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Woolsey Oil Cardlock Page 2 <br /> 1501 W. Charter Way, Stockton. <br /> Case Closure Summary <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 Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPN (Gas) *470. +<40. 4.5 0.170 Ethylbenzene *0.23 +0.26 0.019 <0.0005 <br /> TPH (Diesel) *5200. +380. 21. 0.680 Xylene *0.080 +1.2 0.022 <0.0005 <br /> Benzene *<0.02 +<0.2 0.007 <0.0005 MTBE *0.16 +0.88 2.6 .300 <br /> Toluene *0.03 +0.86 0.009 <0.0005 <br /> Comments: Soil samples from B2-11 in Oct'98. No bottom sample collected in same area after June 1999 over-ex events. <br /> +Results from two separate over-excavation events in June 1999 soil samples with "WCE" designation. Groundwater data <br /> from MW-3, Feb«August 2000 events. <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 wells installed: 5 Number Decommissioned: 5 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director of Environmental Health Department <br /> Signature: Date: 6[P .9-0)o <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: March 15, 2010 Response Date: April 14, 2010 <br /> RB Staff: James L.L. Barton Response: concurrence to closure <br /> Title: Associate Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Mi/ <br />