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NkCase Closure Summary Page 2 <br /> aing Underground Fuel Storage Tank Program <br /> � <br /> lli Release and Site Characterization Information (continued) <br /> i <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After + <br /> TPH (Gas) 840 NA 190 ND Fthyibenzene 45 NA 21 ND <br /> TPH (Diesel) NA NA NA NA Xylene 83 NA 22 ND <br /> Benzene 16 NA 31 ND Oil. & Grease NA NA NA NA <br /> Toluene 17 NA 49 ND Heavy Metals NA NA NA NA <br /> Mineral Spirits NA NA NA NA Lead 11 NA 6.6 NA <br /> MTBE .029 <br /> Comments (Depth of Remediation, etc.): <br /> Groundwater monitoring was conducted from 4125189 to 12121/95.,Initial borings had free product. Reported concentrations <br /> of benzene went from 1240 ppb to ND without any form of active 'remediation. <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 Hoard <br /> 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: (Yes) Number Decommissioned:6 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 List enforcement actions rescinded: None I 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: !Donn Bran Title: Director of Environmental Health <br /> Signature: ,, �� Date: fff <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Brathovde Response: <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> 1 <br /> E <br /> . I <br /> This document and the related a e retains y the lead agency as part of the official <br /> site file. (08124193) Exhibit N Page 2 of 2 <br /> - t <br />