Dugway Proving Ground Restoration Advisory Board Meeting

2. 2 UPDATE RCRA Facility Investigation Emily Hart Hayes Senior Scientist, Parsons

3. 3 Presentation Status of RFI for SWMUs Work Completed Since November 2007 Current Field Work Future Work Activity Briefing: Sub-slab Soil Vapor Sample Results and Preliminary Human Health Risk Results at Ditto Technical Laundry Facility (SWMU-177)

4. 4 RCRA Corrective Action Process Solid Waste Management Units (SWMU) Definition "Any discernible unit at which solid wastes have been placed at any time, irrespective of whether the unit was intended for the management of solid or hazardous waste. Such units include any area at a facility at which solid wastes have been routinely and systematically released." Four Main Steps RCRA Facility Assessment (RFA) RCRA Facility Investigation (RFI)– Phase I RCRA Facility Investigation (RFI)– Phase II Corrective Measures Study (CMS) This slide summarizes the definition of a SWMU and lists the four main steps of the Corrective Action process. Parsons is currently focused on completing the Phase II RFI at most of the SWMUs.This slide summarizes the definition of a SWMU and lists the four main steps of the Corrective Action process. Parsons is currently focused on completing the Phase II RFI at most of the SWMUs.

5. 5 Report Process RFI reports undergo 3 iterations DRAFT: Internal Army review includes DPG and Corps of Engineers; comments submitted and resolved DRAFT-FINAL: Submitted to UDEQ for review; comments submitted and resolved FINAL: Incorporates all UDEQ comments; legally-binding document incorporated into DPG’s RCRA Part B Permit Same process for other documents (e.g., Work Plans; Work Plan Variances) RFI reports undergo a series of three iterations before they are approved. These include a Draft, Draft-final, and Final Versions. This slide summarizes each of these steps. A similar process is followed for most other Dugway documents.RFI reports undergo a series of three iterations before they are approved. These include a Draft, Draft-final, and Final Versions. This slide summarizes each of these steps. A similar process is followed for most other Dugway documents.

6. 6 Status of RFI SWMUs Priority 1 (32 SWMUs ) 21 SWMU RFI Final Reports DSHW Approved SWMUs 3, 16, 17, 18, 21, 44, 52, 54, 65, 79, 98, 172, 180, 194 (A,B,C), 199, 200, 207, 212, 213, and 215 4 SWMU RFI Final Reports in Preparation SWMUs 41, 60, 173, and 177 4 SWMUs in RFI Draft Stage SWMUs 4, 32, 192, and 208 2 SWMUs with Upcoming Removal Actions or Further Investigation Needed SWMUs 15 and 35 SWMUs have been divided into two groups: the Priority 1 group, which were those sites thought to represent the most immediate need for investigation and remediation, and Priority 2 sites, where the risk to human health and the environment was considered less, but where an investigation was needed nonetheless. This slide summarizes the status of Priority 1 SWMU sites and where they are in the investigation In the interest of time, I won’t regurgitate the contents of this slide right now, but you can review it in detail by looking at the slide handouts that we’ve prepared. Reports that have changed include 41, 173, and 177SWMUs have been divided into two groups: the Priority 1 group, which were those sites thought to represent the most immediate need for investigation and remediation, and Priority 2 sites, where the risk to human health and the environment was considered less, but where an investigation was needed nonetheless. This slide summarizes the status of Priority 1 SWMU sites and where they are in the investigation In the interest of time, I won’t regurgitate the contents of this slide right now, but you can review it in detail by looking at the slide handouts that we’ve prepared. Reports that have changed include 41, 173, and 177

7. 7 Status of RFI SWMUs (cont.) Priority II (39 SWMUs) 33 SWMU RFI Final Reports Approved by DSHW SWMUs 6, 8, 10, 19, 23, 25, 56, 56B, 75, 77, 97, 113, 115, 116, 118, 133, 150, 154, 171, 179, 183, 185, 188, 189, 193, 197, 201, 205, 206, 211, 214, and 216 1 SWMU RFI Final Report in Review by UDEQ SWMU 61 3 SWMUs with RFI Reports in Draft Stage SWMUs 31, 209, 210 1 SWMU with Draft Final Report in Preparation SWMU 11 1 SWMU with Upcoming Removal Actions or Further Investigation Needed SWMU 114 This slide summarizes the status of the priority II sites, and again, I won’t spend too much time here except to say that of the 39 sites that were originally listed, 33 of those have now been fully investigated and the investigation results and recommendations have been reviewed and approved by the UDEQ.This slide summarizes the status of the priority II sites, and again, I won’t spend too much time here except to say that of the 39 sites that were originally listed, 33 of those have now been fully investigated and the investigation results and recommendations have been reviewed and approved by the UDEQ.

8. 8 Work Completed Since November 2007 Reports Submitted Final RFI Report for SWMU-61 Draft RFI Reports for SWMUs 4, 32, 60, 192, 209, and 210 Responses to State Comments on three RFI Reports (SWMUs 41, 61, 173) Work plan for SWMU-15 (surface soil sampling)

9. 9 Work Completed Since November 2007 (cont.) Field Work (Spring, 2008) Groundwater and surface soil sampling at SWMU-11 Additional Round of groundwater and soil boring sampling at SWMU-97 for groundwater remediation research. Removal Actions (Winter 2007/2008) Waste at SWMU-31 Drums at SWMU-208 Waste at SWMU-209 Waste at SWMU-210 Here is a summary of the field work we’ve completed over the winter since the last RAB in November. The next series of slides shows some photos of this field work and gives you a better idea of what was involved.Here is a summary of the field work we’ve completed over the winter since the last RAB in November. The next series of slides shows some photos of this field work and gives you a better idea of what was involved.

10. 10 One of the major projects was installation of monitoring wells at SWMU-11, where Beryllium-containing propellant was burned within trenches and radioactive waste was stored. Due to the presence of granite bedrock at this site, only one well was successfully drilled to completion; The second was abandoned after multiple rig failures, soil samples were collected at the bedrock interface in lieu of groundwater samples. One of the major projects was installation of monitoring wells at SWMU-11, where Beryllium-containing propellant was burned within trenches and radioactive waste was stored. Due to the presence of granite bedrock at this site, only one well was successfully drilled to completion; The second was abandoned after multiple rig failures, soil samples were collected at the bedrock interface in lieu of groundwater samples.

11. 11 A removal action was initiated at SWMU-208, east of Carr, where partially buried drums of unknown content were found. Because of there unknown contents, Dugway’s chemical agent handlers were brought in to conduct the sampling of the drums, with oversight by parsons. Sampling of drums shoed that they contained decontamination solution.A removal action was initiated at SWMU-208, east of Carr, where partially buried drums of unknown content were found. Because of there unknown contents, Dugway’s chemical agent handlers were brought in to conduct the sampling of the drums, with oversight by parsons. Sampling of drums shoed that they contained decontamination solution.

12. 12 The drums were removed from the bank and placed into overpacks so they could be safely transported to a hazardous waste storage unit.The drums were removed from the bank and placed into overpacks so they could be safely transported to a hazardous waste storage unit.

13. 13 The RFI is still on-going at this site. The RFI is still on-going at this site.

14. 14 Another removal action was completed on surface debris at SWMU-209, northwest of Baker.Another removal action was completed on surface debris at SWMU-209, northwest of Baker.

15. 15 This RFI is in Draft status and the site is expected to be close with No Further Action.This RFI is in Draft status and the site is expected to be close with No Further Action.

16. 16 The site was cleaned of all debris.The site was cleaned of all debris.

17. 17 Another removal action was conducted at SWMU-210, a disposal site comprised primarily of various broken glassware.Another removal action was conducted at SWMU-210, a disposal site comprised primarily of various broken glassware.

18. 18 In addition to the bermed area where most of the glassware was disposed of, glassware was also scatter on the ground surface throughout the site. Removal consisted fo excavating the contents and underlying soil in the burmed area and removal by hand the pieces of broken glass scattered on the ground surface.In addition to the bermed area where most of the glassware was disposed of, glassware was also scatter on the ground surface throughout the site. Removal consisted fo excavating the contents and underlying soil in the burmed area and removal by hand the pieces of broken glass scattered on the ground surface.

19. 19 This photo depicts the site after removal and backfilling The RFI for SWMU-210 is in Draft StatusThis photo depicts the site after removal and backfilling The RFI for SWMU-210 is in Draft Status

20. 20 Future Field Work This slide lists some of the future field work projects coming up for the remaining summer and Fall field season. Additional work will include surface soil sampling at SWMU-15 and removal actions at SWMUs 35 (which is the former water treatment plant at Baker, 4 (Granite Peak Installation-2 (GPI-2), BWA testing facility) and 114 (Former Baker Lab water treatment plant) This slide lists some of the future field work projects coming up for the remaining summer and Fall field season. Additional work will include surface soil sampling at SWMU-15 and removal actions at SWMUs 35 (which is the former water treatment plant at Baker, 4 (Granite Peak Installation-2 (GPI-2), BWA testing facility) and 114 (Former Baker Lab water treatment plant)

21. 21 Future Report Activity This slide summarizes some of the report activity that we will be working on between now and the next RAB. Most of the report work will focus on getting the draft versions of RFI reports out for the 8 sites listed here. This slide summarizes some of the report activity that we will be working on between now and the next RAB. Most of the report work will focus on getting the draft versions of RFI reports out for the 8 sites listed here.

22. 22 BRIEFINGSWMU-177 Sub-Slab Soil Vapor Sample and Preliminary Human Risk Assessment Results So that wraps up the summary of the RFI portion of Parsons work. At the last RAB meeting, Jeff Fitzmayer presented the sub-slab soil gas sampling that was conducted at the Technical Laundry Building (SWMU-177). For the second half of the presentation, I’d like to give a brief overview of the results of recent sub-slab soil gas sampling and preliminary human health risk assessment results at SWMU-177. So that wraps up the summary of the RFI portion of Parsons work. At the last RAB meeting, Jeff Fitzmayer presented the sub-slab soil gas sampling that was conducted at the Technical Laundry Building (SWMU-177). For the second half of the presentation, I’d like to give a brief overview of the results of recent sub-slab soil gas sampling and preliminary human health risk assessment results at SWMU-177.

23. 23 SWMU-177 Technical Laundry Building PCE (tetrachloroethylene) previously used in dry cleaning at technical laundry building PCE soil gas plume Screening results indicated potential for human health risks from vapor intrusion pathway Screening PCE concentrations from soil samples within the red countour north of the building exceeded 1000 ug/L (max = 1300 ug/L) Risk Hazard Tetrachloroethylene (PCE) 6.2E-04 8.4E+00 Screening PCE concentrations from soil samples within the red countour north of the building exceeded 1000 ug/L (max = 1300 ug/L) Risk Hazard Tetrachloroethylene (PCE) 6.2E-04 8.4E+00

24. 24 What is Human Risk Assessment? Method to determine whether concentrations of contaminants in the environment have the potential to cause adverse health impacts to people that may come into contact with those contaminants. Vapor Intrusion is one exposure pathway by which people may be exposed to contaminants in the environment. The State of Utah regulates the level of risk Acceptable risk for industrial uses is 1 in 10,000 Exceed Cancer Risk, HQ of one To give you a better idea of what this means in terms of “every day” risks, the background cancer rate for the US is 1 in 3 (1 in three will get cancer over their lifetime) the chances of dying in a plane crash are 1 in 1,000,000 to 10 in 10,000,000 the chances of dying in a car crash are 1 in 6,000 the chances of dying of heart disease are 1 in 280 the chances of winning a State Lottery are about 1 in 1,000,000 Acceptable risk for industrial uses is 1 in 10,000 Exceed Cancer Risk, HQ of one To give you a better idea of what this means in terms of “every day” risks, the background cancer rate for the US is 1 in 3 (1 in three will get cancer over their lifetime) the chances of dying in a plane crash are 1 in 1,000,000 to 10 in 10,000,000 the chances of dying in a car crash are 1 in 6,000 the chances of dying of heart disease are 1 in 280 the chances of winning a State Lottery are about 1 in 1,000,000

25. 25 What is the Vapor Intrusion? Vertical migration of volatile organic compounds (VOCs) from subsurface contamination (soil vapor) into the indoor air of a building. If VOCs migrate into indoor air, they can be inhaled by people and potentially cause human health problems (exposure pathway is complete). If VOCs do not migrate into indoor air, the pathway is incomplete and there is no potential for human health risk (exposure pathway is not complete). What is the Vapor Intrusion? Vertical migration of volatile organic compounds (VOCs) from subsurface contamination (soil vapor) into the indoor air of a building. If VOCs migrate into indoor air, they can be inhaled by people and potentially cause human health problems (exposure pathway is complete). If VOCs do not migrate into indoor air, the pathway is incomplete and there is no potential for human health risk (exposure pathway is not complete).

26. 26 What is Sub-slab Soil Vapor Sampling? Sampling of contaminants in the vapor phase that may collect in the pore spaces of soil immediately beneath the foundation of a building. Sub-slab soil vapor sampling is one step in evaluating the Vapor Intrusion exposure pathway in Human Risk Assessment.

27. 27 Why Sub-Slab Soil Vapor Samples? Sub-slab samples collected to confirm or deny the presence of elevated PCE in soil vapor beneath the building; Concentrations of VOCs beneath the building better represent concentrations available to migrate into the building.

28. 28 Sub-Slab Soil Vapor Results The primary risk driver, PCE, was detected beneath the building, at a maximum concentration of 60 µg/L. TCE (trichloroethylene) was the only other VOC detected in sub-slab soil vapor samples.

29. 29 Indoor Air Model predicts indoor air concentrations Risks and Hazards are estimated based on breathing indoor airIndoor Air Model predicts indoor air concentrations Risks and Hazards are estimated based on breathing indoor air

30. 30 Preliminary Human Risk Assessment Results Cumulative Cancer Risk = 9E-05 (9 in 100,000) Noncancer Hazard Index = 1 Cancer Risks and Noncancer Hazards are at the target industrial levels (risk = 1 in 10,000 and HI = 1) regulated by the State of Utah Unacceptable risks to human health are not expected based on model results.

31. 31 QUESTIONS? This concludes Parsons portion of the presentation. I thank you for your attention and would be happy to answer any questions if you have them.This concludes Parsons portion of the presentation. I thank you for your attention and would be happy to answer any questions if you have them.