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N) N <br /> The groundwater table has been above the top of all well screens since the August 1996 monitoring event <br /> The average depth to groundwater in the monitor wells was approximately 26 86 feet below the surveyed <br /> well collar measuring points on October 17, 2002 The groundwater elevation contours indicated that the <br /> groundwater gradient was generally toward the northeast, consistent with previously reported <br /> groundwater gradients The average groundwater elevation decreased by approximately 1 60 feet since <br /> July 5, 2002 <br /> Quarterly groundwater monitoring activities were conducted on January 13, 2003 The laboratory <br /> analytical results for the groundwater samples collected from MW-1, MW-4, MW-6, and MW-7 indicated <br /> that BTEX constituents were not detected at or above laboratory reported detection limits, but were <br /> detected in MW-2 and MW-5 Benzene was detected in the groundwater samples collected from MW-3 <br /> TPH-G was detected in the groundwater samples collected from MW-2, MW-3, MW-5, and MW-7 <br /> MTBE was detected in the groundwater samples collected from MW-3 and MW-6 When retested using <br /> EPA Method 8260B, MTBE was not detected in MW-2 <br /> The concentration of benzene in MW-2 generally has an inverse relationship with groundwater elevation. <br /> In contrast, benzene concentrations in MW-5 have generally increased as the groundwater elevation has <br /> increased Concentrations of MTBE in MW-6 have ranged from < 0 5 to 23 µg/L over time and was <br /> below California EPA's maximum contamination level (MCL) of 13 micrograms per liter (µg/L,) for <br /> January 2003 Low concentrations of MTBE have continued to be present in groundwater samples <br /> collected from MW-3 (7 2 pg/L for January 2003) It is possible that the Iow concentrations of MTBE <br /> represent background concentrations since they are at the up-gradient extent of the site <br /> The groundwater table has been above the top of all well screens since the August 1996 monitoring event <br /> . The average depth to groundwater in the monitor wells was approximately 26 86 feet below the surveyed <br /> well collar measuring points on January 13, 2003, the same as the previous quarter The groundwater <br /> elevation contours indicated that the groundwater gradient was generally toward the northeast, consistent <br /> with previously reported groundwater gradients <br /> P 12038 Canepa Park12038 Canepa Park\Quarterly Monitonng Reports12003 ApriMite Background 04-2003 doc <br />