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Record of Decision System (RODS)

ROCKY FLATS PLANT (USDOE)

Abstract

Site Name:  ROCKY FLATS PLANT (USDOE)
Address:  HWY 93 BETWEEN GOLDEN&BOULDER 
City & State:  GOLDEN  CO  80402
County:  JEFFERSON
 
EPA ID:  CO7890010526
EPA Region:  08
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R08-90/043
ROD Date:  01/05/1990
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, PCE, TCE, METALS, CHROMIUM, RADIOACTIVE MATERIALS
 
Abstract:  THE 6,550-ACRE ROCKY FLATS PLANT (DOE) SITE IS A FEDERAL FACILITY, WHICH SERVES AS A NUCLEAR WEAPONS RESEARCH DEVELOPMENT AND PRODUCTION COMPLEX IN JEFFERSON COUNTY, COLORADO. SURROUNDING LAND USE IS PRIMARILY RURAL RESIDENTIAL, ALTHOUGH THERE ARE SOME INDUSTRIAL PROPERTIES NEARBY. THE SITE OVERLIES AN ALLUVIAL/COLLUVIAL AQUIFER, AND A SMALL WETLANDS AREA IS PRESENT WITHIN THE FACILITY BOUNDARIES. SINCE 1951, ONSITE OPERATIONS HAVE INCLUDED THE MANUFACTURE OF NUCLEAR WEAPONS COMPONENTS FROM PLUTONIUM, URANIUM, BERYLLIUM, AND STAINLESS STEEL. THERE ARE TWELVE SITES, DESIGNATED AS SOLID WASTE MANAGEMENT UNITS, WHICH COMPRISE THE 881 HILLSIDE AREA. IN 1987, EPA IDENTIFIED VOC-CONTAMINATED GROUND WATER IN THE 881 HILLSIDE AREA LOCATED IN THE SOUTHEAST CORNER OF THE SITE NEAR A SURFACE STREAM. POSSIBLE SOURCES FOR THIS CONTAMINATION INCLUDED CHEMICAL AND OIL WASTE PITS, FUEL OIL TANKS, AND AN ASSOCIATED DRUM STORAGE AREA, ONSITE SOLVENT/OIL SPILLS AND LEAKS, AND SANITARY SEWER OVERFLOW DISCHARGE. THIS RECORD OF DECISION (ROD) ADDRESSES MANAGEMENT OF MIGRATION AND CLEANUP OF GROUND WATER IN THE 881 HILLSIDE AREA, AND IS AN INTERIM REMEDY. FINAL REMEDIATION OF THIS SITE WILL BE ADDRESSED IN A SUBSEQUENT ROD. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS INCLUDING PCE AND TCE; METALS INCLUDING CHROMIUM; AND RADIOACTIVE MATERIALS.
 
Remedy:  THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES INTERCEPTING CONTAMINATED GROUND WATER IN THE ALLUVIAL/COLLUVIAL AQUIFER USING A FRENCH DRAIN SYSTEM; TREATING THE CONTAMINATED WATER IN AN ONSITE TREATMENT PLANT USING FILTRATION FOLLOWED BY UV PEROXIDE TO REMOVE ORGANICS, AND ION EXCHANGE TO REMOVE INORGANICS; STORING THE TREATED WATER TEMPORARILY ONSITE DURING EFFLUENT QUALITY TESTING PRIOR TO DISCHARGING THE TREATED WATER TO AN ONSITE INTERCEPTOR DITCH; AND GROUND WATER MONITORING. THE ESTIMATED PRESENT WORTH COST FOR THIS REMEDIAL ACTION IS $4,588,200, WHICH INCLUDES AN ANNUAL O&M COST OF $258,100 FOR 30 YEARS.

PERFORMANCE STANDARDS OR GOALS; GROUND WATER CLEANUP STANDARDS WILL BE THE MORE STRINGENT OF FEDERAL MCLS OR MCLGS, OR STATE WATER QUALITY STANDARDS. CHEMICAL-SPECIFIC GOALS INCLUDE PCE 5 UG/L (STATE), TCE 5 UG/L (STATE), TRIVALENT CHROMIUM 0.05 MG/L (STATE), AND CHROMIUM 0.05 MG/L (STATE).
 
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