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Wm. J. Hunter & Associates 2220 Loma Vista Dr Registered Geologists Sacramento, CA 95825 Petroleum &Mineral Appraisers (916) 972-7941 4PFAX (916) 972-1683 REPORT COVERING RESULTS OF PLACEMENT OF MONITORING WELL#4 Marci's Diesel Service 2959 Loomis Road, Stockton, CA Site Code 2015 PURPOSE OF WORK: Prior work at this site (removal of two UST's and placement of 3 monitoring wells and one soil bonng,) revealed that soil and groundwater contamination exists beneath the site of the removed tanks MW-2 & MW-3 have never recorded any contamination in either soil or water samples MW-1 has recorded minor amounts of benzene and xylene in water samples from three of the sampling events, TEPH as diesel was detected in four amplings, and TPH as gasoline in only one Soil samples from MW-1 recorded minor amounts of toluene, ethylbenzene, xylene, & TPHd from 36' bgl to 77'bgl However, a soil boring (LB-1) placed in the center of the site of the removed tanks measured high levels of TPH as gasoline& diesel from 31'bgl to 7 P bgl, and lesser amounts at 77' & 80' bgl Based upon an analysis of all of the data, our firm requested site closure, (refer to WJH report titled "Results of 11/27/1996 Groundwater sampling and Request for Closure" dated January 9, 1997 for details However, the San Joaquin Co EHD did not approve closure and required an additional monitoring well be placed at the site A copy of that correspondence is attached as EXHIBIT A. Monitoring well #4 was placed on September 4, 1997, this report covers the results of that work PROPERTY LOCATION & ADDRESS: The property is located at the south end of the City of Stockton, a short distance west of Highway 99 The address is 2969 Loomis Road PROPERTY OWNER: Marci's Diesel Service, 2973 Loomis Road, Stockton RESPONSIBLE PARTY: John& Margaret Marci, (209) 772-9148 LEGAL DESCRIPTION: 1