ARCHIVED REPORTS XR0000697 - Laserfiche WebLink

Home Browse Search

i . 31 August 2005 AGE-NC Project No 96-0232 Page 2 of 30 County Environmental Health Department(SJCEHD)in May 1993 during repairs and/or upgrades to the UST vent line system, as a result, the SJCEHD directed that a subsurface investigation be performed beneath the UST area A copy of the UAR is in Appendix B In a letter dated 16 February 2000, the RWQCB notified all responsible parties for the Flag City Chevron facility(Bokides Family Ltd Partnership,First Investment Flag City Inc and Flag City Ltd Partnership)that the RWQCB would assume the regulatory lead from the SJCEHD due to the high MT'BE concentrations detected at the site and due to the MTBE detections from the Rocky's Restaurant domestic water well In order to expedite the investigation and cleanup of the MTBE plume, the RWQCB issued Cleanup and Abatement Order No 5-00-700, dated 01 March 2000 (Appendix C) There are currently two, separate ongoing leaking underground storage tank(LUST) investigations being performed near the Flag City Chevron site The first LUST site is identified as the Three B's Truck Plaza(14749 North Thornton Road)and is located approximately 200 feet west-northwest of the Flag City Chevron site (Figure 3), the Three B's Truck Plaza facility is utilized for commercial and retail fueling, and general commercial truck repairs and is under a SJCEHD directive to investigate former leaking USTs that were removed from the site circa 1998 The second LUST site is identified as New West Petroleum(6437 West Banner Avenue)and is located approximately 300 feet north-northeast of the Flag City Chevron site (Figure 2), New West Petroleum is utilized for retail fueling and is under a SJCEHD directive to investigate petroleum-impacted ground water identified on Banner Avenue 21 PRELIMINARY SITE ASSESSMENT It is our understanding that due to a potential change in the property and business ownership,three ground water monitoring wells (MW-1, MW-2 and MW-3)were installed at Flag City Chevron on 02 and 03 May 1991 near the former UST and fuel dispensing areas as part of a preliminary environmental site assessment All three wells were drilled to a depth of 24 feet below surface grade (bsg), and completed with perforated casing at depths between 9 and 24 feet bsg Soil samples collected at depths of 5 feet and 15 feet from all three wells during drilling,none of the analyzed soil samples detected any petroleum hydrocarbon constituents of concern Between 1991 and 1993, seven ground water monitoring events were performed at the site on wells MW-1,MW-2 and MW-3 Generally,groundwater levels were encountered at depths between 9 and 13 feet bsg, ground water flow direction was typically reported towards the northwest at gradients of 0 002 ft/ft or less Dissolved petroleum hydrocarbons were not detected during the initial May 1991 ground water samples, however benzene was subsequently detected from well MW-1 during the May 1993 event at a concentration of 16 micrograms per liter(µg/1)and from well MW-3 during Advanced GeoEnvironmental,Inc