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PUBLIC HEALTH ASSESSMENT

TRAVIS AIR FORCE BASE (AFB)
UNITED STATES AIR FORCE
SOLANO COUNTY, CALIFORNIA


APPENDIX A: ACRONYMS AND ABBREVIATIONS

AFB Air Force Base
ATSDR Agency for Toxic Substances and Disease Registry

CPT

cone penetrometer testing
CREG Cancer Risk Evaluation Guide
DCA dichloroethane
DCE dichloroethene
DOD U.S. Department of Defense
EMEG Environmental Media Evaluation Guides

EPA

U.S. Environmental Protection Agency
IROD Interim Record of Decision
LLNL Lawrence Livermore National Laboratory
MCL

maximum contaminant level

µg/kg microgram per kilogram
µg/L microgram per liter
µg/m3 microgram per cubic meter
MRL Minimal Risk Level
MW monitoring well
NEWIOU North, East and West Industrial Operable Unit
ND not detected

NIOSH

National Institute for Occupational Safety and Health
NPL National Priorities List
OSHA Occupational Safety and Health Administration
OU operable unit
OVA Organic Vapor Analyzer
PCB polychlorinated biphenyl
pCi/g picoCuries per gram
ppmv parts per million per volume
ppb parts per billion
ppbv parts per billion per volume
PHA Public Health Assessment
RDX "Royal Dutch Explosive" ordnance compound, cyclotrimethylenetrinitramine
REL recommended exposure limit
RfC Reference Concentration
RI Remedial Investigation
ROD Record of Decision
TCE trichlorethylene

TPH

total petroleum hydrocarbon
VOC volatile organic compound


APPENDIX B: SOURCE SITE EVALUATION SUMMARY
Operable Unit Site Included Situations Evaluated in this Public Health Assessment Evaluation
East Industrial Operable Unit - Storm Sewer System
- Fire Training Areas #,2,3,4
- STP Sludge Disposal Area
- Solvent Spill Area
- Oil Spill Area
- STP Inactive - Oxidation Ponds
- Tanks and Spill Area at AAFES NSGS
- Facility 363/1201
- Aircraft Hardstand Area MW-329
- MW-269
- Facility 1205
- MW-246
- Storm Sewer System
- Fire Training Area #4
- AAFES NSGS (Gasoline Station)
- MW-269 (Bld. 1125)
These are sites with surface soil, sub-surface soil, soil gas, shallow groundwater and surface water contamination. Based on the information and data currently available for these sites, ATSDR concludes that there are no public health hazards associated with the areas not specifically described and evaluated in this PHA.

For the sites listed, but not specifically evaluated in this PHA:

  • No past exposures scenarios were identified

  • No current exposure scenarios were identified. Access to areas of soil and surface water contamination are not generally accessible to the public and employees do not generally work in the areas. Contaminated groundwater is not used by employees and has not reached off-base.

  • No future exposure scenarios were identified. Exposure to remediation workers and employees is minimized through implementation of Health and Safety Plans and environmental monitoring during clean-up activities
West Industrial Operable Unit - JP-4 Spill Area
- TF33 Test Stand
- Pipeline east of Facilities 810,818. 839, 842
- Aircraft Maintenance Hanger, North
- Aircraft Maintenance Hangers
- Facility 872
- Sanitary Sewer Line (between facilities 810, 919 and east of facilities 837, 838)
- None
West, Annexes, Base-wide Operable Unit - Landfill #3 and Grazing Management Unit 2
- Grazing Management Units 7&8
- Landfill X
- RB-1 Radioactive Waste Burial
- RB-2 Radioactive Waste Burial
- Grazing Management Units 7&8
- Landfill X
North Operable Unit - Landfill #1
- Landfill #2
- Cyanide Disposal Pit
- Landfill #1
- Landfill #2
Others - B-29 Crash Site
- Union Creek south of base
- B-29 Crash Site
- Union Creek south of base


APPENDIX C: ATSDR PUBLIC HEALTH CONCLUSION CATEGORIES


Category Definition Criteria
A. Urgent public health hazard This category is used for sites that pose an urgent public health hazard as the result of short-term exposures to hazardous substances.
  • evidence exists that exposures have occurred, are occurring, or are likely to occur in the future AND
  • •estimated exposures are to a substance(s) at concentrations in the environment that, upon short-term exposures, can cause adverse health effects to any segment of the receptor population AND/OR
  • community-specific health outcome data indicate that the site has had an adverse impact on human health that requires rapid intervention AND/OR
  • physical hazards at the site pose an imminent risk of physical injury
B. Public health hazard This category is used for sites that pose a public health hazard as the result of long-term exposures to hazardous substances.
  • evidence exists that exposures have occurred, are occurring, or are likely to occur in the future AND
  • estimated exposures are to a substance(s) at concentrations in the environment that, upon long-term exposures, can cause adverse health effects to any segment of the receptor population AND/OR
  • community-specific health outcome data indicate that the site has had an adverse impact on human health that requires intervention
C. Indeterminate public health hazard This category is used for sites with incomplete information.
  • limited available data do not indicate that humans are being or have been exposed to levels of contamination that would be expected to cause adverse health effects; data or information are not available for all environmental media to which humans may be exposed AND
  • there are insufficient or no community-specific health outcome data to indicate that the site has had an adverse impact on human health
D. No apparent public health hazard This category is used for sites where human exposure to contaminated media is occurring or has occurred in the past, but the exposure is below a level of health hazard.
  • exposures do not exceed an ATSDR chronic MRL or other comparable value AND
  • data are available for all environmental media to which humans are being exposed AND
  • there are no community-specific health outcome data to indicate that the site has had an adverse impact on human health
E. No public health hazard This category is used for sites that do not pose a public health hazard.
  • no evidence of current or past human exposure to contaminated media AND
  • future exposures to contaminated media are not likely to occur AND
  • there are no community-specific health outcome data to indicate that the site has had an adverse impact on human health


APPENDIX D: SOIL GAS SAMPLES (TCE, DCE, AND TPH) FROM STORM
SEWER B STUDY *

Sample ID Depth ( feet
below ground
surface)
Contaminant Concentration
(ppbv)
810-B01 15 TCE 3,618
810-B02 5
15
TPH-G
TCE
TPH-G
25,000
840
15,000
810-B03 9
15
TCE
DCE
TCE
DCE
54,000
22,000
33,000
23,000
810-B04 8
14.33
TCE
DCE
DCE
TCE
9,400
18,000
106
570
810-B05 15 TCE
TPH-G
101
73,000
810-B06 5
15
TPH-G
TPH-G
21,000
62,000
810-B07 6
10
TPH-G
TPH-G
16,000
10,000
S3-C04 6
10
TCE
TPH-G
TCE
772
18,000
128
S3-C06 5.5
9
TPH-G
TPH-G
310,000
1,195,000
SSSB-B01 4
9
TPH-G
TPH-G
2,700,00
4,000
SSSB-B02 4 TPH-G 300
SSSB-C01 6
10
TPH-G
TPH-G
23,000
23,000
SSSB-C02 6
10
TPH-G
TPH-G
5,900
14,000
SSSB-C03 10 TPH-G 2,800
SSSB-C04 10 TPH-G 12,000
SSSB-C05 4.5 TPH-G 3,500
SSSB-C06 9 TPH-G 4,100
SSSB-C12 4.5
9
TPH-G
TPH-G
180,000
2,800
SSSB-M01 10 TCE 510
1917-B01 5.5 TPH-G 4,100
* Other VOCs detected, in soil gas, but not at frequency or concentrations that present a possible health hazard. Figure 1: Location of Travis AFB
Figure 1: Location of Travis AFB
Figure 2: Travis AFB
Figure 2: Travis AFB
Figure 3: Duck Pond
Figure 3: Duck Pond
Figure 4: Buildings 810, 844, 845
Figure 4: Buildings 810, 844, 845
Figure 5: Landfill 1
Figure 5: Landfill 1
Figure 6: On-Base Gasoline Stations
Figure 6: On-Base Gasoline Stations
Figure 7: Groundwater Plumes (Migrating Offsite): Fire Training Area 4, Landfill 2, Building 1125
Figure 7: Groundwater Plumes (Migrating Offsite): Fire Training Area 4, Landfill 2, Building 1125
Figure 8: Union Creek
Figure 8: Union Creek
Figure 9: B-29 Crash Site
Figure 9: B-29 Crash Site
Figure 10: Grazing Areas - Landfill X and Grazing Management Units 7 & 8
Figure 10: Grazing Areas - Landfill X and Grazing Management Units 7 & 8



1. Abbreviations and acronyms are defined in Appendix A.

2. ATSDR and other agencies, such as the US EPA and California regulatory agencies have developed screening values or comparison values to provide guidelines for estimating minimum concentrations of a contaminant that may possibly cause adverse health effects, given a standard exposure rate and standard body weights. These values are used as screening mechanisms when evaluating contaminant levels detected in sample analyses to determine whether the levels found require more detailed examination.

3. Bioaccumulation is the term used to describe the increased concentration of a contaminant that occurs in a predator species as it consumes prey containing a contaminant.

4. The CREG is determined based on a 70 year lifetime exposure to this level. The benzene that might leak into this trailer would be at lower concentrations than the already low levels found in the crawlspace. And, because of the relatively short time for residents to be expected in these trailers, the exposure period is considerably less than the 70 years used in determining the CREG.

5. Screening values for the other chemicals are: acetone, 13,000 ppb (chronic EMEG/MRL); hexane 67.11 ppbv (RMEG/RfC); methanol, no threshold level, exposure to 250,000 ppb will cause temporary and reversible effects (headache) (18); xylene 100 ppb (MRL); pentane 120,000 ppb (NIOSH Recommended Exposure Limit (REL); propylene, no threshold limit for toxic effects, at high concentrations (part per hundred), propylene acts as an asphyxiant (19); and toluene, 1000 ppb (EMEG/MRL).

6. The study conducted by California was a large-scale study of the overall quality of fishery resources in the San Francisco Bay area.

7. CPT is a form of well installation that involves pushing a small diameter casing to a relatively shallow depth, rather than drilling a borehole and inserting casing in separate steps.

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