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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 /> TPH (Gas) 6,700 9,800 0.613 <0.05 Xylenes 710 950 0.025 <.0005 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 71 78 0.0055 <.0005 <br /> Benzene <5 <2.5 0.014 0.0015 Oil&Grease NA NA NA NA <br /> Toluene 47 52 <.0005 <.0005 Heavy Metals NA NA NA NA <br /> MTBE 1.71 0.41 0.17 0.0008 <br /> Comments: SOIL 'BEFORE' RESULTS FROM PIPING UPGRADE SAMPLES; SOIL 'AFTER' RESULTS FROM <br /> DISPENSER AREA OVEREXCAVATION SAMPLES. WATER 'BEFORE' RESULTS ARE THE HIGHTEST DETECTIONS <br /> REPORTED AT THE SITE; WATER'AFTER' RESULTS FROM 318107 QUARTERLY MONITORING EVENT, <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 installed: YES Number Decommissioned: 3 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 List enforcement actions rescinded: NONE 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 Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: 1-0 Date: <br /> 1 7''--y"ek_ — <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 7/5/07 Response Date: 8117107 <br /> RB Staff: JAMES L.L. BARTON Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> REVISED ESTIMATE OF CONTAMINANT MASS REMAINING IN THE SOIL IS 237 LBS TPHg AND 0.04 LBS MTBE. <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 />