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23 August 2021 <br />Project No. 14-3002 <br />Page 2 of 2 <br />GROUNDWATER SAMPLE COLLECTION <br /> <br />Groundwater samples will be collected from approximately 22 of the soil borings. All <br />groundwater samples will be analyzed for TPH. Selected groundwater samples will be <br />analyzed for dissolved lead by EPA Method 200.7 and dioxin and furan by EPA Method <br />E1613. The final work plan will present figures identifying boring locations for lead and <br />dioxin and furan analysis. Proposed boring locations are depicted on Figure 2. <br /> <br /> <br />CONCRETE SAMPLE COLLECTION <br /> <br />Two concrete samples will be collected from the concrete located in the former <br />transformer area in the southwestern corner of the facility. Samples will be collected <br />utilizing a roto-hammer to remove pieces of concrete. The samples will be pulverized at <br />the laboratory to prepare them for analysis. Concrete samples will be analyzed for total <br />PCBs (dry weight) by EPA Method 8082A. Proposed concrete sample locations are <br />illustrated in Figure 2. <br /> <br /> <br />REPORT PREPARATION <br /> <br />Upon completion of the proposed field work, a site assessment/trenching report will be <br />prepared, summarizing this scope of work. Conclusions, applicable recommendations, <br />maps, cross-sections, and an updated conceptual site model will be included in the report, <br />if appropriate. The report will be in a format acceptable to CVRWQCB and will be <br />reviewed and signed by a California Professional Geologist. <br /> <br />If you have any questions or require further information, please contact our office at <br />(209) 467-1006. <br /> <br /> <br />Sincerely, <br /> <br />AdvancedGeo, Inc <br /> <br /> <br /> <br />________________________________ <br />Brian W. Millman <br />Senior Project Geologist <br />California Professional Geologist No. 8574 <br />