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tlwl ''ase Closure Summary Page 2 1/.d � <br /> Leak_ .,Jnderground Fuel Storage Tank -gram <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) 1000 <100 FP <.10 Xylene 330 <.015 FP <.0012 <br /> TPH (Diesel) N/A N/A N/A N/A Ethylbenzene 65 <.005 FP <.0006 <br /> Benzene .8 <.005 FP <.0006 Oil & Grease N/A N/A N/A N/A <br /> Toluene 170 <.005 FP <.0006 Heavy metals N/A N/A N/A N/A <br /> Other IXTBE UNKNOWN <.05 UNXNOWN .0047 <br /> Comments (Depth of Remediation, etc.) : <br /> GASOLINE SOURCE APPEARS TO BE IN AREA OF VW35 AT 50' BGS. VES REMOVED 106,065 LBS FROM <br /> 1989 - 1995. TWO CONFIRMATION BORINGS IN AREA OF CONTAMINATION INDICATES LOW RESIDUAL IN <br /> SOIL. MWs ARE BELOW DETECTION LIMITS FOR GASOLINE. MTBE WAS DETECTED AT 4.7 PPB IN <br /> MW #30. <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 Decommi.sioned: Number Retained:48 <br /> List enforcement actions taken: LEVEL ONE, NOR SENT TO RESPONSIBLE PARTY <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name:MARGARET LAGORIO RENS Title: SUPERVISOR LOP/SITS MITIGATION UNIT <br /> Signature: Date: <br /> VI. RWQCB Notification <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: 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 />