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08 August 2005 <br /> ., AGE-NC Project No 98-0534 <br /> Page 3 of 15 <br /> UST REMOVAL FINDINGS <br /> 1 <br /> - TPH-d,TPH-g, BTEX and fuel additives were detected in the soli samples collected from the UST <br /> excavations TPH-g and BTEX were detected in four of the UST excavation soil samples and TPH-d <br /> was detected in one of those soil samples analyzed from the UST area <br /> TPH-d was detected at low concentrations in the former dispenser area and in the mid product line <br /> rtrench TPH-g and BTEX were also detected in the mid portion of the product line trench TPH-g <br /> and TPH-d were detected in 16 stockpile soil samples BTEX compounds were detected in eleven <br /> ' stockpile soil samples analyzed `' 1 VC11 <br /> (G5 <br /> Ground water samples analyzed were impacted wi h TPH-g and TPH-d at concentrations up to <br /> 77,000 micrograms per liter(µg/1) and 70,000 µg11, s well as BTEX compounds at concentrations <br /> up to 7,890µg/1 of benzene MTBE was detected at a maximum concentration of 3,100 µg/1 by EPA <br /> method 8020 <br /> rA summary of soil sample analytical results are presented in Tables 1 and 2 A summary of ground <br /> water sample analytical results are presented in Tables 4 <br /> 1 <br /> 23 SITE INVESTIGATION <br /> ' <br /> Based on analytical results of soil samples collected during the UST removals, a preliminary site <br /> investigation was required by the EHD by letter dated 09 March 1999 prior to obtaining a site closure <br /> for the former USTs The following is a brief summary of the site assessment investigations <br /> conducted at the site to date a <br /> • 04 June 1999-two separate excavations were established in the area of the former dispenser <br /> and mid-product line An additional 50 cubic yards of significantly petroleum-impacted soil <br /> was removed and stockpiled on site Excavation dispenser trench (DT) was dug at the <br /> location of southern dispenser, along Navy Drive and trench I (T1) was dug at the location <br /> of a product release in the central portion of the product line trench The total depth of the <br /> DT excavation was nine feet below surface grade (bsg) on the west end and six feet bsg on <br /> ' the eastern end The total depth of the T1 excavation was five feet bsg <br /> Field observations indicated a minor hydrocarbon-impact to soil in the floor of excavation <br /> ' TI Hydrocarbon-impacted soil in the DT excavation was not observed Soil samples were <br /> collected from the DT and the T1 excavation side walls at depths of 3 feet bsg and two soil <br /> samples were collected from floor of the T1 excavation at a depth of fi soil t bsg <br /> gl F2 <br /> was detected at concentrations of 14 milligrams per kilogram(mg/kg) pe TT <br /> (floor sample) and 3 1 mg/kg in soil sample DT-E (east)TPH-d was detected in three soil <br /> ' Advanced GcoEnvlronmental,Inc <br /> t <br />