ARCHIVED REPORTS_2015 SITE INVESTIGATION WORK PLAN

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• X 21 July 2015 AGE Project No. 14-3154 Page 3 of 15 as 0.014 mg/L, copper as high as 0.018 mg/L, nickel as high as 0.018 mg/L, vanadium as high as 0.073 mg/L and zinc as high as 0.049 mg/L from all grab groundwater samples. The four groundwater samples were non-detect for VOCs, SVOCs, PCBs, PAHs and fuel range hydrocarbons. On 20 and 21 April 2015, a physical evaluation of the waste handling area was conducted and soil trenching on the waste management area footprint was conducted to evaluate the limits of waste buried and provide for additional soil sampling. Figure 3 depicts the locations and designations of the trenches. Trenches were established to depths of five feet or six feet bsg at some locations, with the use of an excavator and soil was piled adjacent to the trenches. Soil was noted to cover all the waste discovered at the site, a minimum of two feet of clean soil was encountered over the waste glass and native silty soil was observed under the waste glass at each location. Work was conducted under the oversight of the SJCEHD - LEA. At the direction of the SJCEHD, soil samples were collected at a minimum of five foot intervals from the native soil under the waste glass; and a soil sample was collected from each soil pile within the waste glass area. Soil was analyzed for the following: • Petroleum hydrocarbons • Volatile organic compounds (VOCs) • Semi-volatile organic compounds (SVOCs) • Poly nuclear aromatic hydrocarbons (PNAs) • pH and CAM 17 metals analysis Trenching soil samples were non-detect for the organic chemicals of concern. Soil with detections of metals, were below the California Human Health Screening Level concentrations and detected consistently at concentrations near the background concentration established for the site by samples analyzed from borings AB12, AB13, A1314, A1315. Soil pile samples were also were non-detect for the organic chemicals of concern. Soil pile samples with detections of metals, were below the CHHSL concentrations and detected consistently at background metals concentrations. Advanced GeoEnvironmental,Inc.