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<br /> Site Background
<br /> Canepa's Car Wash,Park Street
<br /> Page 5 of 7
<br /> BTEX constituents were not detected at or above laboratory reported detection limits in those samples
<br /> BTEX constituents were detected at low concentrations in the samples collected from MW-1 and MW-3,
<br /> at moderate concentrations in the sample collected from MW-2, and at relatively elevated concentrations
<br /> in the sample from MW-5 TPH-G was detected in MW-1, MW-2, MW-3, and MW-5, at concentrations
<br /> Of 0 11, 5 5, 0 2, and 48 mg/L, respectively
<br /> Laboratory analytical results indicated that MTBE was detected at concentrations of 8 8 and 55 }ig/L in
<br /> the groundwater samples collected from MW-1 and MW-2, respectively MTBE was not detected at or
<br /> above an elevated detection limit of 1,000 tig/L in the groundwater sample collected from MW-5
<br /> Because the result for the MW-2 sample was inconsistent with histoncal results and the detection limit for
<br /> the MW-5 limit was elevated, the samples were reanalyzed for MTBE by EPA Method 8260B The
<br /> results of the EPA Method 8260B analyses indicated that MTBE was not detected in the samples from
<br /> MW-2 or MW-5 at or above the laboratory reported detection limits of 0 5 and 10 pg/L, respectively The
<br /> laboratory analytical results of the groundwater samples collected on January 28, 2004 were generally
<br /> consistent with historical monitoring results
<br /> The groundwater table remained above the top of all well screens dunng the January 2004 monitoring
<br /> event The average depth to groundwater in the monitor wells was approximately 27 88 feet below the
<br /> surveyed well collar measuring points on January 28, 2004, 0 39 foot shallower than the previous quarter
<br /> The groundwater elevation contours indicated that the groundwater gradient was generally toward the
<br /> northeast, consistent with historical groundwater gradients
<br /> Quarterly groundwater monitoring activities were conducted on May 10, 2004 The laboratory analytical
<br /> results for the groundwater samples collected from MW4, MW-6, and MW-7 indicated that BTEX
<br /> constituents were not detected at or above laboratory reported detection limits in those samples BTEX
<br /> constituents were detected at low 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-1, MW-2, MW-3, and MW-5, at concentrations of
<br /> 0 09, 6 4, 0 13, and 50 mg/L,respectively
<br /> Laboratory analytical results indicated that MTBE was detected at concentrations of 41 µg/L, 16,000
<br /> jig/L, 140 µg/L, and 7,000 µg/L in the groundwater samples collected from MW-1, MW-2, MW-3, and
<br /> MW-5, respectively MTBE was not detected at or above a detection limit of 5 0 µg/L in the groundwater
<br /> samples collected from MW-4, MW-6, and MW-7 Because the results for the MW-1, MW-2, MW-3, and
<br /> MW-5 samples were inconsistent with historical results, the samples were reanalyzed for MTBE by EPA
<br /> Method 8260B The results of the EPA Method 8260B analyses indicated that MTBE was not detected in
<br /> the samples from MW-2, MW-3, and MW-5 at or above the laboratory reported detection limits of 5 0,
<br /> 5 0, and 50 µg/L, respectively MTBE was detected at a concentration of 1 1 lig/L in the groundwater
<br /> sample collected from MW-1 The laboratory analytical results of the groundwater samples collected on
<br /> May 10, 2004 were generally consistent with historical monitoring results
<br /> The groundwater table remained above the top of all well screens dunng the May 2004 monitoring event
<br /> The average depth to groundwater in the monitor wells was approximately 27 30 feet below the surveyed
<br /> well collar measuring points on May 10, 2004, 0 58 foot shallower than the previous quarter The
<br /> groundwater elevation contours indicated that the groundwater gradient was generally toward the
<br /> northeast, consistent with historical groundwater gradients
<br /> Quarterly groundwater monitoring activities were conducted on July 14, 2004 The laboratory analytical
<br /> results for the groundwater samples collected from MW-4, MW-6, and MW-7 indicated that BTEX
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