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r ,I One soil sample was collected from beneath each UST at a depth of 10 to 10 5 feet below ground rsurface (bgs), and analyzed for Total Extractable Petroleum Hydrocarbons (TEPH), Total Volatile Petroleum Hydrocarbons (TVPH), and benzene, toluene, ethylbenzene and xylenes (BTEX) by ' Canonie Environmental Services Corporation Laboratory results indicated that concentrations of petroleum hydrocarbons were detected in the soil samples collected from beneath the northern and central USTs Concentrations of petroleum hydrocarbons included 9,900 milligrams per ' kilogram (mg/kg) TEPH beneath the northern weed oil UST and 18 mg/kg NPH from beneath the central gasoline UST Petroleum hydrocarbons were not detected in the soil sample collected from beneath the southern weed oil UST 1 2 2 Preliminary Investigation and Evaluation 1 On October 12, 1999, Ramage Environmental published Preliminary Investigation and Evaluation Report, which documented the results of sod and groundwater-grab samples collected from five (5) Geoprobe® soil borings (Figure 2) One boring (SB-1) drilled through the northern end of the former UST excavation was continuously cored to a depth of 43 feet Groundwater levels ' measured in each of the soil borings ranged from 18 7 to 21 feet bgs Six soil samples from SB-1, five soil samples from SB-2, SB-3, SB-4 and SB-5, and groundwater- grab samples from all five borings were analyzed for Total Petroleum Hydrocarbons (TPH)-as- ' diesel by modified EPA Method 8015, for TPH-as-gasoline, BTEX, methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME) and tertiary butanol (TBA) by EPA Method 8260B The soil sample collected at 15 feet ' bgs from SB-1 was also analyzed for total lead by EPA Method 6010 The highest concentrations of diesel and gasoline hydrocarbons in sod and groundwater were detected in samples collected from SB-1, located within the former UST excavation i In the soil sample collected at 18 feet bgs from SB-1, TPH-as-diesel was detected at a maximum concentration of 18,000 mg/kg, and TPH-as-gasoline was detected at 1,900 mglkg Vertically, the extent of impacted soil beneath the former USTs was defined to a depth of between 35 and 43 ' feet bgs Laterally, the vertical extent of impacted soil appears to be concentrated between 15 and 25 feet bgs, within the capillary fringe and zone of groundwater table fluctuation Total lead was not detected in the soil sample analyzed The soil sample results from this investigation are ' summarized in Table 1 r 6 1