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• Water samples for heavy metal or inorganic constituents will be sampled as described above <br /> in Section 3.3. <br /> • On-site determinations for pH, conductivity, temperature, and dissolved oxygen will be <br /> conducted at each site. Field observations will be recorded for sample source, width and <br /> depth, turbulence and aeration, suspended or organic material, precipitates or algae, bedrock <br /> geology, vegetation, and possible contaminants. <br /> These surface sampling procedures are designed to: <br /> • ensure that surface water samples are representative. <br /> • ensure that all sample descriptions and field observations are consistent and <br /> accurate. <br /> minimize the risk of cross-contamination between samples. <br /> 3.5 Free Product Monitoring and Sampling <br /> • When present, the free product thickness will be monitored using a clear PVC bailer. The <br /> free product thickness and ground water level will recorded on Well Monitoring forms. <br /> • Any equipment used in wells containing free product will not be used in other wells to <br /> prevent cross-contamination. <br /> All free product removals will be described on Free Product Removal forms. <br /> These procedures are designed to: <br /> • ensure that all free product thicknesses, descriptions, and field observations are <br /> consistent and accurate. <br /> • minimize the risk of cross-contamination to wells without free product. <br /> 3.6 Analytical Procedures <br /> American Geological Services, Inc. will subcontract all analytical work to GeoAnalytical <br /> Laboratories, Inc. in Modesto, California, a state certified analytical laboratory. All analytical <br /> work is monitored to insure that the correct EPA approved methodology is utilized for the <br /> American Geological Services, Inc. <br /> 7 <br />