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Site Background
<br /> Canepa's Car Wash,Park Street
<br /> Page 6 of 6
<br /> constituents were not detected at or above laboratory reported detection limits in those samples BTEX
<br /> constituents were detected at Iow concentrations in the samples collected from MW-1 and MW-3, at
<br /> moderate concentrations in the sample collected from MW-2, and at relatively elevated concentrations in
<br /> the sample from MW-5 TPH-G was detected in MW-2, MW-3, and MW-5, at concentrations of 6 8,
<br /> 0 067, and 40 mg/L, respectively
<br /> Initial EPA Method 8020 analyses indicated that MTBE was detected in the groundwater sample
<br /> collected from MW-I, MW-2, MW-3, MW-5, and MW-6 at concentrations of 8 7 pg/L, 28,000 pg/L, 100
<br /> µg/L, 32,000 pg/L, and 32 pg/L, respectively MTBE was not detected at or above a detection limit of 5 0
<br /> pg/L in the groundwater samples collected from MW-4 and MW-7 Because the results for the MW-2,
<br /> MW-3, MW-5, and MW-6 samples were inconsistent with historic results, the samples were reanalyzed
<br /> for MTBE by EPA Method 8260B The results of the EPA Method 8260B analyses indicated that MTBE
<br /> was not detected in the samples from MW-2 and MW-5 at or above the laboratory reported detection
<br /> limits of 5 0 and 50, pg/L, respectively MTBE was detected in the groundwater samples collected from
<br /> MW-3 and MW-6 at concentrations of 2 6 pg/L and 5 2 pg/L, respectively The final laboratory analytical
<br /> results of the groundwater samples collected on July 14, 2004 were generally consistent with historic
<br /> monitoring results
<br /> The groundwater table remained above the top of all well screens during the July 2004 monitoring event
<br /> The average depth to groundwater in the monitor wells was approximately 27 91 feet below the surveyed
<br /> well collar measuring points on July 14, 2004, 0 61 foot deeper than the previous quarter The
<br /> groundwater elevation contours indicated that the groundwater gradient was generally in a northerly
<br /> direction, consistent with historic groundwater gradients
<br /> Quarterly groundwater monitoring activities were conducted on October 12, 2004 The laboratory
<br /> analytical results for the groundwater samples collected from MW-1, MW-3, MW-4, MW-6 and MW-7
<br /> indicated that BTEX constituents were not detected at or above laboratory reported detection linuts in
<br /> those samples BTEX constituents were detected at moderate concentrations in the samples collected from
<br /> MW-2, and at relatively elevated concentrations in the sample from MW-5 TPH-G was detected in
<br /> MW-2 and MW-5, at concentrations of 6 3 and 25 0 mg/L, respectively
<br /> EPA Method 8260B analyses indicated that MTBE was detected in the groundwater samples collected
<br /> from MW-1, MW-3, MW-4, MW-6, and MW-7 at concentrations of 0 8 pg/L, 2 2 pg/L, 1 1 pg/L, 5 1
<br /> }tg/L, and 1 0 pg/L, respectively MTBE was not detected at or above a detection limit of 10 0 gg/L in the
<br /> groundwater samples collected from MW-2 and MW-5 The laboratory analytical results of the
<br /> groundwater samples collected on October 12, 2004 were generally consistent with historic monitoring
<br /> results
<br /> The average depth to groundwater in the monitor wells was approximately 29 08 feet below the surveyed
<br /> well collar measuring points on October 12, 2004, 1 17 foot lower than the previous quarter The
<br /> groundwater elevation contours indicated that the groundwater gradient was generally in a northerly
<br /> direction, consistent with historic groundwater gradients
<br /> • P 12000_prj\2038 Canepa Park120385 Canepa Park\Quarierly Monitoring Reports12005 January\Site Background 01-2005 doc
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