ARCHIVED REPORTS_XR0005509 - Laserfiche WebLink

Home Browse Search

Based on the results of the soil samples collected from the angled soil boring D-2, the vertical extent of impacted soil appeared limited to shallow subsurface soil The soil sample collected at 14 feet bgs from D-2 only contained a concentration of MTBE of 0 0054 mg/kg The soil sample ' collected at 23 feet bgs from D-2 did not contain detectable concentrations of MTBE, BTEX or TPH-as-gasoline TPH-as-gasoline and BTEX were not detected in either soil sample collected from D-2 Only a concentration of 0 016 mg/kg of MTBE was detected in the soil sample collected at 20 feet bgs from D-1 TPH-as-gasoline and BTEX were not detected in either of the soil samples collected from D-1 These soil sample analytical results are summarized in Table 1 ' On February 12, 1998, under EHD observation, L&M Construction excavated approximately 60 cubic yards of impacted soil from the vicinity of the west dispenser island The depth of the ' excavation ranged from approximately 7 feet near the former dispenser to approximately 12 feet beneath the former underground product distribution piping The excavated soil was stockpiled 1 on site and remediated by passive aeration The approximate extent of the over-excavation is shown on Figure 4 Soil sampling and analysis to confirm the excavation limits were not recorded in the regulatory case file ' On October 1 1998 under EHD observation, Environmental re-sampled the soil stockpile Two soil samples were collected from the accumulated soil stockpile for laboratory composite and analysis The composite soil sample was analyzed for TPH-as-gasoline and BTEX by Modified EPA Method 8020/8015 and for oxygenates by EPA Method 8260 Based on the results of the ' soil sample analyses, EHD allowed the soil stockpile to be spread on-site ' On October 1, 1998, under EHD observation, FGL Environmental also sampled the on-site domestic water well The groundwater sample was analyzed for TPH-as-gasoline and BTEX by Modified EPA Method 8020/8015 and for oxygenates by EPA Method 8260 None of these ' compounds were detected in the water sample Well construction details were not available The results of the domestic well groundwater analyses are summarized in Table 3 On March 25, 1999, Ramage Environmental published Underground Storage Tank Environmental Corrective Action Summary Report documenting the tank removal and subsequent corrective ' actions completed at the site Based on the analytical results from the soil samples collected from beneath the north end of the middle former UST, Ramage Environmental recommended that a ' work plan be developed to evaluate the extent of impacted soil and groundwater 6 1