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Snow <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Den's Auto Repair <br /> 308 South EI Dorado Street, Stockton, California <br /> III. Release and Site Characterization Information continued <br /> [ii-a—A—mumDocumented,Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Sail (ppm) Water (ppm) <br /> Before After Before After Before After Before I After <br /> TPH (Gas) 9,100 NA 36 13 Ethylbenzene 140 NA 1.0 0.057 <br /> TPH(Diesel) 11 NA NA NA Xylenes 790 NA 1.5 0.0711 <br /> TPH(Motor Oil) NA NA NA NA MTBE <0.05 NA 2.16 <0.001 <br /> Benzene 4.9 NA 8.4 0.64 1,2-DCA <0.05 NA 0.042 0.018 <br /> Toluene 35 NA 0.20 0.015 Lead 110 NA NA 0.002 <br /> Comments: The `Soil Before' concentrations for TPH (gas), benzene, ethylbenzene and xylenes are from sample TK3-N <br /> @ 16 feet on 04/26/95; toluene from T2-N @ 16 feet on 04/26/95; TPH (diesel) from SP4-A,B on 04/25/95; MTBE from B1- <br /> 20 on 06/23/97; 1,2-DCA from 134-55 on 09108/1997; and lead from P-1 at 4 feet on 04/26/1995. `Soil After' concentrations <br /> were not collected. The `Groundwater Before' concentrations for TPH (gas) are from MW-1A on 02/08/11; benzene from <br /> MW-2A on 02/17/06; toluene from MW-1A on 09/24/97; ethylbenzene from MW-1A on 11/20/98, xylenes from MW-213 on <br /> 09/24/97; MTBE from MW-1A on 09/23/99, and 1,2-DCA from MW-1A on 05/15/08. The `Groundwater After' <br /> concentrations for TPH (gas), benzene, toluene, ethylbenzene, xylenes, MTBE, and 1,2-DCA are from MW-1A on 02/15/12, <br /> and lead from MW-2A on 06/28/10. 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: No Number Decommissioned: 0 Number retained: 13 monitoring wells <br /> List enforcement actions taken: NOR on 05/21/96 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Program Coordinator <br /> Signature: Date: �3 <br /> VI Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James L.L. Barton Response: <br /> Title:Associate Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> An ozone bench scale test was completed in June 2010. Active remediation did not take place at this site. The State Water <br /> Board Cleanup Fund staff has recommended site closure. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br /> Page 2 <br />