ARCHIVED REPORTS_XR0009570 - Laserfiche WebLink

Home Browse Search

Site Background Canepa's Car Wash,Park Street Page 6 of 7 constituents were not detected at or above laboratory reported detection limits in those samples BTEX constituents were detected at low concentrations in the samples collected from MW-1 and 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 6 8, 0 067, and 40 mg/L, respectively Initial EPA Method 8020 analyses indicated that MTBE was detected in the groundwater sample collected from MW-1, MW-2, MW-3, MW-5, and MW-6 at concentrations of 8 7 pg/L, 28,000 µg/L, 100 µg/L, 32,000 µg/L, and 32 pg/L, respectively MTBE was not detected at or above a detection limit of 5 0 µg/L in the groundwater samples collected from MW4 and MW-7 Because the results for the MW-2, MW-3, MW-5, and MW-6 samples were inconsistent with histone results, the samples were reanalyzed 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 5 0 and 50, pg(L, respectively MTBE was detected in the groundwater samples collected from MW-3 and MW-6 at concentrations of 2 6 tig/L and 5 2 gg/L, respectively The final laboratory analytical results of the groundwater samples collected on July 14, 2004 were generally consistent with historic monitoring results The groundwater table remained above the top of all well screens during the July 2004 monitonng event The average depth to groundwater in the monitor wells was approximately 27 91 feet below the surveyed well collar measuring points on July 14, 2004, 0 61 foot deeper than the previous quarter The groundwater elevation contours indicated that the groundwater gradient was generally in a northerly direction, consistent with historic groundwater gradients Quarterly groundwater monitoring activities were conducted on October 12, 2004 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 moderate concentrations in the samples collected from MW-2, and at relatively elevated concentrations in the sample from MW-5 TPH-G was detected in MW- 2 and MW-5, at concentrations of 6 3 and 25 0 mg/L, respectively EPA Method 8260E analyses indicated that MTBE was detected in the groundwater samples collected from MW-1, MW-3, MW-4, MW-6, and MW-7 at concentrations of 0 8 pg/L, 2 2 µg/L, 1 1 pg/L, 5 1 pg/L, and 10 pg/L, respectively MTBE was not detected at or above a detection Iimit of 10 0 p.g/L in the groundwater samples collected from MW-2 and MW-5 The laboratory analytical results of the groundwater samples collected on October 12, 2004 were generally consistent with historic monitoring results The average depth to groundwater in the monitor wells was approximately 29 08 feet below the surveyed well collar measuring points on October 12, 2004, 1 17 foot lower than the previous quarter The groundwater elevation contours indicated that the groundwater gradient was generally in a northerly direction, consistent with historic groundwater gradients Quarterly groundwater monitoring activities were conducted on January 13 and 14, 2005 The laboratory analytical results for the groundwater samples collected from monitor wells MW-1, MW-3, MW-4, MW- 6, and MW-7 indicated that BTEX constituents were not at or above laboratory-reported detection limits in those samples BTEX constituents were detected at moderate concentrations in the sample collected from MW-2, and at relatively elevated concentrations in the sample collected from MW-5 TPH-G was detected in MW-2 and MW-5 at concentrations of 4 3 mg/l and 35 mg/L, respectively