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III Release and Site Characteriz*n Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 22,000 2,200 53 .520 Ethylbenene 320 26 2.3 <.0005 <br /> TPH(Diesel) 7,500 520 88 <.05 Xylene 1,830 172 10 <.0005 <br /> Benzene 1.1 4.5 .6 <.0005 MTBE <5 <.05 <.001 <.001 <br /> Toluene 460 31 3.5 <.0005 <br /> Comments: Soil Before data is from boring B2 at 15 feet on 10/15/02. Soil After data is from samples collected from the <br /> excavation after the most contaminated soil was removed in July 2007. Water Before data is from MW2 on 3/24/05. Water <br /> After data is from MW2 on 5/26/09, except the TPH diesel is from 11/25/08. 521 tons of contaminated soil was excavated <br /> from the site in July 2007 and groundwater concentrations have declined since then in MW2 (the only well with significant <br /> water contamination). <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 decommissioned: Yes Number Decommissioned: 7 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 List enforcement actions rescinded: None 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 Department <br /> Signatur Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 11/20/09 Response Date: 07/30/10 <br /> RB Staff: James L.L. Barton, PG Response: Concurrence <br /> Title: Associate Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> 11 None <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />