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Table 2-10 Pollutants Commonly Found in Stormwater
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<br />Nutrients: Nitrogen, Phosphorus
<br />Decomposing grass clippings,
<br />leaves and other organics, animal
<br />waste, fertilizers, failing septic
<br />systems, atmospheric deposition
<br />Algal growth, reduced clarity, other
<br />problems associated with
<br />eutrophication (oxygen deficit, release
<br />of nutrients and metals from
<br />sediments)
<br />Sediments: Suspended and
<br />Deposited
<br />Construction sites, other disturbed
<br />and/or non -vegetated lands,
<br />eroding streambanks and
<br />shorelines, road sanding
<br />Increased turbidity, reduced clarity,
<br />lower dissolved oxygen, deposition of
<br />sediments, smothering of aquatic
<br />habitat including spawning sites, and
<br />benthic toxicity
<br />Organic Materials
<br />Leaves, grass clippings
<br />Algal growth, reduced clarity, other
<br />problems associated with
<br />eutrophication (oxygen deficit, release
<br />of nutrients and metals from
<br />sediments)
<br />Pathogens: Bacteria, Viruses
<br />Domestic and wild animal waste,
<br />failing septic systems
<br />Human health risks via drinking water
<br />supplies, contaminated swimming
<br />beaches
<br />Hydrocarbons: Oil and Grease,
<br />PAHs (Naphthalenes, Pyrenes)
<br />Tar -based pavement sealant,
<br />industrial processes, automobile
<br />wear, emissions and fluid leaks,
<br />waste oil.
<br />Toxicity of water column and
<br />sediment, bioaccumulation in aquatic
<br />species and throughout food chain
<br />Metals: Lead, Copper, Cadmium,
<br />Zinc, Mercury, Chromium,
<br />Aluminum, others
<br />Industrial processes, normal wear
<br />of auto brake linings and tires,
<br />automobile emissions & fluid
<br />leaks, metal roofs
<br />Toxicity of water column and
<br />sediment, bioaccumulation in aquatic
<br />species and through the food chain,
<br />fish kill
<br />Pesticides: PCBs, Synthetic
<br />Chemicals
<br />Pesticides (herbicides, insecticides,
<br />fungicides, rodenticides, etc.),
<br />industrial processes
<br />Toxicity of water column and
<br />sediment, bioaccumulation in aquatic
<br />species and through the food chain,
<br />fish kill
<br />Chlorides
<br />Road salting and uncovered salt
<br />storage
<br />Toxicity of water column and sediment
<br />Polycyclic Aromatic Hydrocarbons
<br />(PAH's)
<br />Tar based pavement sealant
<br />Carcinogenic to humans
<br />Trash and Debris
<br />Litter washed through storm drain
<br />networks
<br />Degradation of the beauty of surface
<br />waters, threat to wildlife
<br />Based on Minnesota Urban Small Sites BMP Manual (Barr Engineering Co, 2001).
<br />2-44
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