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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization 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) N/A N/A ---- ---- Xylene <.005 N/A ---- ---- <br /> TPH (Diesel) <5.0 N/A ---- ---- Ethylbenzene <.005 N/A ---- ---- <br /> Benzene .009 .009 ---- ---- Oil & Grease ---- ---- ---- ---- <br /> Toluene .021 .021 ---- ---- Heavy metals ---- ---- ---- ---- <br /> Other <br /> Comments (Depth of Remediation, etc.): <br /> ASSUMING A VERY CONSERVATIVE AREA OF IMPACT=64,000 CUBIC FEET; A SILTY CLAY BULK DENSITY <br /> = 120 POUNDS PER CUBIC FOOT; THE ESTIMATED VOLUME OF BENZENE REMAINING=0.069 POUNDS; <br /> OF TOLUENE=0.161 POUNDS. <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: N/A Number Decommisioned: 0 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 List enforcement actions rescinded: NONE 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: DONN1KHERAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: d� Date: /o—/7—?Lf <br /> Vi. RWQCB Notification <br /> Date Submitted to RB: 08-30-94 RB Response: NONE <br /> RWQCB Staff Name: THAYER Title: 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 /> f w .- <br />