*»EPA Major Construction Activities Completed
United States Grants Chlorinated Solvents Plume Superfund Site
Agencymental Protectlori Grants, Cibola County, New Mexico November 2012
This Fact Sheet will tell you about...
• About the Site
• Selected Remedy
• Completion of Maj or Construction Activitie s
• Future Activities
• How to Get More Information
ntroduction
The U.S. Environmental Protection Agency (EPA),
in cooperation with the New Mexico Environment
Department (NMED), has completed major con-
struction activities relating to the treatment of
groundwater at the Grants Chlorinated Solvents
Plume (GCSP) Site (Site). A multi-pronged ap-
proach was used at this Site to treat groundwater
and protect the public from exposure to contamina-
tion. The remedy was presented in EPA's Record of
Decision (ROD) and defined by the Remedial De-
sign (RD).
The GCSP Site consists of an area of contaminated
groundwater containing chlorinated solvents at con-
centrations greater than EPA drinking water stand-
ards or maximum contaminant levels (MCLs). The
presence of chlorinated solvents in groundwater at
the Site is a result of past releases from nearby dry
cleaning operations. See the map on page 3.
Selected Remedy
Briefly the following is what has been accom-
plished to address the vapor intrusion and ground-
water plume:
1. To address indoor air issues - EPA installed
vapor mitigation systems
2. The source of the contamination - EPA
treated with a thermal treatment
3. To treat the groundwater plume - EPA used
enhanced reduced dechlorination (ERD).
This is a bio-remediation solution to treat
contamination in groundwater.
Major Construction Activities Completed
• EPA installed vapor intrusion mitigation
systems (VIMS) in 15 residences within the
footprint of the groundwater plume. The
VIMS do not treat indoor air, but rather pre-
vent vapor intrusion. These systems will op-
erate until the groundwater remedy reduces
chlorinated solvent concentrations such that
vapor intrusion is not occurring.
• EPA installed 573 injection wells through-
out the contaminated area. The wells were
installed primarily within the public rights-
of-way and private property where neces-
sary.
• EPA injected emulsified vegetable oil into
all of the injection wells to stimulate the bi-
odegradation of the chlorinated solvents
(picture on page 2). Groundwater and soil
vapor monitoring has been conducted week-
ly to quarterly to assess treatment effective-
ness.
• EPA constructed and decommissioned the
In-Situ Thermal Treatment (ISTT) sys-
tem in the contamination source area.
Thermal treatment was recently completed
in the source area to treat 33,300 cubic yards
of soil. The soils were heated to 100° C for a
period of six months to drive the contami-
nants bound in the soil. The heating was
terminated after clean up goals were met for
the soil. About one thousand pounds of chlo-
rinated solvents vapor was extracted from
the source area and treated during the ther-
mal heating process.
Future Activities
Although major construction activities are complet-
ed, residents can expect some minor decommission-
ing work ongoing until the end of this year. During
this period, the EPA will install vapor mitigation
systems in three locations across the plume as a
proactive measure. After that crews will be back
periodically to monitor groundwater, vapors, and
conduct vegetable oil injections. The frequency of
these events will diminish in the future and will end
when all of the groundwater contamination is
cleaned up. It is expected to take approximately 20
years or less before groundwater is completely
cleaned.
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The EPA will be conducting five-year reviews at
the site to ensure the remedy is protecti ve. Prior to
the beginning or after each five-year review, the
EPA will conduct a public session to inform the
community about current site conditions. The first
five-year review is due in 2013 and is currently in
progress.
For a complete source of information on the history
of the GCSP Site, please refer to the documents
within the Administrative Record (AR) File. The
EPA encourages the public to review these docu-
ments in order to gain a more comprehensive under-
standing of the GCSP Site, the Superfund activities
that have been conducted there, and the various al-
ternatives that have been developed and evaluated
to address the contamination at the GCSP Site. The
AR File is available at the following information
repository:
University of New Mexico, Grants Campus Library
1500 Third Street
Grants, New Mexico 87020
For questions or requests for additional information
regarding proposed field activities at the GCSP Site,
please contact the EPA Remedial Project Manager:
Sai Appaji
EPA Region 6 Remedial Project Manager
1445 Ross Avenue
Dallas, Texas 75202-2733
214.665.3126 or toll-free 800.533.3508
Appai i. sai@epa. gov
Emulsified Vegetable Oil Injection Trailers
Jason McKmney
EPA Region 6 Community Involvement
Coordinator
1445 Ross Avenue
Dallas, Texas 75202-2733
214. 665.8132 or toll-free 800.533.3508
Mckinnev .i ason@epa. gov
Steve Jetter
Project Manager
New Mexico Environment Department
505.827.0072
Steve. i etter@ state. nm. u s
On The Web...
On the internet, information about U.S. EPA Region
6 and The Superfund Program can be found at:
http://www.epa.gov/region6/6sf/pdffiles/grants-
chlor-nm.pdf
Information about U.S. EPA Region 6 and the Su-
perfund Program can be found at:
http://www.epa.gov/region6/superfund
Call U.S. EPA at 800.533.3508 (toll-free) 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 800.533.3508 (llamada gratis).
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United States
Environmental Protection
Agency
Region 6
1445 Ross Ave. (6SF-VO)
Dallas, TX 75202
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