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i <br /> THIRD QUARTER,2002 <br /> GROUNDWATER MONITORING REPORT <br /> JAMAR OIL DISTRIBUTION <br /> NOVEMBER 2002 <br /> Samples were collected from each momtonng well using new disposable bailers Groundwater <br /> samples were analyzed for TPH G, BTEX, 1,2-DCA,EDB and fuel oxygenates using EPA <br /> Methods 8015 Modified and 8260B,respectively The analyses were conducted by Sparger <br /> Technology, Inc of Sacramento, California, a California State certified laboratory, in accordance <br /> with state guidelines and EPA protocol Copies of the laboratory reports with COC <br /> documentation are included in Appendix B The analytical data are summarized in Figure 5 and <br /> m Table 2 <br /> SUNEViARY <br /> Groundwater Flow and Gradient <br /> Based on depth to groundwater measurements taken on September 26, 2002, the depths to <br /> groundwater range from 65 46 feet below ground surface (bgs) in monitoring well MW-I to <br /> 65 97 feet bgs in MW-4 All groundwater elevations were measured to the nearest 0 01-feet <br /> relative to the surveyed top of casing elevation The elevations are based on the survey <br /> conducted by JPCA on August 30, 2000 The survey on August 30, 2000 was completed by <br /> setting the comer of the cement sidewalk on the southeastern corner of the store as the <br /> benchmark with an assumed elevation of 30 feet Based on the surveyed casing elevations and <br /> the measured depth to water on September 26,2002,the groundwater elevations range from <br /> -37 46 feet in MW-4 to -37 21 feet in MW-1 <br /> The direction of groundwater flow has been calculated to be trending outh 42 a ith a <br /> hydraulic gradient of approximately 0 002-feet/feet across the site as sho on Figure 4 <br /> Calculated groundwater elevations are summarized in Table 1, and shown on Figure 4 <br /> Groundwater Analytical Results <br /> TPH G was detected in samples from all wells, except MW-5, this quarter at concentrations <br /> ranging from.76,000 micrograms per liter(4ig/1) in the sample samples from MW-1,to 20,000 <br /> µg11 in the sample from MW-2 TPH G was ND in MW-5 <br /> TPH D was detected in wells MW-I through MW-4 this quarter at concentrations ranging from <br /> 4,100µg/l in the sample from MW-I to 750µg11 in the sample from MW-2 <br /> 4 Benzene was detected in samples from wells MW-1 through MW-4 at concentrations ranging <br /> from 29,000µg/1, in the sample from MW-1,to 6,900µg/l in the sample from MW-4 Toluene <br /> was detected in samples collected from MW-2,MW-3 and MW-4 at 270µg/1, 70µg11,and 390 <br /> • µg/1, respectively <br /> 4 <br />