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CITY OF EVERETT STORMWATER MANAGEMENT MANUAL
<br /> regulations(Chapter 173-340 WAC). Water removed from the vaults can be discharged in
<br /> accordance with the federal 40 CFR 761.79, and state regulations(Chapter 173-201A WAC and
<br /> Chapter 173-200 WAC), or via the sanitary sewer if the requirements, including applicable
<br /> permits,for such a discharge are met. (See also Appendix A).
<br /> 3. Within utility corridors,consider preparing maintenance procedures and an implementation
<br /> schedule that provides for vegetative, gravel, or equivalent cover that minimizes bare or thinly
<br /> vegetated ground surfaces within the corridor to prevent the erosion of soil.
<br /> 4. Apply the appropriate BMPs from A4 Storage Activities, for the storage of waste materials that
<br /> can contaminate stormwater.
<br /> Suggested BMPs
<br /> 1. When selecting utility poles for a specific location, consideration should be given to the potential
<br /> environmental effects of the pole or poles during storage, handling, and end-use, as well as its
<br /> cost,safety, efficacy, and expected life. If a wood product treated with chemical preservatives is
<br /> used, it should be made in accordance with generally accepted industry standards such as the
<br /> American Wood Preservers Association Standards. If the pole or poles will be placed in or near
<br /> an environmentally sensitive area, such as a wetland or a drinking water well, alternative
<br /> materials or technologies should be considered. These include poles constructed with material(s)
<br /> other than wood, such as fiberglass composites, metal,or concrete. Other technologies and
<br /> materials,such as sleeves or caissons for wood poles,may also be considered when they are
<br /> determined to be practicable and available.
<br /> 2. As soon as practicable, remove all litter from wire cutting/replacing operations, etc.
<br /> A7.12 Maintenance of Stormwater Drainage and Treatment Facilities
<br /> Description of Pollutant Sources: Facilities include conveyance systems, detention facilities such as
<br /> ponds and vaults, oil and water separators, biofilters, settling basins, infiltration systems, and all other
<br /> types of stormwater treatment systems presented in Volume III. Catch basins can remove from 5 to
<br /> 15 percent of the pollutants present in stormwater. When catch basins are about 60 percent full of
<br /> sediment,they cease removing sediments. Oil and grease, hydrocarbons, debris,heavy metals, sediments,
<br /> and contaminated water are found in catch basins, oil and water separators, settling basins, etc.
<br /> Pollutant Control Approach: Provide maintenance and cleaning of debris, sediments, and oil from
<br /> stormwater collection,conveyance, and treatment systems to obtain proper operation.
<br /> Required BMPs
<br /> r Maintain stormwater treatment facilities according to the O&M procedures presented in Appendix F, in
<br /> addition to the following BMPs:
<br /> 1. Inspect and clean treatment BMPs, conveyance systems, and catch basins as needed,and
<br /> determine whether improvements in O&M are needed.
<br /> 2. Promptly repair any deterioration threatening the structural integrity of the facilities. These
<br /> include replacement of clean-out gates, catch basin lids, and rock in emergency spillways.
<br /> 3. Ensure that storm sewer capacities are not exceeded and that heavy sediment discharges to the
<br /> sanitary sewer system are prevented.
<br /> 4. Regularly remove debris and sludge from BMPs used for peak-rate control,treatment, etc. and
<br /> truck to a local or state government approved disposal site.
<br /> 5. Clean catch basins in accordance with the information provided in Appendix F. Additional
<br /> information is also included in Chapter 4 of this volume,BMP S.9 Cleaning Catch Basins.
<br /> Volume IV—Source Control
<br /> 3-53
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