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' Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> I <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations -Before and After Cleanup(tank removal) <br /> Contaminant Soil Soil Water Water Contaminant Soil . Soil Water Water <br /> Before After Before After Before After Before After <br /> (in Ppm) (in ppm) (in ppm) (in ppm) <br /> TPH (Gas) ---- ---- ---- ---- MTBE ---- <br /> TPH(Diesel) 168 ---- .389 ---- Mineral Spirits ---- _--- _--- -__ <br /> Benzene ND ---- .0003 ---- Oil &Grease ---- ---- ..._ ---- <br /> Toluene ND ---- .0011 ---- Heavy Metals ---- ---- _.__ <br /> Ethylbenzene ND ---- .0004 ---- Lead ---- ---- <br /> Xylene ND ---- .0013 ---- <br /> "Soil Before"and "Water Before" results are from the initial Geoprobe soil boring in November 1998, and MW 3 in 1 <br /> December 2001. "Soil After"and "Water After"were not-included since no remediation was implemented. Investigation ) <br /> indicated minimal diesel contamination in the soil and groundwater. Beneficial uses of groundwater are protected, now and <br /> in the future. <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 decommissioned: no Number Decommissioned: 0 Number retained: 3 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHSISite Mitigation/LOP Unit IV <br /> Signature: Date: <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 /> Monitoring wells must be destroyed before final closure. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br />