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r � r <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil Water <br /> Beforei After2 Before3 After4 Before After) Before After) <br /> TPH (Gas) 590.0 <A <200.0 .060 Ethylbenzene 32.0 <.002 <5.0 <.0005 <br /> TPH (Diesel) NA NA NA NA Xylene 100.0 <,004 11.0 <.0005 <br /> Benzene <20.0 <,001 <5.0 .0007 EDB <2.0 NA NA NA <br /> Toluene 55.0 <,002 18.0 <.0005 Lead 11.0 <.4 0.84 NA <br /> MTBE I NA <,01 NA <.005 <br /> Comments: <br /> 1) Soil sample, #2, collected at 11 feet below ground surface (bgs) at the time of tank removal on 10112188. <br /> 2) Soil sample, SB2, collected at 10 feet bgs on 8/21/97. <br /> 3) Grab groundwater sample, #2, collected at 11 feet bgs at the time of tank removal. <br /> 4) Grab groundwater sample, SB2, collected at 12 feet bgs on 8121197 <br /> An investigation was conducted on August 21, 1997 to determine the extent of the contamination that was evidenced at the <br /> time of tank removal on October 12, 1988. Very limited contamination was subsequently evidenced during the 1997 <br /> investigation. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes. <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes. <br /> Does corrective action protect public health for current land use? Yes. <br /> Site management requirements: None. <br /> Should corrective action be reviewed if land use changes? No. <br /> Monitoring/Vapor wells: None. Number Decommissioned: None. Number retained: None. <br /> List enforcement actions taken: Notice of Reimbursement dated 12/17/96 <br /> List enforcement actions rescinded: None. <br /> V. Local Agency Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: _ Date: _5 <br /> V1. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 12/30/97 Response Date: 1/16198 <br /> RB Staff: Pat Anderson Response: No Further Action Concurrence <br /> Title: Hydrogeologist <br /> VI I. Additional Comments: Jeanne Homsey, Registered Professional Engineer#C047410, with Smith Environmental <br /> Technologies recommended that there be no further action and that the site be granted closure. These recommendations <br /> were based on the following statements. "Analytical results for soil samples are generally consistent with field observations <br /> and PID readings. Based on the analytical results and field observations, the soil beneath the site does not appear to be <br /> impacted by petroleum hydrocarbons. The grab groundwater sample collected from boring SB2 contained benzene and <br /> TPH-g at concentrations slightly greater than their detection limits of 0.5 ppb and 50 ppb respectively. The concentrations of <br /> benzene in the grab groundwater sample from boring SB2 is below the California Primary Maximum Contaminant Level <br /> (MCL) for drinking water of 1.0 ppb for benzene. Boring SB3, located in the.inferred groundwater downgradient direction, <br /> contained no detectable petroleum hydrocarbons. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official <br /> site file. <br />