COMMUNICATING ENVIRONMENTAL RISKS TO THE PUBLIC Dennis McQuillan - - PowerPoint PPT Presentation

COMMUNICATING ENVIRONMENTAL RISKS TO THE PUBLIC

Dennis McQuillan

Chief Scientist New Mexico Environment Department

June 20, 2018

Contaminants, multiple or single

• nomenclature
• measurement units; dissolved versus total
• valence states
• standards and guidelines
• background

Affected media Exposure pathways and durations Options for corrective action Limited English proficiency

Communication Issues

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Are “contaminants” and “pollutants” synonymous?

Contaminants, Pollutants, Substances

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• N.M. Water Quality Act
• “’water contaminant’ means any substance that could

alter, if discharged or spilled, the physical, chemical, biological or radiological qualities of water”

• “’water pollution’ means introducing or permitting the

introduction into water, either directly or indirectly, of

• ne of more water contaminants in such quantity and
• f such duration as may with reasonable probability

injure human health, animal or plant life or property,

• r to unreasonably interfere with the public welfare or

the use of property”

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Contaminants, Pollutants, Substances

Federal Safe Drinking Water Act

• “The term “contaminant” means any physical, chemical,

biological, or radiological substance or matter in water.”

• Maximum Contaminant Level (MCL), Contaminant

Candidate List, Unregulated Contaminant Monitoring Rule (UCMR)

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Contaminants, Pollutants, Substances

Federal Clean Water Act (Water Pollution Control Act)

• The term "pollutant" means dredged spoil, solid waste, incinerator residue, sewage,

garbage, sewage sludge, munitions, chemical wastes, biological materials, radioactive materials, heat, wrecked or discarded equipment, rock, sand, cellar dirt and industrial, municipal, and agricultural waste discharged into water.

• The term "toxic pollutant" means those pollutants, or combinations of pollutants,

including disease-causing agents, which after discharge and upon exposure, ingestion, inhalation or assimilation into any organism, either directly from the environment or indirectly by ingestion through food chains, will, on the basis of information available to the Administrator, cause death, disease, behavioral abnormalities, cancer, genetic mutations, physiological malfunctions (including malfunctions in reproduction) or physical deformations, in such organisms or their offspring.

• The term "pollution" means the man-made or man-induced alteration of the chemical,

physical, biological, and radiological integrity of water.

• National Pollutant Discharge Elimination System (NPDES)

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Contaminants, Pollutants, Substances

Federal Comprehensive Environmental Response Compensation and Liability Act (CERCLA) “Superfund”

• The term “pollutant or contaminant” shall include, but not be limited to, any

element, substance, compound, or mixture, including disease-causing agents, which after release into the environment and upon exposure, ingestion, inhalation, or assimilation into any organism, either directly from the environment or indirectly by ingestion through food chains, will or may reasonably be anticipated to cause death, disease, behavioral abnormalities, cancer, genetic mutation, physiological malfunctions (including malfunctions in reproduction) or physical deformations, in such organisms or their offspring; except that the term “pollutant or contaminant” shall not include petroleum …

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Contaminants, Pollutants, Substances

• Superfund also defines “hazardous substance”
• Federal Resource Conservation and Recovery Act (RCRA)

defines “solid waste” and “hazardous waste”

• Federal Toxic Substances Control Act (TSCA) defines

“chemical substance”

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Contaminants, Pollutants, Substances

TSCA

• Chemical substance means any organic or inorganic substance of a particular molecular

identity, including any combination of such substances occurring in whole or in part as a result of a chemical reaction or occurring in nature, and any chemical element or uncombined radical, except that “chemical substance” does not include: (1) Any mixture. (2) Any pesticide when manufactured, processed, or distributed in commerce for use as a pesticide. (3) Tobacco or any tobacco product. (4) Any source material, special nuclear material, or byproduct material. (5) Any pistol, firearm, revolver, shells, or cartridges. (6) Any food, food additive, drug, cosmetic, or device, when manufactured, processed,

• r distributed in commerce for use as a food, food additive, drug, cosmetic, or device.
• Mixture means any combination of two or more chemical substances if the combination

does not occur in nature and is not, in whole or in part, the result of a chemical reaction; except “mixture” does include (1) any combination which occurs, in whole or in part, as a result of a chemical reaction if the combination could have been manufactured for commercial purposes without a chemical reaction at the time the chemical substances comprising the combination were combined, and if all of the chemical substances comprising the combination are not new chemical substances …

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Contaminants, Pollutants, Substances

RCRA

• The term “solid waste” means any garbage, refuse,

sludge from a waste treatment plant, water supply treatment plant, or air pollution control facility and other discarded material, including solid, liquid, semisolid, or contained gaseous material resulting from industrial, commercial, mining, and agricultural operations, and from community activities…

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Contaminants, Pollutants, Substances

As = arsenic Chromium = Cr Cr III = trivalent chromium Cr VI = hexavalent chromium Fe = iron Pb = lead Isotopes 1,2-dibromoethane = ethylene dibromide = EDB Nitrogen, nitrate, nitrate-N, nitrite, nitrite-N, ammonia, ionized ammonia, ammonium, total kjeldahl nitrogen

Chemical Nomenclature

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Water

• Milligrams per liter = mg/L = parts per million = ppm
• Micrograms per liter = ug/L = parts per billion =ppb

Vapor

• Milligrams per liter = mg/L, not = ppm
• Microliter per liter = uL/L = parts per million by volume = ppmv

Soil

• Milligrams per kilogram = mg/kg = ppm

Measurement Units

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• Total contaminants: no sample filtration
• Drinking water standards are based on total contaminants
• Dissolved contaminants: sample filtered through 0.45 µm porous

membrane

• Some ground and surface water standards are based on dissolved

contaminants

• Some wells, particularly monitoring wells, produce water with

significant turbidity

• This turbidity can contain suspended metals such as iron, manganese,

aluminum, arsenic that originate from sediment near the well screen, are not mobile in groundwater, and do not originate from contaminant discharges

Dissolved versus Total Water Contaminants

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Animas River Watershed System

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Human Exposure Pathways

• Drinking surface or groundwater
• Swimming/boating
• Sediment exposure
• Ingestion of crops, livestock, fish,

wildlife

• Airborne dust

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Residents have the river in their back yard, drink groundwater from alluvial wells, irrigate fruits and vegetables, and eat fish from the river.

Many Families Live Along the Animas River

Cedar Hill, NM

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Water Quality Standards of Interest in the Animas and San Juan Watersheds

17Standards

and Guidelines for Lead

Media Concentration

Drinking Water 0.015 mg/L (total) Groundwater 0.05 mg/L (dissolved) Surface Water, Aquatic Life, Acute 0.14 mg/L (dissolved) Surface Water, Aquatic Life, Chronic 0.005 mg/L (dissolved) Surface Water, Irrigation 5 mg/L (dissolved) Surface Water, Livestock Watering 0.1 mg/L (dissolved) Soil, Residential 400 mg/Kg Soil, Industrial 800 mg/Kg Soil, Flora 120 mg/Kg Soil, Invertebrates 1,700 mg/Kg Soil, Birds 11 mg/Kg Soil, Mammals 56 mg/Kg Air, Residential 0.15 µg/m3 Food, Corn and Fruiting Vegetables 0.05 mg/Kg Food, Cattle, Pigs and Sheep 0.1 mg/Kg Food, Fish 0.3 mg/Kg Children’s Blood 5 µg/dL

If possible, investigate and address all contaminants even if they do not originate from the site of interest. GKM:

• Primary contaminants of concern are metals released by

acid rock/mine drainage, and mill tailings

• Significant pre-spill background issues
• Contaminants not related to acid rock/mine drainage

include PCBs in fish, nitrate and bacteria in river water and drinking water, biogenic and thermogenic gas in groundwater

Holistic Assessment of Risks

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Legal, regulatory and bureaucratic distinctions are not important to general public. Try to communicate using simple terms that directly address questions and concerns by the public. “Can I drink my well water?” Boiling water kills bacteria, but increases arsenic.

Communicating Risk

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Animas and San Juan Exposure and Risk Dashboard

(Updated May 19, 2017)

https://www.env.nm.gov/wp- content/uploads/2016/01/Ani mas-San-Juan-Risk- Dashboard.pdf

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Animas and San Juan Exposure and Risk Dashboard

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Agricultural Fact Sheet

Additional efforts, and funding, needed to counter unjustified stigma about crops grown in Animas Valley and San Juan County.