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4-2 <br /> S13-10, and SB-12 Soils in these locations appear to be impacted from 4 to 18 ft-bgs (bot- <br /> tom of the borings) Detection of BTEX constituents and observed gray staining of soil sam- <br /> ples from Borings SB-11, SB-13, SB-14, and MW-6 appear to be attributed to the migration <br /> of constituents along the top of the saturated zone The position of the top of the saturated <br /> zone is affected by the normal seasonal fluctuation of the water level <br /> 4 2 SOIL - FORMER BRINE DISCHARGE AREA <br /> Analyses of soil samples collected from the former brine discharge area indicate that hexa- <br /> valent chromium, lead, cadmium, selenium, and silver were not present in detectable concen- <br /> trations Chromium was detected in each soil sample with the highest concentrations (49 <br /> mg/kg) detected at depths of 8 to 10 ft-bgs Chromium concentrations detected in the soil <br /> samples are below the Total Threshold Limit Concentration (TTLC) value for chromium of <br /> 2,500 mg/kg4 and the anticipated background concentration Shacklette and Boerngen5 re- <br /> port the estimated arithmetic mean concentration for chromium in sods of western United <br /> States is about 56 mg/kg Barium, arsenic, and mercury were detected in relatively low con- <br /> centrations, which did not exhibit any discernable pattern in their occurrence The TTLC <br /> values for banum, arsenic, and mercury are 10,000 mg/kg, 500 mg/kg, and 20 mg/kg, re- <br /> spectively ' None of the concentrations for these metals exceed their respective TTLC <br /> values <br /> r <br /> Concentrations of ammoma in soil were highest at the ground surface and decreased with <br /> ' depth The state of California has no applicable regulatory guidelines for ammonia <br /> 4 Barclays California Code of Regulations, Title 22, Section 6626124 <br /> 5 Shacklette, H T and 7 G Boemgen, 1984, "Element Concentrations in Soils and Other <br /> Surficial Materials of the Conterminous United States," U S Geological Survey Professional <br /> Paper 1270, United States Government Office, Washington, D C <br /> 29025 <br /> i <br /> "REALISTIC SOLUTIONS FOR HAZARDOUS WASTE PROBLEMS" <br />