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Case Closure Summary Page !2 <br /> Leak 4III. Release and Site CharacterizationuInformationd Fuel r(coage Tank F�+ ram <br /> {continued) <br /> Maximum Documented Contaminant Concentrations--Before andjAfter Cleanup <br /> Contaminant Soil (ppsa) Water (ppm) Contaminant Soil <br /> Before After Before After (ppm} Water (ppm) <br /> Before After Before After <br /> TPH (Gas) 0.350 0.350 .620 <.05 Xylene <br /> TPH {Diesel} _ _ <.06;,F <.06 0.094 <.0005 <br /> Benzen - _ Ethylbenzene I <.06 " <.06 0.021 <.0005 <br /> e 0.083 0.083 0.140 <.0005 Oil & Grease <br /> Toluene <.008 <.008 0.140 <.0005 Heavy metals - <br /> Other - - - - Other <br /> Comments (Depth of Remediation, etc.) : ?, <br /> HIGHEST DTW FROM MW1, 4/6/89. LOWEST DTW FROM MW1 10/13/931. SOIL BEFORE FROM BH2 0 201 . <br /> SOIL INVESTIGATION INDICATED THAT THF, SOIL CONTAMINATION EVIDENCED IS LIMITED. <br /> F ROUNDWATER BEFORE FROM MW1 ON 10/13/93. GROUNDWATER AFTER FROM MW1 ON 10/31/95. <br /> f I� <br /> IV. Closure !� <br /> I , <br /> Does completed corrective action protect existing beneficia <br /> Basin Plan? (Yes) No l uses per the Regional Board <br /> Does completed corrective action protect potential beneficial uses per the Regional Board <br /> Basin Plan? (Yes) No <br /> �i <br /> Does corrective action protect public health for current land use? (Yes) No <br /> i <br /> Site management requirements: NONE <br /> I� <br /> Should corrective action be reviewed if land use changes? 111Yes (No) <br /> Monitoring wells Decommissioned: (Yes) No Number Decommissioned: 5 Number Retained: 0 <br /> List enforcement actions taken: <br /> NOTICE OF REIMBURSEMENTS SENT 5/19/95 TO CHEVRON AND 10/15%92 TO ULYCESS WILLIAMS. <br /> h <br /> �t <br /> List enforcement actions rescinded: NONE <br /> I� <br /> V. Local Agency Representative Data I <br /> Name: DONNA HERRN Title:DIRECTOR OF $NVIRaNMENTAL HEALTH <br /> Signature: Date: S <br /> VI. RWQCB Notification <br /> Date Submitted to RB: 1/23/96 RB Response:CONCURRENCE FOR1NO FURTHER ACTION <br /> RWQCB Staff Name: G BOGGS Title:PROGRAM COORD. Date:04/05/96 <br /> VII. Additional Comments, Data, etc. <br /> E.R. SIMONIS, REGISTERED GEOLOGIST #4422 ESTIMATED APPROXIiMATELY 1300 YD OF CONTAMINATED <br /> SOIL REMAINS BETWEEN 15-50' BELOW GRADE AT AN AVERAGE CONCENTRATION OF 0.29 PPM TPH-GAS- <br /> -THIS MASS OF HYDROCARBONS EQUALS TO APPROXIMATELY 0.2 GALLONS OF GASOLINE. DUE TO THE <br /> LIMITED MASS OF HYDROCARBONS IT WAS ANTICIPATED THAT SORPTION AND BIODEGRADATION WOULD <br /> PREVENT PRESENT AND FUTURE IMPACT TO GROUNDWATER. j�7 <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) j} <br /> Exhibit N Page 2 of 2 I' <br />