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17 June 2008 <br /> AGE-NC Project No. 9 9-063 7 <br /> Page 2 of 3 <br /> sample was transferred into respective sets of three 40-m1 volatile organic analysis (VOA) vials <br /> without a sample preservative. After collection, the samples were properly labeled, placed in a <br /> chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories <br /> (CTEL), a California Department of Public Health (CDPH)-certified analytical laboratory, for <br /> analysis. The samples were analyzed for: <br /> • Fuel additive methyl tertiary-butyl ether(MTBE), in accordance with EPA Method 8260B. <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 25 March 2008. The fuel additive (MTBE) impact to ground water was quantified from the <br /> laboratory analysis of the ground water samples. <br /> 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the March 2008 sampling event, depths to ground water ranged from 14.21 feet to <br /> 16.30 feet below the tops of the well casings. Ground water elevations at the site ranged from <br /> 18.13 feet above mean sea level(MSL)in wellMW-10 to18.22 feet above MSL in wells MW-1 and <br /> MW-2(Table 1).Ground water elevations at the site averaged approximately 18.17 feet above MSL, ' <br /> showing an elevation increase of approximately 1.84 feet,since the December 2007 monitoring event. ' <br /> Ground water was inferred to be flowing generally west-northwest,away from the former UST area, ' <br /> at an average gradient of 0.0007 foot per foot(ft/ft). Figure 3 illustrates the contoured ground water <br /> elevations as measured on 25 March 2008. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES ; <br /> No analytes were detected in the March 2008 ground water samples. The analytical results of the <br /> ground water samples are summarized in Tables 2 and 3. The laboratory report (CTEL Project <br /> Number:0803223),quality assurance/quality control report,and chain-of-custody form are included <br /> in Appendix B.GeoTracker confirmation numbers 4181540310 and 2181643426 confirm the upload <br /> of the submitted depth to water and laboratory electronic deliverable format (EDF) files to the ! <br /> Geotracker system. <br /> I <br /> Advanced GcoEnvironmental,Inc. <br /> I <br />