Laserfiche WebLink
06 January 2006 <br /> AGE-NC Project No 99-0637 <br />' Page 2 of 4 <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(DIPS), ethyl <br /> tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> ethylene dibromide (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br />' Method 8260B <br />' 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 12 August 2005 The MTBE-impact to ground water was quantified from the laboratory analysis of <br /> the ground water samples <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the August 2005 sampling event, depths to ground water ranged from 17 71 feet to <br /> 19 56 feet below the tops of the well casings Ground water elevations at the site ranged 14 55 feet <br /> above mean sea level (MSL) in well MW-6 to 14 99 feet above MSL in well MW-1 (Table 1) <br /> Ground water elevations at the site averaged approximately 14 81 feet above MSL showing an <br /> elevation decrease of approximately 2 56 feet since the last monitoring event <br /> Ground water flow was inferred to be flowing generally toward the southwest,away from the former <br /> UST area at an average gradient of 0 003 ft/ft, and toward the north at an average gradient of 0 011 <br /> ft/ft in the northern portion of the site, in the area of well MW-10 Figure 3 illustrates the contoured <br /> ground water elevations as measured on 12 August 2005 <br />' <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> IMTBE was detected in the sample collected from well MW-4 at a concentration of 30 micrograms <br /> per liter(pg/1) No other fuel additives were detected in the August 2005 ground water samples <br /> The analytical results of ground water samples are summarized in Tables 2 and 3 The laboratory <br /> report (MAI Work Order 0508245), QA/QC report and chain of custody form are included in <br /> Appendix B GeoTracker confirmation pages of the submitted laboratory electronic deliverable <br /> format (EDF) files are included in Appendix C <br /> Advanced GeoEnvironmental,Inc <br />