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*AFIWM Camp Dresser.&McKee Inc. <br /> oonsutting One Walnut Creek Center - <br /> engineering 100 Pringle Avenue,Suite 300 <br /> ,Q <br /> construction Walnut Creek,California 94596 <br /> operations Tel:925 933-29Q0 Fax:925 933-4174- <br /> March 29, 2001 <br /> Mr. Amin Kazimi <br /> City of Stockton ' <br /> Department of Municipal Utilities <br /> 2500 Navy Drive <br /> Stockton, CA 95206 <br /> Subject: Work Plan for Geotechnical and Environmental Services <br /> Brookside Pump Station <br /> Stockton, CA <br /> Dear Mr. Kazimi: <br /> On behalf of the City of Stockton, Camp Dresser.&Mckee Inc. (CDM),has prepared this <br /> Work Plan,in order to describe the activities and procedures to be performed as part of a <br /> geotechnical engineering investigation at the south wall of the Brookside Pump Station <br /> located in Stockton, California (Figure 1). <br /> 1.0 Project Background <br /> The City of Stockton plans to replace a deteriorating wall on the south side of the existing <br /> Brookside Pump Station (Site). The wall has failed due to corrosion of the,reinforcing <br /> steel and.degradation of the concrete. During construction of the new wall, temporary <br /> excavation support will be needed in order to cast a new wall in.front of the existing wall. <br /> Data-collected during Camp Dresser &Mckee's (CDM) geotechnical investigation will be <br /> used to aid in design of the temporary excavation support. <br /> 2:0 Field Investigation <br /> The objective of the subsurface investigation is to characterize the engineering properties <br /> of the soil and groundwater adjacent to the south wall of the Brookside Pumping Station. <br /> A grab groundwater sample will be collected and analyzed for possible contamination in <br /> order to plan proper handling procedures for future de-watering activities at the Site. A <br /> geologist will coordinate exploration activities, locate the borings, collect soil and <br /> groundwater samples, and prepare field test logs. <br /> Prior or mobilization of the drill rig, CDM will locate two borings, B1 and B2 (Figure 2). <br /> The boring locations and access will be verified in the field and marked with white paint. <br /> Borings B1 and B2 will be advanced using hollow stern auger drilling techniques. Boring <br /> B1 will be drilled to a depth of approximately 35 feet below ground surface (bgs), and <br /> i <br /> i <br />