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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> lI:I Release and Site Characterization Information (continued) <br /> FMaximumocumented Contaminant Concentrations--Before and After Caeanup <br /> Soil {ppm) Water (ppm) Contaminant Soil Before (ppm) Water Before (ppm) <br /> Before After Before . After After After <br /> TPH (Gas) 24,000 9.4 22 0.840 Xylene 1800 0.10 4.4 0.01.2 <br /> TPH (Diesel) 11,000 <10 <.05 NA Ethylbenzene .350 0.013 .9 0.016 <br /> Benzene 14 <0.005 3.1 0.0052 Oil &Grease NA <10 NA NA <br /> Toluene 680 <0.005 3.4 0.0012 Heavy Metals PB<5 NA NA NA <br /> MTBE .028 <.005 NA <0.001 <br /> 1,2-DCA NA NA .031 0.070 <br /> Comments: Soil Before data for TPH-g is from B6 at 11 feet;BTEX is from.139 at 11 feet, TPH-d is-from the beneath the <br /> waste oil UST removed in October 1986, MTBE is from beneath dispensers removed in March 1999 at 3 feet. Soil After <br /> data is from B17 except TPH-d and oil is from a side wall after the September 1987 over-excavation. Water Before data is <br /> from MW14 on 12/19/94 except TPH-d is from MW11 on 08/26/92 and 1,2=-DCA is from MW14 on 9110103. Water After data . <br /> is from MW13 on 4/1109 except.1,2-DCA!i's from MW17 on 411!09. Excavation of contaminated soil, soil vapor extraction, air <br /> sparging and;bio-sparging were conducted on site. The 1,2-DCA is in an off-site monitoring well. It was estimated that <br /> ii <br /> water quality objectives will be met in 13 years.. There are no known receptors. <br /> IV. Closure <br /> Does completedcorrective action protect existing beneficialf 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: 16 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 List enforcement actions rescinded: None 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 /> i, Name: Donna Heran, RENS Title: Director <br /> ( Signature:_ _ Date: <br /> ' V!. Central Valley Regional Water Quality,Control Board RB, Notification <br /> Date Submitted to RB: Response Date:12/11/2009 <br /> RB Staff: J. Barton Response:NO FURTHER ACTION REQUIRED <br /> Title: Eng. Geologist CONCURRENCE, 3 DECEMBER 2009 <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 <br /> site file. <br />