§ 53.024 MAJOR PROJECT SITE; CONSTRUCTION PLAN.
   (A)   Construction plans. For a single-family, residential development consisting of 4 or fewer lots, or for a single-family, residential strip development where the developer offers for sale or lease without land improvements, and the project is not part of a larger common plan of development and sale, a project site owner must develop and submit a set of construction plans containing storm water quality measures specifically selected to achieve the minimum project site requirements specified in § 53.025 of this chapter.
   (B)   Construction plan components. The construction plan must include the following 4 major components:
      (1)   Project narrative and supporting documents; see division (C)(1) below;
      (2)   Vicinity map; see division (C)(2) below;
      (3)   Project site layout; see division (C)(3) below; and
      (4)   Storm water pollution prevention plan; see division (C)(4) below.
   (C)   Components. Each of the 4 major components of the construction plan must consist of the following sub-components and their subdivisions of content:
      (1)   Project narrative and supporting documents including the following information:
         (a)   An index indicating the location, in the construction plans, of all required items in this section;
         (b)   Description of the nature and purpose of the project;
         (c)   Legal description of the project site. The description must be to the nearest quarter section, township, and range, and include the civil township;
         (d)   Soil properties, characteristics, limitations, and hazards associated with the project site, and the measures that will be integrated into the project to overcome or minimize adverse soil conditions;
         (e)   Hydrologic unit code (14-digit code) available from the United States Geologic Survey (USGS) to indicate within which watershed or watersheds the project lies; and
         (f)   Identification of any other state or federal permits that are required for construction activities associated with the project site owner's project site.
      (2)   Vicinity map depicting the project site's location in relationship to recognizable local landmarks, towns, major roads, and railways. The applicable portion of a USGS topographic quadrangle map; or a county or municipal road map with the project site limits inked in will suffice.
      (3)   A project site layout that must include the following information:
         (a)   Location and name of all wetlands, lakes, streams, waterways, and drains on, or adjacent to, the project site;
         (b)   Location of all existing structures on the project site (if applicable). One hundred year flood plains, floodway fringes, and floodways; (Note if none exists)
         (c)   Soil map of the predominant soil types, as determined by the USDA, NRCS Soil Survey, or equivalent publication, or as determined by a soil scientist. The soil map must include a soil legend;
         (d)   Identification and delineation of the pre-development vegetative cover such as grass, weeds, brush, and trees on the project site;
         (e)   Land use of all adjacent properties;
         (f)   Existing and proposed topography- extending at a minimum of 50 feet beyond the property lines to adequately indicate drainage patterns on and off the project site. The contour intervals shall be drawn in accordance to the following criteria:
            1.   Average ground slope between 0 and 2% use 1-foot contour intervals;
            2.   Average ground slope between 2 and 10% use 2-foot contour intervals; and
            3.   Average ground slope greater than 10% use 5-foot contour intervals.
         (g)   The Town of Chandler Engineer, Storm Water Management Board or Storm Water Department Manager reserves the right to determine the appropriateness of the contour intervals and request additional spot elevations to adequately indicate drainage patterns on and off the project site; and
         (h)   Location of all proposed site improvements, including roads, utilities, lot delineations and identifications, and proposed structures.
      (4)   A Storm Water Pollution Prevention Plan (SWP3) associated with construction activities. The SWP3 must be assembled to meet, at a minimum, the requirements, provisions, and criteria of §§ 53.025 and 53.045 of this chapter, and must include the following information:
         (a)   Delineation of all proposed land disturbing activities, including off-site activities that will provide services to the project site;
         (b)   Location of all soil stockpiles and borrow areas;
         (c)   Location, size, and dimensions of all storm water drainage systems such as inlets, culverts, storm sewers, and conveyance channels;
         (d)   Locations where storm water potentially will be directly discharged into ground water, such as abandoned wells or sinkholes; (Note if none exists)
         (e)   Location of every specific point where storm water discharge will leave the project site;
         (f)   Name of all receiving waters. If a discharge is to a separate municipal storm sewer, identify the name of the municipal operator and the ultimate receiving water;
         (g)   Location, dimensions, detailed specification, and construction details of all appropriate temporary and permanent storm water quality measures, ECMs, and BMPs;
         (h)   Plans for appropriate temporary stabilization, permanent stabilization, and final stabilization compliant with this subchapter, and a sequence for the implementation of applicable stabilization;
         (i)   Temporary, permanent, final stabilization plans must include the following:
            1.   Specifications and application rates for soil amendments and seed mixtures; and
            2.   The type and application rate for anchored mulch.
         (j)   The project site owner's self-monitoring program including plan implementation and procedures.
   (D)   Illustrations. Plan and profile sheets, project site layouts, plats, and vicinity maps, must be drawn to a standard engineering scale as indicated on each sheet, plat or map, and be oriented north as indicated by a north arrow on each sheet, plat, or map. All dimensions must be accurately scaled, drawn, and labeled with dimensions given in feet and tenths of a foot.
   (E)   Revision of approved construction plans. The requirements for construction plan content enumerated in this section are qualified by the following statements:
      (1)   The Town of Chandler Engineer, Storm Water Management Board or Storm Water Coordinator may require, upon finding reasonable cause, the revision of a construction plan if it is determined that a modification or modifications are necessary to accomplish adequate control the quantity or quality of storm water runoff, in accordance with this subchapter or with applicable federal, state, and local rules, from a project site due to site conditions or project specification changes identified, effected, or extant during or after plan review and approval.
      (2)   If the Town of Chandler Engineer, Storm Water Management Board or Storm Water Department Manager requests a revised construction plan under this division, the project site owner must submit the revised plan to the appropriate entity or entities within 21 calendar days of a request for plan revision.
(Ord. 2006-6, passed - -; Am. Ord. 2008-10, passed 11-17-2008)