svEPA United States Environmental Protectior Agency Superfund Site Activities Update West County Road 112 Ground Water Site Midland, Midland County, Texas October 2012 This Fact Sheet will tell you about... • Current Investigation Activities • Past Actions • For More Information Current Investigation Activities • The total chromium concentrations from the June 2012 site-wide ground water sampling event are plotted on the attached figure. The chromium concentration data was collected from private wa- ter supply wells, monitoring wells installed by the EPA, and other available monitoring wells in the area. The total length of the chromium plume ex- ceeding the 100 micrograms per liter drinking wa- ter standard is approximately 1 Vi miles. Chromi- um concentrations in ground water exceeding 10 micrograms per liter have been detected across an area approximately 2 miles in length. The ground water data represents the chromium concentra- tions present in the Ogallala aquifer or upper wa- ter bearing sands beneath the site. • Letters were mailed to residents with the laborato- ry results for samples collected in June 2012 from their residential wells. face soil as a result of past use of contaminated ground water to water yards and gardens at pri- vate residences. The initial sampling efforts will focus on residences located within the chromium plume between West County Road 110 and West County Road 114. • A work plan is being developed to collect data on the physical characteristics of the Ogallala aqui- fer. This data will be used in the assessment of different alternatives for the cleanup of contami- nated ground water. • A pilot test work plan is being developed to assess a potential treatment alternative that can convert the mobile form of hexavalent chromium in the ground water to the immobile form of trivalent chromium. This treatment alternative uses injec- tion wells to deliver commercially available prod- ucts into the ground water for the treatment of the hexavalent chromium. • The Texas Commission on Environmental Quality (TCEQ) has installed and maintains the treatment systems on wells that have been identified with chromium concentrations exceeding the drinking water standard of 100 micrograms per liter. • The highest observed chromium concentrations remain south of the 1-20 corridor in the private water supply wells. The maximum chromium concentration is 5,310 micrograms per liter in a well along West County Road 112. • Chromium concentrations observed north of 1-20 are significantly less. The maximum chromium concentration is 830 micrograms per liter in moni- toring well WMW-31A located along the 1-20 ac- cess road. • A sampling plan is being developed to collect data on chromium concentrations in residential surface soil. The objective of the sampling is to determine if hexavalent chromium is accumulating in sur- Past Actions • EPA previously completed sampling of the pri- vate water supply wells in November 2010, April 2011, and May 2011. EPA completed installation of 35 monitoring wells during three separate events in May 2011, December 2011, and May 2012. • The West County Road 112 Ground Water Site (Site) is a ground water plume of chromi- um/hexavalent chromium. The EPA published a rule in the Federal Register on March 10, 2011, placing the West County Road 112 Ground Water Plume Site on its National Priorities List (NPL). The NPL is EPA's list of uncontrolled or aban- doned hazardous waste sites. ------- LMW-403 2 6.1 inset See Inset H|t;GW-i65. I ^3p< ™ <^GW-503 « ,-|GW-2! GW-252.0 S&ijSHhm \GW-164 -rw, o - O0W-2 %GW?166 V" t "GW-114 •• V-<%o ovwr^J « ». Monitoring well Sample location Sample location with filtration system Well designation Total Chromium concentration Spg/L) EA ENGINEERING, SCIENCE, AND TECHNOLOGY, INC. DESIGNED BY DWR WEST COUNTY ROAD 112 GROUND WATER PLUME SITE MIDLAND COUNTY, TEXAS DRAWN BY CRS CHECKED BY DWR SCALE 1:12,000 Concentrations of Total Chromium in Ground Water Ogallala (Shallow Zone) Aquifer June - August 2012 DATE 10/4/2012 PROJECT NO 1434265 FIGURE ------- For more information on the Site: Vincent Malott, Remedial Project Manager U.S. EPA Region 6, Superfund Division (6SF-R) 214.665.8313 or 1.800.533.3508 (toll-free) Email: malott.vincent@epa.gov Jason McKinney, Community Involvement Coordinator U.S. EPA Region 6, Superfund Division (6SF-VO) 214.665.8132 or 1.800.533.3508 (toll-free) Email: mckinnev.iason@epa.gov Danielle Sattman, Project Manager Texas Commission on Environmental Quality 512.239.0158 or 1.800.633.9363 (toll-free) Email: danielle.sattman@tceq.texas.gov For press inquiries, please call the EPA Region 6 Press Office at 214.665.2200. Information Repository Midland County Public Library 301 W. Missouri Ave. Midland, TX 79701 Phone: 432.688.4320 You can find more information about the Region 6 Superfund program on EPA's Region 6 Web Site: http://www.epa.gov/region6/superfund. Call U.S. EPA at 1.800.533.3508 to receive a Spanish translation of this Fact Sheet. Para recibir una traduction en espanol de esta Hoja de Datos, comunicase con la Agencia de Protection del Medio Ambiente de los EEUU (la EPA) al numero de telefono 1.800.533.3508 (llamada gratis). *»EPA United States Environmental Protectior Agency Region 6 1445 Ross Ave. (6SF-VO) Dallas, TX 75202 ------- |