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FIRST QUARTER, 2003 . GROUNDWATER MONITORING REPORT JAMAR OIL DISTRIBUTION JUNE 2083 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, time, and 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 Groundwater samples were analyzed for TPH G and TPH D using EPA Method 8015 Modified and for BTEX, and the fuel oxygenates MTBE, DIPE, ETBE, TAME, and TBA using EPA Method 8260B. The analyses were conducted by SunStar Laboratories, Inc, of Tustin, 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 are summarized in Table 2 and shown on Figure 5. SUMMARY Groundwater Flow and Gradient • Based on depth to groundwater measurements taken on March 13, 2003, the depths to groundwater range from 63.00 feet below ground surface(bgs)in monitoring well MW-1 to 63.30 feet bgs in MW- 4. All groundwater elevations were measured to the nearest 0.01-foot relative to the surveyed top of casing elevation. The elevations are based on the survey conducted by)PCA on August 30, 2000. The survey on August 30, 2000 was completed by setting the corner of the cement sidewalk on the southeastern comer of the store as the benchmark with an assumed elevation of 30 feet above mean sea level (MSL). Based on the surveyed casing elevations and the measured depth to water on March 13, 2003, the groundwater elevations range from-34.38 feet in MW-5 to -34.79 feet in MW-4. The direction of groundwater flow has been calculated to be trending outh-southe with a relatively flat hydraulic gradient of approximately 0.004-feet/foot acros alculated groundwater elevations are summarized in Table 1, and shown on Figure 5. Groundwater Analytical Results TPH G was detected in samples from monitoring wells MW-1, MW-2,MW-3 and MW-4 this quarter at concentrations of 8,200 micrograms per liter(µg11), 1,100 µg/l, 880 µg/1 and 2,000 µg/l, respectively. TPH G was ND in MW-5. TPH D was detected in the sample from MW-1 at 620 µg/l and was ND in samples from the other wells. 4