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Page 2 <br />be required to apply for a permit for its gravel pit, but would need [o apply if it owned or operated an airport. <br />(Note: This exemption does not apply to privately owned industries within the same small municipality.) <br />B. Definition of Terms <br />!Municipal separate storm sewer system, or MS4, means a conveyance or system of conveyances <br />(including roads with drainage system, municipal sheets, catch basins, curbs, gutters, ditches, man-made <br />channels, or storm drains): <br />1) owned or operated by a State, city, town, county, district, association, or other public body (created <br />by or pursuant to State law) having jurisdiction over disposal of sewage, industrial wastes, <br />Stormwater, or other wastes, including special districts under State law such as a sewer district, flood <br />control district or drainage district, or similar entity, or a designated and approved management agency <br />under section 208 of the Clean Water Act that discharges to state waters; <br />2) designed or used for collecting or conveying Stormwater, <br />3) which is not a combined sewer; and <br />4) which is not part of a Publicly Owned Treatment Works (POTW) as defined at 40 CFR 122.2 and 5 <br />CCR 1002-2Q, Sec. 4.3.7.X(3-91). <br />Stormwater discharge associated with industrial activity: The Stormwater regulations require that <br />Stormwater dischazges associated with industrial activity be covered under the permit program. This refers [o <br />any point source which is used for collecting and conveying Stormwater and which is located at an industrial <br />plant or directly related to manufacturing, processing or raw materials storage areas at an industrial plant. The <br />term includes, but is not limited to, Stormwater dischazges from: industrial plant yazds; immediate access roads <br />and rail lines; material handling sites; refuse sites; sites used for the application or disposal of process waters; <br />sites used for storage and maintenance of material handling equipment; sites that are or have been used for <br />residual treatment, storage or disposal; shipping and receiving areas; manufacturing buildings; storage areas <br />(including tank farms) for raw materials, and intermediate and finished products; and areas where industrial <br />activity has taken place in the past and significant materials remain and are exposed to Stormwater. (See 40 <br />CFR 122.26 for a more complete definition.) <br />C. Permit Requirements <br />The industrial permit requirements include prohibitions against discharges ofnon-Stormwater. They require <br />dischazgers to control and eliminate the sources of pollutants in Stormwater through the development and <br />implementation of a Stormwater Management Plan (SWMP). The plan must include Best Management <br />Practices (BMPs), which may include treatment of Stormwater discharges along with source reduction. <br />Additional requirements aze semi-annual inspections, Annual Reports, discharge monitoring reports (in some <br />cases), and annual fees. <br />Stormwater Maoagemeot Plao (SWMP) -Development and implementation of a Stormwater Management <br />Plan is one of the main permit requirements. One of the most important features is Best Management <br />Practices, or BMPs. These can encompass a wide range of options, both structural and non-structural. <br />Inclusion of BMPs allows most of the permits to avoid numeric etHuent limits. <br />