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R ` - <br /> 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 Be#ore (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH(Gas) 87.8 5.87 15.0 5.1 Xylenes 9.43 0.019 1.60 0.034 <br /> TPH (Diesel) 25.6 NA NA NA Fthylbenzene 1.46 <0.005 0.710 0.0042 <br /> Benzene <0.1 X0.005 0.50 0.0034 Oil &Grease 247 NA NA NA <br /> Toluene <0.1 0.017 <0.01 0.0083 Heavy Metals 21.5 (Pb) NA NA NA <br /> MTBE 0.194 0.079 10.0 0.016 <br /> Comments: Soil Before' data from piping line sample L-4 @ 5' bsg; EXCEPT: TPHd, Oil & Grease and Pb samples from <br /> waste oil tank pit. Soil 'After' data from dispenser sample D-2 @ 6' bsg, located next to P-1. All water data is from MW-4; <br /> 'Before' data from 02/16/99 sampling event; 'After' data from 01/07/10 sampling event. All soil analyses pass the ESL's. <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: 18 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA HERRN, REHS Title: DIRECTOR, ENVIRONMENTAL HEALTH DEPT. <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 06/15/10 Response Date: 06/30/10 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> The site is part of the City of Stockton's Weber Points Events Center, part of a waterfront park and parking lot; site usage is <br /> not likely to change. Part of this site is incorporated in the DTSC'S Covenant to Restrict Use of Property Environmental <br /> Restriction recorded document#2002-196806 i.e.:.no further development or occupancy of the site may occur. <br /> This document and the related CASE CLOSURE LETTER Shall be retained by the lead agency as part of the official site file. <br />