projects throughout California. <br /> The vapor extraction wells will be drilled using a truck-mounted drill rig with 8- to <br /> 10-inch-diameter augers. A 4-inch-diameter polyvinyl chloride casing will be installed in <br /> the boring. For safety and security reasons, the top of the casing will be fitted with a <br /> locking cap and an aluminum cover with specially designed fasteners. The aluminum <br /> cover will be set approximately 2 feet above surrounding grade and painted a bright color <br /> for visibility. <br /> Each boring will take approximately 3 hours to drill, and each vapor extraction well will <br /> take approximately 4 hours to install. We anticipate the work will be completed in <br /> approximately 2 days. Two subcontractor personnel will operate the drill rig, and a <br /> geologist from EMCON will be present during drilling. Every effort will be made to keep <br /> the work area clean and to restore the area to the original condition when the work is <br /> SAC/pj0\D805\08051090.l dl-94 lfc:2 <br />