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14 August 2000 AGE-NC Project No. 98-0492 Page 2 of 8 2:2. . UNDERGROUND STORAGE TANKREMO�AL On 18 February 2000, one 8,000-gallon diesel UST, Ione 8;000-gallon gasoline UST,-and one 10,000-gallon gasoline UST,were removed from the sit by Environmental Control Industries, Inc., (ECI).Krazan&Associates;Inc.was present to observe Peld_activities and collect soil samples. The approximate locations of the former-USTs are shown obi Figure 2. Soil samples were collected-beneath the fanner USTs�t a depth of 15.5 feet below surface grade (bsg), beneath the dispenser islands at 2 feet bsg and om the stockpiled soil excavated from the UST excavation.'Soil samples were analyzed for total petroleum hydrocarbons quantified as gasoline .(TPH-g),total petroleum hydrocarbons quantified as diesel (TPH-d), volatile aromatic compounds (benzene,.toluene, ethylbenzene and total xylenes; BT X), five fuel oxygenates and total lead. The three USTs were located at the cast end of the site: wring the UST removal, a total of six soil samples, two from beneath eachUSTwere collected fro the floor of the UST excavation. A total of three soil samples, one from beneath each dispenser land and one from between the dispenser islands, were collected. Also; two four-part composite samples were collected from the eight-soil stockpiles. TPH-g was reported in soil samples S-7 and.S-9 colleted from beneath each dispenser island at. concentrations of 2.4 milligrams per kilogram (mg/kg) d 2.1 mg/kg..Beiizene was detected in soil sample S-7.at a concentration-of 0.0065 mg/kg:Methyl�rtiary butyl ether(MTBE)was detected in soil samples S-7 and S-9 at concentrations of 4:5 mg/kg Od 4.3 mg/kg.A summary of soil analytical results are presented in Table 1. 2.3. PREVIOUS SUBSURFACE INVESTIGATIOI�s It is our,understanding that a previous subsurface investigation was performed in 1993,Two soil borings and three ground water monitoring well were dif filled and sampled at the site. According to Ms. Pontes,- no hydrocarbon-impacted soil or ground ,water were encountered during the investigation. However,AGE was not provided with codes of the report of previous investigation for review. . In October 1998,AGE advanced six soil borings at the 4te to'determine if petroleum hydrocarbons ti had impacted the soil and ground water at the site. Soil 7and ground water samples were analyzed for . TPH-g, TPH-d, BTEX compounds; and the five fuel oxygenates. None of the target,analytes were detected above laboratory reporting limits in any of tht samples analyzed."TPH,d4as detected in the ground water samples collected from P-2 and P-5 at concentrations of 1201.iicrograms per liter (yg/1) and 2,000 ygll, respectively. Methyl tertiary+butyl ether (MTBE) was detected at a - Advanced GeoEnvironrnental,Inc.