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Southwest Pond Assessment Work Plan <br /> Lathrop Facility,San Joaquin County,California <br /> 3.3 Surface Soil Sampling <br /> One surface sample will be collected from nearby farmland to assess background conditions. The <br /> background surface soil sample (BG-1) will be collected from farmland located adjacent to the Southwest <br /> Pond at approximately the location shown on Figure 3. <br /> Two surface samples (SS-1 and SS-2) will be collected from the windblown soil in the base of the <br /> Southwest Pond. Staff will observe the texture and color of windblown soil in the base of the pond <br /> and select two locations to collect samples that appear representative of the bulk of the windblown soil. <br /> The approximate locations of the windblown surface samples will be mapped in the field. <br /> The surface samples will be collected using pre-cleaned hand tools and deposited directly into sample jars <br /> provided by the analytical laboratory. <br /> 3.4 Laboratory Analysis <br /> The subsurface and surface soil samples will be transported to a California-certified hazardous waste <br /> laboratory for analysis and methods described below. <br /> Analytet Method' <br /> Sulfate and Nitrate as N EPA 300.0 <br /> Ammonia as N EPA 350.1 <br /> Specific Conductance SM 2510B <br /> Title 22 Metals EPA 6010/7470 <br /> Hexavalent Chromium EPA 3060/7199 <br /> 1. N = Nitrogen <br /> 2. EPA = U.S. Environmental Protection Agency and SM = Standard Method <br /> The waste samples collected from drums will be analyzed for all of the above except specific conductance. <br /> The waste samples will be additionally analyzed for pH by U.S. Environmental Protection Agency Method <br /> 9045. <br /> 4.0 Reporting <br /> Following receipt of sample data from the analytical laboratory, a report summarizing the extent of <br /> affected material will be prepared and will include an evaluation of the feasibility of removing the <br /> materials beneath the asphalt liner.The report will include tabulated sample data, boring logs, and <br /> figures. <br /> 5.0 Estimated Schedule <br /> Simplot anticipates the fieldwork for the assessment will be completed by the end of fourth quarter 2020, <br /> and the a report summarizing the results can be submitted in first quarter 2020, assuming no limitations <br /> are encountered, such as delayed regulatory review of the work plan, inclement weather, regulatory <br /> permitting delays, access issues, and/or driller availability. <br /> • wood. <br />