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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill Release and Site Characterization Information(continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil Before Soil Water Water Contaminant Soil Soil Water Water <br /> (ppm) After Before After Before After Before After <br /> TPH(Diesel) <0.050 Xylenes 0.171 <0.010 N/A <0.0005 <br /> TPH(gas) 6.7 <1.0 N/A <0.050 MTBE 18.8 <0.005 N/A <0.0005 <br /> Benzene <0.005 <0.005 N/A <0.0005 TBA <0.020 <0.05 N/A <0.0005 <br /> Toluene <0.005 <0.005 N/A <0.0005 Oxygenates <0.010 <0.005 WA <0.0005 <br /> Ethylbenzene 0.018 <0.005 I WA <0.0005 <br /> Soil After results are from over-excavation of the former 12,000 UST. All soil samples from the sidewalls (15 to 16 feet bsg) <br /> and bottom (18 feet bsg)of excavation were non-detect ip all analytes. No groundwater samples were collected during the <br /> UST removal or excavation. The Water After results were from groundwater samples taken from MW-2. Both MW-1 and <br /> MW-2 were installed in the area back in 1986 to investigate a separate UST release under Local Oversight Program Site <br /> Code 1330. Concurrence for oosure from—RWQCB has b n M-rdes-for-Site_Code_1330 in2003._EHD has witnessed <br /> destruction of the two monitoring wells MW-1 and MW-2 on June 29,2005. <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: None Number Decommissioned:0 Number retained:0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local A=2j Rt2resentative Data <br /> Name: Margaret Lagorio Title: Supervising REHS/Site Mitigation/LOP Unit IV <br /> Signature: Date: -2 S QS <br /> VI. Central Valley R29ional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff:Jim Barton Response: <br /> Title: Assoc Eng Geologist <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. (08/24/93) Exhibit N Page 2 of 2 <br />