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• Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill 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) 5.8 Xylene .47 <br /> TPH(Diesel) 4.8 Ethylbenzene 0.12 <br /> Benzene 0.058 Oil & Grease 460 <br /> Toluene 0.34 Heavy Metals Pb 67 <br /> MTBE X0.05 <br /> Comments: Cleanup not required. Soil After results are from soil samples taken at the time of UST removal or soil boring <br /> samples during the site investigation. Low concentrations of gasoline remains in piping trenches east of former USTs <br /> (8,9,10). Low concentrations of oil and grease remains under former USTs (1,2,3,4,5,6,7) north of service bays. No <br /> detectable contamination was evidence at 15 feet informer gasoline USTs (8,9,10) area. No MtBE was detected in soils <br /> sampled and analyzed at this site. <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: NA Number Decommissioned: Number retained: <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHSISite Mitigation/LOP Unit IV <br /> Signature: J Date: 7 ;L61 a <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: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> Soil only case, ground water was not sampled. <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 />