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Site Background Canepa's Car Wash,Park Street Page 4 of 6 . well collar measuring points on April 4, 2003, approximately 0 25 feet less (greater in elevation) as the previous quarter The groundwater elevation contours indicated that the groundwater gradient was generally toward the northeast, consistent with historical groundwater gradients Quarterly groundwater monitoring activities were conducted on July 10, 2003 The laboratory analytical results for the groundwater samples collected from MW-1, MW-3, MW-4, MW-6, and MW-7 indicated that BTEX constituents were not detected at or above laboratory reported detection limits in those samples BTEX constituents were detected at a moderate concentration in the sample collected from MW- 2, and at relatively elevated concentrations in the sample from MW-5 TPH-G was detected in MW-2, MW-3, and MW-5, at concentrations of 6 2, 0 063, and 49 mg/L respectively Laboratory analytical results indicated that MTBE was detected at a concentration of 400 µg/L in MW-2 and that MTBE was not detected at or above an elevated detection limit of 500 µg/L in the groundwater sample collected from MW-5 Because the result for the MW-2 sample was inconsistent with historical results and the detection limit for the MW-5 sample was elevated, the samples were re-analyzed for MTBE by EPA Method 8260B The results of the EPA Method 8260B analyses indicated that MTBE was not detected in the samples from MW-2 and MW-5 at or above the laboratory reported detection limit of 5 0 µg/L The laboratory analytical results of the groundwater samples collected on July 10, 2003, were generally consistent with historical monitoring results The groundwater table remained above the top of all well screens during the July 2003 monitoring event The average depth to groundwater in the monitor wells was approximately 26 98 feet below the surveyed well collar measuring points on July 10, 2003, 0 37 feet deeper than the previous quarter The groundwater elevation contours indicated that the groundwater gradient was generally toward the northeast, consistent with historical groundwater gradients Quarterly groundwater monitoring activities were conducted on November 6, 2003 The laboratory analytical results for the groundwater samples collected from MW-1,MW-4, MW-6, and MW-7 indicated that BTEX constituents were not detected at or above laboratory reported detection limits in those samples BTEX constituents were detected at a low concentration in the sample collected from MW-3, at moderate concentrations in the sample collected from MW-2, and at relatively elevated concentrations in the sample from MW-5 TPH-G was detected in MW-2, MW-3, and MW-5, at concentrations of 11, 0 14, and 50 mg/L, respectively Laboratory analytical results indicated that MTBE was detected at a concentration of 1,100 µg/L in MW-2 and that MTBE was not detected at or above an elevated detection limit of 1,000 pg/L in the groundwater sample collected from MW-5 Because the result for the MW-2 sample was inconsistent with historical results and the detection limit for the MW-5 sample was elevated, the samples were re-analyzed for MTBE by EPA Method 8260B The results of the EPA Method 8260B analyses indicated that MTBE was not detected in the samples from MW-2 and MW-5 at or above the laboratory reported detection limits of 0 5 and 5 0 µg/L, respectively The laboratory analytical results of the groundwater samples collected on November 6, 2003 were generally consistent with historical monitoring results The groundwater table remained above the top of all well screens during the November 2003 monitoring event The average depth to groundwater in the monitor wells was approximately 28 27 feet below the surveyed well collar measuring points on November 6, 2003, 1 29 feet deeper than the previous quarter The groundwater elevation contours indicated that the groundwater gradient was generally toward the northeast, consistent with historical groundwater gradients Quarterly groundwater monitoring activities were conducted on January 28, 2004 The laboratory analytical results for the groundwater samples collected from MW-4, MW-6, and MW-7 indicated that