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x,11 •1 <br /> C A M B R I A Ms Vicki McCartney <br /> • May 17, 2005 <br /> RECOMMENDATIONS <br /> Groundwater samples from all wells have been analyzed for ethylene dibromide and e q� � <br /> 1,2-dichloroethane for over one hydrologic cycle, and neither has been detected to any of the 0M <br /> wells Therefore, Cambria recommends that these analyses be discontinued In our �� ,� <br /> October 7, 2004 Site Conceptual Model (SCM), Cambria recommended reducing the sampling <br /> frequency of wells MW-1 through MW-6 and MW-10 to annual We will implement these ' <br /> changes with San Joaquin County Environmental Health Department's (SJCEHD�'`s) concurrence , <br /> beginning with the second quarter 2005 sampling event `��� a �! <br /> �P 4 C 1 <br /> In our SCM, Cambria also recommended drilling four additional cone penetration test borings If 1r I <br /> v.1 <br /> SJCEHD concurs with this recommendation, we will submit a work plan further detailing these <br /> activities �� r <br /> HISTORICAL REMEDIATION SUMMARY �� �,� <br /> eA soil vapor extraction (SVE) system operated at this site from September 1992 to <br /> November 1996 During this time, the SVE system removed approximately 17,628 pounds of <br /> vapor phase total petroleum hydrocarbons as gasoline from the subsurface 1 <br /> 2 <br />