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SITE INVESTIGATION WORK PLA <br /> 800 WEST CHURCH STREET <br /> STOCKTON, CALIFORNIA <br /> )ME�S_F <br /> will be disposed following receipt of the soil laboratory analytical data and acceptance by an <br /> appropriately licensed disposal facility. Following completion of soil sampling, the boreholes <br /> will be backfilled to the ground surface using a bentonite/Portland Type II cement grout. The <br /> borings will then be completed to match the existing ground surface. <br /> 3.3 TASK 3: GROUNDWATER SAMPLING <br /> Groundwater samples will be collected from borings depicted on Figure 1-1. A summary of the <br /> groundwater sample collection methodology is presented below. <br /> 3.3.1 Groundwater Sample Collection Methodology <br /> Groundwater samples will be collected by advancing the borings to a depth of approximately <br /> four-feet below first encountered groundwater. Temporary well casing will then be placed in the <br /> borehole to facilitate sample collection. The base of the temporary well casing will be outfitted <br /> with a3/4-inch diameter 5-foot long Schedule 40 polyvinyl chloride (PVC) pre-pack slotted well <br /> screen. The pre-pack slotted well screen will be constructed of 0.010-inch slots and a 42/16 sand <br /> filter pack enclosed with a stainless-steel wire mesh. The top of the pre-pack slotted well screen <br /> will be outfitted with 3/4-inch diameter Schedule 40 PVC blank well casing to the ground surface. <br /> Groundwater samples will be collected from the temporary well casing using disposable <br /> polyethylene tubing attached to a peristaltic pump. Groundwater from the tubing will be <br /> decanted into laboratory-supplied sample containers, labeled and placed in an insulated cooler <br /> chilled with ice and transported to K Prime, Inc. of Santa Rosa, California, a CDPH ELAP <br /> certified laboratory pursuant to ASTM D 4840 chain-of-custody protocols. The groundwater <br /> samples will be analyzed for the suite of chemicals presented in Table 3-1. Groundwater <br /> samples for VOC analysis will be collected into laboratory-supplied 40-milliliter vials and <br /> capped with zero headspace. <br /> 5 <br /> 5/11 <br /> I <br />