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§ 160.22 PERFORMANCE STANDARDS.
   (A)   Stormwater channel location. Generally acceptable locations of stormwater channels in the design of a subdivision may include but are not limited to the following:
      (1)   Adjacent to roadways.
      (2)   In a depressed median of a divided roadway, provided the median is wide enough to permit slopes of one foot drop in six feet horizontal or flatter.
      (3)   Centered on lot lines or entirely within the rear yards of a single row of lots or parcels.
   (B)   In each of the foregoing cases drainage easement with sufficient width to facilitate maintenance and design flow shall be provided and shown on the plat.
   (C)   Storm sewer outfall. The storm sewer outfall shall be designed to provide adequate protection against downstream erosion and scouring.
   (D)   Lot lines. Whenever the plans call for the passage and/or storage of stormwater runoff along lot lines, the grading of all such lots shall be prescribed and established for the passage and/or storage of waters, and no structure or vegetation which would obstruct the flow of stormwater shall be allowed nor shall any change be made to the prescribed grades and contours of the specified stormwater channels.
   (E)   Manholes. All utility sewer manholes constructed in an area designed for the storage or passage of stormwater, shall be provided with either a watertight manhole cover or be constructed with a rim elevation of a minimum of one foot above the high water elevation of the design storm.
   (F)   Easements. Permanent easements for the detention and conveyance of stormwater, including easements of access to structures and facilities, shall be dedicated to the city.
   (G)   Obstruction of drainage. The keeping or disposal of grass clippings, trash, debris, obstruction or unwanted materials into the storm sewers or within or along stormwater channels or in adjacent floodplain areas which may wash into sewers and channels is prohibited.
   (H)   Maintenance. Required maintenance for detention basins or other structures shall be permanently provided by the developer with responsibility becoming that of the private landowner after complete development, subject to inspection of the Stormwater Manager. Every entity shall be specified. Refer to § 160.31 for maintenance requirements.
   (I)   Encroachment permit (city right-of-way).
      (1)   All new construction projects (residential, commercial or industrial) which require a permanent or temporary entrance onto an existing city street or a newly developed street which is to be dedicated to the city at a later time and which can impact proper street drainage shall apply for an encroachment permit at the Office of Public Works. The encroachment permit form will be supplied by the city. The encroachment permit should be complete in sufficient detail to show the location of said entrance with respect to property lines. The encroachment permit shall detail the pipe size, material and slope/grade.
      (2)   This encroachment permit shall be obtained prior to issuance of a building permit by the Planning and Zoning Office.
      (3)   The fee required for the encroachment permit shall be as listed in § 97.17 Application Fee; Bond. This encroachment permit fee is fully refundable provided the entrance is constructed as detailed and approved on said encroachment permit.
(Ord. 2809, passed 12-10-2012) Penalty, see § 160.99
§ 160.23 POST-CONSTRUCTION STORMWATER MANAGEMENT PLAN.
   (A)   Purpose.
      (1)   Land development projects and associated increases in impervious cover alter the hydrologic response of local watersheds and increase stormwater runoff rates and volumes, flooding, stream channel erosion and sediment transport and deposition; this stormwater runoff contributes to increased quantities of water-borne pollutants and; stormwater runoff, soil erosion and nonpoint source pollution can be controlled and minimized through the regulation of stormwater runoff from development sites.
      (2)   The purpose of this chapter is to establish minimum post stormwater management requirements and controls to protect and safeguard the general health, safety and welfare of the public residing in watersheds within this jurisdiction. The goal is to maintain or improve the quality of all streams within the MS4 boundaries to meet their designated use. This chapter seeks to meet that purpose through the following objectives:
         (a)   Minimize increases in stormwater runoff from any development in order to reduce flooding, siltation and stream bank erosion and maintain the integrity of stream channels;
         (b)   Minimize increases in nonpoint source pollution cause by stormwater runoff from development which would otherwise degrade local water quality;
         (c)   Minimize the total annual volume of surface water runoff which flows from any specific site during and following development to not exceed the pre-development hydrologic regime to the maximum extent practicable.
         (d)   Reduces stormwater runoff rates and volumes, soil erosion and nonpoint source pollution where possible, through stormwater management controls and to ensure that these management controls are property maintained and pose no threat to public safety.
   (B)   The Post-Construction Stormwater Management Plan shall be submitted for all subdivisions that discharge to MS4 high quality waters. This includes residential, commercial, and industrial developments. The PC-SWMP is required for all sites one acre and larger in size, and all sites part of a greater common development.
   (C)   The city reserves the right to develop or adopt other guidance documents to serve as design and implementation standards. Other guidance documents distributed by the city should be reviewed and considered when preparing the Post Construction SWMP. These documents may be applied as standards by which designs are to be prepared and controls implemented.
   (D)   The city shall have the authority to implement this chapter by appropriate regulations, guidance or other related materials. In this regard, technical administrative or procedural matters may be modified as needed to meet the objective herein.
(Ord. 2809, passed 12-10-2012)
§ 160.24 POST-CONSTRUCTION PERFORMANCE STANDARDS.
   (A)   The city reserves the right to develop or adopt guidance documents to serve as design and implementation standards. Other guidance documents distributed by the city should be reviewed and considered when preparing the Post-Construction SWMP. Technical, administrative or procedural matters may be modified as needed to meet the objectives defined in this chapter as long as they are not contrary or beyond the intent of the objectives listed above. Such documents given authority by this chapter include Best Management Practice (BMP) manuals, design regulations and requirements, checklists that address submittals, plan review and inspections certification, stormwater manuals, and operation and maintenance manuals. Said documents may be updated periodically to reflect the most current and effective design and construction practices and be made available to the public. Failure to update the manual does not relieve the applicant from complying with this chapter.
   (B)   Post-construction stormwater BMPs shall be designed in accordance with the most current manual or requirements to achieve the following performance standards:
      (1)   The development shall be designed with management measures that are built and maintained to treat, filter, flocculate, infiltrate, screen, evapo-transpire, harvest and reuse stormwater runoff, or otherwise manage the stormwater quality produced from the 80th percentile rain event (0.6 inches of rainfall).
      (2)   BMP’s shall be designed to remove pollutants and reduce runoff volume. The designated use and any existing in-stream use of the stream being discharged to shall be protected. Some land uses produce higher concentrations of certain pollutants such as hydrocarbons or heavy metals, than those normally found in urban areas. These areas will be reviewed for effective removal of the particular pollutant which they discharge. Effective removal will be that which existed prior to development. Examples of land uses that produce higher levels of pollutants are:
         (a)   Gas/fueling stations.
         (b)   Restaurant dumpster areas.
         (c)   Vehicle repair facilities.
         (d)   Vehicle washing/steam cleaning facilities.
         (e)   Auto recycling facilities.
         (f)   Outdoor material storage areas.
         (g)   Loading and transfer areas.
         (h)   Landfills.
         (i)   Industrial sites.
      (3)   BMPs shall reduce or buffer increases in stormwater runoff temperature caused by contact with impervious surfaces as well as minimize increases in stormwater runoff volume and flow rate caused by increases in impervious surfaces.
      (4)   The PC-SWMP shall include provisions for buffers. A buffer shall be defined as:
         (a)   Area contained within a boundary established by the FEMA floodplain boundary or city master planning; or
         (b)   Where a floodplain is not defined or calculated, the buffer will be 25 feet on each side from the top of waterway bank as defined by geomorphic shape (not by current water surface elevation).
            1.   Buffers shall be provided to all blue-line streams as shown on the USGS map.
            2.   Buffer areas and floodplain may be used for stormwater quality devices provided erosion prevention, sediment control, cut-fill practices area addressed appropriately as determined by the city to meet this chapter.
            3.   Exemptions can be granted to buffers so long as erosion and sediment control, water quality are addressed. Exemptions for building in the buffer area shall be granted for:
               a.   Roads and utilities crossing waterways.
               b.   Pedestrian trails and walkways adjacent to waterways.
               c.   Other exemptions may be made at the discretion of the city representative.
      (5)   Redevelopment not previously addressing water quantity or quality control shall reduce the discharge from their site according to the formula below:
         Q(redeveloped) = Q(existing) + q(undeveloped)
                     2
         Q(redeveloped) = maximum discharge rate for the re-development
         Q(existing) = current discharge rate of the developed parcel
         Q(undeveloped) = discharge rate of the parcel prior to any development
         The reduction of allowable flow rate for redeveloped areas shall not exceed more than 30% of the existing developed flow rate. These flow rates are based on redevelopment sites that disturb one acre or more.
      (6)   The City of Glasgow reserves the right to require superseding or additional treatment criteria or objectives for specific pollutants(s) as necessary to meet overall stormwater quality management program objectives or directives under a watershed improvement or Total Maximum Daily Load (TMDL) program as administered by the USEPA or Commonwealth of Kentucky.
      (7)   The Stormwater Manager, in accordance with good engineering practice, may exercise the following options:
         (a)   Off-site mitigation option: Entails infiltration/evapotranspiration/reuse measures that may be implemented at another location within the same watershed as the original project, approved by the city. The city shall identify priority areas within the watershed in which mitigation projects can be completed.
         (b)   Payment-in-lieu option: Allows the owner of a project that falls within the quality criteria, to make a payment to the city in lieu of implementing post-construction BMPs. The city will apply the in-lieu funds to a public stormwater project. The fee shall be used for acquisition, design, construction or maintenance of one or more such facilities in the same watershed in which the development is located.
      (8)   Permanent easement for all stormwater drainage ways, quality and quantity facilities shall be dedicated to the City of Glasgow. There shall also be dedicated easement for access to all stormwater management facilities.
(Ord. 2809, passed 12-10-2012)
BONDS, MAINTENANCE, ASSURANCES AND FEES
§ 160.30 PERFORMANCE BONDS AND OTHER ASSURANCE FOR COMPLETION AND OPERATION OF STORMWATER MANAGEMENT IMPROVEMENTS.
   Upon approval of the stormwater management plan and post-construction stormwater management plan, but before the issuance of a building permit or subdivision plat approval, the Stormwater Manager shall require the applicant either complete all required improvements or the applicant shall post aperformance bond, cash escrow, certified check, letter of credit or other acceptable for of performance security in an amount sufficient ensure the execution of the plan. After determination by the Stormwater Manager that all facilities are constructed in compliance with the approved plan, the performance bond or securities shall be released.
(Ord. 2809, passed 12-10-2012)
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