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Case Closure Summary Mage 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) Wafter (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 14,000 NA 2,706 12.0 Xylene 1,200 NA 4.9 1.41 <br /> TPH(Diesel) <20 NA <0.30 NA Ethylbenzene 250 NA 14 0.711 <br /> Benzene 39 NA 3.6 0.0903 Oil &Grease NA NA NA NA <br /> r <br /> oluene 450 NA 6.5 0.0305 Heavy Metals Pb 11 NA 0.05 NA <br /> MTBE <130 NA <13.0 NA <br /> Comments: The Soil Before Concentrations:Total Petroleum Hydrocarbon as gasoline(TPH-G), benzene(B),toluene (T), <br /> ethylbenzene (E),and xylene (X) are from UST2-7 at 6 feet bgs at the time of UST removal and soil excavation on <br /> 311011998; Total Petroleum Hydrocarbon as diesel (TPH-D) is from UST1-1 at 7.75 feet bgs at the time of UST removal and <br /> soil excavation on 2/23/1998.Lead result is from UST-3 East Wall at 7.5 feet bgs on 2/23/1998. No Soil After Concentrations <br /> are available; no soil confirmation samples were collected post- remediation/ORC injection. The Water Before <br /> Concentrations: TPH-G from HP-6 on 41211998; TPH-D from MW-4 on 12/16/1998; B from MW-6 on 1111611998; T from <br /> MW-6 on 11/16/1998; E from MW-6 on 4122/1999; X from HP-17 on 2/11/1999; and MTBE from HP-6 on 4/2/1998.Lead <br /> result is from UST-1 excavation grab sample collected on 2/2411998. The Water After Concentrations: TPH-G,B,T,E,and X <br /> are from MW-4 on 12/13/2010; MTBE was from MW-4 on 11912001; and TPH-D was not analyzed. <br /> NA=Not Analyzed <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: 8 Number retained:0 <br /> List enforcement actions taken: NOR sent to RPs; 10/21/1997,614/1999,9/1112000,9/28/2000,11/6/2000 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, RENS Title: Director <br /> Signature: v., <br /> — Date: <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 03/03/2013 Response Date: 03/22/2013 <br /> RB Staff: J. Barton Response: NFAR concurrence <br /> Title: EE9. Geologist <br /> VII.Additional Comments, Data, etc. <br /> This is LOP Case#2 at this address. The LOP Case#1 (RP was BBJ Trucking) and was unrelated to this release. Case <br /> #1 was in a separate area on the property and was closed in Feb.1997. Site recommended for closure by the SWRCB in <br /> correspondence dated 09/01/2010. <br /> This document and the related CASE CLOSURE LETTER, Shari be retained by the lead agency as Part of the official <br /> site file. <br />