(A) (1) General requirements. These standards reflect the current requirements of the village. These standards are not intended as a substitute for good engineering judgment. All plans submitted for site plan review shall be prepared and sealed by a registered civil engineer. Elevations must be on U.S. G.S. Datum. Any changes required shall be made on the original drawings and three sets of plans resubmitted for approval. Site improvement plans submitted for review prior to a building permit application must be accompanied by a deposit for engineering review. Detailed cost estimates for improvements must be submitted concurrently with the plans. Plans shall be drawn to a scale of 1" = 50' horizontal if the site is three acres or greater. A scale of 1" = 20' horizontal is required on sites less than three acres. All profile views shall be drawn with a scale of 1" = 5' vertical. All site improvement plan sheets shall be 24-inches by 36-inches.
(2) Additional requirements. In addition to all information required under the village zoning code for site plan submittal, the following items must be shown on the prepared plan:
(a) The legal property description;
(b) The bench marks used these may be obtained from the Village Engineer;
(c) Existing grades on a 50-foot cross-section to a minimum of 50 feet beyond the site property line and sufficient intermediate grades to determine such things as ditches, swales, adjacent pavement, buildings and other important features;
(d) All existing topography;
(e) Off-site topography, adjacent building grades, paved parking areas or drives (indicate direction of drainage), drains, culverts and other pertinent features. Show typical cross-sections of existing drains or swales;
(f) Existing and proposed easements;
(g) Existing utilities (size, depth, location), manholes (rim and inverts), culverts;
(h) Street rights-of-way, existing and proposed;
(i) Proposed topography of the site;
(j) Proposed surface drainage;
(k) Proposed elevations should be underlined or boxed in to differentiate from existing elevations. It is expected that all hard surface elevations, such as foundation tops, pavement and structures, be in hundredths of a foot and all ground elevations be in tenths of a foot;
(l) A quantity list for all public improvements;
(m) A location map;
(n) Details of items proposed and standard notes.
(B) Retention. Storm retention is generally necessary for all developments. Retention may be provided by retention basins, storage in paved areas, or other best management practices. Storage in paved areas is most often economical where the proposed parking area is not small in relation to the proposed building roof area. Runoff from the roofs must be routed so that it can be stored. Restricted catch basin covers must be used to provide storage in the paved areas. Manhole covers with two vent holes often meet discharge requirements. The covers are designed to let the allowable discharge of water into the storm system. Flow calculations must be submitted for the restricted covers specified. The flow should be calculated for the maximum storage head. For retention basin design, see § 154.06.
(C) Drainage. All sites shall have internal storm drainage. Where required, storm sewer systems shall be sized to carry off-site drainage. For all projects, storm calculations are to be submitted, drainage districts must be shown and the hydraulic gradient calculated. A profile view may be required for storm sewers. The first catch basin above the public system or outlet must be sumped and trapped.
(D) Grading.
(1) The site plan should give proposed grades at all high points, grade-breaks and low points. It should show existing and proposed grades around the perimeter of the site and at site corners. The proposed exterior grades at building corners and the proposed finish floor elevation shall be shown to hundredths of a foot.
(2) All building grades shall be established such that there is positive drainage from the building to the designated drainage course. The perimeter grades shall remain the same or be lower than existing grades, unless tributary drainage is provided for by extending the storm sewer and installing catch basins at the property line.
(E) Public water mains.
(1) The project engineer shall arrange a meeting with the Village Engineer and the Chief of the Fire Department to discuss specific fire protection needs. Fire protection line must be sized to provide the following flows:
(a) 3,000 G.P.M. from two hydrants for nonresidential projects;
(b) 2,000 G.P.M. from two hydrants for multi-family and institutional.
(2) Public water mains are required for fire protection purposes. The standard size line is a minimum of 12 feet in diameter. If a looped system is less than 1,500 feet in length, an eight-inch line may be used. Hydrant leads longer than 60 feet must be eight inches in diameter and have an eight-inch gate valve and well installed at the tee. In either case, cast iron pipe is required.
(3) No part of the exterior of the buildings, other than dwellings, shall be further than 250 feet from a hydrant. Distances are to be measured along the shortest feasible exterior route (never measured through buildings) for laying hose. Fire hydrants must be located at least 25 feet from any exterior wall of any masonry building and at least 50 feet from any exterior wall of frame or equivalent construction, including brick and stone veneer. High density and high rise developments shall be provided with sufficient valves and hydrants so located as to provide emergency exterior fire coverage in case of water main breaks.
(4) All public mains must be centered in clear 12-foot wide easements given to the village. Written descriptions of the easements will be prepared by the project engineer and presented to the village for examination before recording. Prior to plan approval, the project engineer shall supply a written, detailed estimate of the cost for the water main. All public water mains require Michigan Department of Health construction permits.
(F) Public sanitary sewers. If more than one building is to be served by a sanitary sewer line, an eight-inch minimum size public sewer must be built. A profile view is required on all sanitary sewers. All public sewers must be centered in clear 12-foot wide easements given to the village. Written descriptions of the easements must be prepared by the project engineer and presented to the village for examination before recording. The Project Engineer shall supply a written, detailed estimate of cost for the sanitary sewer prior to plan approval. All public sanitary sewers require Michigan Department of Health construction permits.
(G) Plans. Village design standards shall be used for design of all public utility construction. One as-built Mylar copy, a minimum of three-mils thick, of all public utility plans shall be provided to the Village Engineer prior to final acceptance of the improvements by the village.
(H) Private agreements for public utilities. If a public utility is required to be built, the following procedures must be followed before a building permit is issued for the site: A contract for construction of municipal improvements must be prepared and fully executed by the owner. The agreement shall be submitted to the Village Engineer for examination. The owner shall deposit with the Village Clerk cash, certified check or irrevocable bank letter of credit in an amount acceptable to the village to ensure the construction of all public improvements. The owner shall submit cash for required fees and deposits. The agreements will be presented to the Village Council for their approval.
(I) Widening lanes. Widening lanes may be required to preserve the safety and capacity of existing roadways. In general, concrete shall be used for the widening lane if the existing pavement is concrete. Full-depth asphalt pavement may be used in other locations with the approval of the Village Engineer.
(J) Right-of-way permits. The following notes must appear on the plans as applicable. Please adjust wording of note to apply to the specific site.
(1) For any work within public rights-of-way, the contractor must secure a permit and arrange for inspection from the Village or County Road Commission or MDOT.
(2) Site improvements shall be inspected and approved prior to issuance of a certificate of occupancy. Call Village Engineer at least 48 hours ahead for an inspection.
(K) Roads. All private roads within a development shall conform with the minimum road standards and specifications of the village. In cases where specific village standards have not been established, Oakland County Road standards shall apply.
(L) Standards for parking lot and drive paving for all residential and office developments. Pavement shall consist of the following minimum design granular soil subbase, base courses and wearing surface courses.
(1) Subbase. Six-inch compacted thickness of MDOT Granular Material Class II shall be placed except where existing soils consist of approved granular material.
(2) Base course options.
(a) Four-inch compacted thickness of bituminous aggregate, MDOT Spec. 4.00, Mixture No. 500.
(b) Six-inch compacted thickness crushed limestone.
(c) Eight-inch compacted thickness of 22A gravel.
(d) Five-inch compacted thickness of bituminous aggregate MDOT Mixture No. 5, with no granular subbase.
(e) Eight-inch crushed limestone with no granular subbase.
(3) Wearing courses.
(a) Three-inch compacted thickness of bituminous aggregate MDOT Mixture No. 1100, 20AA where placed over gravel and limestone base courses.
(b) One and one-half-inch compacted thickness of bituminous aggregate MDOT Mixture No. 1100, 20AA where placed over bitzuminous aggregate base courses.
(4) Concrete pavement alternative. Six-inch thick plain concrete pavement, MDOT Spec. 4.50, Mixture 35P with no granular subbase required.
(5) Minimum parking space size. See the village zoning code for minimum parking space size.
(O.C. § 5.707) (Am. Ord. 268, passed 9-19-22)