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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) 1.4 <1.0 <20 <0.05 Xylenes <0.005 «0.05 <0.2 <0.0005 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene <0.005 <0.025 <0.2 <0.0005 <br /> Benzene <0.005 <0.025 <0.2 <0.0005 Oil &Grease NA NA NA NA <br /> Toluene <0.005 <0.025 <0.2 <0.0005 Heavy Metals NA NA NA NA <br /> MTBE 36 9.4 120 0.043 <br /> Comments: SOIL 'BEFORE' DATA FROM TANK PIT SAMPLE T1-10'; SOIL `AFTER' DATA FROM BORING MW-5 @ 10'. <br /> GROUNDWATER DATA FROM MW-5: `BEFORE' DATA FROM 10/30/03 SAMPLING EVENT, `AFTER' DATA FROM <br /> 7127109 SAMPLING 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 /> MonitoringfVapor wells decommissioned: YES Number Decommissioned. 12 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 List enforcement actions rescinded: NONE 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: q f� <br /> Vl. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 09/18/09 Response Date: 10/05/09 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRENCE r <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> COMPLIANCE WITH THE PUBLIC PARTICIPATION REQUIREMENTS IN SECTION 2728 OF THE CALIFORNIA CODE <br /> OF REGULATIONS HAS BEEN MET. SITE PASSES ESL SCREENING LEVELS FOR VAPOR INTRUSION THREAT. <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 />