(A) Generally.
(1) All lots to be platted shall have access to a street, and all proposed streets shall be installed in accordance with the requirements set forth below prior to final plat approval unless otherwise permitted pursuant to § 152.30. All proposed streets shown on the final plat shall be designated as either public or private streets. For all private streets, the subdivider shall prepare a subdivision streets disclosure statement to be issued to a prospective buyer. The subdivision streets disclosure statement shall include an explanation of the consequences and responsibility for maintenance of the private street.
(2) All streets and roads in the town shall be designed and built in accordance with existing policies and standards of the State Department of Transportation, and all subdivision streets and roads shall be designed and built in accordance with the requirements as set forth by the Department of Transportation, Division of Highways’ Subdivision Roads Minimum Construction Standards, (latest edition as revised), with only the following variations:
(a) All pavement widths shall be at least 20 feet wide. All street rights-of-way shall be 40 feet, but with the advance written consent and agreement of the town’s Department of Public Works, there may be selected areas within the right-of-way that certain sound and healthy trees may be left standing, upon the determination by the Department of Public Works that the placement and maintenance of utilities will not be adversely affected;
(b) All pavement surfaces shall be asphalted and all asphalt paving material, including aggregate base course, bituminous base and surface courses, and prime and tack coats shall meet the requirements of the applicable sections of the latest edition of the State Department of Transportation Standard Specifications for Roads and Structures. Bituminous concrete base course shall be Type MB and bituminous concrete surface course shall be Type 1-2. Prime and tack coats grades shall be specified with the job mix formula;
(c) Cul-de-sac streets shall be designed according to DOT standards; however, permanent dead-end streets shall be no longer than 900 feet in length;
(d) All roadways shall be constructed of a minimum of eight inches compacted aggregate base course, and two inches of bituminous surface course Type 1-2;
(e) All pavements shall be designed by a licensed professional engineer with such design being based on the load-bearing capabilities of the proposed subgrade material in accordance with the California Bearing Ratio (CBR) design method. The design shall also be based on the traffic loadings and volumes anticipated for the proposed pavement, including temporary construction vehicles. The calculations, traffic data and other design information, including the soils testing data shall be submitted to the town prior to and as a condition for the preliminary plat approval by the town’s Consulting Engineer;
(f) Fill material shall meet the requirements of the classifications in accordance with the Unified Soil Classification Systems as follows:
1. Acceptable classifications. GW, GP, GM, SW, SP, SC, SM, ML, and CL; and
2. Unacceptable classifications. PT, OH, OL, CH, and MR
(g) Fill material for subgrade shall have a minimum laboratory dry weight, ASTM 1557, of at least 100 pounds per cubic foot unless specifically exempted from this requirement by the Town Engineer;
(h) The required thickness of the aggregate base course and the asphalt base and surface courses shall be compacted thicknesses;
(i) The standard Proctor method of moisture density relationship test, ASTM D-698, shall be used to determine the maximum laboratory dry density and the optimum moisture content of the material, which is used for fill;
(j) The upper two feet of the soil subgrade in paved areas shall be compacted until its density is not less than 98% of the maximum dry density of the same material. Fill beneath the pavement below a depth of two feet and fill used to construct the roadway shoulders shall be compacted to a minimum of 95% of the maximum laboratory dry density;
(k) Each layer of the aggregate base course material shall be compacted to a density equal to at least 100% of the maximum laboratory dry density. The bituminous concrete base and surface courses shall be compacted to a density of at least 95% of the maximum theoretical density as determined by the Marshall method test;
(l) Non-bituminous bases beneath a bituminous pavement of four inches or less in thickness and non-bituminous bases beneath any bituminous pavement on roadways with grades of 15% or greater shall receive a prime coat treatment. Tack coat treatment shall be applied to side slopes with grades of 1:1 or steeper. Prime and tack coats shall be applied in accordance with the State DOT specifications; and
(m) The State Department of Transportation’s Subdivision Roads Minimum Construction Standards, contain the necessary design and construction criteria for subdivision streets, including requirements for right-of-way, pavement width, shoulder width, cut and fill slopes, design speed, minimum site distance, intersection design, and the like, with the specific exception that the right-of-way width for subdivision streets with shoulder section shall be 40 feet, and the pavement width with shoulder sections shall be at least 20 feet as referred to in division (A)(2)(a) above.
(B) Review of subdivision road plans. Street plans for all subdivisions within the town shall be reviewed by the town’s Consulting Engineer and a recommendation provided to the Planning Commission and Board of Commissioners indicating whether the proposed street plans meet the street requirements as specified in division (A) above prior to preliminary plat approval.
(C) Plan preparation. The plans for all streets shall be prepared by a registered engineer.
(D) Proposals. Proposals for street extensions or connections to an existing town street shall require a new street permit. (See § 152.07(A).)
(Ord. passed 7-17-1984)