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Case Closure Summary Page 2 '' ! <br /> Leaking Underground Fuel Storage < Program <br /> III. Release and Site Characterization Information (continued), <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Sail Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After .Before After After Before After J <br /> TPH (Gas) 360 150 100 <.05 Xylenes 0.74 0.22 0.36 <.0005 <br /> TPH (Diesel) NA 1,700, NA 0.99 Ethylbenzene 0.25' 0.15 0.11 <-0005 <br /> Benzene 0.077 0.13 0.072 <.0005 Oil& Grease NA NA NA NA <br /> Toluene 0.18 0.10 0.099 <.0005 Heavy Metals 9.8 NA NA NA <br /> MTBE NA <.05 NA 0.31 <br /> Comments: SOIL AND WATER 'BEFORE' DATA FROM THE TANK PULL SAMPLE ANALYSES. SOIL 'AFTER',DATA <br /> FROM SOIL BORINGS. WATER 'AFTER' DATA FROM 6128103 QMS. THE MTBE 0.31 ppm RESULT IS FROW THE <br /> FURTHEST OFFSITE, CROSS-GRADIENT WELL THAT IS DOWN GRADIENT FROM 7-ELEVEN SITE AT 2360 <br /> GRANTLINE THAT HAS AN MTBE PLUME. ---NO ACTIVE REMEDIATION WAS PERFORMED AT THIS SITE-== <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: 6 Number Decommissioned: 6 Number retained: 2 <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 List enforcement actions rescinded: NONE 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 DEPT. <br /> Signature: Date: �-7 <br /> V1. Central Valley Regional Water Quality Control Board(RB) Notification <br /> Date Submitted to RB: 03/18/04 Response Date: 05/21/04 <br /> RB Staff: JAMES L.L. BARTON Response: CONCURRENCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> MONITORING WELLS NOT DESTROYED WERE RETAINED FOR USE BY AND TRANSFERRED OWNERSHIP TO <br /> NEIGHBORING LOP SITES. <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 />