(A) Preliminary plans are required:
(1) Following the City Engineer’s approval of a conceptual plan, in conjunction with a preliminary plat stage of the major plat procedure.
(2) In conjunction with minor plats or replats, depending on the size of the lots and anticipated planned development, preliminary plans are at the discretion of the City Engineer. The preliminary plans are to be submitted to the City Engineer after the conceptual plan has been approved.
(3) In conjunction with a planned development district.
(B) Scale, size and submittals.
(1) The preliminary plans shall be at a scale of 50, 60, 100 or 200 feet to 1 inch.
(2) The plans shall be drawn on an 11" x 17" sheet.
(3) The developer shall submit all required copies to the City Engineer. All copies shall be signed and be sealed by a registered professional engineer in the State of South Dakota.
(C) Information required.
(1) Preliminary plans shall consist of the following plan sheets:
(a) General layout plan. The general layout plan shall show the proposed road alignments along with the sidewalks curb and gutter, proposed lots and any existing features that will remain in place after development is completed.
(b) Grading plan. The grading plan shall show the existing contours with intervals acceptable to the City Engineer’s office. Any proposed cut and fill operations must also be shown if they will substantially alter existing land elevations.
(c) Utility plan. The utility plan shall show all sanitary sewer locations, size, flow direction, approximate manhole locations and invert elevations, lift stations and connection to the existing system. The water main layout shall show the pipe location and size, hydrant and valve location and connection to the existing system. The street lighting layout shall show the street light pole locations and street light wattage.
(d) Drainage plan. A preliminary storm drainage study as required by the storm drainage design and technical criteria manual, or by the City Engineer, shall be submitted for preliminary approval. The drainage plan shall also indicate which downstream drainageways or detention basins will be affected by the full development of the subdivision.
(e) Groundwater control plan. Groundwater elevations shall be required wherever it is deemed necessary by the City Engineer to establish a finished grade for the proper development of the subdivision. When elevations are required, the method of groundwater collection shall be indicated for all lots prior to development. Dewatering for the purposes of establishing a lower finished grade is prohibited. Buildings with crawl spaces or slab-on-grade construction are exempt from groundwater collection requirements.
(D) Approval process. The preliminary plans shall be reviewed and approved by the City Engineer before the proposed development continues to the final plan stage.
(Ord. 1251, passed 4-18-2011; Am. Ord. 1369, passed 5-21-2018)