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Page 2 Leaking Underground Fuel Storage Tank Program <br /> Case Closure Summary <br /> Ill Release and Site Characterization information (continued) flet Cleanup <br /> Before and A (ppm) <br /> Contaminant Soil {ppm} Water <br /> Maximum Documented Contaminant Concentra trons- - After Before After <br /> Soil (ppm) Water (ppm) Before 0.01 <br /> Contaminant Before After 46.5 <4.0 0.22 <br /> Before After 2 1 Xylene0 4g 0.048 <br /> 836 5500 20.6 <2.0 <br /> TPN (Gas) 690 unk unk Ethylbenzene unk 3600 3.4 2.1 <br /> TPH(Diesel) 4100 0.15 Oil &Grease 7100 < O05 Q,OQ46 <br /> 0.46 5.8 2 8 unk <2.0 <br /> Benzene �2 0 0.048 0.0051 MTBtr <br /> Toluene 7.43 <br /> Comments: Soil before concentrations are from saa at os�colelmed bion) activities i Bu ns <br /> 201The ground water before and <br /> are from confirmation samples taken after soil exc <br /> L <br /> ncentrations are from MW-B which was located down-gradient of the source areas. MW-13 was removed during Soil <br /> tion and replaced with MW-BR. MW-BR was approximately 20 feet down gradient of former MW-B. Ground water <br /> from MW-BR were non-detect for all constituents (including TPH-diesel)for two consecutive sampling events since <br /> ation. MW-BR was destroyed by over-boring on 712012011. <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 /> MonitoringMapor wells decommissioned?: Yes Number Decommissioned:3 Number retained: 0 <br /> List enforcement actions taken: NOR sent to RP. <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: : Donna Heran, RBHS Title: Director <br /> Signature: Date: <br /> V1. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: July 5, 2011 Response Date: July 14, 2011 <br /> RB Staff: J. Barton Response: No Further Action Required Concurrence <br /> Title: Engineering Geologist <br /> V11. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site file. <br />