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i <br /> Advanced <br /> GeoEnvironmental , Inc . :- <br /> 12 March 2010 <br /> AGE-NC Project No. 99-0682 <br /> Ms. Lori Duncan <br /> San Joaquin County Environmental Health Department ( J <br /> 600 East Main Street HEC <br /> Stockton, California 95202 <br /> MAR 1 g 2UiU <br /> Subject : Interim Remediation Piping Install ENVItRlONMIENT HEALTH <br /> STALLWORTH AUTO SALES FAERMIMSER`dICES <br /> 602 North California Street, Stockton, California <br /> Dear Ms. Duncan: <br /> On behalf of Mr. Gary Stallworth of Stallworth Auto Sales, Advanced GeoEnvironmental, Inc. <br /> (AGE) has prepared this letter detailing the installation of interim remediation piping network for <br /> soil vapor extraction (SVE) at 602 North California Street, Stockton, California (site) . San Joaquin <br /> County Environmental Health Department (EHD) approved of the installation of a SVE remediation <br /> system by letter dated 08 August 2008 . <br /> REMEDIATION PIPING INSTALLATION <br /> On 26 January and 01 , 02 February 2010, trenching (shallow), backfilling, compaction, and asphalt <br /> repairs of the remedial piping network, were performed by Cal West Concrete Cutting, Inc, (Cal <br /> West) of Manteca, California. SVE remedial system piping was installed underground in a 5-inch <br /> wide by a 8-inch deep trench; the remedial piping was routed above ground, along side of the zero- <br /> lot-line warehouse building to the east. The above ground piping is protected by a raised curb to the <br /> immediate west; the trenching lay-out is depicted on Figure 1 . <br /> A manifold of three-inch diameter, schedule 40 PVC piping was installed from remediation well <br /> heads VW- I through VW-4; from the well heads, the three-inch PVC piping led to a common three- <br /> inch diameter, schedule 40 PVC piping-network utilized by all of the remedial wells . The shared <br /> three-inch PVC piping-network terminated at the base of the future location of the SVE system. <br /> Following all of the remedial piping placement, trenches were backfilled, compacted and covered <br /> with concrete or asphalt. <br /> 837 Shaw Road, Stockton, California 95215 <br /> Telephone (209) 467- 1006 Fax (209) 467- 1118. <br />