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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) 14,000 920 46.0 <0,05 Xylenes 1600 <0.005 18.0 40.0005 <br /> TPH(Diesel) 52,000 7,800 25.0 <0.05 Ethylbenzene 276 <0.005 2.9 <0.0005 <br /> Benzene <0.1 <0.005 0.04 <0.0005 Oil& Grease NA NA NA NA <br /> Toluene 340 <0.005 2.5 <0.0005 Heavy Metals NA NA NA NA <br /> MTBE <1.3 <0.005 <1.0 <0,001 <br /> Comments: Soil'Before' results for TPH-d are from MW9-1 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-1,from depths of 20-25 <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 /> 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 uses changes? YES <br /> MonitoringNapor wells decommissioned. 0 Number Decommissioned: 0 <br /> Number retained: 12 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> MARGARET LAGORIO, RENS Title: PROGRAM COORDINATOR, UNIT IV <br /> Signature: Date: <br /> '51--x A <br /> VI, Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: JAMES L.L. BARTON, PG Response: <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> FTheyThe highest reported concentrations of TPHd in the confirmation soil samples are from the deep samples(20-30 feet bsg). <br /> They <br /> 0 <br /> pass the ESL screening levels except for gross contamination.Vapor influent concentrations to the SVE system were <br /> reported non-detect prior to system shutdown.The threat at this site for vapor intrusion is minimal. Compliance=with public <br /> participation requirements in section 2728 of the California Code of Regulations has been met. <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 />