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( Case Closure Summary Page z ,j g <br /> Leaking U-4erground Fuel Storage Tank Pro ram <br /> II1. Release and Site Character' tion Information (continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> � 3 F <br /> Contaminant Soil (ppm) Water (PPB) Contaminant Soil (ppm) Water (PPB) <br /> Before After Before After Before ;'After Before After <br /> TPH (Gas) 5,300. 2.5 4,100. <50.0 Xylene 313.0 0.19 180.0 <0.5 <br /> TPH (Diesel) ---- ---- ---- ---- Ethylbenzene 87.0 0.028 -<1--- <br /> -<0- <br /> Benzene 1.24 <.012 1,900. <0.5 Oil & Grease ---- ---- - -0,005 <br /> Toluene 44.6 <0.60 11.0 <0.5 Lead 24.0 ""' 1.2 <br /> 1,2 DCA ---- 0.046 1.6 1.6 PCE -- Y"-- <br /> Comments (Depth of Remediation, etc.) : i <br /> BULK OF IMPACTED SOIL REMOVED BY OVER-EXCAVATION. GROUNDWATER CONCENTRATIONS REDUCED <br /> TO NONDETECABLE LEVELS EXCEPT FOR 1, 2 DCA. TOTAL CHEMICAL MASS REMAINING = 0.1648 <br /> GALLONS {TANK PIT AREA) AND 0.1615 GALLONS (LEACH PIT ARE}A) k <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 I� F <br /> ,q �k <br /> Does corrective action protect public health for current land use? Yes <br /> Site management requirements: NONE <br /> i� <br /> Should corrective action be reviewed if land use changes? IjNo <br /> I Monitoring wells Decommisioned: NO Number DecommiIsionedr Retained. 6 <br /> :-- Numbe <br />{ List enforcement actions taken: INITIAL DIRECTIVE LETTERi' <br /> List enforcement actions rescinded: NONE I�II <br /> V. Local Agency Representative Data <br /> f <br /> Name: DONNA HERRN Title: DIRECTOR, ENVIRONMENTAL HEALTH DIVISION <br /> Signature: Dater <br /> VI. RWQCB Notification it <br /> Date Submitted to RB: RB Response: <br /> RWQCB Staff Name: Title: Date. k <br /> h <br /> VII. Additional Comments, Data, etc. � <br /> k <br /> !t <br /> i <br /> I} �M <br /> j This document and the related CASE CLOSURE LETTER, Shall Ibe re: ained by the lead agency <br />'f as part of the official site file. (08/24/93) { <br /> Exhibit N Page 2 of 2 i <br /> j <br />