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1 <br /> 30 March 1999 <br /> AGE-NC Project No 96-0263 <br /> Page 4 of 7 <br /> I <br /> ether [TAME] and tertiary butanol [TBA]) in accordance with EPA Methods 8260 and 8260- <br /> Modified, respectively <br />' 3 5 LABORATORY ANALYSES OF GRAB WATER SAMPLES <br />' Grab water samples were analyzed for <br /> • TPH-g in accordance with EPA Methods 8015 Modified, <br />' • Volatile aromatic hydrocarbons (BTEX) in accordance with EPA Method 8020 and <br /> • Oxygenated compounds (DIPE, ETBE, MTBE, TAME and TBA) and volatile organic <br />' compounds (VOCs) in accordance with EPA Methods 8260 Modified and 8260 <br /> 4.0. FINDINGS <br /> Descriptions of soil samples encountered in the borings are presented on the boring logs included <br /> in Appendix A The site stratigraphy was inferred from the logged data The results of the laboratory <br />' analysis were reported to AGE by MAI in reports dated 07 July 1998 The reports are included in <br /> Appendix B <br />' 41 STRATIGRAPHY AND DEPTH TO GROUND WATER <br />' Silty clay with a gray color was encountered from a depth of approximately 5 feet to 15 feet bsg <br /> Gray gravel was encountered at depths of 15 and 20 feet bsg An additional layer of gray and tan <br /> silty clay was encountered at a depth of 25 feet bsg in soil boring B5 Groundwater was encountered <br />' at a depth of ten feet bsg A stratigraphic cross section of the UST area is depicted in Figure 3 <br /> 4 2 HYDROCARBON-IMPACTED SOIL <br />' TPH-g was detected in nine of fifteen soil samples analyzed from seven of the soil probe borings <br /> TPH-g was detected at concentrations as high as 670 mg/kg(B4-5') TPH-g was detected in soil from <br /> depths greater than 10 feet bsg at concentrations up to 240 mg/kg (135-12) TPH-g was not detected <br /> in soil samples collected at depths of 20 feet and 25 feet bsg <br /> Advanced GeoEnvironmental,Inc <br />