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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 (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 836 5500 20.0 2.1 Xylene 46.5 <4.0 0.22 0.01 <br /> TPH (Diesel) 41DO 690 unk unk Ethylbenzene unk <2.0 0.49 0.048 <br /> Benzene 0.46 5.8 2.8 0.15 Oil &Grease 7100 3600 3.4 2.1 <br /> Toluene 7.43 <2.0 D.048 0.0051 MTBE unk <2.0 <.005 0.0046 <br /> Comments: Soil before concentrations are from samples collected beneath UST-B and Bunker-C at time of UST <br /> closure/removal in 1985. Soil after concentrations are from confirmation samples taken after soil excavation (remediation) <br /> activities in 2011. The ground water before and after concentrations are from MW-B which was located down-gradient of <br /> the source areas. MW-B was removed during soil excavation and replaced with MW-BR. MW-BR is approximately 20 feet <br /> down gradient of former MW-B. Soil results and ground water results are non-detect for all constituents(including TPH- <br /> diesel)for two consecutive sampling events since remediation. <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: 2 Number retained: 1 <br /> List enforcement actions taken: NOR sent to RP. <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Acting Program Coordinator <br /> Signature ` Date: rI � 2 0 <br /> Vt. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <br /> Title: Engineering Geologist <br /> VII. 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 />