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aking Underground Fuel Storage Tank Prr' n <br /> III Release and Site Characterization Information (continued) . <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup - <br /> 7Benene <br /> inant Soil (ppm) Water{ :1(ppm) Contaminant SoilBefore After Before After (ppm) Water (ppm) <br /> s Before. After Before After <br /> ) NA NA NA NA Xylene �t 0.005 <0.01 NA NA <br /> esel) 2400 <1.0 NA NA ':., Ethylbenzene <0.005 <0:005 NA<DA05 <0.005 NA . NA ;. NA <br /> -r Oil&Grease NA NA NA NA <br /> 0.005 <0.005 NA NA Heavy Metals NA <br /> MTBE !� NA NA NA <br /> �.,. NA NA, NA NA <br /> Comments: The Soil Before concentrations are from a piping trench sample (S4=trench 1)collected at f approximately 4 feet <br /> bgs. The area of identified diesel contamination was over-excavated to approximately 14 feet bgs and resampled. The Soil <br /> After concentrations are from samples collected post aver-excavation. <br /> The'Con' a led soil stockpile site (estimated TPN-d mass of 144 pounds)and soil confirmation sample s weretarnin collected and analyzed. The canfieated an- <br /> sample results were below laboratory detection limits for�TPH-d. The treat <br /> site <br /> ed soil will remain on-site per RP . <br /> IV. Closure ! <br /> Does completed corrective action protect existingbeneficial uses per the Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan?,Yes <br /> Does corrective action protect public health.for current land use?Yes ,l <br /> Site management requirements: NA h� s <br /> Should corrective action be reviewed if-land use changes?NA <br /> MonitoringNapor wells decommissioned:0 Number Decommissioned: 0 �4 N retained:i <br /> 0 <br /> List enforcement actions taken: NOR `� umber <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data i <br /> Name: Adrienne Ellsaesser, RENS j <br /> Title: Acting Program Coordinator <br /> # y <br /> Signature: <br /> ry Date: <br /> VL Central Valle <br /> Regional Water Q,11 :1 Control Board RB Notification it . <br /> Date Submitted to RB: <br /> Response <br /> RB Staff: J. Barton <br /> Title: En . Geof list Response: <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASEk � # <br /> site file. CLOSURE LETTER, Shall be retained iby the dead agency as part of the official <br /> 1 <br />