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'LCase Closure Summary Page 2 <br /> Leakiinderground Fuel Storage Tank ^?ram <br /> III. Release and Site Characterisation 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) 17000 NS FP .130 Xylene 3000 NS FP ND <br /> TPH (Diesel) Ethylbenzene 490 NS FP ND <br /> Benzene 220 NS FP ND Oil & Grease <br /> Toluene 1100 NS FP ND Heavy metals <br /> Other I iOther <br /> Comments (Depth of Remediation, etc.) : Free product at site July-Nov 1987 and May-July <br /> 1988. Vapor extraction conducted from July 1991 through March 2996. Groundwater sample <br /> result non detect for contaminants since March 1995 except for isolated low level hits. <br /> Confirmation soil borings were not required since further remediation would not be <br /> cost effective. Vapor extraction is at asymptotic levels. <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 Pian? (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 Decommi.sioned: Yes (No) Number Decommisioned: Number Retained: <br /> List enforcement actions taken: NOR 7/26/89 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising RSHS <br /> Signature: Date: //.3/17 <br /> VI. RWQCB Notification v <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 CASH 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 />