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' Site Backgiound Information R M B Garage (Erardi Ventures) . Page 3 of 4 ' TPH- TPH-d g, , and TPH-mo were detected in the soil samples collected from borings B1 through ' B4 at concentrations ranging from 0 38 milligrams per kilogram (mg/kg) to 8,100 mg/kg TPH-g, 400 mg/kg to 5,500 mg/kg TPH-d, and 200 mg/kg to 9,200 mg/kg TPH-mo Total recoverable petroleum hydrocarbons (TR-PH) were detected in the soil samples collected from borings BI through B4 at concentrations as high as 36,000 mg/kg(B4-30) One or more of the volatile aromatic compounds benzene, toluene, ethylbenzene, and xylenes (BTEX) were detected in the samples collected from borings B 1 through B4 (with the exception of the 15-foot soil sample from 133) at 1 concentrations as high as 45 mg/kg benzene, 630 mg/kg toluene, 150 mg/kg ethylbenzene, and 760 mg/kg total xylenes(134-30) Seven additional volatile organic compounds were detected in the soil samples at concentrations ranging from 0 010 mg/kg to 440 mg/kg Fuel additives were not ' detected at or above laboratory reporting limits in the soil samples TPH-g and TPH-d were detected in the ground water samples collected from borings B 1 through B4 at concentrations as high as 5,400,000 micrograms per liter (µg/l) (Bl) and 390,000 gg/l (134) TPH-mo was detected in the ground water sample collected from boring B2 at a concentration of 12,000 µg/1 BTEX compounds were detected in the same samples at concentrations as high as ' 210,000 gg/l benzene, 540,000 lig/l toluene, 630,000 gg/l ethylbenzene, and 3,820,000 µg/1 total xylenes (B3) Oil and grease were detected in the samples collected from B1, B2, and B3 at • concentrations as high as 1,500,000 gg/l(B3) BTEX compounds were detected in the ground water ' samples at concentrations as high as 8 5 µg/1 benzene, 150 µg11 toluene, 120 µg/1 ethylbenzene, and 1,300 gg/I total xylenes Seven additional volatile organic compounds were detected in the ground ' water samples at concentrations ranging from 2,100 µg11 to 2,000,000 gg/l Fuel additives were not detected at or above laboratory reporting limits in the ground water samples I On 04, 05, and 25 September 2003, soil borings MW-1 through MW-4 and B5-60 were advanced at the site Pilot borings MW I through MW3 and B5 were advanced using a CME-75HT dnll ng equipped with 8 25-inch diameter hollow-stem augers, the drill rig and three-man crew were ' supplied by Mitchell Drilling Environmental Pilot boring MW4 was advanced using a limited- access drill ng(LAR)equipped with 8 25-inch diameter hollow stem-augers,the LAR and three-man crew were supplied by Cascade Drilling IBorings MW-1 through MW-4 were drilled to a depth of 40 feet bsg for completion as ground water monitoring wells Boring B5 was drilled deeper in order to define the vertical extent of soil and ground water contamination The planned total depth of boring B5 was 70 feet bsg, as requested by the EHD in their approval letter, however a maximum depth of only 60 feet bsg could be achieved due to the presence of heaving sands Pilot borings MW-1 through MW-4 were completed as ground water monitoringwells using two-Inch diameter Schedule 40 PVC casing with 0 020-inch slotted screen installed from approximately 20 feet to 40 feet bsg in all four borings, with blank casing extended to the surface The filter pack (No 3 Lonestar sand) was installed from approximately 22 feet to 40 feet bsg A nominal 2-foot bentomte chip plug was installed above the filter pack and hydrated The wells were Advanced GeoEnvironmentaI,Inc.