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4 <br /> < <br /> FOOTHILL <br /> ENGINEERING <br /> 12793 PADDY CREEK LANE LODI. CA 95240 <br /> PH. (209) 368-9381 FAX (209) 367-1163 <br /> Mr. Michael Infurna July 13, 2001 (` �I i� <br /> San Joaquin County Public'Health Services <br /> Environmental Health Division JUL 1 8 2001 <br /> P. O. Box 388 <br /> Stockton, CA 95201 ENVIRONMENT HEALFH <br /> PERMIT/SERVICES <br /> Site Code#1038 <br /> Subject: Michael D. & Sharon Olivarez, 300 S. California St. Stockton, Ca. <br /> Monitoring Well and CPT Installation Report <br /> Dear Mr. Infuma: <br /> Please find below the report covering first quarter monitoring activities on the above stated <br /> property. <br /> FIRST QUARTER 2001 MONITORING WELL SAMPLING REPORT <br /> Site History <br /> Five fuel USTs and one used motor oil tank were removed by Jim Thorpe Oil in November 1992 <br /> under a permit from the PHS/EHD. Soil samples taken from under the USTs and the dispensing <br /> equipment indicated the presence of hydrocarbons. Spoil from the excavation was found to contain <br /> hydrocarbon contamination. <br /> Clearwater Group submitted a Work Pian to install three soil borings with monitoring wells <br /> constructed in the same boring. The work described in the Clearwater Work Plan was completed <br /> in March of 1995. <br /> 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 /> -Foothill Engineering was requested by the owner to sample the three monitoring wells that were <br /> installed by Clearwater at various times and the analysis of those samples is attached. Monitoring <br /> wells MW-1 and MW-2 continue to contain high levels of gasoline contamination.MW-3 has much <br /> lower levels of gasoline contamination (see a recap sheet attached). <br /> On August 23, 1999, the PHS/EHD approved a Work Plan submitted by Foothill Engineering to <br /> install replacement wells for MW#l, MW#2, and MW#3. These replacement wells were installed <br /> to correct the over screen conditions of the existing monitoring wells. Also, included in this Work <br /> Plan was the installation of three CPTs. To date CPT#1, CPT#2 and CPT#3 have been installed. <br /> Soil and groundwater samples extracted during the installation of CPTs indicate gasoline <br /> contamination to a depth of eighty-five feet (see a recap attached). <br /> 1 <br />