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VIRONMENTAL HEA LTFI DIVISION FOOTHILL <br /> 304 E.Weber Ave. Third Floor ENGINEERING <br /> P. O. Box 388, Stock CA 95201-0388 1 793 PADDY CREEK LANE LODI. CA 95240 <br /> Approved H. <209) 368-9381 FAX (209) 367-1163 <br /> Denied ❑ <br /> Conditions <br /> April 28, 9 Modified @ the request of C. Oz 5/12/99 <br /> Ms. Carol <br /> San Joaquin County u ervices <br /> Environmental Health Division <br /> R O. Box 388 <br /> Stockton, CA 95201 <br /> �10ie& <br /> Site Code 41038 <br /> q0& ub ect: Michael D. & Sharon Olivarez, <br /> � j 300 S. California St. Stockton, Ca. <br /> Work Plan for CPT Borings to Determine Lateral & Vertical Extent of Contamination <br /> SuXt nom' <br /> Dear Ms. Oz, <br /> As per your request of March 19, 1999, please find below a Work Plan for additional borings, <br /> la,�d hydrology survey, soil and water sampling for the above stated site. <br /> WORK PLAN FOR CPT BORINGS and MONITORING WELL REPLACEMENT <br /> Site History <br /> Five fuel USTs and one used motor oil tank were removed by Jim Thorpe Oil in November 1992 <br /> S under permit from the PHS/EHD. Soil samples taken from under the USTs and dispensing <br /> equipment indicated the presence of hydrocarbons. Spoil from the excavation was found to contain <br /> P� hydrocarbon contamination. <br /> Clearwater Group submitted a Work Plan to install three soil borings with monitoring wells <br /> constructed in the same boring. The work described in the Clearwater Work Plan was completed in <br /> PW March of 1995. <br /> f The excavation for the removal of the USTs was backfilled by Jim Thorpe Oil in April 1996. The <br /> excavation spoil was used for backfill material. <br /> C, {° <br /> Foothill Engineering was requested by the owner to sample the three monitoring wells that were <br /> 101%,, installed by Clearwater at various times and the analysis of those samples is attached. Monitoring <br /> c� D wells MW-1 and MW-2 continue to contain high levels of gasoline contamination.MW-3 has much <br /> r�(�f�+ lower levels of gasoline contamination(see data sheet attached). <br /> Proposed CPT Borings <br /> The groundwater gradient of the three existing monitoring wells is to the northeast. The proposed <br /> CPT borings are to be placed on a +/-100' radius from the center of the UST excavation. This is <br /> about double the radius of the existing monitoring wells. CPT #1 is located just north of the UST <br /> Page 1 of 3 <br />