The following supporting materials must accompany all preliminary plats:
A. Three (3) copies of a drainage study conducted and signed by a Wyoming registered professional engineer. Studies shall include:
1. Preliminary design and layout of existing and proposed storm sewer system,
2. Developed and undeveloped flow for 10-year and 100-year storms,
3. Description and location of all detention ponds proposed,
4. Analysis of the capacity of the downstream system and effect of drainage system; impacts on all adjacent lands,
5. Analysis of the effect of the drainage system on the drainage basin,
6. A statement of how the drainage plan complies with the town's stormwater management master plan,
7. All calculations used to arrive at the above data, including methodology, as set forth in the regional stormwater design manual, as adopted by the council.
B. The erosion control plan shall be prepared in accordance to DEQ standards and available to the town as requested.
C. Three (3) copies of a traffic study conducted and signed by a registered professional engineer experienced in traffic engineering. Studies shall be furnished for all residential developments consisting of twenty (20) or more dwelling units, and for all commercial and industrial sites generating more than seventy five (75) vehicle trips per peak hour.
1. Traffic Study: The engineer shall prepare a traffic study listing each type of land use, number of dwelling units, the number of square feet within a commercial or industrial building, the trip generation rates used and its reference within the sixth edition of the "Institute Of Traffic Engineer's Trip Generation Manual", dated 1997 (total daily traffic and A.M., noon, and P.M. peak hours) and the resultant trip generation entering and exiting the site. The related variable for each trip generation shall be identified. Trip generation values shall be calculated from data contained in the "Trip Generation Guide". In the event such data is not available for the proposed land use, the public services director shall approve estimated rates in writing prior to acceptance.
2. Adjacent Streets: The traffic study shall contain information on the adjacent street system surrounding the development. Information shall consist of existing and future average daily traffic volumes. Future traffic volumes shall be forecasted for the next twenty (20) years. The method of projection shall be approved of by the town engineer. All adjacent streets serving the development site shall contain the following information:
a. Current and projected A.M., noon, and P.M. peak hour traffic at street intersections, including turning movements;
b. Current and projected weekend peak hour traffic at street intersections, including turning movements (if necessary);
c. Current lane configuration and traffic controls for adjacent streets serving the development;
d. A site plan of the development showing adjacent land uses within one-half (1/2) mile;
e. Traffic control structures and signage currently installed;
f. Current and future level of service for streets adjacent to the development site. The level of service for the current street traffic volume shall be based upon information found in the MPO's long range transportation plan;
g. The estimated average daily traffic (ADT) to be generated from the development site and its impact on the adjacent street system. The ADT volume shall be added to both the current street system and the future street system for the next twenty (20) years;
h. All current peak hour traffic volumes and street total daily traffic counts must be actual data counts not more than two (2) years old. Peak hour volumes or street ADTs may not be extrapolated from other street intersections or systems unless approved in writing from the town engineer;
i. A listing of all traffic accidents over the past three (3) years at all intersections within one-fourth (1/4) mile of the development;
j. A site location map showing adjacent land use and zoning within one-fourth (1/4) mile surrounding the proposed development.
D. Three (3) copies of street lighting design information (if not shown on preliminary plat), to include:
1. Distance between streetlight poles;
2. Number and type of exterior lighting poles and their location;
3. Heights of poles;
4. Size and number of fixtures; and
5. Explanation of how the design conforms to the minimum lighting standards.
E. Three (3) copies of the preliminary water and sewer study prepared in accordance with the adopted policies of the town and Wardwell water and sewer district.
F. General information about the project, which shall be on the plat where possible, including:
1. A general description of the project;
2. A general discussion of the public facilities and services necessary to support the project, to include:
a. Description of any recreational areas and services the developer intends to provide, i.e., public or private parks, tennis courts, swimming pools, etc.;
b. Description of any fire lanes, fire hydrants or other fire protection devices the developer intends to provide;
c. Description of any commercial or shopping areas to be included within the development; and
d. An analysis of any natural hazards which are located in the area, as identified by the adopted "Natrona County Natural Geologic Hazards Study" (1981). (Ord. 2012-04, 7-17-2012)