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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 Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> <0.001 <0.0005 <br /> <1.0 <0.5 <0.05 <0.05 Xylenes 1.8 <0.001 <br /> TPH (Gas) <0.0005 <0.0005 <br /> TPH (Diesel) 8,000 <1.0 0.10 0.520 Ethylbenzene 0.74 <0.001 NA <0.3 <br /> Benzene <0.1 <0.001 <0.0005 <0.0005 Oil&Grease NA NA <br /> < <0.0005 <0.0005 HeavyMetals 23.0 NA NA NA <br /> Toluene 0.33 0.001 MTBE <0.01 <0.0005 <0.005 <0.0005 <br /> Comments: SOIL 'BEFORE' DATA FROM TANK 2 EAST SAMPLE @ 9 FEET BSG EXCEPT: TPH-g, MtBE AND LEAD <br /> FROM TANK 1 SOUTH SAMPLE @ 13 FEET BSG. SOIL 'AFTER' DATA FROM SAMPLE LSW-45 COLLECTED FROM <br /> BOTTOM OF EXCAVATION PIT IN AREA CLOSEST TO TANK 2. WATER 'BEFORE' DATA FROM 9/01/00 SAMPLING <br /> OF MW-1; WATER 'AFTER' DATA FROM 11/18/09 SAMPLING OF MW-5. <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/Vapor wells decommissioned: YES Number Decommissioned: 7 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA HERAN, REHS Title: DIRECTOR, ENVIRONMENTAL HEALTH DEPT. <br /> Signature: Date: J <br /> U4'A -ti_'.ti 4('. 4k_4_'1 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 11/10/2010 Response Date: 12/06/2010 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> Soil contamination resulting from the UST's was removed from the site, therefore, no threat of vapor intrusion from the UST <br /> soil contamination exists. The groundwater contamination is over 50 feet below ground surface, is mostly diesel and <br /> heavier petroleum constituents, and is not likely to pose a vapor intrusion threat. <br /> This document and the related CASE CLOSURE LETTER Shall be retained by the lead agency as part of the official site file. <br />