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-Case Closure Summary Page 2 <br /> Leakir Jnderground Fuel Storage Tank F ram <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) <1.0 ---- 0.65 <50 Xylene 0.522 ---- 58.3 <0.5 <br /> TPH (Diesel) ---- ---- ---- ---- Ethylbenzene 0.115 ---- 3.5 <0.5 <br /> Benzene 0.89 ---- 385.0 <0.5 Oil & Grease ---- ---- ---- ---- <br /> Toluene 1.03 ---- 115.0 <0.5 Heavy metals 10.4 ---- <0.01 ---- <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : <br /> LIMITED SOIL IMPACTED BY A SUSPECTED LINE LEAK IN 1986. CURRENT GROUNDWATER DATA <br /> INDICATE LIMITED SOIL IMPACT NOT A SIGNIFICANT THREAT TO GROUNDWATER. REPORT <br /> STATES NATURAL DEGRADATION PROCESSES WILL REDUCE SOIL IMPACT FURTHER OVER TIME. <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:04 Number Retained:00 <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA H Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Date: f-1 6 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 03-28-96 RB Response: CONCURRENCE <br /> RWQCB Staff Name: BRATHOVDE Title:ASSOC ENG GEOL Date: 04-05-96 <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 -or 2 <br />