ARCHIVED REPORTS_XR0012524 - Laserfiche WebLink

Home Browse Search

i 05 May 1997 AGE-NC Project No 95-0173 Page 2 of 29 six soil borings (B1, B2, MW-1 through MW-4) near the former UST area to maximum depths of 60 feet bsg, borings MW-1 through MW-4 were converted into 2-inch diameter PVC ground water monitoring wells Concentrations of total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, respectively) and volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTE&X)were detected in both soil and init)al ground water samples collected from B1, B2 and MW-1 through MW-4 Analytical results ' of soil and ground water samples are summarized in Table 1 and Table 2 On 19 and 20 December 1996, site assessment activities included advancing six soil probe ' borings(B3 through B8)downgradient of the former UST area to maximum depths of 40 feet bsg Concentrations of TPH-g, TPH-d and BTE&X were detected in soil samples collected from B3, B4 and B6 Analytical results of soil samples are summarized in Table I Concentrations of TPH-g, TPH-d and BTE&X were detected in grab ground water samples collected from B3, B4, B6 and B7, ground water samples were not collected from B5 and B8 Analytical results of grab ground water samples are summarized in Table 3 • On 16, 17 and 18 June 1997, five ground water monitoring wells (MW-5 through MW-9) and two soil vapor extraction wells (VW-1 and VW-2) were installed on and off-site as part of site assessment activities Substantial concentrations of TPH-g, TPH-d and BTE&X were detected in soil samples collected from MW-6, VW-1 and VW-2, concentrations of TPH-g, TPH-d and BTE&X were detected in initial ground water samples collected from MW-6, MW-8 and MW-9 Analytical results of soil and ground water samples are summarized In Table I and Table 2 • On 14 July 1997, an eight-hour soil vapor extraction (SVE) pilot test was performed to ' provide data to assess SVE as a component of the final remedlat)on system Analytical results of vapor samples collected during the pilot test are summarized In Table 4, field measurements collected during the SVE pilot test are summarized In Table 5 • On 3 and 4 November 1997, two in-situ air sparging (lAS) wells (AW-1 and AW-2) were dual completed at the site to delineate the vertical extent of petroleum-impact and to serve as remediation wells Substantial concentrations of TPH-g, TPH-d and BTE&X were detected in soil and initial ground water samples collected from AW-I and AW-2 Analytical results of soil and ground water samples are summarized in Table I and Table 2 • On 13, 14 and 15 January 1998, a 72-hour IAS pilot test was performed to assess feasibility of IAS as a remediation technique Field measurements collected during the IAS pilot test are summarized in Table 6 I Additional background information is summarized In Quarterly Reports submitted to PHS-EHD (prepared by AGE) between August 1996 and January 1998 Advanced CeoEnvironmental,Inc