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Section 4 • 0 Field Procedures <br /> • Date and time of sample collection <br /> ■ Parameters of analysis <br /> ■ Sampler's initials <br /> Boring identification scheme for each sample will consist of the boring location (As shown on Figure 2, <br /> e.g. 5a)and the sample depth(e.g. 0-4). The full boring identification will be 5a-0-4. <br /> All four-point samples will be individually stored in re-sealable plastic bags, and stored in a cooler with <br /> ice for transport to the analytical laboratory. Immediately after sampling, chain of custody forms will be <br /> completed and will accompany the sample coolers to the laboratory. <br /> 5.1.5. Grab Groundwater Sample Collection <br /> Grab groundwater samples will be collected from three piezometers installed at the Site (Figure 2) and <br /> composited at the analytical laboratory for characterization of excavation discharge water. The polyvinyl <br /> chloride (PVC) casing will consist of 10 feet of solid PVC riser from the ground surface to 10 feet bgs <br /> and 5 feet of 0.010-inch slotted PVC screen from approximately 10 to 15 feet bgs. Grab groundwater <br /> samples will be collected using disposable bailers as soon as the temporary piezometer has been installed. <br /> Groundwater samples will be placed in the appropriate sample container, labeled for identification <br /> including boring designation and time of sampling, logged onto the chain of custody form, and stored in a <br /> cooler with ice for transport to the analytical laboratory. As stated previously, groundwater samples will <br /> be analyzed for contaminants as dictated by the City of Stockton Municipal Utilities Department once a <br /> discharge permit has been obtained for remedial construction activities. <br /> 5.1.6. Soil Boring Abandonment <br /> All soil boring locations will be abandoned following soil and grab groundwater sampling. Each <br /> borehole will be inspected immediately prior to abandonment, and any obstructions will be removed. <br /> Each borehole will be filled with cement-bentonite grout, proceeding upward from the bottom of the <br /> boring. The grout will be placed by methods that prevent freefall, bridging, and dilution of sealing <br /> materials. The grout will be placed in one continuous operation(or pour), unless field conditions dictate <br /> that operations be conducted in a staged manner. No drill cuttings will be used to backfill the boreholes. <br /> Water used to prepare grout mixtures will be from a clean,uncontaminated water source. <br /> \kon-ts0l\Pojects\2D08_Pnojectst2M78 City of Stockton Soil Excavationt6.Onginals5-moing and Analysis Plan\Stockton_SAP_Draft_062408_bh.doc 404 <br /> 5-3 <br /> ERRG <br />