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.


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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


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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


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