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Main Title

Superfund record of decision : Rocky Mountain Arsenal, (Offpost Site) Adams County, CO.

CORP Author

Environmental Protection Agency, Washington, DC. Office of Emergency and Remedial Response.

Publisher

[U.S. Environmental Protection Agency, Office of Emergency and Remedial Response], Distributed by the National Technical Information Service,

Year Published

1997

Report Number

EPA/ROD/R08-96/128

Stock Number

PB96-964412

Subjects

Hazardous waste sites--Colorado

Additional Subjects

Superfund ; Hazardous materials ; Water pollution control ; Army facilities ; Chlorides ; Sulfates ; Salts ; Pesticides ; Arsenic ; Phosphonates ; Aromatics ; Halogenated aliphatic hydrocarbons ; Ground water ; Aquifers ; Extraction ; Water treatment ; Attenuation ; Remedial action ; Colorado ; Record of Decision ; Rocky Mountain arsenal ; Adams County(Colorado) ; Cleanup

Internet Access

Description	Access URL
	https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=10004YP1.PDF

Holdings

Library	Call Number	Additional Info	Location	Last Modified	Checkout Status
NTIS	PB96-964412	Some EPA libraries have a fiche copy filed under the call number shown.		07/26/2022

Collation

1 volume (various pagings) : illustrations, maps ; 28 cm

Abstract

This decision document presents the selected remedial action for the Rocky Mountain Arsenal (RMA) Offpost Operable Unit (OU) in southern Adams County, east of Commerce City, Colorado. The Offpost OU addresses groundwater contamination north of RMA that migrated (1) before the RMA boundary groundwater extraction and treatment systems were installed, and (2) around the boundary systems prior to recent improvements. The selected remedy described in this Record of Decison (ROD) will permanently address contaminants at the site through treatment to reducce the toxicity, mobility, or volume of contaminants. The major components of the selected remedy are: Operation of the Offpost Groundwater Intercept and Treatment System; (Removal of contaminated groundwater from the alluvial and the weathered upper portion of the Denver Formation (hereafter called the unconfined flow system (UFS)) north of the RMA boundary in the First Creek and northern paleochannels using groundwater extraction wells; Treatment of the organic chemicals of concern (COCs) present in the groundwater using carbon adsorption; Recharge of treated groundwater to the UFS using wells and trenches); and Natural attenuation of inorganic chloride and sulfate concentrations to meet applicable standards of groundwater in a manner consistent with te Onpost remedial action.

Notes

Cover title. "12/19/1995." "PB96-964412." "EPA/ROD/R08-96/128." "April 1997." Microfiche.

Place Published

{Washington, D.C. :

Supplementary Notes