(a) General Plan Requirements. Through maps, illustrations, reports, and calculations, the stormwater management plan shall display the required information in a clear and logical sequence. The stormwater management plan shall be sufficiently detailed to specify the type, location, and size of soil erosion control measures and storm water facilities, including calculations. The storm water management plan shall be drawn to a scale of at least one inch equal to 40 feet for property less than three acres and one inch equal to 100 feet for property three acres or more in size.
(b) Plan Submittal Requirements. The applicant shall provide a stormwater management plan to the Village for review and approval. Upon request by the applicant, or at its own initiative, the Planning Commission may determine that one or more requirements may not be applicable and may be waived. Applicant shall submit 20 copies of the stormwater management plan, which shall identify and contain all of the following information:
(1) Contact Information. The name, address, and telephone number of all persons having a legal interest in the property and the tax reference number and parcel number of the property or properties affected. Include information on the zoning classification of the applicant's parcel and all adjacent parcels.
(2) Location Map. A map depicting the location of the development site and all water bodies that will ultimately receive storm water runoff.
(3) Topographic Base Map. The existing and proposed topography of the development site, including the alignment and boundary of the natural drainage courses, with contours having a maximum interval of not greater than two feet. The map shall also show existing surface water drainage (permanent and intermittent) and flow direction, including streams, ponds, culverts, ditches, and wetlands; location of 100-year floodplain, if applicable to the site; current land use including all existing structures; locations of utilities, roads, and easements; and significant natural and manmade features not otherwise shown.
(4) Watershed. A map showing the drainage boundary of the proposed development and/or earth change, each point of discharge from the development and/or earth change, and the drainage relationship with existing council-approved watershed patterns.
(5) Calculations. Stormwater calculations shall be provided in accordance with the design standards referenced in Section 1478.11.
(6) Site Plan Drawing. A drawing showing all proposed stormwater facilities with existing and final grades. This map shall also show existing and proposed lot lines, property lines, and structures, parking areas, etc. on the parcel and within 100 feet of the site.
(7) Outlet and Culvert Information. The sizes and locations of upstream and downstream culverts serving the major drainage routes flowing into and out of the development site, with arrows indicating the direction of flow to the ultimate receiving water body. Any significant offsite and onsite drainage outlet restrictions other than culverts should be noted on the drainage map. Storm sewer calculations indicating the number of acres, calculated to the nearest tenth of an acre, contributing to each specific inlet/outlet and maximum flow in cubic feet per second shall be stated on the plan. The applicant shall demonstrate that suitable conveyance exists downstream of the development site to receive the stormwater, including easements, if necessary, for such conveyance. If easements do not exist, and cannot be acquired, the applicant shall demonstrate the means of volume controls. Any areas of offsite sheet flow shall be identified.
(8) Construction Plan. An implementation and sequencing plan for construction and inspection of all stormwater facilities, including a schedule of the estimated dates of completing construction of the storm water facilities shown on the plan and an identification of the proposed inspection procedures to ensure that the stormwater facilities are constructed in accordance with the approved stormwater management plan.
(9) Construction Specifications. All construction specifications for the stormwater facilities and a single sheet showing all proposed stormwater facilities, including vegetative BMPs, with drainage easements overlaid onto the overall road and utility plan and drawn to the same scale.
(10) Additional Drawings. Drawings, profiles, and specifications for the construction of the stormwater facilities, including vegetation, reasonably necessary to ensure that stormwater runoff will be drained, stored, or otherwise controlled in accordance with this chapter. All drawings will include the date (month, day, year), including dates of any revisions, a title block, scale, and north point.
(11) Maintenance Plan. A document in form and substance acceptable to the Village for ensuring maintenance of any privately owned stormwater facilities. The maintenance plan shall include a mandatory association or other enforceable commitment to provide routine, emergency, and long-term maintenance of the facilities and, in the event that the facilities are not maintained in accordance with the approved stormwater management plan, the maintenance plan shall authorize the Village to maintain any onsite stormwater facility as reasonably necessary, at the owner’s expense.
(12) Firm Contact Information. Name and signature of planner, architect, engineer, surveyor, wetland specialist, landscape architect, and/or other technical experts who have assisted in the preparation of the stormwater management plan, designed the stormwater facilities, and will inspect the final construction of the stormwater facilities. The submitted plan shall be stamped and signed by the licensed design engineer or registered landscape architect.
(13) Vegetation Plan. A drawing, which details the existing vegetation to remain and protective measures to be undertaken during construction.
(14) Other Environmental Permits. All other applicable environmental permits shall be acquired for the site prior to construction.
(15) Additional Information. Any other information necessary for the Village to verify that the stormwater management plan complies with the Village’s design and performance standards for drains and stormwater facilities.
(16) Fees. Payment of applicable review fees is required before any review will commence.
(17) Phased Development Plans. Should the applicant plan to subdivide or develop a given area but wishes to begin with only a portion of the total area, the original preliminary plan will include the proposed general layout for the entire area. The first phase of the subdivision will be clearly superimposed upon the overall plan in order to illustrate clearly the method of development and/or earth change that the applicant intends to follow. However, the stormwater management plan shall be submitted for the entire development, with calculations and devices designed for buildout sufficient to demonstrate to the Planning Commission the feasibility of future phases complying with the standards of this chapter.
(18) Site Features. The location and description of onsite and adjacent offsite features that may be relevant in determining the overall requirements for stormwater management. These features may include, but are not limited to, the following:
A. Adjoining roads, subdivisions, and other developments and/or earth change activities;
B. Schools, parks, and cemeteries;
C. Drains, sewers, water mains, septic fields and wells;
D. Overhead power lines, underground transmission lines, gas mains, pipelines or other utilities;
E. Existing and proposed easements;
F. Natural and artificial watercourses, wetlands and wetland boundaries, floodplains, lakes, bays and lagoons;
G. Designated natural areas;
H. Any proposed environmental mitigation features.
(19) Soil Borings. Soil borings shall be required at various locations including the sites of proposed retention/detention/infiltration facilities.
(20) Previously Developed Sites. For earth changes, development or redevelopment occurring on a previously developed site, an applicant shall be required to include within the stormwater management plan measures for controlling existing stormwater runoff discharges from the site in accordance with the standards of this chapter, or to match existing discharge rates, whichever is less.
(Ord. 154. Passed 10-12-11.)