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Site Assessment Report <br /> 1022 Frontage Road <br /> C A M B R I A Ripon, California <br /> December 16, 2005 <br /> Waste Disposal Soil cuttings and waste water generated during drilling activities were <br /> drummed and stored onsite On December 1,2005,investigation derived <br /> waste was transported by Evergreen Environmental Services to the <br /> Evergreen 011,Inc disposal facility in Newark,California Waste disposal <br /> documentation is presented in Appendix I <br /> 5 0 INVESTIGATION RESULTS <br /> p�l <br /> 51 Petroleum Hydrocarbon Distribution in Soil kre <br /> 0'S° o <br /> During the recent investigation, petroleum hydrocarbons (pnmanly diesel range hydrocarbons)and <br /> fuel oxygenates(MTBE and TBA)were detected in soil samples collected from Boring B-18,located <br /> approximately 15 feet west of the former UST cavity Low concentrations were only detected above <br /> the groundwater table at 16 and 21 ft bgs Petroleum hydrocarbons(diesel range hydrocarbons)and <br /> fuel oxygenates(MTBE and TBA)were also detected in soil samples collected during the installation <br /> of Well AS-1,located 25 feet southwest of the former UST cavity Low concentrations were detected <br /> directly above and beneath the groundwater table at 21 and 26 ft bgs No petroleum hydrocarbons or <br /> fuel oxygenates were detected in soil samples collected from well MW-10,located 120 feet southwest <br /> of the former UST cavity Soil analytical results are presented in Table 1 Figure 4 contains soil <br /> analytical results from the current investigation <br /> Subsurface soils have been impacted by diesel,and to a lesser extent gasoline and MTBE,and appear <br /> to be related to release(s)from the former fuel USTs,former fuel dispensers and related piping,and <br /> the former waste oil UST and related piping The main source area is the area surrounding the former <br /> USTs and southern end of the former dispensers No petroleum hydrocarbons or fuel oxygenates were <br /> detected in boring B-18 at 36,46,and 51 ft bgs indicating that soil is vertically delineated in the main-tet, -s <br /> source area The main source area is delineated laterally by borings B-81hrough B-15,MW-2 through f <br /> MW-5, <br /> -8,MW-10,and Ripon Farm Services borings * 14 and* 16 Additional assessment is PL <br /> need to determine the extent of TPHd impacted soil fated to the f rmer waste oil UST pipin <br /> mple W04) � de! <br /> 0�s <br /> 52. Petroleum Hydrocarbon Distribution in Groundwater <br /> 1-1 S40AIIL- dra4,gn 01 <br /> During the recent investigation,) MTBE concentrations were detected in well MW-10 located 120 <br /> Sfeet southwest of the former US cavity Highly anomalous analytical results were detected during <br /> multilevel groundwater sampling of hydropunch boring B-18, located approximately 15 feet west of <br /> 9 <br />