Laserfiche WebLink
Leaking Underground Fuel Storage Tank Program ` <br /> III Release and Site Characterization Information continued 595 E. 11th Street, Trac <br /> FMaximum7D7ocu7men' ted Contaminant Concentrations - Before and After Cleanup (OVER-EXCAVATION) <br /> nant Soil <br /> FAer)q <br /> Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> BeforeBefore After Before After Before Afters) 8,300 1,900 0.130 Xylene 2,602 900 74 <0.001 <br /> sel) 29,800NA 0.130 MTBE NA <1 <,0005 <0.0005 <br /> 37 3.1 <0.0005 1,2-DCA NA <1 NA <0.0005 <br /> Toluene •1097 7.4 <0.0005 <br /> Ethyl-benzene 323 64 <0.0005 <br /> Comments: NA= not analyzed. <br /> Soil "before" data is'from UST removal in 1990, except TPHg at 8,300 mg/kg is from soil boring "PB-19" and <br /> benzene at 37 mg/kg is from soil boring "PB-15" in 2001. Soil "after" data is from post excavation pit sample S- <br /> 10-1 W-20 in 2004. Water "before" data for benzene and MTBE is from MW9 on 10/17/01, for TPH, toluene, <br /> ethyl-benzene and xylene is from boring "PB-8" in 1996. Water "after' data is from last ground water sampling <br /> event, Oct-2008. Excavation of the contaminated soil and extraction of groundwater in 2004 reduced the total <br /> mass of contaminants remaining in soil that could leach into the groundwater and contaminated groundwater. 11 <br /> 4� <br /> IV. Closuret <br /> Does completed corrective action protect existing beneficial uses per Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per 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 /> Have the Monitoring Napor wells been decommissioned? Yes Number Decommissioned: 9 <br /> Number retained: 0 k <br /> List enforcement actions taken: NOR 03-20-1992 <br /> i <br /> List enforcement actions rescinded: none <br /> V. Local Agency Re resentative Data <br /> Name: Donna Heran, REHS Title: Director of Environmental Health <br /> Signature: —', Date: �D_ I q_O <br /> Vl. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 05/06/2009 Response Date: 05/15/2009 <br /> RB Staff: James L.L. Barton Response: concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> 11 Soil vapor intrusion samples taken May 2007. All samples below residential ESLs. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the <br /> official site file. <br /> MI/ 10-09 <br /> l <br />