ARCHIVED REPORTS XR0008631 - Laserfiche WebLink

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REMEDIAL ACTION PLAN 1505 South EI Dorado Street Stockton California petroleum hydrocarbons (TPH), as gasoline, benzene, toluene, ethylbenzene, and total xylenes (BTEX), ethylene dibromide (EDB), 1,2- dichloroethane, and total lead Investigation results were reported by Aegis to Exxon in a "Pre-Tank Replacement Site Assessment Results Report," dated March 5, 1991 TPH and BTEX analytical results are summarized in Table 1 • On July 2 and 3, 1991 , Aegis installed monitoring wells MW-1, MW-2, and MW-3 (Figure 2) Results of the investigation were reported by Aegis to Exxon in a "Phase l Subsurface Investigation Results Report," dated September 13, 1991 Table 2 summarizes TPH and BTEX analytical results from soil sampling • On June 10, 1992, Aegis personnel observed and documented the condition and removal of the three 10,000-gallon UST and associated piping Tank removal and sampling results were reported by Aegis to Exxon in an "Underground Storage Tank Closure Report," dated October 29, 1992 Figure 3 shows the sample locations Table 3 summarizes TPH and BTEX analytical results from soil sampling With concurrence from the San Joaquin County Public Health Services, Environmental Health Division (SJCPHSIEHD), soil removed during excavation activitieswas stockpiled on site and replaced in the excavation in March 1993 • On February 3, 1993, Aegis submitted to Exxon an "Additional Subsurface Investigation Workplan,"proposing on and off-site monitoring wells to further define the extent of petroleum hydrocarbons in groundwater, two vapor extraction wells within the former tank basin for possible future remediation and a vapor extraction test from the wells to evaluate the feasibility of this remediation option • On July 29, 1993, Aegis submitted to Exxon a 'Problem Assessment Report," documenting the results of subsurface soil and groundwater investigation activities conducted by Aegis personnel Monitoring wells MW-4 through MW-6 were drilled to 60 feet below ground surface (bgs), MW-7 to 55 feet bgs, vapor extraction well VEW-1 to 15 feet bgs, and VEW-2 to 45 feet bgs at the locations shown on Figure 2 Vapor extraction well construction details are presented in Appendix A This report assessed the extent of petroleum hydrocarbons in soil (Figures 4, 5, and 7) and groundwater (Figure 10), and discussed remedial action alternatives for the protect site Also, the results of the pilot-scale soil vapor extraction test performed on May 12, 1993, were reported ' 91 044A RAP 2 1