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�f <br /> 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 Before (ppm} <br /> Before After I Before After .Before After After <br /> TPH (Gas) 24,000 9.4 22 0.840 Xylene 1800 0.10 4.4 0.012 <br /> TPH(Diesel) 11,006 <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 3A 0.0012Heavy Metals PB<5 NA NA NA <br /> MTBE .028 <.005 NA <0.001 <br /> 1,2-DCA NA NA .031 . 0.070 <br /> I� Comments: Soil Before data for TPH-g is from B6 at 11 feet, BTEX is from B9 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 MW 14 on 12/19/94 except TPH-d is from MW 11 on 08/26/92 and 1,2-DCA is from MW 14 on 9110103. Water After <br /> data is from MW13 on 411/09 except 1,2-DCA is from MW17 on 411109. Excavation of contaminated soil, soil vapor. <br /> I extraction, air sparging and bio-sparging were conducted on site. The 1,2-DCA.is in an off.-site monitoring well. Itwas <br /> estimated that water quality objectives will be met in 13 years. There are no.known receptors. <br /> I' IV. Closure ` <br /> 4 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 /> 4 Should corrective action be reviewed if land use changes?Yes <br />�4. <br /> MonitoringNapor wells decommissioned: Yes Number Decommissioned. 8 Number retained:�&I <br /> i List enforcement actions taken:'NOR sent to RP <br /> List enforcement actions rescinded: None <br /> 1 V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Program:Coordinator <br /> Signature: Date: t4 13 b <br /> Vl. Central Valley Re ions ater Quality Control Board RB .Notification <br /> -Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <br /> Title: Eng. Geologist - <br /> VII. Additional Comments; Data, etc. <br /> This document and the related CASTE CLOSURE LETTER, Shall be retained,by the lead agency as part of the official <br /> i site file. <br />,f <br />