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Case Closure Summary Page 2 <br /> Aa JeI'kking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations <br /> Contaminant Soil;from tank Soil MW-1 Stockpile soil Post- <br /> Overexcavation Water1994 Water 1995 Water Post- <br /> removal 1994 installation 1995 (ppb) (ppb) Overexcavation <br /> (ppm) 1996 <br /> TPH (Gas) ---- <7 <1 ppm ---- <50 ---- <br /> TPH(Diesel) 5500 ppm .<5 257 ppm ---- <50 ---- <br /> Benzene ND<5.0 ppb <0.003 <3.0 ppb ---- 2.0 ---- <br /> Toluene ND<5.0 ppb <0.003 <3.0 ppb ---- 2.0 ---- <br /> Ethylbenzene 6.8 ppb <0.003 28 ppb ---- <0.3 ---- <br /> Xylene 37 ppb <0.003 175 ppb ---- 2 <br /> --- 270 ---- ---- <br /> MotorOil <500 ppm ppm 7 <50 <br /> Tanks were removed in 1994 and 1450 cubic yards of contaminated soil wasrover-excavated to 24 feet below surface grade <br /> and subsequently transported to Ripon Police Department for use at the firing range. Investigation indicates minimal impact <br /> to soil and groundwater. Beneficial uses of groundwater are protected, now and in the future. t <br /> i <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes 1 <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? Yes <br /> Monitoring wells decommissioned: Yes Number Decommissioned:'1 Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None I <br /> V. Local Agency Representative Data <br /> Name: Do Heran Title: Directorof Environmental Health <br /> Signature: --;,�,, - Date: j I—, `I c)C) <br /> VI. Central Valley Regional Water Quality Control Board (RB)Notification <br /> I <br /> Date Submitted to RB: October 23, 2000 Response Date: November 15, 2000 <br /> RB Staff: Marty Hartzell Response: Cbncurrence that no further action is required <br /> Title:Assoc Eng Geologist <br /> I <br /> VII. Additional Comments, Data, etc. ° <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08124/93) Exhibit N Page 2 of 2 <br />