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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 (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) N/A N/A N/A N/A Xylene N/A N/A N/A N/A <br /> TPH (Diesel) 7400 7400 .130 0.05 Ethylbenzene N/A N/A N/A N/A <br /> Benzene 0.42 0.42 N/A N/A Oil & Grease N/A N/A .130 0.05 <br /> Toluene N/A N/A N/A N/A Heavy metals N/A N/A N/A N/A <br /> Other N/A N/A N/A N/A Other N/A N/A N/A N/A <br /> Comments (Depth of Remediation, etc.) : <br /> HIGHEST SOIL CONCENTRATION FOUND IN B-5 AT 12 FEET BGS <br /> HIGHEST BENZENE IN SOIL FOUND IN B-13 AT 16 FEET BGS <br /> III_ <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> Does corrective action protect public health for current land use? (Yes) No <br /> Site management requirements: <br /> Should corrective action be reviewed if land use changes? (Yes) No <br /> Monitoring wells Decommisioned: (Yes) No Number Decommisioned: 3 Number Retained: <br /> List enforcement actions taken: LEVEL #1, NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: DONNA H Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: Date: 3: 1,7-— 6 <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 05/04/94 RB Response: <br /> RWQCB Staff Name:E THAYER Title:ASSOC ENGINEER Date: <br /> VII. Additional Comments, Data, etc. <br /> SITE CLOSURE BASED UPON A RISK ASSEMENT PERFORMED BY CHEMRISK WHICH CONCLUDED CONTAMINANTS <br /> ARE RELATIVELY IMMOBILE AND NOT A THREAT TO GROUNDWATER QUALITY. <br /> t <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 />