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d <br /> CALIFORNIA GEOPHYSICAL GROUP , INC . <br /> P . O . Box 578341 , Modesto, CA 95357 Tel : (209) 527 - 1247 <br /> Fax : (209) 52 7-48 10 <br /> March 11 , 2006 <br /> Environmental Health Department REC yEN � <br /> San Joaquin County <br /> 304 East Weber Avenue Third Floor �p� 7 LUGo <br /> Stockton , CA 95202-2708 <br /> NT <br /> Attn : Mr. Nuel Henderson AkATTISEYMCES HEALTH <br /> Re : Work Plan <br /> Beneto Inc, 749 East Charter Way, Stockton , CA Site No . 1060 <br /> Introduction <br /> The San Joaquin County Environmental Health Department (EHD) has requested a <br /> work plan addressing verification of the CPT results of Soil Boring # 4 drilled on July 20 , <br /> 2005 . The total depth of this CPT was 160 feet. As indicated in the field logs <br /> submitted for this boring , a discrete sand / gravel interval exists at approximately 132 — <br /> 135 feet bgs . The two monitoring wells we now propose will be installed in an effort to <br /> complete several goals. <br /> 1 ) Further define the vertical geology at the site > 100 ftp bgs , and confirm the <br /> vertical extent of the soil / groundwater contamination plume per the initial <br /> findings and analytical results of the CPT completed on July 20 , 2005. <br /> 2) Sampling and assessment of the newly discovered gravel/ sand stratification at <br /> 132 — 135 ft. bgs . <br /> 3) Evaluate if there is a potential for an off-site deep source from the documented <br /> contaminate releases surrounding this site through the sand/gravel interval <br /> at 132 — 135 ft, bgs . <br /> 4) Generate valuable current Geological and Analytical data which will be <br /> incorporated in the requested Feasibility Study for the site. <br /> HISTORY <br /> On November 14, 1989 three tanks were removed at this site and three fiberglass tanks <br /> were installed . The laboratory results taken at the time of removal tested positive for <br /> gasoline hydrocarbon contamination . <br /> On December 19 , 1989 an Electromagnetic Induction Survey was conducted on the <br /> site to aid the investigation of the aerial extent of the contaminated soil and in planning <br /> the position of the monitoring wells. <br /> In January 1990 three monitoring wells were installed . They were reported in our report <br /> dated February 9 , 1990 , <br /> In March and April 1992 , three more monitoring wells were installed . They were <br /> I <br />