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Clayton <br /> Exl'iF0\siE\Ti, <br /> CU�SULT.i\TS <br /> 4.3 GROUNDWATER SAMPLE ANALYSES <br /> Groundwater samples were collected from monitoring well MW-3B. Analytical results <br /> revealed gasoline, BTEX, diesel, and total petroleum.hydrocarbons were below <br /> detection levels. The results of the laboratory analysis are in Appendix E. <br /> 5.0. C-ONCIrUSIQN,S AN RECOMMENDATIONS <br /> We did not detect total recoverable hydrocarbons in the soil samples collected from <br /> B14-1, BH-2, BH-3, BH-4, and BH-5. <br /> i <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 constitu;-nts do not leach easily from soils,and ana�ysis of <br /> groundwater samples from MW-3B did not reveal detectable concentrations. Because <br /> the analysis of soil samples from the adjacent boreholes has demonstrated the limited i <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 destroyed the remaining septic tank during road <br /> construction. This was confirmed.by Clayton and Mr. Olivera. <br /> j On April.25, 1991, 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 Quality ControJ 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 /> 1 . <br /> Therefore, Orchard Supply Hardware requests San Joaquin County Public Health <br /> Services recommend site closure to the Regional Water Quality Control Board. i <br /> x <br /> -4- - <br />