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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 /> 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) 760 400 140 <.05 Xylenes 340 39 18 <.001 <br /> TPH (Diesel) 4800 1800 1.300 0.068 Ethylbenzene 96 10 3.6 <-0005 <br /> Benzene 27 5.4 11 <.0005 Oil&Grease NA NA NA NA <br /> Toluene .210 16 18 <.0005 Heavy Metals 11 8 NA NA <br /> MTBE NA <5 0.4 <.0005 <br /> Comments: "SOIL BEFORE" results from tank pull samples on 10128188. "SOIL AFTER" results from soil borings in and <br /> around the tank pit area (depth of 10 feet bsg, highest conc. sample results)on 12119197. 'WATER BEFORE"results from <br /> soil boring grab samples. "WATER AFTER" results from groundwater monitoring wells samples from June 30, 2008. No <br /> remediation has been performed at this site. Soil Vapor samples were collected on 4130108; results were all non-detect. <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 i <br /> Should corrective action be reviewed if land uses changes?YES <br /> Monitoring/Vapor wells decommissioned: 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 List enforcement actions rescinded: NONE 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 RERAN, REHS Title: DIRECTOR, ENVIRONMENTAL HEALTH DEPT. <br /> Signature: -- Date: ^' Og <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 09/11/08 Response Date: 09/26/08 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> Human Health Risk Assessment Report dated 08/29/08 documents results of the soil vapor survey and Johnson & Ettinger <br /> risk assessment model which determine that the residual contamination at this site poses no unacceptable risk to human <br /> health or the environment. Compliance with public participation requirements in sections 2728 of the California Code of <br />' <br /> Regulations has been met. <br /> i 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 />