Pollutant: Any dredged spoil, solid waste, incinerator residue, filter backwash, sewage, sewage sludge, garbage, munitions, chemical wastes, biological materials, radioactive materials, wrecked or discarded equipment, rock, sand, cellar dirt and industrial, municipal, and agricultural waste discharged into water. Point sources: A point source is the origination of a pollutant in a water body. Pervious: A surface which allow the penetration of water into the ground. The City must maintain compliance with the requirements of the County’s NPDES permit. IN 1997, the first permit was issued to Palm Beach County ’s co-permittees, of which the City of Boca Raton is one. In 1987, the EPA was required under the Clean Water Act (N40CFR Part 112.26) to establish regulations governing stormwater discharge permit application requirements. NPDES (National Pollutant Discharge Elimination System): The National Pollutant Discharge Elimination System (NPDES) is a Federal program designed to eliminate storm water pollutant discharges to receiving waters of the United States. MS4 (Municipal Separate Storm Sewer System): Refers to the City's underground storm sewers, manholes, catch basins M for municipal and four words beginning with S was shortened to become MS4. Displacement of stormwater from the site would increase the fee, whereas retaining the stormwater would decrease the fee. LUF (Land Use Factor): Land use factor is a methodology used in calculating a stormwater utility fee to a parcel of property. Infiltration (Retention) Practices: Retaining stormwater on site, allowing it to infiltrate into the ground or to evaporate are most effective at reducing pollution since the first flush is not discharged to surface waters. Impervious: Any covering which prevents stormwater from entering the ground a building, parking lot, driveway, patio, pool. No debris or waste should be dumped into the MS4 since these materials are quickly carried to nearby waters. Illicit Discharge: The discharge of anything other than stormwater to a municipal separate storm sewer system. Illicit Connection: Illicit connections are defined as illegal and/or improper connections to storm drainage systems and receiving waters. Illegally dumped wastes are primarily nonhazardous materials that are dumped to avoid paying disposal fees or expending the time and effort required for proper disposal. It is often called "open dumping”, "fly dumping", and " midnight dumping" because materials are often dumped in open areas, from vehicles along roadsides, and late at night. Illegal Dumping: Is disposal of waste in a non-permitted area, such as a back area of a yard, a stream bank, or some other off-road area? Illegal dumping can also be the pouring of liquid wastes or disposing of trash down storm drains. The first one inch of runoff carries 90 percent of the pollution. The first runoff, especially off streets and parking lots, washes them clean and carries pollutants with it. It also serves to settle out the sediment, rather than being carried to a water body.įirst Flush: Describes the washing action that stormwater has on accumulated pollutants. They are installed across a swale or stormwater conveyance channel to reduce the velocity and prevent erosion of the swale. For example, a silt fence or stacked hay bales during construction to prevent erosion limiting the removal of vegetation and limiting the time bare land is exposed to rainfall sweeping streets to keep pollutants and litter from being washed into the storm sewer system fertilizer and pesticide application control and structural controls such as physical containment of stormwater in ponds to allow settling, filtration and percolation.ĭitch Blocks, Cross Blocks or Check Dams: These blocks or dams are defined as a small temporary dam constructed of filter fence material, stone or hay bales. The following may help you become more accustomed to frequently encountered phrases found in NPDES stormwater related articles and materials.īMPs (Best Management Practices): In environmental regulation, Best Management Practices are defined as "source control" and "that practice which is used for a given set of conditions to achieve satisfactory water quality and quantity enhancement at a minimum cost." More simply put, BMPs refers to many practices or types of controls. If you were told to improve your BMPs, to be careful of what is discharged to the MS4, or that the highest percentage of pollutants are conveyed with something called the First Flush. Creation of a stormwater management program has resulted in a vocabulary of terms and words which may be unfamiliar.
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