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S <br /> Case Closure Summary Page 2 l - <br /> Leaking Underground Fuel Storage TankProgram <br /> Ill. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations—Before and After Cleanup <br /> 7<0025 <br /> Water Water <br /> Contaminant Soil Soil Water Water <br /> Contaminant Soil Before After <br /> Before , <br /> Before After Before After (ppm) {ppm) (ppm} <br /> (Ppm) (pPm) (ppm) (ppm)- MT E ----TPH-G(UST2) <0.05 ---- ---- -- Lea (UST2} <0.5 ---- <br /> 430 7.9BPH-D ---- ED (UST2) <0.1 ---- ---- <br /> Benzene <.001 <0.005 ---- <br /> Toluene <.001 <0.005 ---- --.. <br /> Ethyllbenzene .04 <0.005 <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 minimal impact to soil. Groundwater samples were not <br /> collected. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses er the Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses er the Regional Board Basin Plan? Yes <br /> Does corrective action protect public health for current land use? es <br /> Site management requirements: none <br /> Should corrective action be reviewed if land use changes?Yes <br /> Monitoring wells decommissioned: NA Number Decom issioned: 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 [List enforcement actions rescinded: None 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: Don a Heran Titl : Director of:EEnvi:roEnmentalEHealEthE <br /> Signature: U Dale: p _ <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: August 28, 2000 Response Date: September 25, 2000 <br /> RB Staff: Marty Hartzell Response: Concurrence <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-UST(UST-1)samples alone. The gasoline-UST (UST-2) <br /> was not required to be further investigated. <br /> Im This document and the related CASE CLOSURE LETTER, Shalt be retained by the lead agency as part of the <br /> official site file. (08124/93) Exhibit N Page 2 of 2 <br />