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Planning Commission
Friday, July 16, 2021, 10:00am
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AGENDA

WILSON COUNTY PLANNING COMMISSION

Friday, July 16, 2021

10:00 a.m.

 

CALL TO ORDER

ADMINISTER OATH

APPROVAL OF MINUTES: June 18, 2021

Old Business:  

Deferred at the June 18, 2021 meeting                                                        

  • Amendment to the Wilson County Zoning Ordinance:

Under Article 6 ADMININSTRATION, ENFORCEMENT AND INTERPRETATION, SECTION 6.50 AMENDMENTS; Add the following language to Subsection 6.50.01 as shown in Bold, underlined italics:

Any request for rezoning  amendment must include submittal of a preliminary site assessment consisting of a surveyed drawing or boundary document in plan view, drawn to a legible scale, that clearly indicates blue line streams; regulatory floodplains and evident naturally occurring floodplains that are as yet un-mapped by FEMA;  Evident areas of Spring activities, well locations, springhouses; Caves and sinkholes and other evident karst features; wetland areas or marsh areas; Sensitive slope areas due to the existence of extreme slope or lack of slope; and areas of the property that may otherwise be impacted environmentally by on-site or nearby pollution or other feature; and any areas potentially impacted by upstream small dam act features with location of dam and specific details.  This survey and requisite data should be prepared by a surveyor or other individual licensed to perform such work in the State of Tennessee.

Site Plan-         Speedway IND Park Ph. 2 Lot 10 Bldg. 10, 1 lot

                         Richard Petty Way (Marty Robbins Drive) 141/26.05

Wilson County, Tennessee

Sinkhole / Karst Feature Policy

and/or

Amendment to Zoning Ordinance

1.) General Information

Wilson County and the surrounding areas have several locations characterized by karst formations (or sinkholes) which can significantly influence local hydrologic-geologic conditions, surface drainage and subsurface water movement.  Areas of karst topology have a high potential for the formation of sinkholes and caves.

Storm water runoff that flows into sinkholes is transmitted through the ground-water system in a network of interconnected conduits and is finally discharged at resurgent locations. If the storm water runoff flow rate exceeds the capacity that a sinkhole can accept, flooding is probable. If the storm water runoff is polluted, the ground water may become contaminated, creating a serious health and safety issue.

According to the Tennessee Department of Environment and Conservation, any closed depression found in karstic topological regions is a sinkhole. All sinkholes are considered to be storm water structures, and appropriate permitting or reviews by the Wilson County Stormwater Department will be required.

a.) Class V Injection Wells

A Class V Injection Well is a well used to drain surface water, primarily storm water runoff, into a subsurface formation.

Injection Wells are generally designed to allow large amounts of runoff to be drained into subsurface formations. The most common design involves installation of a standpipe which allows the runoff to flow down and into subsurface formations. The standpipe is surrounded by graded rock fill and the sinkhole is lined with geotextile material.

Properly constructed, the water path is limited to the standpipe, preventing water erosion of the limestone formation and further dissolution of the limestone substrate.

Conversion of a sinkhole to an Injection Well requires a permit issued by the Tennessee Department of Environment and Conservation.  A copy of this TDEC permit and the supporting documentation (engineered plan, details and geotechnical information) is to be provided to the Wilson county Stormwater Department for tracking purposes.

Wilson County does not advocate the creation of Injection Wells            due to the potential for pollution introduction to area aquifers and due to ongoing maintenance and permitting concerns. It is preferred that sinkholes remain undisturbed.

 

b.) Caves

Caves are formed in karstic areas by the same process that results in sinkholes. A cave provides direct access to subsurface formations and has the same potential for pollution of groundwater as sinkholes. Caves are storm water structures regulated by the Wilson County Storm Water Department. The same water quality buffer requirements that are applied to sinkholes are also required for caves.

In all cases, plans submitted for review to the Wilson County Stormwater Department must show all known or suspected caves and any associated water quality buffer zones that may be applicable (such as stream buffers, etc.).

2.) Sinkhole Options

a.) Leave the Sinkhole Untouched: The sinkhole area and existing vegetation would remain undisturbed during and after any area development. In case of an open throat that may create a safety hazard, or if illegal dumping is a problem in the area, the sinkhole may be fenced and posted with warning signs.

Maintenance shall be limited to removing dead or diseased plant material, repairing erosion problems internal to the buffer, clean up after a storm, or removal of invasive plants. Woody vegetation should be removed by hand. Vegetative root systems shall be left intact to maintain the integrity of soil. It is permissible to remove individual trees from water quality buffer zones if there is danger of the tree falling and causing damage to dwellings or other structures. The root wad or stump should be left in place to maintain soil stability.

The following activities are specifically forbidden within the sinkhole and buffer area:

  • Filling or dumping
  • Using, storing, or applying pesticides, herbicides, and fertilizers
  • Campfires, burning of plant waste or trash

No person shall place or cause to be placed any substances or objects, other than storm water runoff, in any sinkhole or sinkhole drainage area in such a way as to allow such substances or objects to be washed into a sinkhole during storm events.

All legal liability for the sinkhole remains with the property owner.

b.) Remediation (Repair): While Wilson County does not advocate the remediation of sinkholes due to the possibility of failure at a later date, a landowner may remediate a sinkhole after:

 

 (a) appropriate geophysical surveys are performed; and

(b) hydrologic and hydraulic analyses have been conducted.   

It must be demonstrated that the proposed sinkhole remediation/filling will be hydrologically managed.  Filling of a sinkhole will result in additional surface water downstream of the natural throat and depression.  This excess generated surface water must be included and managed in the development’s drainage design and calculations.  It is preferred that sinkholes remain undisturbed.

Prior to construction, the landowner must submit a report consisting of appropriate geophysical surveys performed by a geotechnical professional or engineer licensed        to operate in the State of Tennessee. The geophysical survey must clearly demonstrate that the remediated sinkhole will be stable and will not pose a threat to public health and safety.  In addition, a drainage report prepared by a licensed professional engineer will be required to identify any drainage concerns or issues that need to be addressed.

The structure remediation plan must be in accordance with accepted TDOT and TDEC practices and sound engineering principles. If the Wilson County Stormwater Department deems it necessary, the plans may be required to be reviewed and evaluated by an independent engineer, selected by the Wilson County Stormwater Department, at the landowner’s expense.  Review fees determined by the County will be assessed to cover this cost.

Maintenance, ownership and legal liability will remain the responsibility of the landowner, unless and until the landowner transfers ownership to another party (i.e.:  a homeowner’s association or individual landowner). Transfer of ownership will also transfer maintenance responsibility and legal liability for the structure.

c.) Conversion to a Class V Injection Well: While Wilson County does not advocate the construction of Class V Injection Wells due to the possibility of failure at a later date and due to the high potential for pollution introduction into the aquifer, a landowner may convert a sinkhole to a Class V Injection Well, after appropriate geophysical surveys and using an engineering plan accepted by Wilson County Stormwater Department. It is preferred that sinkholes remain undisturbed.

The Injection Well plans must be in accordance with accepted TDOT and TDEC practices and sound engineering principles. The minimum design standards for flood management will be based on a 100-year, 24-hour design storm, and assume plugged conditions (zero cubic feet per second inflow) for the sinkhole. If the Wilson County Stormwater Department deems it necessary, the plans  may be required to be reviewed and evaluated by an independent engineer, as determined the Wilson County Stormwater Department, at the landowner’s expense.  Review fees determined by the County will be assessed to cover this cost.

A TDEC Class V Injection Well permit must be obtained by the landowner and a copy of this permit must be submitted to the Wilson County Stormwater Department before any alterations to the area surrounding the sinkhole occur.          A map showing the full extent of the sinkhole structure and plans for the construction of the Injection Well must be submitted with the development TDEC plans and will also be shown on the post construction as-built plans. The area will be protected by a water quality buffer. No structures will be allowed to be built within this buffer zone.  This permit and any plans will be referenced in a Stormwater Maintenance Agreement and Long Term Management Plan for the property, and this Agreement recorded with Wilson County Register of Deeds.

Maintenance, ownership and legal liability will remain the responsibility of the landowner, unless and until the landowner transfers ownership to another party (i.e.:  homeowner’s association or individual landowner). Transfer of ownership will also transfer maintenance responsibility and legal liability for the structure. The new owner would be required to submit an Injection Well Permit application to TDEC and obtain an Injection Well Operations permit, a copy of which must be provided to the Wilson County Stormwater Department.

3.) Wilson County Liability

The Wilson County Stormwater Department and this policy statement shall not create a liability on the part of, or a cause of action against, Wilson County, Tennessee, or any officer or employee thereof for damages that result from reliance on these regulations or policies, or any administrative decision lawfully made there under.

New Business

Election of Officers

Site plans and Plats

01.)  Site Plan-Big Rig Trucking (Couchville PK. Lot 4)                                     1 lot

        Couchville Industrial Boulevard                                                              137/2.19

        Commission District 13 Sonja Robinson                                      zoned C-3 Hwy. Comm. PUD

02.)  Combination-Midway 840 Phase 2                                                        6 lots

        Couchville Pike                                        138/78.00, 80.00, 81.00, 81.01, 83.00, 86.00

        Commission District 13 Sonja Robinson                                                  zoned C-4

03.)  Site Plan-Midway 840 Phase 2                                                               1 lot

        Couchville Pike                                        138/78.00, 80.00, 81.00, 81.01, 83.00, 86.00

        Commission District 13 Sonja Robinson                                                  zoned C-4

04.)  Site Plan-Crown Castle/Dish Wireless NW Rutland co-location             1 lot

        527 NW Rutland Road                                                                             77/52.07

        Commission District 25 Justin Smith                                                       zoned R-1

05.)  Site Plan-Crown Castle/Dish Wireless Quarry Road co-location            1 lot

        2434 Quarry Road                                                                                   71/69.00

        Commission District 25 Justin Smith                                                       zoned R-1

06.) Rsb.; Harry Morse Jr. Property Lots 2 & 3                                               3 lots

 Burford Road                                                                                            23/110.10

       Commission District 6 Kenny Reich                                                         zoned A-1

07.) Site Plan-Cainsville Road Market                                                            1 lot

       1717 Cainsville Road                                                                                82/157.00

       Commission District 21 Mike Kurtz                                                          zoned C-1

08.) Rsb.; Speedway Industrial Park Lot 6                                                      2 lots

       Darrell Waltrip Drive                                                                               141/26.08

       Commission District 13 Sonja Robinson                                                  zoned C-4

 

09.) Site Plan-Speedway Industrial Park Lot 6B Building 9                             1 lot

       Darrell Waltrip Drive                                                                               141/26.08

       Commission District 13 Sonja Robinson                                                  zoned C-4

 

Plats for affirmation

Gibbs Estate, 1 lot, Sugar Flat Road, 60/35.03 po

Rsb.; George Lannom Property Lots 3 & 4, 1 lot, Ben Green Road, 65/13.05, 13.06

Subdv.; McCracken Property (Charles Sullivan Property), 1 lot, Sullivan Bend Road, 78/49.025

Rsb.; Oak Point Subdivision Section C Lot 56, 1 lot, Oak Point Terrace, 99L/A/7.00, 100/65.01