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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 Soil Water Water Contaminant Soil SoilWaterWater Water <br /> Before After Before After Before (Ppm) Before After <br /> (ppm) (Ppm) (Ppm) (Ppm) (Ppm) (Ppm) (Ppm) <br /> TPH-G(UST2) <0.05 ---- ---- ---- MTBE ---- <0.025 ---- ---- <br /> TPH-D 430 7.9 ---- ---- Lead (UST2) <0.5 ---- ---- ---- <br /> Benzene <.001 <0.005 ---- ---- EBB(UST2) <0.1 ---- ---- ---- <br /> Toluene <.001 <0.005 ---- ---- <br /> Ethylbenzene .04 X0.005 ---- ---- <br /> Xylenes .03 <0.005 ---- ---- <br /> Comments (Depth of Remediation, etc.): Soil Before Results are from samples collected at the time of the UST removal. <br /> Soil After Results are from soil borings 2116199 which indicate min mal impact to soil. Groundwater samples were not <br /> collected. <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: NA Number Decommissioned: 0 Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signature: <br /> VI. Central Valley Regional Water Quality Control Board ( B) Notification <br /> Date Submitted to RB: August 21, 2000 Response Date: <br /> RB Staff: Marty Hartzell Response: <br /> Title:Assoc. Eng. Geologist <br /> VII. Additional Comments, Data, etc. <br /> A diesel-UST (UST-1) and a gasoline-UST (UST-2)were removed in 1990. The site was placed into Local Oversight <br /> Program on the strength of the contamination detected in diesel-LIST (UST-1)samples alone. The gasoline-UST (UST-2) <br /> was not required to be further investigated. <br /> This document and the related CASE CLOSURE LETTER, hall be retained by the lead agency as part of the <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br />