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-._Case Closure Summary Page 2 <br /> Leakix'�" '7nderground Fuel Storage Tank F` 'Tram <br /> III. Release and Site Charac�ization Information (continuecl� <br /> J <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) 3,100. N/A* 1600. <50. Xylene 290.0 N/A* 31.0 <0.5 <br /> TPH (Diesel) 20000. 20000** 330. <50. Ethylbenzene 43.0 N/A* 6.8 <0.5 <br /> Benzene 2.6 N/A* <0.5 <0.5 Oil & Grease ---- ---- ---- ---- <br /> Toluene 160.0 <.005 2,800. 0.8 Heavy metals 13.0 <5,0 ---- ---- <br /> Other lOther <br /> Comments (Depth of Remediation, etc.) : <br /> BULK OF DIESEL IMPACTED SOIL REMOVED BY OVER-EXCAVATION. SOIL VAPOR EXTRACTION APPLIED i <br /> TO LIMITED SOIL PLUME. *NO CONFIRMATION BORINGS REQUIRED AS INITIAL LEVELS LOW AND AN <br /> ESTIMATED 190 LBS REMOVED. GROUNDWATER IS FREE OF HYDROCARBONS.**SOLUBLE LEVEL-I.3MG/L <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 /> i <br /> Site management requirements: NONE <br /> r <br /> Should corrective action be reviewed if land use changes? NO <br /> Monitoring wells Decommisioned: NO Number Decommisioned:01 Number Retained: 04 <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER i <br /> List enforcement actions rescinded: NONE <br /> r <br /> V. Local Agency Representative Data <br /> Name: DONNA HERRN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: J. BRATHOVDE Title: ASSOC ENG Date: <br /> VII. Additional Comments, Data, etc. <br /> a <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 />