Lecture 2, Conceptual Site Models - Methodologies to Depict and Evaluate Important Exposure Modes, from Source - to Media - to Receptor
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1 Lecture 2, Conceptual Site Models - Methodologies to Depict and Evaluate Important Exposure Modes, from Source - to Media - to Receptor Conrad (Dan) Volz, DrPH, MPH Assistant Professor, Environmental & Occupational Health, University of Pittsburgh, Graduate School of Public Health Director-Center for Healthy Environments & Communities Director, Environmental Health Risk Assessment Certificate Program
2 What is a Conceptual Site Model? A written and/or pictorial representation of an environmental system and the biological, physical and chemical processes that determine the transport and fate of contaminants through environmental media to environmental receptors and their most likely exposure modes.
3 Definition of Environmental Media - Air Surface Water Groundwater Sediment Soil Subsurface area-vadose Zone Food Chain
4 Components of a Complete Conceptual Site Model Sources of contaminants (can be multiple sources as well as species on a site). Pathways of environmental transport. Indications of any barriers or remedies that exist or are proposed. Pathways to ecological and human receptors. (Refer to ASTM Handout page 8).
5 Why develop a Conceptual Site Model? Pull together technical data concerning a site from numerous sources. Support the selection of sampling locations to establish background concentrations of identified contaminants. Identify data needs and gaps. Describe and integrate the processes that determine contaminant release, migration and receptor exposure.
6 Why develop a Conceptual Site Model (continued)? Determine exposure routes (inhalation, ingestion and/or dermal absorption). Identify uncertainties in the model that need further study. Preliminarily evaluate the risk to human and ecological receptors (CERCLA NPL status is based on a significant risk to human health or the environment).
7 Why develop a Conceptual Site Model (continued)? Facilitate the selection of remedial alternatives and evaluate the effectiveness of remedial actions to reduce exposure. For use a a communication tool in the decisionmaking process involving experts from exposure assessment, human and ecological health, remediation engineers etc. As a risk communication tool for the public.
8 Activities Associated with the Development of Conceptual Site Models (ASTM E )-in order! Identification of potential contaminants. Identification and characterization of the source(s) of contaminants. Delineation of potential migration pathways through environmental media. Establishment of background areas of contaminants for each contaminated media (natural, other anthropogenic source, source dependant).
9 Activities Associated with the Development of Conceptual Site Models (ASTM E )-in order! Identification and characterization of potential environmental receptors. Determination of the limits of the study area or system boundary.
10 Examples of Conceptual Site Simplistic Models Models Radionuclide Liquid Release Model Regional Expansion Conceptual Site Model Legacy Iron and Steel Industry Pittsburgh. Expanded CSM s Amchitka Island the Pacific Ocean and Bering Sea (Russia and the US and Commercial Fisheries)
11 Uptake Mechanisms from Failure of Engineering Controls at Nuclear Facilities Postremediation failure Activity Uptake Pathway Dietary Inhalation/ Non-Dietary/ Dermal Inhalation/Dermal Vvas and Powers, 2005
12 CSM of Release of Liquid Radionuclides Can Build This for Contaminated Sites and Industrial/Power or Defense Plants Using Radionuclides Internal Dose Pharmakokinetics Elimination Rate Toxicity and Damage Aquatic Receptors Time Shielding and Distance
13 The New Pittsburgh Region?
14 Fishing on the Mon
15 Homestead Works
16 Legacy Contamination Mechanisms Air Emissions to Soil and Water -associated transport to subsoil, groundwater and river sediments. Leaking Pipes, Pits, Sumps to Soil and Water- associated transport to subsoil, groundwater and river sediments. Effluent Release to Streams and Riversassociated transport to groundwater and river sediments. Waste depot transport to soil-subsoilgroundwater and surface water-sediments.
17 Environmental Protection Agency (EPA) indicated in 1995 that the ISI was the largest industrial source of toxic environmental contamination in the United States. (EPA 1995) This figure did not include industrial codes for foundries or machine tooling plants, which have historically been associated with the ISI in the Tri-State Area (TSA) and have waste streams associated with metals, organic solvents, cutting oils and isocyanates.
18 Are the Exposures Gone? Who might be exposed?
19 Deposition Conceptual Site Model to Understand Human and Ecological Risk from Legacy Iron and Steel Wastes in the Three Rivers Area of Pittsburgh Conrad D. Volz, DrPH, MPH Introduction Evidence shows that legacy wastes from the Iron and Steel Industry (ISI) continue to contaminate human and ecological habitat in the Three Rivers Area (TRA) of Pittsburgh through: transport from contaminated surface soils, subsurface media, groundwater transport; and residual toxins deposited in river sediment. Conceptual Site Models (CSMs), used by the EPA and DOE graphically depict sources, release, transport pathways, exposure routes and human and ecological receptors and possible blocks to each receptor to reduce risk. CSMs are a powerful tool to help public and environmental health officials understand and communicate regarding risk. Legacy Iron and Steel Industry (ISI) Wastes Cokemaking Polynuclear Aromatic Hydrocarbons Naphthalene, creosote, and tar Oils and grease Benzene and other aromatic hydrocarbons Cyanides and thiocyanides Phenolics Ammonia Liquor Sinter Plants Oil and Grease Phenolics Metals including lead and zinc Aliphatic Hydrocarbons Ammonia and Related Compounds Ironmaking Suspended solids Ammonia Cyanide Phenols Heavy metals including copper lead, zinc, and arsenic Slag Steelmaking Metal dusts including lead zinc and arsenic Fluorides Forming, Cleaning, De-scaling Oil and Grease Wastewater Sludge contains manganese, nickel, cobalt copper, cadmium, chromium, and lead Wastewater containing zinc, lead, cadmium, and/or chromium Grindings containing chromium and zinc dross Spent pickle liquors including hydrochloric, sulfuric, nitric and hydroflouride acid Hot Coating Metals including zinc, lead, aluminum, cadmium, and chromium Electroplating Zinc, tin, and chromium Oil and grease CSM of the movement of legacy waste in the TRA through environmental media and uptake mechanisms by human and ecological receptors is presented. ENVIRONMENTAL MEDIA TRANSFER AIR Resuspension SOIL and VADOSE ZONE Run off SURFACE WATER Sedimentation Resusupension SEDIMENT Recharge River bank or Sediment Breakthrough Deposition Deposition Outflow GROUND WATER Leeching Direct Contact Ingestion Food Chain Leeching Direct Contact Ingestion Food Chain Aquatic Ecological Receptors N/A Gills, Dermal, Ingestion Gills, Dermal, Ingestion RECEPTOR EXPOSURE ROUTES Terrestrial Ecological Receptors Inhalation, Dermal, Ingestion Dermal, Ingestion Dermal, Ingestion Public and Fisherman Inhalation, Dermal, Ingestion Dermal, Ingestion Dermal, Ingestion Consumers of River- Caught Fish N/A Dermal Ingestion Dermal, Ingestion CSM of bio-accumulation and bio-concentration of contaminants in water and sediment by lower trophic levels in the Three Rivers. These contaminants are bio-magnified as they move up the food chain through processes such as the concentration of organic pollutants in lipids and the binding of heavy metals to proteins. The resulting concentration of contaminants in piscivorous fish poses a health risk to human consumers of TRA caught fish (especially subsistence style fisherman) and fish eating birds. ISI wastes can move through the food chain to higher trophic levels via the processes of bioaccumulation, bioconcentration, and biomagnifcation. Concentrations of contaminants in predatory fish can be 100 fold greater than in primary producers posing a possible risk to consumers of river fish and fish eating birds. PISCIVOROUS BIRDS (Great blue heron, Osprey, Kingfisher PISCIVOROUS FISH (Fish-eating fish: walleye white bass, fresh water drum, largeand small-mouth bass) ALGAE CONTAMINANTS IN RIVER SEDIMENT AND WATER More information RIVER FISH CONSUMERS MINNOWS BENTHIC INVERTEBRATE S ZOOPLANKTO N PHYTOPLANKTON Conrad D. Volz, DrPH, cdv5@pitt.edu University of Pittsburgh Graduate School of Public Health BENTHIC FISH (channel catfish common carp) BACTERIA Department of Environmental and Occupational Health
20 Resuspension Emissions Active and Waste Coke Oven Plant Runoff Precipitation Air Deposition Runoff Resuspension Soil and Vadose Zone Surface Water Sedimentation Resuspension Sediment Recharge or Infiltration Groundwater Deposition Outflow Dispersion Leaching Direct Contact Food Web Ingestion Food Web Direct Contact Ingestion Direct Contact Public Worker Biota xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx xxx
21 What is Missing?
22 Pantex Department of Energy Facility and Regional Geographical Factors Beyond the Fence, the Incorporation of These Factors into the CSM Contaminants include U and Trichloroethene---TCE degrades into vinyl chloride, which causes angiosarcoma of the liver. Vyas, Volz and Powers, 2005
23 Water Usage Projections and Conceptual Effects on the Transport of Radionuclides to New Populations Vyas, Volz and Powers 2005
24 CRESP Amchitka Expedition: Use of Conceptual Site Models to Generate Informed Hypothesis for Exposure Assessment
25 Underground Nuclear Tests on Amchitka Island 1965 Long Shot 80 Kilotons 1969 Milrow 1 Megaton 1971 Cannikin 5-8 Megatons Largest USA underground test Nuclear Tests on Amchitka Account for 16% of all United States Nuclear Test Explosion Energy.
26 Amchitka Island Transport of Radionuclides to Marine Areas Ocean surface Cannikin Lake Ocean surface Collapsed chimney Possible chimney transport Intertidal/subtidal Benthic Deep water benthic Test shot Freshwater lens Saltwater layer Leakage transport
27 Conceptual Site Model of Radionuclide Transport from the Amchitka Nuclear Test Shot into Groundwater Burger et al.
28 CSM of Radionuclide Movement Through Subsurface Water Into the Marine Environment and Likely Receptors and Exposure Mechanisms Burger et al., 2005
29 Regional CSM of Radionuclide Fate and Transport In the North Pacific/ Bering Sea Ecosystem CRESP.org Burger et al.
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