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Case Closure Summary Page a <br /> Leaki- `'Underground Fuel Storage Tank — .gram <br /> III. Release and Site Chararizatioxi Information (continue <br /> Maximum Documented Contaminant Concent'rations--Before and After Cleanup <br /> i <br /> Contaminant Soil (ppm) Water (PPB) Contaminant Soil (ppm) Water (PPB) <br /> Before After Before After Before After Before After . <br /> TPH (Gas) 47000. 11.0 80,000. <50 Xylene 27100 2.3 2,300. <0.5 <br /> TPH (Diesel) ---- ---- ---- - Ethylbenzene 4700. 0.036 3,600. <0.5 <br /> Benzene <.005 <.005 0.8 <01.5 Oil & Grease ---- ---- ---- ---- <br /> Toluene 42.0 <.005 0.8 <0.5 heavy metals ---- ---- ---- ---- <br /> Other , Other <br /> Comments (Depth of Remediation, etc.) : <br /> BULK 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 /> { <br /> Does completed corrective action protect existing beneficial uses per the Regional Board 1 <br /> Basin Plan? YES <br /> i <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? YES <br /> L <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? NO <br /> Monitoring wells Decommisioned: NO Slumber 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 List enforcement actions rescinded: 'NONE 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 HE Title: DIRECTOR, ENVIRO HEALTH DIVISION <br /> Signature: Date: 3 <br /> VI. RWQCB Notification ;. <br /> Date Submitted to RB: RBIResponse: <br /> RWQCB Staff Name: BOGGS Title: UST MANAGER Date: <br /> VII. Additional Comment:', Data, etc. <br /> i <br /> 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) . G <br /> Exhibit N Page 2 of 2 <br />