Laserfiche WebLink
02 June 2004 <br /> AGE-NC Project No 99-0645 <br /> Page 2 of 5 <br /> The compo sited stockpile soil samples contained TPH-g at concentrations ranging from 1,900 mg/kg <br /> to 2,100 mg/kg BTEX compounds ranged from below laboratory detection limits (benzene in <br /> sample SPA-D) to 280 mg/kg (xylenes in sample SPH-L) MTBE, TAME and TBA were detected <br /> as high as 3,000 gg/kg,240 pg/kg and 3,500 A&& respectively Analytical results of soil samples <br /> are summarized on Table 1 <br /> AGE calculated that approximately 126 gallons of gasoline were removed in the soil excavated <br /> during the interim remediation The highest concentrations of petroleum hydrocarbons compounds <br /> left in place were detected in the sample collected from the western wall of the former excavation <br /> Lower concentrations of petroleum hydrocarbons as gasoline were also detected in the floor sample <br /> and samples collected from the north and west sidewalIs Fuel oxygenates,including MTBE,TAME <br /> and TBA were detected in all samples <br /> SITE ASSESSMENT <br /> On 15 through 17 October 2001, six soil borings (B1 through 136) were advanced at the site, three <br /> soil borings, B1 through 133, were established as ground water monitoring wells MW-I through <br /> MW-3, respectively <br /> Soil m the area of boring 131 (MW-1) and borings B4 and B5 were 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 <br /> Ground water monitoring data from the imti al ground water monitoring event on 02 November 2001 <br /> indicated that ground water was flowing towards the northeast, and was locally impacted by the <br /> oxygenated fuel additive MTBE <br /> On 27 September 2002,monitoring well MW-1 was destroyed by drilling out the entire boring length <br /> and backfilling with neat cement and bentonite in the upper 15 feet of the excavation Additionally, <br /> the domestic on-site well was destroyed by percussion explosion and backfilled with a sand and <br /> cement mix <br /> ADDITIONAL SITE ASSESSMENT AND REMEDIATION FEASIBILITY <br /> On 09 through 11 September 2003,a total of seven soil borings were advanced at the site boring 136' <br /> was advanced north of the excavation area at a 20 degree angle, to an extent of 80 feet, 137 was <br /> advanced southeast of well MW-2 to 70 feet bsg, boring MW-IR was installed east of the former <br /> UST area to 100 feet bsg, vapor well VW113 was advanced under the building at a 20 degree angle <br /> • Advanced GenEnvironmentaI <br />