ARCHIVED REPORTS XR0007681 - Laserfiche WebLink

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Mr H Knoll June 23, 1999 • page 4 0 Previously operated a Shell station at this location until 1981 • Increasing levels of MTBE detected in groundwater monitoring wells are purported to be from an offsite source (Arco) These sites in relation to the former BFS facility are shown on Figure 1 There were many more sites identified as having petroleum impacted soil Soil and groundwater samples from some of these sites were never analyzed for MTBE or other oxygenates. Therefore, it is possible that many other sites in the vicinity of the former BFS facility may have MTBE and other oxygenates in the groundwater SUNEVIARY The USTs, which would be the petroleum hydrocarbon source at the former BFS facility have been removed or abandoned in place Gasoline has not been stored at the site since before October 1967 Documents show that the USTs that remained at the former facility until 1991 were not used in any capacity During QST's investigation, petroleum hydrocarbons, MTBE and other oxygenates were not detected in the soil beneath the former BFS facility TPH, BTEX, MTBE and other oxygenates were detected in the groundwater sample collected from Boring BFS- 1. TPH, BTEX, MTBE and other oxygenates were not detected in the groundwater sample collected from Boring BFS-2 The groundwater samples were collected at different depths suggesting separate water bearing zones QST identified at least four sites in the vicinity of the former BFS facility that have detected petroleum hydrocarbons including MTBE and other oxygenates in the soil and groundwater One of the four sites is an Arco Station suspected of having a petroleum hydrocarbon release, which has impacted the soil and groundwater of other properties. Other sites in the area formerly had USTs and impacted soil, however were closed and never tested for MTBE or other oxygenates CONCLUSIONS The on-site source of petroleum hydrocarbons was eliminated in 1967 when BFS discontinued the use of the USTs that stored gasoline and closed the tanks in place Documents show that the USTs that remained at the former BFS facility until 1991 were not used in any capacity The use of MTBE as a gasoline additive did not begin in the United States until 1979, 12 years after BFS discontinued the use of the tanks and the tanks were closed . The petroleum hydrocarbons in the soil at the former BFS facility identified by the property transfer site assessment, appear to be limited to beneath Tanks 2 and 3, based