450.030 Submission of Tentative Subdivision Plan.
A subdivider shall prepare a tentative plan together with such improvement plans and other supplementary material as may be required to indicate the general program and objectives of the project, and shall submit fifteen copies of the tentative plan to the City Recorder's office at least 45 days prior to the Planning Commission meeting at which consideration of the plan is desired. Final determination as to the needed information and materials to be submitted shall rest with the Planning Commission.
A. Scale: The tentative plan of a subdivision shall be drawn on a sheet 18 by 24 inches in size or a multiple thereof at a scale of such size as required by the County surveyor.
B. General Information: The following general information shall be shown on the tentative plan of a subdivision:
(1) Proposed name of the subdivision: This name shall not duplicate nor resemble the name of another subdivision in the county and shall be approved by the Planning Commission and the Multnomah County Assessor's Office.
(2) Date, north point and scale of drawing.
(3) Appropriate identification of the drawing as a tentative plan.
(4) Location of the subdivision sufficient to define its location and boundaries and a legal description of the tract boundaries.
(5) Names and addresses of the owner, subdivider and engineer or surveyor.
C. Existing Conditions: The following existing conditions shall be shown on the tentative plan:
(1) The location, widths and names of both opened and unopened streets within or adjacent to the tract, together with easements and other important features such as section lines, section corners, city boundary lines and monuments.
(2) Contour lines related to some established bench mark or other datum approved by the City engineer and having minimum intervals as follows:
(a) For slopes of less than five percent: show the direction of a slope by means of arrows or other suitable symbol together with not less than four spot elevations per acre, evenly distributed, one-foot contours.
(b) For slopes of five percent to 15 percent: two-foot contours.
(c) For slopes of 15 percent to 20 percent: five-foot contours.
(d) For slopes of over 20 percent: ten-foot contours.
(3) The location of at least one temporary bench mark within the subdivision boundaries.
(4) The location and direction of water courses and the location of areas subject to flooding.
(5) Natural features, such as rock outcroppings, marshes, wooded areas and isolated preservable trees.
(6) Existing uses of the property and location of existing structures to remain on the property after platting.
D. Proposed Plan of Subdivision: The following information shall be included on the tentative plan of a subdivision:
(1) The location, width, names, approximate grades and radii of curves of proposed streets. The relationship of streets to projected streets as shown on any development plan or, if no complete development plan is in effect in the area, as suggested by the Planning Commission to assure adequate traffic circulation.
(2) The location of possible street connections, (except where prevented by topography, lot dimensions, barriers or environmental constraints), at intervals of no more than 530 feet, both within the development and to adjacent land in compliance with City, County and Regional Transportation Plans. Street connections at intervals of no more than 330 feet are recommended in areas planned for the highest density.
(3) The location of pedestrian, bicycle and emergency vehicle accessways with spacing between street connections or accessways of no more than 330 feet, except where prevented by topography, barriers or environmental constraints.
(4) The location, width and purpose of proposed easements.
(5) The location and approximate dimensions of proposed lots and the proposed lot and block numbers.
(6) Proposed sites, if any, allocated for purposes other than single-family dwellings.
(7) Cul-de-sacs shall be designed in accordance with City and emergency access standards. Cul-de-sacs should be provided with a landscaped island designed to improve storm water retention. The property owners and the City shall enter into an agreement for maintenance of the island, whereby the property owners will provide on-going maintenance, and the City will provide periodic storm water system maintenance. Plant materials should be native and/or drought tolerant, but may be determined by the adjoining property owners.
E. Partial Development: If the subdivision proposal pertains to only part of the tract owned or controlled by the subdivider, the Planning Commission may require a sketch of a tentative layout for streets in the unsubdivided portion.
F. Explanatory Information with Tentative Plan: Any of the following information may be required by the Planning Commission and, if it cannot be shown practicably on the tentative plan of a subdivision, it shall be submitted in separate statements accompanying the plan.
(1) A vicinity map showing existing subdivisions and undivided land ownerships adjacent to the proposed subdivision and showing how proposed streets and utilities may be extended to connect to existing streets and utilities.
(2) Proposed deed restrictions, if any, in outline form.
(3) The location within the subdivision and in the adjoining streets and property of existing sewers, water mains, culverts, drain pipes and electric lines.
(4) For developments that are likely to generate more than 400 average daily motor vehicle trips (ADT’s), the applicant shall provide adequate information, such as a traffic impact study or traffic counts, to demonstrate the level of impact to the surrounding street system. The scope of the study or analysis shall be determined by the agency responsible for the affected roadway.
(5) The location of water resources as identified on the City Water Quality Map and in accordance with Section 430.300.
G. Supplemental Proposals with Tentative Plan: Any of the following may be required by the Planning Commission to supplement the plan of subdivision.
(1) Approximate center line profiles with extensions for a reasonable distance beyond the limits of the proposed subdivision showing the finished grade of streets and the nature and extent of street construction.
(2) A plan for domestic water supply lines and related water service facilities.
(3) Proposals for sewage disposal, storm water drainage and flood control, including profiles of proposed drainage ways.
(4) If lot areas are to be graded, a plan showing the nature of cuts and fills and information on the character of the soil.
(5) Proposals for other improvements such as electric utilities and sidewalks.
H. Preliminary Review of Tentative Plan: Upon receipt, the City Administrator shall furnish one copy of a tentative plan and supplementary material to the City Engineer and such other agencies such as ODOT, Multnomah County, Tri-Met, Metro and the Fire Marshall. Other agencies believed to have an interest shall be provided notice of the proposal. These officials and agencies shall be given a reasonable time to review the plan and to suggest revisions that appear to be in the public interest.