Laserfiche WebLink
I'FerexualINC. <br /> 2.7 Groundwater Sampling and Analytical Results <br /> Each of the four boreholes was extended approximately five feet into groundwater and a <br /> groundwater grab sample was collected through the center of the drilling rod. Samples were <br /> decanted into in Environmental Protection Agency (EPA)-approved containers and submitted to <br /> McCampbell Analytical Laboratories for analysis of TPH-G, TPH-D, BTEX, oil and grease, and <br /> LUFT metals. Analytical results from the groundwater grab samples collected from boreholes <br /> BH-1 and BH-2 reported concentrations of TPH-D at 250 micrograms per liter (µg/L) and 76 <br /> µg/L, respectively. Petroleum hydrocarbons were not detected in grab groundwater samples <br /> from boreholes BH-3 and 131-1-4. Concentrations of TPH-G, BTEX, and oil and grease were not <br /> detected in groundwater grab samples collected from the four boreholes. Trace concentrations of <br /> dissolved metals were reported in groundwater results. The detected metal concentrations are <br /> below DHS MCLS for drinking water. The analytical results for the groundwater samples are <br /> summarized in Table 1, and a complete copy of the laboratory analytical results and project <br /> chain-of-custody documents are included in Appendix E. <br /> 3.0 CONCLUSIONS <br /> The results of the soil sampling conducted during Versar's investigation conducted on <br /> May 16, 1997, indicate the groundwater down gradient of the former automobile repair facility <br /> contains low concentrations of diesel-range petroleum hydrocarbons and metals. Metals detected <br /> in the groundwater at the Site are below the MCLS for drinking water. The absence of <br /> constituents of concern in boreholes BH-3 and BH-4 suggests that the low hydrocarbon <br /> concentrations are of limited extent in the Site area. Metal concentrations in the soil samples are <br /> consistent with the USGS's published background levels for the area. <br /> 4.0 REFERENCES <br /> State of California, Department of Water Resources Quality Assurance Technical Document 3. <br /> Compilation of Federal and State Drinking Water Standards and Criteria. July 1995. <br /> United States Geological Survey (USGS) Professional Paper 1270. Element Concentrations in <br /> Soil and Other Surficial Materials of the Conterminous United States. 1984. <br /> Versar, Inc. Phase 1 Environmental Site Assessment Bank ofAmerica- Ripon Branch No. <br /> 0852, 234 West Main Street, Ripon, California. April 24, 1997. <br /> 1,\13AMCAMER\PHASEIMPONW PON.FL 4 <br />