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Case Closure Summary Page 2 <br /> Leakir Tnderground Fuel Storage Tank P: gram <br /> III. Release and Site Characti..:rization 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) 996 1600 17 .072 Xylene 29.8 100 2.8 ND <br /> TPH (Diesel) Ethylbenzene NS 22 1.4 ND <br /> Benzene .102 ND 4.8 ND Oil & Grease <br /> Toluene 6.48 21 .83 .39 Heavy metals <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : Soil sample results are from 10.5 feet depth below <br /> the tank after its removal and following excavation sidewall sample at 8 foot depth. <br /> The bottom excavation samples were low to ND at a depth of 12 foot. Remaining soil <br /> contamination is minimal. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does corrective action protect public health for current land use? (Yes) No <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? (Yes ) No <br /> Monitoring wells Decommisioned: Yes (No) Number Decommisioned: Number Retained: <br /> List enforcement actions taken: NOR 8/15/89 <br /> i <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signature: Date: 5 jp <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: Title: Date: <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency <br /> as part of the official site file. (08/24/93) <br /> Exhibit N Page 2 of 2 <br />