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KLEINFEL DER <br /> Bright People.Right Solutions. <br /> Geotechnical Engineering <br /> TECHNICAL MEMORANDUM Materials Testing&Inspection <br /> Environmental Science&Engineering <br /> Water Resources <br /> Earthquake Engineering <br /> Air Quality <br /> DATE: December 29, 2020 <br /> PROJECT No.: 20181648.005A <br /> To: San Joaquin County Environmental Health Department <br /> 1868 East Hazelton Ave. <br /> Stockton, CA 95205 <br /> SUBJECT: Work Plan for Monitoring Well Replacement Permit Application <br /> City of Stockton, Municipal Utilities Department <br /> Parcel 163-330-030-000, 2500 Navy Drive <br /> Stockton, San Joaquin County, California <br /> Work will consist of replacing an existing standpipe piezometer monitoring well (MW-2) with a <br /> new grouted in-place vibrating wire piezometer (MW-3) for geotechnical investigation purposes <br /> at the existing City of Stockton, Municipal Utilities Department Facilities at 2500 Navy Drive, <br /> Stockton, California (Parcel 163-330-030-000). The location of MW-2 and the proposed location <br /> of MW-3 are shown in the attached map. <br /> The existing standpipe piezometer monitoring well, MW-2, consists of a 2-inch PVC installed to a <br /> depth of 50 feet. The MW-2 boring log and well diagram are also attached. MW-2 will be over- <br /> drilled and grouted immediately upon completion of drilling in accordance with DWR Standards <br /> by backfilling the borehole using a neat cement grout mix with a water to cement ratio of 3 gallons <br /> of water per 47-lb sack of cement using a tremie pipe. <br /> The proposed MW-3 will be drilled to a maximum depth of 75 feet below the existing surface. Soil <br /> sampling will occur within a 4- to 8-inch diameter vertical borehole drilled with either hollow stem <br /> auger or mud rotary drilling techniques. Upon completion of drilling, a Vibrating Wire Piezometer <br /> (VWP) will be lowered into the borehole. While the VWP is suspended inside the borehole, the <br /> borehole will be backfilled in accordance also with ❑WR Standards. A diagram of the grouted in- <br /> place VWP is shown below. A well cover will be installed to protect the piezometer and data <br /> logger, and to allow access to download the data from the data logger. <br /> r:uU. <br /> granted <br /> 20181648.005A Page 1 of 2 December 29, 2020 <br /> Copyright 2020 Kleinfelder <br /> 2001 Arch-Airport Road, Suite 100, Stockton, CA 95206 p 1209,948.1345 f 1209.234.4700 <br />