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Release and Site Characteriza information (continued) <br /> Maximum Documented Contaminant Concentrations-- Before and After Cleanup <br /> FA( e <br /> Contaminant Soil Before (ppm) . . Water7A( <br /> m} <br /> Contaminant Soil Before (ppm) Water (Ppm) <br /> After Before After 7Beforeer. . . <br /> 0.53018 <br /> TPH (Gas) 3,800 2,300 6.16 Xylenes 270 450 0.21015 <br /> TPH(Diesel) 20 NA NA Ethylbenzene NA69 11 0.73 Oil&Grease NA NA NA- <br /> Benzene <0.0005 Heavy Metals 6 NA NA NA <br /> Toluene 210 84 O.a1 "�' <0.01 <0.005 <br /> MTB!* NA <0.5 <br /> Comments: SOIL 'BEFORE' results from soil samples collected beneath the UST at the time of removal. SOIL'AFTER' <br /> 4 results are the highest concentration found in the soil samples collected after the excavation of contaminated soil in <br /> February 2005. The excavation sample was SWNE at 12 feet below surface. The excavation bottom soil sample collected <br /> at 13.5 feet below surface had 150 ppm TPH and<.05 ppm Benzene. WATER'BEFORE' results are-from MW1 on <br />'I 1128197. WATER-'AFTER' results are from MW-1 R, 4th QUARTER 2006.. <br /> IV. Closure <br /> I; 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 /> i <br /> k Site management requirements: NONE <br /> Should corrective action be reviewed if land use changos?YES <br /> Monitoring/Vapor wells decommissioned: NO Number Decommissioned: 1 Number retained: 6 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO, REHS Title: PROGRAM COORDINATOR, UNIT IV <br /> Signature: Date:" 07. <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> i F . <br /> t Date Submitted to RB: Response Date: <br /> RB Staff: JAMES L.L. BARTON Response: <br /> Title: ENGINEERING GEOLOGIST <br /> s VII. Additional Comments, Data, etc. <br /> a <br /> SOIL GAS SURVEY COMPLETED ON 115107. ONE OF SIX SAMPLES, SG-1, HAD RESULTS FOR BENZENE AND TPH <br /> EXCEEDING ESL's. ANOTHER PROBE A FEW FEET AWAY WAS ND. A PREVIOUS SOIL BORING NEAR THE SAME <br /> LOCATION WAS ND.IN SOIL SAMPLES COLLECTED AT 7.5 AND 11.5 FEET BSG. SOIL GAS PROBES CLOSEST TO <br /> THE HOUSE WERE ND FOR BENZENE AND TPH, BELOW ESL'S FOR OTHER ANALYTES. GROUNDWATER <br /> CONCENTRATIONS HAVE BEEN GREATLY REDUCED SINCE THE EXCAVATION WAS COMPLETED. <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 />