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• 26 Soil and Ground«ater E i,aluations 2.6 I AASF Areas of concern identified at the AASF comprise the condition of groundwater in the area of the forrnei 5,000-gallon fuel USTs removed in 1990, and a minor release of fuel to soil occurring in April 2002 Figure 3 shows the layout and boring locations at the AASF One boring (B28) was used to assess the impact to soil from a restricted release of fuel to soil (approximately 5 gallons, impacting an area of appioxnnately 20 square feet) The boring was advanced through the area of soil impact to a depth of 46 feet bgs A total of four soil samples and one grab-groundwater sample were collected fioin the boring The soil and groundwater samples were analyzed for TPH-g, TPH-d, TPH-j, BTEC; and five fuel oxygenates tertiary butyl alcohol (TBA), MTBE, di-isopropyl ether (DIPE) ethyl tertiary butyl ether (ETBE), and tertiary amyl methyl ethei (TAME) by EPA method 8260E Tluee groun&Aater monitoring wells associated with the former 5 000-gallon USTs were sampled on March 8, 2004 Prior to sampling each well was purged of approximately three casing volumes of groundwater, and the water level allowed to iecovet to at least 80 percent of the purge level Temperature, pH, dissolved oxygen, turbidity, and electrical conductivity measui ements were made at five-gallon inters als Groun&N ater samples were analyzed fol . TPH-g TPH-d. TPH-j, BTEX and five fuel oxygenates A detailed description of the groundwater sampling is included In the draft Site Investigation Report foi the Arnnv Aviation Support Facility (Veisat, 2004) 2.6 2 CSl\IS Areas of concern identified at the CSMS aie, petroleum hydrocarbons beneath the vehicle wash rack in the north portion of the building elevated Metals and petroleum hydrocarbons along the north facility boundary, petioleurn hydrocarbons near the waste storage aiea, heavy metals near the sandblasting aiea, and pavement upwellrng in the vehicle storage area east of the building Figure 4 shows the layout and boring locations at the CSMS One soil boring (B29) was advanced north of the velucle wash rack located inside the north bay of the CSMS building The boring was advanced to a depth of 45 feet Four soil samples and one grab-groundwater sample were collected from the boring The soil and gioundwater samples were analyzed for TPH as hydraulic oil (TPH-ho) and polychlonnated biphenyls (PCBs) Discrete soil samples were collected at ten locations along the north boundary drainage ditch At each of the ten locations, samples were collected at intervals of 0-0 5 feet, 1-1 5 feet and 3-3 5 feet bgs All samples were tested for total concentrations of 17 heavy metals (CAM 17 list) using EPA 6000 and 7000 series methods, as well as TPH-d, motor oil (TPH-nio) and TPH-j by EPA method 8015 104700 4766 2301085EPT2004 6