Environmental Medium/Source
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Type of Information to Collect
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| Groundwater |
- Locations and descriptions of any known or suspected sources of groundwater contamination.
- Location, depth, and use of known and potentially contaminated wells.
- All contaminants sampled and analyzed for, detection limits, and QA/QC information.
- Contaminants and concentrations detected in site monitoring wells, in water supply wells, and at tap water sources, if available.
- Vertical and lateral extent of the contaminant plume (if known) and of any free product (if present and known).
- Location of liners or slurry walls (e.g., for landfills), if any.
- Background conditions.
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| Surface water/sediment |
- All contaminants sampled and analyzed for, detection limits, and QA/QC information.
- Contaminants and concentrations identified.
- Surface water: Surface water sample results at the site and from upstream and downstream of the site.
- Locations of point sources with a National Pollutant Discharge Elimination System (NPDES) permit.
- Locations of any dikes present.
- Sediment: Sampling results of upstream and downstream channel, impoundment, drainage ditches, streams, and/or dredged sediments (if present).
- Background conditions.
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| Soil |
- All contaminants sampled and analyzed for, detection limits, and QA/QC information.
- Contaminants and concentrations identified.
- Contaminant concentrations before and after any removal or remedial actions.
- Separate sample results for surface and subsurface soils. (Soil less than 3 inches deep is considered surface soil. Samples from other depths [e.g., 0 to 6 inches] are usable, but the depth must be noted. ATSDR prefers 0 to 3 inches deep, but soil samples from 0 to 12 inches may be useable if documentation proves the soil is well-mixed and contaminant concentrations are consistent from the surface down to 12 inches.)
- Depth of samples.
- Sample type(s) (e.g., grab vs. composite).
- Background conditions.
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| Air contaminants from above-ground sources (ambient, stack, indoor air, and dust) |
- All contaminants sampled and analyzed for, detection limits, and QA/QC information.
- Contaminants and concentrations identified from sampling results of air releases on site (production processes, stack emissions, monitoring stations, and soil gas, including buried utility lines) and off-site monitoring (including indoor air, if any).
- Results of air modeling (if performed) of on-site air releases to potential off-site air exposure points and deposition areas, and of on-site stack and/or fugitive emissions.
- Measurements of any flammable and explosive gases.
- Gas pressure measurements.
- Stack testing or trial burn results (if any).
- Air permits held.
- Background, local, and (if possible) site-specific meteorological conditions.
- Descriptions of other potential contaminants found indoors ( e.g. stored chemicals or solvents, cleaners, lead paint, tobacco smoke).
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| Air contaminants from soil vapor intrusion (indoor air, soil gas, groundwater, free product, wet basement) |
- Descriptions of odors indoors, especially following heavy rain.
- Note sheen on water in sump or flooded basement.
- Source distance to occupied buildings and building types.
- Seasonal results of paired indoor air and sub-slab gas/crawlspace air samples.
- All contaminants sampled and analyzed for, detection limits, and QA/QC information.
- Results of groundwater and near-source soil gas sampling.
- Vertical and horizontal profiles of exterior soil gas sampling results.
- Geology layers and preferential pathways.
- Weather and on/off status of vapor mitigation systems during sampling.
- Operation, maintenance, and monitoring plans for vapor mitigation systems.
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| Food chain (biota) |
- All contaminants sampled and analyzed for, detection limits, and QA/QC information.
- Contaminants and concentrations identified from sampling results for edible portions of plants and animals on-site and off-site.
- Information from local fish advisories such as prohibition of eating certain fish because of known contaminant concentrations.
- Information on whether the biota use is for recreational or subsistence purposes.
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| Physical hazards |
- Information about the existence or lack of barriers to the site, such as fences, gates, or warning signs.
- Descriptions of any existing confined spaces, industrial equipment, electric hazards, open pits, sinkholes, stored materials, unexploded ordnance or other explosive hazards, and wires/ropes/chains.
- Known or suspected presence of methane or other flammable gases at the site.
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| Radiologic parameters |
- Radionuclides analyzed for, detection limits, and QA/QC information.
- Radionuclides identified and their concentrations (from field and laboratory measurements)
- Smear (removable surface radiation), air, soil, water, gamma radiation data, and radon sampling (if any).
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