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CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD <br /> APPENDIX B SUMMARY <br /> Leaking Underground Storage Tank Program <br /> Blease and Site Characterization Information Continued <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanu <br /> Contaminant Sod m Water b Contaminant Soil m Water b <br /> Before After Before" Aftert Before After Before' After <br /> TPH(Gas) 7,000 7,000 130 <50 Xylenes 590 590 95 <0 5 <br /> TPH(Diesel) NA NA NA NA Ethylbenzene 90 90 14 <0 5 <br /> Benzene 3 5 3 5 <05 <0 5 TRPH NA NA NA NA <br /> Toluene 34 34 19 <0 5 TPHmo NA NA NA NA <br /> HVOC's NA NA NA NA MTBE# 1 130 1 0 62 <0 5 <0 5 <br /> Comments(Depth of Remediation etc approximately 60 cubic yards of contaminated sod was excavated from below the western dispenser island The <br /> excavation ranged between 7 to 12 feet below ground surface <br /> ' Before results were detected in grab groundwater samples "After results are based on monitoring well sampling <br /> additional fuel oxygenates, 1,2-DCA and EDB not detected <br /> ' III Closure <br /> 11��-co=letecl corrective action protect existing beneficial uses per the Re conal Basin Plan?YES <br /> s the completed corrective action protect potential beneficial uses per the Regional Board Basin Plan?YES' <br /> IFN tural attenuation is expected to reduce initials detected contaminant concentrations in groundwater to water qualitygoals <br /> Does corrective action pr( <br /> publichealth for current land use? YES <br /> Site mana ement re uirements None <br /> Should corrective action be reviewed if land use changes? Yes X No <br /> Monitoring wells decommissioned O Yes( )No 4 wells to be No Decommissioned No Retained <br /> abandoned riot to site closure <br /> List Enforcement Actions Taken <br /> List enforcement actions rescinded NIA <br /> IV RWQCB Notification <br /> Date Submitted to RB March 14,2003 RB Response <br /> RWQCB Staff Name James Barton Title Date <br /> V Additional Comments Data etc <br /> • <br /> 1 <br />