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Site Background Canepa's Car Wash,Park Street Page 8 of 8 The average depth to groundwater in the monitor wells was 26 47 feet below the surveyed well collar measuring points on July 15, 2005, which indicated an average groundwater elevation 0 63 foot higher than measured during the previous quarter The groundwater elevation contours indicated that the groundwater gradient was variable across the site, but generally toward the north Quarterly groundwater monitoring activities were conducted on October 7, 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 5 mg/L and 47 mg/L, respectively Laboratory analytical results indicated that MTBE was detected in the groundwater samples collected from MW-3, MW-4, MW-6, and MW-7 at concentrations of 1 0 µg/L, 0 6 pg/L, 2 2 µg/L, and 0 9 µg/L, respectively MTBE was not detected at or above elevated detection limits of 5 0 µg/L and 100 µg/L in the groundwater samples collected from MW-2 and MW-5, respectively The average depth to groundwater in the monitor wells was 27 01 feet below the surveyed well collar measuring points on October 7, 2005, which indicated an average groundwater elevation 0 54 foot lower than measured during the previous quarter The groundwater elevation measured on October 7, 2005, in monitor well MW-3 appears to be anomalous and may be a result of a potential calculation/equipment error or malfunction, the data point for MW-3 was consequently not used in average groundwater elevation calculations The groundwater elevation contours indicated that the groundwater gradient was variable across the site, but generally toward the north Quarterly groundwater monitoring activities were conducted on January 17, 2006 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, MW-3, and MW-5 at concentrations of 7 mg/L, 0 073 mg/L, and 42 mg/L, respectively Laboratory analytical results indicated that MTBE was detected in the groundwater samples collected from MW-6 and MW-7 at concentrations of 2 1 µg/L and 1 1 µg/L, respectively MTBE was not detected at or above elevated detection limits of 5 0 µg/L and 100 pg/L in the groundwater samples collected from MW-2 and MW-5, respectively The average depth to groundwater in the monitor wells was 26 48 feet below the surveyed well collar measuring points on January 17, 2006, which indicated an average groundwater elevation 0 81 foot higher than measured during the previous quarter The groundwater elevation contours indicated that the groundwater gradient was variable across the site, but generally toward the north P 12000_prj12038 Canepa Park12038C Canepa Park\Reports\Reports12038C Canepa's April 2006 2nd gmr\Site Background for 2Q06 doc