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30 August 2006 <br /> AGE-NC Project No. 99-0637 <br /> Page 2 of 4 <br /> allowing the wells to achieve a minimum 80%recovery�f..the pre-purge water volume. Eachwater <br /> j. sample was transferred into three 40-m1 volatile organic analysis (VOA) vials without a sample. <br /> preservative. After collection, the samples were properly labeled,placed in a chilled container and <br />'r transported under chain of custody to McCampbelI Analytical Inc.(MAI), a California Department <br /> of Health Services (DHS)-certified analytical laboratory, for analysis. The samples were analyzed <br /> for: <br /> Fuel additives including methyl tertiary-butyl ether(MTBE),di-isopropyl ether(DIPE), ethyl <br /> tertiary-butyl ether (ETBE), tertiary-amyl metol ether (TAME), tertiary butanol (TBA), <br /> ethylene dibromide (EDB): and.1,2-dichloroetliane (1,2-DCA) in accordance with EPA <br /> r Method 8260B. <br /> r <br /> -3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 25 May 2006.The fuel additive(MTBE)impact to ground water was quantified from the laboratory <br /> r; analysis of the ground water samples.' I . <br /> F <br /> 3.1. GROUND WATER GRADIENT AND FLOW(DIRECTION <br /> At the time of the May 2006 sampling event,depths to griound water ranged from 12.94 feet to 15.00 <br /> feet below the tops of the well casings..Ground water elevations at the site ranged from 19.41 feet <br /> above mean sea level (MSL) in well MW-8 to 19.52-feet above MSL in well MW-2 (Table 1). <br /> Ground water elevations at the site averaged approximately 19.46 feet above MSL showing an <br /> elevation increase of approximately 1.4 feet since the last monitoring event. <br /> Ground water flow was inferred to be flowing generally toward the northwest,away from the former. <br /> UST area at an average gradient of 0.0007 ft/ft..- Figure 3 illustrates the contoured ground water <br /> ` elevations as measured on 25 May 2006. <br /> 3.2. ANALYTICAL RESULTS OF GROUNDWATER SAMPLES <br /> No analytes, including MTBE .were detected in the May 2006 ground water samples. <br /> The analytical,results of groundwater samples are summarized in.Tables 2 and-3.-The laboratory <br /> report (MAI Work Order No.0605565), QA/QC report and chain of custody form are included in <br /> Appendix B. GeoTracker confirmation pages of the.submitted laboratory electronic deliverable <br /> Advanced GeoEuvironmcntal,Inc. <br /> n <br /> I <br />