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3 <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> I-II. 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) 1.4 1.4 N/A N/A Xylene .100 .10 N/A N/A <br /> TPH (Diesel) 7600 500 Ethylbenzene [.0026 <br /> Benzene <.0026 <.0026 i Oil & Grease 210 210 <br /> Toluene ¢.0026 <.0026 Heavy metals <br /> Other PCB .110 N/A Other <br /> Comments (Depth of Remediation, etc.) : <br /> ONE LARGE EXCAVATION 250' LONG X 50' WIDE X 6' DEEP SURROUNDING AN EXCAVATION 100' LONG <br /> X 10' WIDE X 20' DEEP BENEATH THE 25,000 GALLON DIESEL TANK. <br /> ONE SMALL EXCAVATION 40' LONG X 12' WIDE X 9' DEEP BENEATH THE 10,000 GALLON WASTE <br /> WATER TANK. ONE 350' WASTE WATER PIPELINE GROUTED IN PLACE. <br /> RESIDUAL CONTAMINATION IS BELOW LUFT MAXIMUM ALLOWABLE LEVEL FOR TPH-d BENEATH THE <br /> LLCONCRETE SLAB FOUNDATION FOR THE SAND TOWER, AND FOR OIL & GREASE BENEATH THE WASTE WATERA <br /> PIPELINE. <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 /> j. <br /> Should corrective action be reviewed if land use changes? Yes (No) <br /> Monitoring wells Decommissioned: Yes No Number Decommissioned: Number Retained: <br /> List enforcement actions taken: NOTICE OF REIMBURSEMENT <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA ERAN Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: P1 AA-4- ova- Data: <br /> VI. RWQCB Notification a <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: Title: Date: <br /> VII. Additional Comments, Data, etc. <br /> SOIL ONLY i <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 />