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Case Closure Summary Pao <br /> `.Leaking Underground Fuel Storage Tanks,..,.gram <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) 9100 NA NA NA <br /> TPH(Diesel) 1700 NA NA NA <br /> Benzene .9 NA NA NA <br /> Toluene 91 NA NA NA <br /> Xylene B00 NA NA NA <br /> Ethylbenzene 190 NA NA NA <br /> Oil&Grease NA NA NA NA <br /> Heavy Metals Pb=20 NA NA NA <br /> MTBE <10 NA NA NA <br /> EDB <.2 NA NA NA <br /> Comments: SOIL ONLY. DEPTH TO GROUNDWATER HAS VARIED FROM ABOUT 55 FEET BELOW SURFACE <br /> GRADE (BSG) TO 75 FEET BSG (1978 - 1986 SAN JOAQUIN COUNTY FLOOD MAP). CLAY SOILS. SOIL BEFORE <br /> CONCENTRATIONS FOR TPH GAS & DIESEL, TOLUENE, ETHYLBENZENE, XYLENE ARE FROM SOIL BORING SB4 <br /> AT 15 FEET BSG. BENZENE IS FROM SB 1 AT 15 FEET BSG. LEAD & EDB ARE FROM A SOIL SAMPLE COLLECTED <br /> AT THE TIME OF THE UST REMOVALS. CONTAMINANT CONCENTRATIONS IN THE SOIL DECREASED AT 20 AND <br /> 30 FT BSG. NO REMEDIATION WAS PERFORMED SO THERE ARE NO SOIL AFTER CONCENTRATIONS. A WELL <br /> SURVEY WAS COMPLETED AND IT STATES NO RECEPTORS ARE LIKELY TO BE IMPACTED BY THE <br /> CONTAMINATION. A GROUNDWATER INVESTIGATION WAS NOT PERFORMED <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? YES <br /> Monitoring/Vapor wells decommissioned: 0 Number Decommissioned: 0 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO Title: SUPERVISING REHS, SITE MITIGATION UNIT <br /> Signature: -fi g Date: ( a n—1 1, <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: MARTY HARTZELL Response: <br /> Title: ASSOCIATE ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <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 />