Stormwater pollution prevention plan requirements.
A. A SWPPP is required as part of the compliance with this article. This plan must be prepared by a qualified professional and must indicate whether stormwater will be managed on site or off site and, if on site, the general location and type of practices and shall also include sufficient information (e.g., maps, hydrologic calculations, etc.) to evaluate the environmental characteristics of the project site, the potential impacts of all proposed development of the site, both present and future, on the water resources, and the effectiveness and acceptability of the measures proposed for managing stormwater generated at the project site.
The plan must be signed by a New York State licensed professional engineer (PE), who will verify that the design of all stormwater management practices meet the submittal requirements outlined in the New York State Stormwater Management Design Manual. No building or grading permit or site plan approval shall be issued until a satisfactory stormwater pollution prevention plan, or a waiver thereof, has undergone a review and been approved by the Town of Webster's Public Works Department after determining that the plan or waiver is consistent with the requirements of this article.B. The applicant shall employ a responsible individual, as defined in § 289-14 of this article, who will oversee the implementation of the SWPPP on a daily basis.
The applicant shall also employ the services of a qualified professional in erosion and sediment control who will inspect and document the effectiveness of all erosion and sediment control practices. The documentation will be kept in a site logbook. Inspection reports will be completed every seven days and within 24 hours of any storm event producing 0.5 inch of precipitation or more. A monthly summary of reports will be copied to the site logbook and delivered to Town of Webster's Public Works Department within five days after the month's end.C. All SWPPPs shall provide the following information:(1) All information listed in § 289-9 of Chapter 289, Article I, Stormwater Pollution Prevention and Erosion and Sediment Control;(2) Description of each postconstruction stormwater management practice;(3) Site map/construction drawing(s) showing the specific location(s) and size(s) of each postconstruction stormwater management practice.
The map(s) will also clearly show proposed land use with tabulation of the percentage of surface area to be adapted to various uses. A written description of the site plan and justification of proposed changes in natural conditions may also be required.(4) Hydrologic and hydraulic analysis for all structural components of the stormwater management system for the applicable design storms, including calculations such as a description of the design storm frequency, intensity and duration; time of concentration; soil curve numbers or runoff coefficients; peak runoff rates and total runoff volumes for each watershed area; infiltration rates, where applicable; culvert capacities; flow velocities; data on the increase in rate and volume of runoff for the design storms referenced in the New York State Stormwater Management Design Manual; and documentation of sources for all computation methods and field test results.(5) Comparison of postdevelopment stormwater runoff conditions with predevelopment conditions.(6) Dimensions, material specifications and installation details for each postconstruction stormwater management practice.(7) The design and planning of all stormwater management facilities shall include detailed maintenance and repair procedures including a schedule to ensure their continued function.
These plans will identify the parts or components of a stormwater management facility that need to be maintained and the equipment and skills or training necessary. Provisions for the periodic review and evaluation of the effectiveness of the maintenance program and the need for revisions or additional maintenance procedures shall be included in the plan.(8) The applicant must ensure access to all stormwater treatment practices at the site for the purpose of inspection and repair by securing all the maintenance easements needed on a permanent basis. These easements will be recorded with the plan and will remain in effect even with transfer of title to the property.
See § 289-23 of this article for additional information.(9) The applicant must execute an easement and an inspection and maintenance agreement binding on all subsequent owners of land served by the on-site stormwater management measure(s) in accordance with the specifications of this article. See § 289-23 of this article for additional information.(10) The SWPPP shall be prepared by a qualified professional and the final plan must be signed by a New York State licensed professional engineer, who shall certify that the design of all stormwater management practices meet the requirements in this article.(11) A written or graphic inventory of the natural resources at the site and surrounding area as it exists prior to the commencement of the project and a description of the watershed and its relation to the project site.
This description should include a discussion of soil conditions, forest cover, topography, wetlands, and other native vegetative areas on the site. Particular attention should be paid to environmentally sensitive features that provide particular opportunities or constraints for development.(12) The Town of Webster's Public Works Department may also require a concept plan to consider the maximum development potential of a site under existing zoning, regardless of whether the applicant presently intends to develop the site to its maximum potential.(13) The applicant must present a detailed plan for management of vegetation at the site after construction is finished, including who will be responsible for the maintenance of vegetation at the site and what practices will be employed to ensure that adequate vegetative cover is preserved.
This plan must be prepared by a registered landscape architect or by the soil and water conservation district and in compliance with landscaping specifications outlined in the New York State Stormwater Management Design Manual.(14) The applicant shall assure that all other applicable environmental permits have been acquired for the site prior to approval of the final stormwater design plan.