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i <br /> i20 February 2001 <br /> . AGE-NC Project No 99-0559 <br /> iPage 3 of 5 <br /> i <br /> 3.0. FINDINGS <br /> i <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> iThe ground water elevation on 05 January 2001 ranged from 24 93 to 26 11 feet below mean sea <br /> level (MSL) The top of the ground water table occurred within the screened intervals of the wells <br /> i The ground water elevations decreased between this monitoring event and the last monitoring event <br /> in September 2000 in monitoring wells MW-2 and MW-3, however, very little change occurred in <br /> the ground water elevation in monitoring wells MW 1 and MW-4 <br /> iGround water was determined to be flowing to the east-southeast with a hydraulic gradient of 0 017 <br /> feet/feet The ground water contours are depicted on Figure 3 <br /> I <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLE ANALYSIS <br /> i TPH- was detected in the ground waters les collected from all wells at concentrations ranging <br /> g �' g g <br /> i . from 26,000 µg/l in sample MW-1 to 220,000 µg/1 in sample MW-2 <br /> Benzene was detected in all four wells at concentrations ranging 4,700 µg/1 in sample MW-1 to <br /> i 32,000µg/1>n MW-2 The remaining BTE&X compounds ranged fon-n490 µg/1 oftoluene in MW-1 <br /> to 43,000 µg/1 of toluene in MW-2 <br /> i MTBE was detected in all four wells utilizing EPA method 8020 at concentrations ranging from <br /> 4,800 µg/l in MW-1 to 260,000 µg/l in MW2 The MTBE concentrations were by EPA method <br /> 8260B and ranged from 6,500 µg/1 in sample MW1 to 310,000 µg/1 in sample MW-2 The remaining <br /> i fuel oxygenates were not detected in the samples, however, due to necessary dilution of the samples, <br /> the detection limits ranged from 125 µg/1 for TAME, ETBE and TBA in MW-1 to 1,000,000 µg/l <br /> for methanol in samples MW-2 and MW-4 <br />' The analytical results of water samples are summarized in Table 2 The laboratory reports (MAI <br /> Laboratory I D Nos 57427 and 57430), quality assurance and quality control(QA/QC)reports and <br />' chain-of-custody forms are included in Appendix B <br /> i3 3 FREE PRODUCT MEASUREMENTS/REMOVAL/DISPOSAL <br /> During December 2000 and on 05 January 2001, free product thickness measurements and free- <br /> product removal were performed in well MW-2 The current free product thickness was <br /> • approximately 1/2-inch Field data logs and disposal manifest are included with Appendix C <br /> iAdvanced GeoEnvironmen[aL Inc <br /> I <br />