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Clayton <br /> EK wk -rNTk <br /> 1\ 4 <br /> 4.3 GROUNDWATER SAMPLE ANALYSES <br /> Groundwater samples were collected from monitoring well MW-3B. Analytical results <br /> revealed gasoline, B`170 , diesel, and total petroleum hydrocarbons were below <br /> detection levels. The results of the laboratory analysis are in Appendix E <br /> 5 0 CONCLUSION, <br /> We did not detect total recoverable hydrocarbons in the soil samples collected from <br /> BH-1, BH-2, BH-3, BH-4, and BH-5 <br /> Reanalysis of the MW-3B soil sample revealed oil and grease, diesel, and <br /> hydrocarbons at 4 feet below ground surface However, we did not detect these <br /> constituents in the soil samples taken from any of the five boreholes at the 4-foot <br /> interval These constituents do not leach easily from soils, and analysis of <br /> groundwater samples from MW-3B did not reveal detectable concentrations. Because <br /> the analysis of soca samples from the adjacent boreholes has demonstrated the limited <br /> extent of the constituents in the surrounding soils, Clayton recommends no further soil <br /> remediation at the subject site. <br /> Granite Construction located and dectroyed the remaining septic tank during road <br /> construction. This was confirmed by Clayton and Mr Obvera. <br /> On April 25, 1992, Ms Hinson requested one additional quarterly water sampling of <br /> monitoring well MW-3B before she will recommend site closure to the Regional <br /> Water Quahty Control Board. <br /> . On May 2, 1991, Clayton conducted the additional quarterly water sampling of <br /> monitoring well MW-3B. Concentrations of total petroleum hydrocarbons in the <br /> water samples were below detection levels. <br /> Therefore, Orchard Supply Hardware requests San Joaquin Count} Public Health <br /> Services recommend site closure to the Regional Water Quahty Control Board <br /> _4- <br /> aaso4Gcrp <br />