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ION-SITE �l.11 F,v- �� TECHNOLOGIES r.r.1P13 -t-. CA��')rDD8 Work Plan for the Installation of Soil Vapor Extraction/Groundwater Co-extraction Wells Former Diamond Lumber Site, 151 South Main Street,Manteca,California September 8, 1997 This work plan is prepared at the request of the San Joaquin County Environmental Health Division and pertains solely to the installation of the proposed SVE/GW co- extraction wells. Location: Former Diamond Lumber Site 151 South Main Street Manteca, California Site Owner: Value Reclamation Corporation 1715 S. Bascom Avenue Campbell, California 95008 Contact: Mr. Nairn Albert (408) 371-6800 Background On July 23, 1997, On-Site Technologies, Inc. (OST), on behalf of Value Reclamation Corporation, submitted a Corrective Action PIan for remediating soil and groundwater at the former Diamond Lumber site located at 151 South Main Street, Manteca, California. Although the report was not approved as a formal Corrective Action Plan, the approval was implied for implementing the remediation plan as an interim measure while data was developed to support the formal Corrective Action Plan. A key provision of the remediation proposal was the installation of four soil vapor and groundwater co-extraction wells. The proposed design of these wells has been successfully implemented on numerous similar remediation projects. Scone of Work QST proposes to install four new extraction wells at the locations illustrated on the Remediation Site Plan, attached Figure 1. The wells will consist of 4'/z-inch diameter casing installed within a 12-inch diameter boring. The wells will be completed to a depth of 30 feet below ground surface (bgs). The wells will be perforated in the interval from 10 feet bgs to 25 feet bgs except for co- extraction well EW-1, which will be perforated in the interval from 7 feet to 30 feet bgs. The bottom five feet of casing in all proposed wells will be blank. The purpose for the blank is to provide a silt settling sump so that the extraction pump can be placed as near to the bottom of producing zone as possible, while retarding production of water from the layers deeper than 25 feet. One bucket of bentonite pellets will be placed at the bottom of each well, beneath the sand pack. Another bucket will be placed between the sand pack and the cement seal. The construction details of the proposed wells are illustrated on attached schematics, Figures 2 and 3. (408) 371-481u w FAX (408) 371-2010 v Califciria C.o«tracEol s i :cr j re