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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) 6.6 23.0 ---- ---- Xylene 0.50 <0.025 ---- ---- <br /> TPH (Diesel) 27.0 19.0 ---- ---- Ethylbenzene 0.093 <0.025 ---- ---- <br /> Benzene 0.005 <0.025 ---- ---- Oil & Grease ---- ---- ---- ---- <br /> Toluene 0.0620 <0.025 ---- ---- Heavy metals ---- ---- ---- ---- <br /> Other Other <br /> Comments (Depth of Remediation, etc.) : <br /> BULK OF IMPACTED SOIL REMOVED BY OVER-EXCAVATION. DEPTH TO GROUNDWATER IS OVER 80 FEET <br /> BELOW GROUND SURFACE (BGS) . RESIDUAL CONTAMINATION IS AT A DEPTH OF APPROX. 10' TO 15' <br /> BGS WITH 5.2 AND 4.3 LBS (0.8 AND 0.6 GALS) HYDROCARBONS AS GASOLINE AND DIESEL REMAINING <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:N/A Number Retained:N/A <br /> List enforcement actions taken: INITIAL DIRECTIVE LETTER <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONN HERAN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Date: —� <br /> VI. RWQCB Notification <br /> EQC <br /> Submitted to RB: RB Response: N/A <br /> B Staff Name: BOGGS Title: Date: <br /> VII. Additional Comments, Data, etc. <br /> *****SOIL ONLY******* <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 />