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WALLACE'i KUHL April 18,2001 <br /> ErASSOGATES INC , <br /> • <br /> Geotechnical Engineering Ms.Margaret Lagorio 2/ <br /> San Joaquin County Public Health Services Department <br /> Engineering Geology 304 east Weber Avenue,Third Floor <br /> Environmental Consulting Stockton,California 95202 <br /> Remediation Services WellAbandonment Workplan <br /> Construction Inspection 1444 MARII'OSA ROAD <br /> Stockton,California <br /> Materials Testing Wj{A No.2938.08 <br /> As required by San Joaquin County Public Health Services Department <br /> (SJCPHSD)and the California Regional Water Quality Control Board,Central <br /> Valley Region(CRWQCB,CVR)fousite closure,we have prepared this brief <br /> workplan to <br /> orkp describe the proposed well destruction for seven monitoring wells and <br /> E � three vapor extraction wells located at the above site. The purpose of this work will <br /> 1 be to complete the final requirements to receive a`bio further action status"for the <br /> site. <br /> The site is located at the intersection of Mariposa Road and Charter Way in <br /> Stockton,California(Plate 1).The specific locations of the seven groundwater <br /> monitoring wells and the three vapor extraction wells are shown on Plate 2. <br /> The wells will be destroyed using the following procedures: <br /> • Determine the total depth of each well using a weighted tape measure <br /> • Pressure grout each well to the surface using a tremwie system and pressure <br /> cap. The grout will consist of neat cement grout containing approximately <br /> 5%bentonite powder <br /> CORPORATE OFFICE • Once,grouted,remove the utility box and over-drill a minimum of three fed <br /> 3050 Industrial Blvd. <br /> West Sacramento e Place SOIL over the top of each well,compact and resurfacd to match existing <br /> CA 95691 asphalt as well as possible <br /> Tel 916.372.1434 <br /> Fax 916.372.2565 <br /> I. ROCKLIN OFFICE The vapor extraction systems consist of a horizontal PVC.'frame place <br /> 500 Menlo Drive, approximately 35 feet below site grade and connected to the surface with a vertical <br /> Suite 100 <br /> Rocklin,CA 95765 PVC riser. The vertical riser is then connected to a manifold system using <br /> fel 916.435.4722 <br /> Far.916.435.4822 <br />