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YeCase Closure Summary Pag <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 (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 2600 FPPH <.05 Xylene 340 FPPH <.0005 <br /> TPH(Diesel) NA NA NA Ethylbenzene 58 FPPH <.0005 <br /> Benzene 11 FPPH <.0005 Oil&Grease 1000 FPPH NA <br /> Toluene 110 FPPH <.0005 Heavy Metals Pb16 NA <.0005 <br /> MTBE NA 2.160 <br /> I <br /> Comments: Soil Before results are from the UST removal samples in July 1993. Soil samples were not collected and <br /> analyzed after remediation. Groundwater Before and After results are from MW-3 near the former UST location (source <br /> area)which had free phase petroleum hydrocarbons (FPPH)on 1/23192 and was non detect on 312105. Soil excavation and <br /> soil vapor extraction/air sparging removed 3,617 pounds of gasoline during remediation. Less than 1 pound of gasoline <br /> mass is estimated to remain beneath the site and will continue to degrade over time. <br /> i <br /> I <br /> i <br /> IV. Closure <br /> f <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 Pian?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?Yes <br /> Monitoring/Vapor wells decommissioned: No Number Decommissioned: 1 Number retained: 23 <br /> 1 <br /> List enforcement actions taken: NOR sent to RP <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS/Site Mitigation/LOP Unit IV <br /> Signature: ` per Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <br /> Title: Eng. Geologist j <br /> VII. Additional Comments, Data, etc. <br /> i <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 />