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10 June 1998 AGE-NC Protect No 95-0101 Page 2 of 8 In anticipation of future cleanup requirements, a four-inch diameter, slotted PVC casing was installed around the bottom of the excavation Slotted casing was used on the northem and southern sides of the excavation and blank PVC was used on the eastern and western sides Blank piping was installed vertically to the surface and extended to a point behind the northern corner of the building Approximately 5 inches of pea gravel were placed in the excavation to cover the piping Plastic sheeting was placed over this gravel, and three 10,000-gallon USTs were installed over the plastic sheeting In late March 1990 23 SOIL BORING AND MONITORING WELL INSTALLATION Four ground water monitoring wells (MW-1 through MW-4) were installed by AGS in June of 1987 to investigate the hydrocarbon impact on soil and ground water Total volatile hydrocarbons (TVH) were detected in soil samples from MW-2 at concentrations as high as 50 51 pants per million (ppm) TVH were detected in soil samples from MW-1 and MW-3 at concentrations less than I ppm Petroleum hydrocarbons were not detected in the soil sample analyzed from MW-4 Monitoring well installation was summarized in a l 3 July 1987 report prepared by AGS Fiom 11 January to 17 January 1994, four soil borings were advanced at the site b GeoloC7mca1 Audit g Y Services, Inc (GAS) Borings MW-5 and MW-6 were advanced to a depth of 85 feet below surface grade (bsg) and were completed as ground water monitoring wells Borings B7 and 138 lveme advanced to a depth of 65 feet bsg and were backfilled over the entire bored interval ,Kith portland cement Petioleum hydrocarbons were not detected in any of the 14 soil samples collected and analyzed from the borings or monitoring wells The monitoring well installations were summarized in a Quarterly Report -Janua,y 1994 prepared by GAS On 10 April 1995, two soil borings (139 and 1310) were advanced on the site Boring B9 was advanced to a depth of 75 feet bsg, boring B 10 was advanced to a depth of 80 feet bsg Organic vapor was detected in soil samples collected from boring B9 at depths ranging from 25 feet bsg to 70 feet bsg and at concentrations as high as 646 ppm Organic vapor and/or hydrocarbon odor were not detected In samples collected from boring BIO Sample 139-35 contained 9,100 ppm total petroleum hydrocarbons quantified as gasoline (TPH-g), 1 8 ppm benzene, 15 ppm toluene, 48 ppm ethylbenzene and 430 ppmn total xylenes Benzene and xylenes were each detected in sample 139-45 at a concentration of 0 006 ppm Petroleum hydrocarbons were not detected in any other soil samples analyzed from boring B9 Grab ground water samples were collected from the bottom of borings B9 and B 10 TPH-g was detected in the water sample collected from boring B9 at a concentration of 300 ppb Xylenes were . the only analyte detected in the water sample from boring B 10, and were detected at a concentration of 0 83 ppb AdrancedGeoEn.3ronmcnlal,Inc