Disposition Summary

Approve the alternative design standard based on the recommendation of the Knox County Department of Engineering and Public Works.

Approve the Concept Plan subject to 11 conditions.

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Staff Recommendation

Approve the alternative design standard based on the recommendation of the Knox County Department of Engineering and Public Works.

Approve the Concept Plan subject to 11 conditions.

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1) Connection to sanitary sewer and meeting other relevant utility provider requirements.
2) Provision of street names consistent with the Uniform Street Naming and Addressing System within Knox County (County Ord. 91-1-102), including but not limited to addressing reassignment for the existing residences that will access the new internal roads.
3) Construction of a sidewalk connection to the school property from the Road 'D' cul-de-sac, as shown on the Concept Plan. The sidewalk shall be located in a common area. The design details will be worked out with Knox County Engineering and Public Works during the design plan phase.
4) Providing the Road 'D' stub-out as shown on the concept plan and providing notification of future connection per section 3.04.C.2 of the Subdivision Regulations. The paved surface of the stub-out can be stopped short of the adjacent property line if determined necessary by Knox County Engineering and Public Works during the design plan phase to more easily allow for connection from the adjacent property in the future.
5) Implemention of the recommendations outlined in the Transportation Impact Analysis, prepared for CMH Homes Development by Ajax Engineering (Revised 12/14/2023), as revised and approved by the Knox County Department of Engineering and Public Works and Planning staff (see Exhibit B). The design details and implementation of the recommendations shall be worked out with the Knox County Department of Engineering and Public Works during the design plan stage for the subdivision.
6) Replacement of all existing sidewalks disrupted by the proposed development.
7) Road 'A' must be graded to accommodate future sidewalks.
8) Provision of access to the properties to the south via the existing 50-ft joint permanent access easement until new driveway connections to those properties are constructed.
9) Providing a sight-distance easement on Lot 53 if required by Knox County Engineering and Public Works during the design plan phase. If required, the driveway must have a depth of 20 ft outside of the sight-distance easement.
10) Meeting all applicable requirements of the Knox County Department of Engineering and Public Works.
11) Meeting all applicable requirements of the Knox County Zoning Ordinance.

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This proposal adds 3 lots to a concept plan and development plan that was approved by the Planning Commission in October 2023 (10-SB-23-C/10-B-23-DP). The addition of these 3 lots yields a total of 74 lots in this subdivision, which comprises approximately 20.21 acres (3.6 du/ac). The property was rezoned from A (Agricultural) to PR(k) (Planned Residential) up to 3.7 du/ac in September 2023 (8-F-23-RZ).

ROAD STUB-OUT
The revised layout retains a road stub-out at the southern terminus of Road 'D'. This is also a condition of approval (#4). The concept plan shows the paved road surface extending to the southern boundary of the development. The recommended condition allows Knox County Engineering and Public Works to approve the pavement to stop short of the southern boundary if it will more easily allow the future road connection to tie in.

TRANSPORTATION AND SIDEWALK IMPROVEMENTS
A sidewalk connection is being provided from the Road 'D' cul-de-sac to the South-Doyle High School property line. Condition #7 requires Road 'A' to be graded to accommodate future sidewalk installation.

Condition #5 requires the applicant to implement the recommendations of the transportation impact letter (TIL) (see Exhibit B). These uring the design plan phase to evaluate the need for a right or left turn lane on Tipton Station Road. Due to the proximity of the school, a TIL was provided and a left turn lane is not warranted at this time.

ALTERNATIVE DESIGN STANDARD REQUIRING PLANNING COMMISSION APPROVAL
Alternative Design Standard #1: When a road is longer than 1,000 ft, the subdivision regulations require the horizontal curve radius to be a minimum of 250 ft. Otherwise, the minimum horizontal curve radius is 100 ft. Road 'B' is approximately 1,050 ft long from its intersection with Road 'D' to its terminus south of its Road 'E' intersection. While the road is longer than 1,000 ft, the road segments on either side of the Road 'A' intersection are significantly less than 1,000 ft. Very little vehicle traffic will travel the full distance of Road 'B'. The proposed 100 ft radius is near Road 'A', which is where most traffic will come from.The sharp curve will naturally keep speeds below the posted 25 mph speed limit through the curve because of the short distance for acceleration. The minimum horizontal curve radius for AASHTO at 20 mph is 86 ft.