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I <br /> Case Closure Summary : Exhibit N Pao of 2 <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <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 i <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 <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: yes Number Decommissioned: 3 Number retained: 0 ` <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Re resentative Data <br /> Name: Donn Bran Title: Director of Environmental Health <br /> Signature: Date: 3- rp3 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: November 18, 2002 Response Date: December 2, 2002 <br /> RB Staff: Marty Hartzell Response: Concurrence with closure. No further action is F <br /> Title: Assoc Eng Geologist required. <br /> VII. Additional Comments, Data, etc. <br /> All three remaining monitoring wells have been destroyed by pressure grouting on March 26, 2003 under EHD inspection. <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lea_d agency as part of the <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br /> E <br />