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^� --se Closure Summary Page 2 s <br /> Leaking,.�� erground Fuel Storage Tank Proem <br /> Release and Site Charact�'ization Information (continued) <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 /> TPH (Gas) 3,800. 6.0 80,000. 160. Xylene 430.0 0.16 2,000. 3.9 <br /> TPH (Diesel) ---- _--- ---- ---- Ethylbenzene 77.0 0.10 280.0 <0.5 <br /> Benzene 10.0 <.005 6,500. 1.5 Oil & Grease ---- ---- ---- ---- <br /> Toluene 160.0 <.005 2,800. 0.8 Heavy metals 6.10 <5.0 ---- ---- <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : <br /> BULK OF IMPACTED SOIL REMOVED BY OVER-EXCAVATION. MOST OF FORMER GROUNDWATER PLUME <br /> ALSO EXCAVATED AS THE EXCAVATION OCCURRED AT TIME OF LOW GROUNDWATER LEVEL. RESIDUAL <br /> LEVELS REMIANING = 11.5 POUNDS TOTAL PETROLEUM HYDROCARBONS AS GASOLINE (1.9 GALLONS) . <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 /> Should corrective action be reviewed if land use changes? NO <br /> Monitoring wells Decommisioned: YES Number Decommisioned:ll Number Retained: 0 <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name. DONNA HERAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Date: 06-12-95 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 04-22-95 RB Response: NONE <br /> RWQCB Staff Name: THAYER Title: STAFF ENG 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 />