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07 March 2002 <br /> AGE-NC Project No 99-0645 <br /> Page 6 of 9 <br /> well to ensure that a minimum of 80% of the well volume had recharged Water samples were <br />' collected from each well using a new disposable plastic bailer Each water sample was transferred <br /> into three chilled 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid <br /> (18%) as a sample preservative After collection, the samples were labeled and placed in a chilled <br />' container for transportation under chain-of-custody to MAI Each sample was analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel(TPH-g and TPH-d)by EPA <br />' Method 8015 Modified for each molecular range of hydrocarbons, <br /> • Benzene, toluene, ethylbenzene and total xylene (BTEX) by EPA Method 8020 and <br /> • Oxygenated fuel additives-MTBE,tertiary butyl alcohol(TBA),di-isopropyl ether(DIPE), <br /> ethyl tertiary butyl ether(ETBE)and tertiary amyl methyl ether(TAME),ethanol,methanol, <br /> ethyl-dibromide (EDB) and 1,2- dicholorethane (1,2-DCA) In accordance with EPA <br /> methods 8260 Modified <br /> rThe results of the ground water sample laboratory analysis are presented in Section 4 3 <br />' 4 0. FINDINGS <br /> Soil in the area of boring B 1[MW-1] and locally borings B4 and B5 was found to contain high <br /> concentrations of petroleum hydrocarbons at depths of 15 bsg, with reduced concentrations <br /> encountered at depths to 70 feet bsg Ground water was inferred to have a northeasterly flow <br /> direction and was found to be locally impacted by the oxygenated fuel additive MTBE <br /> 1 41 STRATIGRAPHY AND DEPTH TO GROUND WATER <br /> Silty sand and poorly graded sand with a tan or gray color, apparently depending on hydrocarbon <br /> impact,was generally encountered from a depth of approximately 15 feet to 30 feet bsg Gray to tan <br /> silt was present at depths above 15 feet bsg, between 30 and 75 to 80 feet bsg and generally below <br /> 80 to 85 feet,across the site Sand was encountered at depths of 75 and 80 feet bsg in the monitoring <br /> well soil bonngs Ground water was encountered at a depth of 95 feet bsg during drilling Soil <br /> borings are depicted in Appendix A A stratigraphic cross section is depicted in Figure 3 and <br /> impacted soil is depicted in Figure 4 <br /> ' Advanced GeoEnvironmental,Inc <br />