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Ill. 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 /> TPH(Gas) 3,800 2,300 6.16 0.100 Xylenes 270 220 0.53 0.0018 <br /> TPH (Diesel) 20 NA NA NA Ethylbenzene NA 45 0.21 0.0015 <br /> Benzene 69 11 0.73 <0.0005 Oil & Grease NA NA NA NA <br /> ' Toluene 210 84 0.41 <0.0005 Heavy Metals 6 NA <br /> NA NA <br /> MTBE NA <0.5 <0.01 <0.005 <br /> Comments: SOIL `BEFORE' results from soil samples collected beneath the UST at the time of removal. SOIL`AFTER' <br /> 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 /> 1128197. WATER`AFTER' results are from MW-1 R, 4th QUARTER 2006: <br /> 5 <br /> j <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 Pian? 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 List enforcement actions rescinded: NONE 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 /> rNs <br /> Signature: Date: to <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 02127/07 . Response Date: 06/29/07 <br /> a <br /> RB Staff: JAMES L.L. BARTON Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> SOIL_ GAS SURVEY COMPLETED ON 115107. ONE OF SIX SAMPLES, SG-1, HAD RESULTS FOR BENZENE AND TPH <br /> EXCEEDING ESUS. ANOTHER PROBE A FEW FEET AWAY WAS ND, VAPOR SAMPLES FROM FOLLOW UP <br /> PROBES ON 5/24107 WERE NON-DETECT. A PREVIOUS SOIL BORING NEAR THE SAME LOCATION WAS ND IN <br /> SOIL SAMPLES COLLECTED AT 7.5 AND 11.5 FEET BSG. SOIL GAS PROBES CLOSEST TO THE HOUSE WERE ND <br /> FOR BENZENE AND TPH, BELOW ESUS FOR OTHER ANALYTES. GROUNDWATER CONCENTRATIONS HAVE <br /> BEEN GREATLY REDUCED SINCE THE EXCAVATION WAS COMPLETED.- <br /> This <br /> OMPLETED.This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official <br /> site file. <br /> i <br />