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FOOTHILL <br /> ENGINEERING <br /> 12793 PADDY CREEK LANE LODI. CA 95240 <br /> PH. (209) 368-9381 FAX (209) 367-1163 <br /> February 23, 2000 (addendum 3/17/00) <br /> Ms. Carol Oz <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P. O. Box 388 <br /> Stockton, CA 95201 <br /> Site Code #1038 <br /> Subject: Michael D. & Sharon Olivarez, 300 S. California St. Stockton, Ca. <br /> Work Plan for Additional Deep Monitoring Wells to Determine Lateral & Vertical <br /> Extent of Contamination <br /> Dear Ms. Oz: <br /> As per your request of January 11, 2000, please find below a Work Plan for three additional soil <br /> borings, and the construction of three monitoring wells on the above stated site. <br /> WORK PLAN FOR INSTALLATION OF THREE DEEP MONITORING WELLS <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 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 Plan to install three soil borings with monitoring wells <br /> constructed in the same boring. The work described in the Clearwatei Work Plan was completed in <br /> 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 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#1,MW#2,and MW#3.These replacement wells were installed to <br /> correct an over-screen condition of the existing monitoring wells. Also, included in this work plan <br /> Page 1 of 3 <br />