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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 i, Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 16,000. 0.501 .940 <0.05 Ethyl-benzene 360. <0.002 0.021 <0.0005 <br /> TPH (Diesel) NA NA <0.050 <0,05 Xylene 2,000. <0.004 0.130 <0.0005 <br /> Benzene 63. <0.002 .017 <0.0005 <br /> Toluene 1,300. <0.004 .0046 <0.0005 <br /> MtBE NA <0.01 0.190 10.021 <br /> Comments: NO GROUNDWATER RESULTS IN PARTS PER MILLION! "BEFORE" SOIL DATA FROM "SB-1- Y <br /> 40.5" IN FEB'91.I,"AFTER" SOIL DATA FROM "SB-6-36" IN AUG199 (CONFIRMATION BORINGS)AT , <br /> APPROXIMATELY SAME AREA. "BEFORE" GROUNDWATER DATA FROM MW-3 (except MtBE) 1N EARLY 1990's. <br /> "AFTER" GROUNDWATER DATA FROM MW-3(except MtBE) ON JULY 30,2000. MtBE GROUNDWATER DATA <br /> FROM "VEW-2" IN CORE OF PETROLEUM SOIL PLUME. <br /> IV. Closure <br /> Does completedlcorrective 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? OPTIONAL <br /> Number of wells:associated with site: 7MW,2VEW. Have the Monitoring[Vapor wells been decommissioned?YES <br /> List enforcement actions taken: . NOR.,0710211991 <br /> List enforcement actions rescinded: NA <br /> V. Local Agency!Representative Data <br /> Name: Donna Heran 1 Margaret Lagorio Title: Director of Envn Health 1 LOP Supervisor <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: January 11,2001 Response Date: February 6, 2001' <br /> RB Staff: Marty Hartzell Response: Concurrence with NFA. <br /> Title: Engineering Geologist it <br /> VII. Additional Comments, Data, etc. <br /> PHS-EHD approved RAP for SVE on March 14, 1994. On November 1995 SVE system (thermal ox)was installed and <br /> operated from wells,VEW 1 &2, MW's 2,3, &5 until March 1996. New SVE system (carbon filtration) operated <br /> February 1997 to March 1998 primarily from VEW 1 &2. Confirmation soil borings (SB-3 thru SB-7) advanced <br /> August 26,2000: All wells properly destroyed under EHD witness,June 4,2001. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official <br /> site file. <br /> M11 1/01 <br /> ii k <br />