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PUBLIC HEALTH ASSESSMENT

ROCKY MOUNTAIN ARSENAL
ADAMS COUNTY, COLORADO
CERCLIS NO. CO5210020769

September 30, 1996

Prepared by

AGENCY FOR TOXIC SUBSTANCES AND DISEASE REGISTRY
Division of Health Assessment and Consultation
Federal Programs Branch
Defense Facilities Assessment Section


TABLE OF CONTENTS

LIST OF FIGURES

LIST OF TABLES

GLOSSARY

SUMMARY

BACKGROUND

    Site Description and History
    Environmental Setting
    Geology and Soils
    Surface Water and Groundwater Hydrology
    Environmental Investigations and Controls
    Interim Response Actions (IRAs)
    Groundwater Treatment Systems That Affect Offpost Areas
    Off-Site Sources of Contaminants
    EPA Studies and the EPA Study Area (Chemical Sales Company)
    RMA Offpost Study Area and Operable Unit
    The Agreement for a Conceptual Remedy for the Cleanup of RMA and the Onpost and Offpost Records of Decision (RODs)
    Site Visit
    Demographics, Land Use, and Natural Resource Use
    Health Outcome Data

COMMUNITY HEALTH CONCERNS

ENVIRONMENTAL CONTAMINATION AND OTHER HAZARDS

    Toxic Chemical Release Inventory
    Onpost Contamination
    Offpost Contamination
    Quality Assurance and Quality Control
    Physical and Other Hazards

PATHWAYS ANALYSES

    Completed Exposure Pathways
      North Plume Group Pathway
      Northwest Plume Group Pathway
      Present and Possible Future Alluvial Aquifer Pathways
      Present and Possible Future Arapahoe Aquifer Pathway
      Commerce City -Irondale/Western Groundwater Plume Pathway
    Potential Exposure Pathways
      Potential Onpost Surface Soil and Sediment Pathway
      Potential Ambient Air Pathway
      Potential Foodchain Pathway
      Potential Irondale/Western Plume Group Pathway
      Potential Denver Formation Aquifer Pathway

PUBLIC HEALTH IMPLICATIONS

    Toxicological Evaluation
    Health Outcome Data Evaluation
    Community Health Concerns

CONCLUSIONS

RECOMMENDATIONS

PUBLIC HEALTH ACTION PLAN

PREPARERS OF REPORT

REFERENCES

APPENDIX A: ATSDR PUBLIC HEALTH HAZARD CONCLUSION CATEGORIES

APPENDIX B: DISCUSSION OF TOXICOLOGIC EVALUATION FOR TABLES 13 AND 14

APPENDIX C: ADDITIONAL INFORMATION RELATING TO COMMUNITY HEALTH CONCERNS

    More Information About Lupus
    More Information About Diabetes
    More Information on Multiple Chemical Sensitivity
    More Information About Asthma
    More Information About Breast Cancer
    More Information About Throat Cancer
    More Information About Stomach Cancer
    More Information About Bladder Cancer

APPENDIX D: PUBLIC COMMENTS


LIST OF FIGURES

Figure 1 - Location of Rocky Mountain Arsenal
Figure 2 - The Onpost and Offpost Operable Units (OU)
Figure 3 - The Onpost Operable Unit: Site Facilities and Locations
Figure 4 - Rocky Mountain Arsenal Wind Rose
Figure 5 - The generalized extent of groundwater contamination plumes in the Offpost Study Area, Rocky Mountain Arsenal
Figure 6 - Distribution of DIMP in the Offpost Study Area, 1990.
Figure 7 - Distribution of Dieldrin in the Offpost Study Area, 1990.
Figure 8 - General Trend for the Nitrate Levels in the RMA Offpost Study Area
Figure 9 - Historical Decline in the Concentration of DIMP, Offpost Study Area, RMA
Figure 10 - Access Restriction Areas, RMA


LIST OF TABLES

Table 1 - Contaminated Sites and Interim Response Actions
Table 2 - Interim Response Actions (IRAs) and Boundary Containment Systems (BCSs)
Table 3 - Rocky Mountain Arsenal Population and Housing Data Table
Table 4 - Summary of Remaining Pathways - Environmental Media and Mitigative Measures
Table 5A - Alluvial/Unknown Aquifer Drinking Water Contaminants of Potential Concern - Offpost Study Area
Table 5B - Denver/Arapahoe Aquifer Drinking Water Contaminants of Potential Concern - Offpost Study Area
Table 6 - Contaminants of Potential Concern: Onpost Alluvial Aquifer Groundwater Contributing to Irondale/Western Plume
Table 7 - Contaminants of Potential Concern: Off-Post Alluvial Aquifer Groundwater - Irondale/Western Plume
Table 8 - Contaminants of Potential Concern: Surface Water
Table 9 - Contaminants of Potential Concern: Surface Soil
Table 10 - Contaminants of Potential Concern: Sediment
Table 11 - Contaminants of Potential Concern: Air
Table 12A - Historical Range of Contaminants Detected in On- and Offpost Biota
Table 12B - Onpost contaminant accumulation: 1994 Biomonitoring Program
Table 13 - Recent (1991-1996) detections of drinking water well contaminants at levels of potential concern: Alluvial/Unknown Aquifer
Table 14 - Recent detections of drinking water well contaminants at levels of potential concern: Arapahoe Aquifer
Table 15 - Completed Exposure Pathways
Table 16 - Onpost surface soil contamination above comparison values
Table 17 - Detections of irrigation well contaminants at levels of potential concern: Alluvial/Unknown Aquifer
Table 18 - Potential Present and Future Exposure Pathways
Table 19 - Offpost Study Area Wells of Public Health Concern, April 1994


GLOSSARY
111TCE
112TCE
12DCE
11DCLE
12DCLE
ac
ALDRN
Army
AS
Atm
ATSDR
ATZ
BCHPD
BCS
BEMA
BDL
°C
CAR
CCL4
CD
CDM
CDPHE
CERCLA
cfs
CFS
CHCL3
CL6CP
CLC6H5
CLDAN
cm
CMP
CO
COC
CPMS
CPMSO
CPMS02
CR
CREG
CRL
CSC
CU
CV
DBCP
DCPD
DCA
DCE
12DCLE
DCPD
DDE
DDT
DDVP
DIMP
DITH
DL
DLDRN
DMMP
DOD
DOJ
dscm
EA
EBASCO
EMEG
EMPA
ENDRN
EPA
ESA
ESE
°F
FFA
FS
FS
ft
ft2
FY
g
GB
GC
GWTF
HARP
HASC
HASP
HG
HLA
IBCS
ICP
ICP metals
ICS
IMPA
IRA A
IRA
IRDMIS
IRP
IWTP
kg
lbs
LTHA
L-THA
MCL
MCLG
µg
µg/dL
µg/l
mg
mg/L
ml
ml/g
MKE
MRL
MW
m
MS
msl
N/A
ND
NBCS
NCSA
ng
NIT
NWBCS
NPL
OAS
OCP
ONC
OPHGB
OPHP
OSCH
OSCM
OSHA
OU
PAH
PB
PMRMA
PAH
PCB
pH
PHA
ppb
ppm
PRL
QA
QAP
QC
RAB
RDA
RfC
RfD
RfDC
RI
RIC
RI/FS
RISR
RLSA
RMA
RMACCPMT
RMAED
RMEG
SSAB
SACWSD
SAR
Shell
SHO
SPSA
sq
sq mi
SVOC
SA
TAL
TCA
TCHD
TCL
TCLEE
TIC
TMP
TRCLE
Tri-County
TSP
USAEC
USDA-SCS
UFS
USFWS
USCS
USGS
UST
UXO
VAO
VHC
VHO
VOC
WSA
yd2
yd3
1,1,1-Trichloroethane
1,1,2-Trichloroethane
1,1-Dichloroethene
1,1-Dichloroethane
1,2-Dichloroethane
acre(s)
Aldrin
U.S. Department of the Army
Arsenic
atmosphere/s
Agency for Toxic Substances and Disease Registry
Atrazine
Bicycloheptadiene
Boundary Containment System
Bald Eagle Management Area
below detection limit
degrees Celsius
Contamination Assessment Report
Carbon tetrachloride
Cadmium
Camp, Dresser, and McKee, Inc.
Colorado Department of Public Health & Environment
Comprehensive Environmental Response, Compensation and Liability Act
cubic feet per second
confined flow system
Chloroform
Hexachlorocyclopentadiene
Chlorobenzene
Chlordane
centimeters
Comprehensive Monitoring Plan
Colorado
contaminants of concern
Chlorophenylmethyl sulfide
Chlorophenylmethyl sulfoxide
Chlorophenylmethyl sulfone
Chromium
Cancer Risk Evaluation Guide
certified reporting limit
Chemical Sales Company
Consumptive Use (Study)
Comparison Value
Dibromochloropropane
Dicyclopentadiene
Dichloroethane
Dichloroethene
l,2-Dichloroethene
Dicyclopentadiene
2,2-bis(para-chlorophenyl)- 1-dichloroethene
2,2-bis(para-chlorophenyl)- 1,1-trichloroethane
Vapona
Diisopropylmethyl phosphonate
Dithiane
detection limit
Dieldrin
dimethylmethyl phosphonate
U.S. Department of Defense
U.S. Department of Justice
dry standard cubic meter
endangerment assessment
Ebasco Services, Inc.
Environmental Media Evaluation Guide
Ethylmethyl phosphonic acid
Endrin
U.S. Environmental Protection Agency
Eastern Study Area
Environmental Science and Engineering, Inc.
degrees Farenheit
Federal Facility Agreement
Feasibility Study
feasibility study
foot, feet
square foot/feet
fiscal year
gram
Nerve agent Sarin
gas chromatography
Groundwater Task Force
Health Activities Recommendation Panel
House Armed Services Committee
Health and Safety Plan
Mercury
Harding Lawson Associates
Irondale Boundary Containment System
inductively coupled plasma
metals analyzed for by ICP: including cadmium, chromium, copper, lead and zinc
Irondale Containment System
Isopropylmethyl phosphonic acid
Groundwater Intercept and Treatment System North of RMA
Interim Response Action
Installation Restoration Data Management Information System
Installation Restoration Program
Industrial Wastewater Treatment Plant
kilogram
pounds
Lifetime Health Advisory
Longer-term Health Advisory
Maximum Contaminant Level (drinking water)
Maximum Contaminant Level Goal (drinking water)
microgram/s
micrograms per deciliter
micrograms per liter
milligram/s
milligrams per liter
milliliter/s
milliliter per gram
Morrison-Knudsen Engineering
Maximum Risk Level
Monitoring Well
meter
mass spectroscopy
mean sea level
not applicable
not detected
North Boundary Containment System
North Central Study Area
nanogram
Nitrate-nitrite, non-specific
Northwest Boundary Containment System
National Priorities List
Organizations and State (EPA, Shell, Army, USFWS, and the State)
organochlorine pesticide
organonitrogen compounds
organophosphorous compounds, GB-related
organophosphorous compounds, pesticide-related
organosulfur compounds, herbicide-related
organosulfur compounds, mustard-agent-related
Occupational Safety and Health Administration
operable unit
polynuclear aromatic hydrocarbons
Lead
Program Manager for Rocky Mountain Arsenal
Polycyclic Aromatic Hydrocarbon
Polychlorinated Biphenyl
measure of acidity or alkalinity
Public Health Assessment
Parts Per Billion
Parts Per Million
Potential Release Location
quality assurance
Quality Assurance Plan
quality control
Restoration Advisory Board
Rcommended Daily Allowance
Reference Concentration
Reference Dose
Reference Dose Concentration
Remedial Investigation
Rocky Mountain Information Center
Remedial Investigation/Feasibility Study
Remedial Investigation Summary Report
R.L. Stollar Associates
Rocky Mountain Arsenal
Rocky Mountain Arsenal Contamination Control Program Management Team
Rocky Mountain Arsenal Environmental Database
Reference Dose Media Evaluation Guide
Site-Specific Advisory Board
South Adams County Water and Sanitation District
Study Area Report
Shell Chemical Company/Shell Oil Company
semivolatile halogenated organics
South Plants Study Area
square
square mile/s
semivolatile organic compound
Study Area
Target Analyte List
Trichloroethane
Tri-County Health Department
Target Compound List
Tetrachloroethene (PCE)
tentatively identified compound
Transition Monitoring Program
Trichloroethene/trichloroethylene (TCE)
Tri-County Health Department
total suspended particulates
U.S. Army Environmental Center
U.S. Department of Agriculture-Soil Conservation Service
unconfined flow system
U.S. Fish and Wildlife Service
Unified Soil Classification System
United States Geological Survey
Underground Storage Tank
Unexploded Ordinance
volatile aromatic organics
volatile hydrocarbons
volatile halogenated organics
volatile organic compound
Western Study Area
square yard/s
cubic yard/s


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