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z ' TIHRD QUARTER,2001 GROUNDWATER MONITORING REPORT I ' JAMAR OIL DISTRIBUTION SEPTEMBER 2001 Groundwater Sampling Prior to sampling,the wells were allowed to recharge to a minimum of 80% of their initial static ' water levels Groundwater samples were collected from each well using a new disposable bailer The samples were placed into the appropriate laboratory prepared containers,using proper sample handling and chain-of-custody(COC) protocol established by the USEPA The samples were ' labeled with the date, tune, identifying well number, stored in a cooler at 4' Centigrade or less, and transported to a state certified laboratory under completed COC documentation. ' Groundwater Analyses On July 6, 2001, depths to groundwater were measured from the top of the well casings (TOC) t using an electronic water level indicator The groundwater elevations recorded by GHH are summarized in Table 1 Each monitoring well was purged by pumping at least three well volumes ' of water Conductivity, temperature and pH were monitored while the wells were being purged Purging data were recorded on field data sheets, which are included in Appendix A. Samples were collected from each monitoring well using new Teflon disposable bailers Groundwater samples were analyzed for TPH G, TPH D,BTEX, 1,2-DCA,EDB and oxygenates using EPA Methods 8015 Modified, 8020 and 8260B,respectively The analyses were conducted by Acculabs,Inc of Davis, California, a California State certified laboratory, in accordance with state guidelines and EPA protocol Copies of the laboratory reports with COC documentation are included in Appendix B The analytical data is summarized on Figure 4 and m Table 2 SUMMARY Groundwater Flow and Gradient Based on depth to groundwater measurements taken on July 6, 2001, the depths to groundwater range from 50.26 feet below ground surface (bgs)in monrtormg well MW-1 to 60.53 feet bgs in ' MW-2 All groundwater elevations were measured to the nearest 0 01-feet relative to the surveyed top of casing elevation The elevations are based on the survey conducted by (JPCA) on August 30, 2000 The survey on August 30, 2000 was completed by setting the corner of the cement sidewalk on the southeastern corner of the store as the benchmark with an assumed elevation of 30 feet Based on the surveyed casing elevations and the measured depth to water on July 6, 2001, the groundwater elevations range from-318 3 feet in MW-5 to -32 01 feet in MW- 1 I ' S