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W . y <br /> T <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppb) Contaminant Soil (ppm) Water (ppb) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 15 <3(ND) --- ---- Ethylbenzene 11 ND --- — <br /> TPH (Diesel) --- — -- --- Xylene 20 ND --- -- <br /> Benzene NO ND -- --- Oil&Grease — ---- --- -- <br /> Toluene ND -- --- Heavy Metals --- --- _–_ <br /> Mineral Spirits — ---- -- — Lead ---- -- --_ _�_ <br /> MTBE ---- <.005 <br /> Comments: Tanks were removed in 1990. Contamination had been found only beneath the 500 gallon UST. Investigation <br /> shows minimal or no impact to soil . Beneficial uses of groundwater are protected, now and in the future. Soil Before is <br /> from the soil samples collected at the time of the UST removal. Soil After is from the soil samples from the boring in 1998. <br /> No cleanup was required. <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 <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: NIA Number Decommissioned: NIA Number retained: NIA <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Nam nna HeranTitle: Director of nvironmental Health <br /> Sig tore: Date: 1j <br /> LY /CealValley Regional Water Quality Control Board (RB) Notification <br /> D Submitted to RB: 6/26/1998 Response Date: <br /> RB Staff. Mark List Response: No Response <br /> Title: Assoc Geologist <br /> VII. Additional Comments, Data, etc. <br /> SOIL ONLY <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the <br /> official site file. (08/24/93) Exhibit N Page 2 of 2 <br />