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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill. Release and Site Characterization Information (continued) <br /> IIMaximum 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 /> TPH(Gas) <1.0 <0.5 <0.05 <0.05 Xylenes 1.8 <0.001 <0.0005 <0.001 <br /> TPH(Diesel) 8,000 <1.0 0.10 0.520 Ethylbenzene 0.74 <0.001 <0.0005 <0.0005 <br /> Benzene <0.1 <0.001 <0.0005 <0.0005 Oil&Grease NA NA NA <0.3 <br /> Toluene 0.33 <0.001 <0.0005 <0.0005 Heavy Metals 23.0 NA NA NA <br /> 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: 4 Number retained: 3 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: ADRIENNE ELLSAESSER, REHS Title: ACTING PROGRAM COORDINATOR, UNIT IV <br /> Signature Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: tt ' L&I t p Response Date: <br /> RB Staff: JAMES L.L. BARTON, PG Response: <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 />