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� <br /> � <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ui Release and Site Characterization Information (oonUnued) <br /> Maximum Documented Contaminant Concentrations- - Before and After Cleanup <br /> Contaminant Sol] Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH (Gas) 14,000 920 46.0 <005 Xylenes 1600 <0.005 18.0 <0.0005 <br /> TPH (Diesel) 52,000 7,800 25.0 <005 Ethylbenzene 270 <0.005 2.9 <0.0005 <br /> Toluene 340 <0.005 25 <0.0005 Heavy Metals NA NA NA NA <br /> Comments: Soil 'Before'results for TPH-d are from MW9-11 0 on 12/5/05 and for TPH-g, BTEX, MTBE are from 135-25 on <br /> 9/18/97. Soil 'After' results are the highest reported concentrations from confirmation soil sample P-11, from depths of 20-26 <br /> feet on 4/15/09. Water'Before'results are the highest pre-remediation concentrations reported in MW-2, the most highly <br /> impacted well at the site; Water'After'results are the most current concentrations reported. Groundwater samples have <br /> been reported as non-detect since March 2006. <br /> |V. 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 uses changes?YES <br /> Monitoring/Vapor wells decommissioned: YES Number Decommissioned: 12 Number retained: 0 <br /> List enforcement actions takem 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 List enforcement actions rescinded: NONE 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� <br /> V|. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 05/28/09 Response Date: 06/12/09 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VU. Additional Cornnnanta. Data. aho. <br />