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Case Closure Summary Page 2 <br /> No0aking Underground Fuel Storage Tank Pro ram <br /> j <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations—Before and After Cleanup** <br /> ----: Not analyzed <br /> N/D: Not detected above detection limit <br /> Contaminant Soil Soil After Water Water Contaminant Soil Soil After Water Water <br /> Before (ppm) Before After Before (ppm) Before After <br /> 3 (Ppm) (Ppb) (Ppb) (Ppm) (Ppb) (Ppb) <br /> TPH-G 677 491 N/D Ethylbenzene .020 28.8 N/D <br /> Benzene N/D N/D N/D Xylene 23.46 188.2 N/D <br /> Toluene .005 26.8 N/D DIPE N/D -- 0.69 <br /> MTBE N/D* ---- N/D ETBE N/D ---- N/D <br /> TAME N/D ---- N/D TBA 074 -- N/D <br /> Comments (Depth of Remediation, etc.): Tanks were removed in 1996. Investigation shows minimal impact to soil and no <br /> significant impact to groundwater. * Results of a soil sample collected at the tank removal and analyzed using EPA 8020 <br /> were 1000 ppb of MTBE. That number may have been a false positive, since subsequent investigation of both soil and <br /> groundwater revealed no presence of MTBE. "Soil Before"results are from SB2 and SB1 samples from 1998. <br /> Remediation was not performed so there are no Soil After results. Water Before results are from the grab water samples <br /> collected in 1/97. "Groundwater After"results were from MW 1 quarterly sampling on 8/25/99. <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: Yes Number Decommissioned: 1 Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: DorrkHeran Title: Director Environmental Health <br /> Signature: VYLA — ' Date: C —'.--2- C�C <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: January 11, 2000 Response Date: February 11, 2000 <br /> RB Staff: Marty Hartzell/Mike Smith Response: concurred with No Further Action Required <br /> Title:Assoc Eng Geologist <br /> VII. Additional Comments Data etc. <br /> Monitoring Well was destroyed according to Well Standards on July 18, 2000. <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the <br /> official site file. (08/24193) Exhibit N Page 2 of 2 <br />