ARCHIVED REPORTS XR0007681 - Laserfiche WebLink

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1} Mr H Knoll June 23, 1999 • Page 2 storage tanks (USTs) are not being used by the store and that the exact location of the USTs is uncertain due to the fill plates no longer being visible Copies of these letters and memo are in Appendix A An environmental assessment conducted in September 1990 also documents that these tanks were not bung used and that there were no fill plates visible or vents lines on the exterior of the building as shown in the architectural plans In December 1990, the BFS facility ceased operation and the store was closed permanently The remaining tanks and hoists were removed in April 1991, documented in two separate reports by Ryan Murphy, Inc Three USTs remain closed in place within the sidewalk along El Dorado Street. A total of twelve USTs were removed from the EFS site Impacted soil was encountered during tank removal activities near Tank 5 Soil remediation was conducted in the vicinity of former Tank 5 using a vapor extraction system The remediation system operated from November 1994 until May 1995 Based on the site information, SJCPHS-EHD granted site closure in November 1995. In May 1997, a site investigation was completed as part of a property transfer The . property transfer site investigation was conducted in the vicinity of the closed in place Tanks 1 through 3 Two of the four slant borings drilled during this investigation had detectable concentrations of petroleum hydrocarbons. Total petroleum hydrocarbons (TPH) was detected in slant borings PB1 and PB2 at approximately 18 feet below ground surface (bgs) located east of tanks 2 and 3 Soil samples were not analyzed for methyl-butyl ether (MTBE) or other oxygenates Groundwater was stated in the report as having not been encountered, however in the table of analytical results, soil classification for sample PB2A25 is listed as silty sand wet _OST Investigations In December 1998, QST drilled two borings BFS-1 and BFS-2 Boring BFS-1 was drilled approximately 7 feet east of Tank 2 and Boring BFS-2 was drilled approximately 13 feet to the south of Tank 3 Petroleum hydrocarbons were not detected in soil samples analyzed from Borings BFS-1 and BFS-2 indicating that impacted soil is limited to the area beneath the tanks Soil samples were also analyzed for MTBE and other oxygenates and these constituents were not detected in the soil samples Temporary wells were installed in the bonngs to obtain groundwater samples Groundwater was encounter at different depths in the borings and therefore the groundwater samples possibly reflected different water beanng zones In Boring BFS- 1, groundwater was sampled at 28 feet TPH, benzene, toluene, ethylbenzene and total • xylenes (BTEX), MTBE and other oxygenates were detected in the groundwater sample collected from Boring BFS-1 TPH, BTEX, MTBE and other oxygenates were not