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Storm Water
Ordinance
1 of 2021
​​​​​​​Part 6
  1. Restoration, retrofit or upgrade an existing stormwater management
    feature (inadequate detention pond
    , for example).
  2. Creation of new stormwater management features, especially green
    infrastructure, for a previously unmanaged site
  3. Provide a water-based benefit to the public other than stormwater
    management (for example, extend a public sewer to an area not already
    served).
  4. Treatment of abandoned mine drainage.
  1. The proposal for demonstrated equivalency shall be accompanied by
    documentation or methodology quantifying the equivalency of the proposed project
    to what would have been orig
    inally required. Acceptable documentation or
    methodology may include use of the Worksheets and Checklist found in PA DEP
    NPDES permit app
    lication, Appendix D or approved method showing the proposed
    equivalency
    :
  1. Controls approximately the same amount of runoff volume as what would
    originally have been proposed
  2. Improves approximately the same amount of runoff quality as would have
    been originally proposed
  3. Is located within an impaired watershed or stream segment which will
    benefit from the proposed project
    . Impairment may include stream
    impairment, reduced stream buffer, and pollutant loading. Refer to the
    Westmoreland County Integrated Water Resources Plan at
    www.westmorelandstormwater.org .

4. The demonstrated equivalent stormwater activity shall:

  1. Be constructed concurrently with the project for which it is being applied;
  2. Be constructed according to plans approved by the municipality and the
    WCD including any erosion control and stormwater management practices
    as applicable;
  3. Obtain all necessary permits;
  4. Be located on land owned by or controlled by the applicant or by a
    cooperating public or private entity(s) (school, church, club
    , municipality,
    etc.)
    ;
  5. Be protected by a perpetual easement or deed restriction, or landowner
    agreement;
  6. Be located in the same general watershed as the project for which it is
    being applied; and
  7. Have an Operation and Maintenance Plan (O&M) specifying who is
    responsible for what tasks
    .

§306. Small Project

  1. When a regulated development activity (refer to Table in Section 302 of this 'ordinance)
    creates impervious area between 3,000 and 10,000 square feet
    , or total earth disturbance
    between 5,000 and 20
    ,000 square feet, the stormwater management requirements are as
    follows. Refer also to Appendi
    x C.
  2. For new impervious surfaces, the first 1 inch of runoff shall be permanently removed from the runoff flow, and shall not be released to waters of the Commonwealth. Removal options include reuse, evaporation, transpiration and infiltration.
  1. Facilities, to the greatest extent possible and subject to municipality approval, shall be
    designed to drain the permanently removed runoff volume in a period no greater than 72
    hours
    . Runoff volumes in excess of2 inches shall be safely conveyed to a stable vegetated
    area, natural watercourse, the curb or gutter line of roadway or existing storm
    collection/conveyance/control system as applicable.
  2. This method is exempt from the requirements of Section 402 of this ordinance.
  3. A Small Project Stormwater Management Plan must be submitted to Bolivar Borough
    and the WCD and shall consist of the following items and related support material needed
    to determine compliance with Sections 307 to 311 of this ordinance
    . The applicant can also
    use protocols listed in Appendix C.
  4. Narrative: General description of proposed stormwater management techniques,
    including calculations, assumptions and criteria used in the design of the
    stormwater management facilities and BMPs, and construction specifications of the
    materials to be used for stormwater management facilities and BMPs.
  5. Stormwater Management Plan: Showing locations of all stormwater management
    facilities and BMPs
    , especially green infrastructure, limits of disturbance, including
    the type and amount of proposed impervious area, structures
    , roads, paved areas
    and buildings;
  6. Small Project Stormwater Management Worksheet;
  7. Signed agreement page for operation and maintenance of stormwater facilities and
    BMPs (Refer to Appendix B); and
  8. Erosion and Sediment Control Plan: including all reviews and letters of adequacy
    from the Conservation District
    .

§307. General Standards.

A. Proposed land development must consider avoiding, minimizing, and mitigating impacts
to the site that may increase stormwa
ter runoff from the proposed project. Applied
sequentially, these three lo
w impact development strategies should be an overall guide as a
project is planned and carried out
.

  1. The Westmoreland County Integrated Water Resources Plan provides an online decision
    making tool to assist developers, des
    igners, property owners in addressing all water
    resources during development and redevelopment and should be consulted. Refer to
    www.paiwrp.com and
    www.westmorelandstormwater.org.
  2. The following provisions shall be considered the overriding performance standards against
    which all proposed storm water control measures shall be evaluated and shall apply
    throughout Bolivar Borough.
  1. Any landowner and any person engaged in the alteration or development of land
    which may affect stormwater runoff characteristics shall implement such measures
    as are reasonably necessary to prevent injury to health, safety or other property
    . For
    alteration or development taking place in stages, the cumulative development must
    be used in determining conformance with this ordinance. Such measures shall
    include such actions as are required:


  1. To assure that the maximum rate of stormwater runoff is no greater after
    d
    evelopment than prior to development activities for the 100 year storms.
    Ra
    infall data shall be obtained from NOAA Atlas 14 or other source approved
    by the municipality.
  2. To manage the water quality, rate and volume and direction of resulting
    stormwater runoff in a manner which otherwise adequately protects health
    and property from possible injury.
  3. To notify adjacent property owners or owners of affected properties of any
    alteration or increase of stormwater flows.
  1. Runoff treatment BMPs must be employed where necessary to ensure the water
    quality, rate and volume requirements are met
    .
  2. Volume control BMPs shall be used to maintain existing hydrologic conditions for
    small storm events by prom
    oting groundwater recharge and/or evapotranspiration.
    Runoff volume c
    ontrols shall be implemented using the P A DEP Stormwater BMP
    Manual 2006
    or other approved method such as those listed in the following chart:

Acceptable Computation Methodologies for Stormwater Management Plans:

          METHOD:                           DEVELOPED BY:                 APPLICABILITY:


Win TR-20 (or commercial

USDANRCS



Applicable where use of

computer

package

based





full

hydrologic

computer

on TR-20)








model

IS

desirable

or










necessary.




Win TR-55 (or commercial

USDANRCS



Applicable

for

land

computer

package

based





development plans within

on TR-55 ie. VTIPSUHM





limitations

described

III










TR-55





HEC-I, HEC-HMS



US

Army

Corps

of

Applicable where use of






Engineers