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Case Closure Summary Page 2 <br /> Leakir Underground Fuel Storage Tank * gram <br /> III. Release and Site Charac.,rization Information (continuec, <br /> .Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water (PPB) Contaminant Soil (ppm) Water (PPB) <br /> Before After Before After Before After Before After <br /> ITPH (Gas) 47000. 11.0 80,000. <50 Xylene 27100 2.3 2,300. <0.5 <br /> ITPH (Diesel) ---- ---- ---- ---- Ethylbenzene 4700. 0.036 3,600. <0.5 <br /> Benzene <. 005 <.005 0.8 <0.5 Oil C. <br /> Grease ---- ---- ---- ---- <br /> Toluene 42.0 <.005 0.8 <0.5 Heavy metals ---- ---- ---- ---- <br /> Other iOther <br /> i <br /> j Comments (Depth of Remediation, etc.) : <br /> BULB OF IMPACTED SOIL REMOVED BY OVER-EXCAVATION. GROUNDWATER PLUME HAS BEEN DECLINING <br /> SINCE COMPLETION OF REMEDIAL WORK AND HAS BEEN AT NONDETECTABLE LEVELS FOR LAST TWO <br /> QUARTERS. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? YES <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? YES <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements: NONE <br /> I <br /> Should corrective action be reviewed if land use changes? NO <br /> Monitoring wells Decommisioned: NO Number Decommisioned:NA Number Retained: 6 <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DO RERAN Title: DIRECTOR, ENVIRONM8;7TAI HEALTH DIVISION <br /> Signature: Date: 346 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: BOGGS Title: UST MANAGER 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 />