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Mr. Ron Rowe CAMBRIA <br /> July 10, 1998 <br /> Access Agreements: Cambria has obtained an access agreement with Mr.Bob Den Dulk,the property owner <br /> of the 333 East Main property to sample and inspect the_well on that property, and install CPT borings on <br /> that property. A copy of the agreement is included in Attachment C. We are pursuing access agreements <br /> with the City of Ripon to install CPT borings in city street right of way,and'are exploring whether an access <br /> agreement is required for the CalTrans well. <br /> Additional Analyses: Cambria will analyze soil and ground water samples for fuel lead scavengers EDB and <br /> EDC by EPA Method 8010 in addition to the analyses outlined in Investigation Work Plan Addendum#3 <br /> until further notice. Proposed detection limits for these chemicals are as follows: EDB - 0.5 µg2, EDC - <br /> 0.5 pg/L. <br /> Historic Ground Water Elevation Research: Cambria-examined historical ground water depth for three <br /> wells in the vicinity of the site that were used to generate the San Joaquin County Flood Control and Water <br /> Conservation District map entitled"Lines of Equal.Depth to Water in Wells"dated Fall 1977. A table of <br /> the wells and their historic high and low elevations follows: <br /> Well Ref. High Date Historic Low Date Historic <br /> j Elev. DTW(ft) Low DTW(ft) High <br /> �J (ft) Elev. (ft) Elev. (ft) <br /> 2S/8E-7RI 64.0 25.5 10/6/92 38.5 18.5 3/6/98 45.5 <br /> 2S/8E-8EI 66.2 35.0 10/6/92 31.2 27.5 3/6/98 38.7 <br /> 2S/7E-26BI 52.0 22.0 3/8/93 30 14.5 3/9/98 37.5 <br /> This data shows that the historic ground water levels vary no more than 15 ft. The depth to water during the <br /> most recent ground water monitoring event was approximately 25 ft bgs. Cambria proposes to use the <br /> sampling and boring scope of work included in the Investigation Work Plan Addendum#3,which proposed <br /> that the CPT borings be completed at approximately 45 ft bgs. <br /> Cambria will continue to pursue more historical depth to water information for other wells in the vicnity of <br /> the site and report the results of the investigation in soiland ground water investigation (SWI)report. <br /> 3 <br />