The following items shall be included in the SWM Site Plan:
(a) Appropriate sections from the Municipal Subdivision and Land Development Ordinance, and other applicable local ordinances, shall be followed in preparing the SWM Site Plans. In instances where the City of Williamsport lacks subdivision and land development regulations, the content of SWM Site Plans shall follow the county’s Subdivision and Land Development Ordinance;
(b) The City of Williamsport shall not approve any SWM Site Plan that is deficient in meeting the requirements of this title. At its sole discretion and in accordance with this article, when a SWM Site Plan is found to be deficient, the City of Williamsport may either disapprove the submission and require a resubmission, or in the case of minor deficiencies the City of Williamsport may accept submission of modifications;
(c) Provisions for permanent access or maintenance easements for all physical SWM BMPs, such as ponds and infiltration structures, as necessary to implement the Operation and Maintenance (O&M) Plan discussed in subsection (i)(9) below;
(d) The following signature block for the City of Williamsport:
“ (Municipal official or designee) , on this date (date of signature) has reviewed and hereby certifies that the SWM Site Plan meets all design standards and criteria of the Municipal Ordinance No. (number assigned to the ordinance) .” |
(e) The following signature block for the registered professional engineer licensed in the Commonwealth of Pennsylvania preparing the plan:
“I, , hereby certify on this date (date of signature) that the storm water management plan meets all design standards and criteria of the Ordinance No. (Number assigned to the ordinance) .” |
(f) The following statement by the owner:
“I/we hereby acknowledge that I/we and/or my/our assignees/grantees shall be responsible for maintenance of the storm water management system shown hereon, in accordance with approved storm water management ownership and maintenance plan for this project, and that such storm water system shall remain as a permanent fixture that cannot be altered, replaced, or removed without prior written approval. from the City of Williamsport.” |
(g) A note indicating that as-built plans will be submitted by a qualified professional engineer for all storm water facilities prior to occupancy, or the release of the surety bond. The City of Williamsport reserves the right to authorize the Municipal Engineer to review said as-built plans;
(h) All permits required by the Pennsylvania Department of Environmental Protection (PA DEP), Pennsylvania Department of Transportation (PA DOT) and U.S. Army Corps of Engineers (USACE) and other regulatory agencies; and
(i) The SWM Site Plan shall provide the following information:
(1) The overall storm water management concept for the project;
(2) A determination of site conditions in accordance with the BMP Manual. A detailed site evaluation shall be completed for projects proposed in areas of carbonate geology or karst topography, and other environmentally sensitive areas such as brownfields;
(3) Storm water runoff design computations and documentation as specified in this title, or as otherwise necessary to demonstrate that the maximum practicable measures have been taken to meet the requirements of this Title, including the recommendations and general requirements in § 1393.01;
(4) Expected project time schedule;
(5) A soil erosion and sediment control plan, where applicable, as prepared for and submitted to the approval authority;
(6) The effect of the project (in terms of runoff volumes, water quality and peak flows) on surrounding properties and aquatic features and on any existing storm water conveyance system that may be affected by the project;
(7) Plans and profile drawings of all SWM BMPs including drainage structures, pipes, open channels, and swales;
(8) SWM Site Plan shall show the locations of existing and proposed on-lot wastewater facilities and water supply wells;
(9) The SWM site plan shall include an(O&M) Plan for all existing and proposed physical storm water management facilities. This plan shall address long-term ownership and responsibilities for O&M as well as schedules and costs for O&M activities;
(10) Horizontal and vertical profiles of any existing and proposed watercourses, drainageways, channels or streams, including hydraulic capacity;
(11) Hydrologic and hydraulic computations for all existing and proposed storm water management facilities and measures;
(12) Storm water management both during and after development; and
(13) Unless specifically exempted in writing, the following must also be shown on the SWM Site Plan, prepared in a form which meets the requirements for recording in the Office of the Register and Recorder of Lycoming County, Pennsylvania:
(A) Annotated maps, drawings, engineering plans and construction details. Said plan shall be prepared by a registered professional land surveyor, qualified geologist, landscape architect, architect or engineer licensed in the State of Pennsylvania, with said preparer’s seal and registration number affixed to the plan. Plans for tracts of less than 20 acres shall be drawn at a scale of one inch equals no more than 50 feet; for tracts of 20 acres or more, plans shall be drawn at a scale of 1 inch equals no more than 200 feet. Plans shall be submitted on the following sheet sizes: 18 inches by 24 inches; 24 inches by 36 inches; or 36 inches by 42 inches. All lettering shall be drawn to a size to be legible if the plans are reduced to half size. All sheets comprising a submission shall be on one size;
(B) The name of the proposed development and the name and address of the owner of the property and the individual or firm preparing the plan;
(C) Date of submission and revision, graphic scale and North arrow;
(D) Total tract boundary with distances marked to the nearest foot and bearings to the nearest degree and the total acreage of the tract;
(E) Key map (drawn to scale) showing all existing natural and human-made features beyond the property boundary affected by the project and the extent of the watershed or sub-basin which drains through the project site for 1,000 feet or as specified by the City of Williamsport;
(F) Existing and proposed topographic contours shall be provided at intervals not greater than five feet for existing and proposed conditions. Topographic contours at intervals less than five feet may be required for flat sites, and to depict certain existing and future storm water management features. The reference datum used to develop topographic contours shall be stated on the plans;
(G) Existing and proposed use, including the total area of impervious surfaces after construction;
(H) Location and selected plant material used for vegetative filter paths to sinkholes, stream buffers, buffer yards, wetlands, streams and other waters of the commonwealth, and the location of all notices to be posted, as specified in this title; and
(I) If storm water management facilities are off-site, a note on the plan referring to location and agreements indicating responsibility for conveyance to and maintenance of the facilities; all such off-site facilities shall meet the design standards and criteria specified in this title, and details of the facilities shall be included with the plan.
(Ord. 6211, approved 4-15-2012; Ord. 6481, approved 3-14-2024)