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HomeMy WebLinkAboutWSCO_LINC_WSWP Ordinance_20230613 Article 7.Natural Resource Protection §7.3 Watershed Protection Authority 2. The instrument for permanent protection shall include clear restrictions on the use of the resource conservation area. These restrictions shall include all restrictions contained in this section, as well as any further restrictions the applicant chooses to place on the use of the resource conservation areas. Where appropriate,the instrument shall allow for stream or habitat restoration. §7.3. Watershed Protection §7.3.1. Authority The Legislature of the State of North Carolina has,in G.S. §160D-926, General Ordinance Authority and in G.S. §143-214.5,Watershed Protection Rules, delegated the responsibility and authority to local governmental units to establish water supply watershed protection programs,to regulate land use and development within water supply watersheds, and to adopt regulations designed to promote the public health, safety and general welfare of its citizenry. §7.3.2. Applicability A. Unless specifically exempt below,the provisions of this section shall apply to development within the Watershed Protection Overlay(WPO), as established in 0. B. These regulations shall not be interpreted to interfere with any easement, covenant or other agreement between parties. However,if the provisions of these regulations impose greater restrictions or higher standards for the use of a building or land,then the provisions of these regulations shall control. C. These requirements shall not apply to development existing as of January 1, 1994 (existing development)except as provided in Article 10,Nonconformities and shall not apply to single-family detached,zero lot line, or alley-loaded unit developed on an existing lot. Expansion of structures classified as existing development(on any lot other than a lot containing a single-family residential development as the principal use)must meet the requirements of this section; however,the impervious surface area of existing development is not required to be included in the density calculations. An example of how this is to be interpreted is as follows: EXAMPLE A Facts 1. Property in the WS-IV Protected Area 2. Low density option used 3. Total lot area=65,000 sq.ft. 4. Existing impervious surface area of 14,000 sq.ft. 5. 51,000 sq.ft.Of undeveloped land Development Capabilities 1. Existing development(i.e.14,000 sq.ft.Not to be included in calculation) 2. Additional lot coverage permitted of up to 12,240 sq.ft. (51,000 sq.ft.X 24%maximum impervious surface area=12,240 sq.ft.) D. Nonconforming lots of record may be developed subject to the requirements of §10.6. §7.3.3. Public Health Requirements No activity, situation, structure or land use shall be allowed within the WPO district which poses a threat to water quality and the public health, safety, and welfare. Such Unified Development Ordinance Effective 8/31/2009 Lincoln County,North Carolina 7-3 §7.3 Watershed Protection Article 7.Natural Resource Protection Density and Impervious Surfaces Limitations conditions may arise from inadequate on-site sewage systems which utilize ground absorption; inadequate sedimentation and erosion control measures; the improper storage or disposal of junk,trash or other refuse within a buffer area;the absence or improper implementation of a spill containment plan for toxic and hazardous materials;the improper management of stormwater runoff,or any other situation found to pose a threat to water quality. S7.3.4. Density and Impervious Surfaces Limitations For the purpose of calculating impervious surface area,total project area shall include total acreage in the parcel on which the project is to be developed. A. WS-II Watershed Areas -- Critical Area (WS-II-CA) In order to maintain a predominately undeveloped land use intensity pattern, single- family residential uses shall be allowed at a maximum of one dwelling unit per two acres, or on lots having a minimum area of 80,000 square feet. All other residential and nonresidential development shall be allowed with a maximum 6 percent impervious surface area. No new permitted sites for land application of residuals or petroleum contaminated soils are allowed. No new landfills are allowed. 1. Permitted Uses The following uses and activities are permitted provided such uses are also permitted in the underlying zoning district and providing that the restrictions stated herein are met: (a) Agriculture, subject to the provisions of the Food Security Act of 1985 and the Food,Agricultural, Conservation and Trade Act of 1990; Agricultural activities conducted after January 1, 1993 shall maintain a minimum ten-foot vegetative buffer, or equivalent control as determined by the Soil and Water Conservation Commission,along all perennial waters indicated on the most recent versions of U.S.G.S. 1:24,000(7.5 minute) scale topographic maps or as determined by local government studies. Animal operations deemed permitted and permitted under 15A NCAC 2H .0217 are allowed. (NOTE: The Soil and Water Conservation Commission is the designated agency responsible for implementing the provisions of this section relating to agricultural activities.) (b) Silviculture,using best management practices(bmps)required to implement the provisions of the Forest Practices Guidelines Related to Water Quality(15 NCAC 1I.6101-.0209). (c) Residential development(single-family detached,zero lot line, alley loaded,two-family,multi-family development, and cluster residential subdivisions). (d) Nonresidential uses, excluding discharging landfills and sludge application sites,mining and quarrying activities, and the storage of toxic and hazardous materials unless a spill containment plan is implemented. 2. Density and Impervious Surfaces Effective 8/31/2009 Unified Development Ordinance 7-4 Lincoln County,North Carolina Article 7.Natural Resource Protection §7.3 Watershed Protection Density and Impervious Surfaces Limitations (a) Single-family Residential Development Single-family residential development, and cluster residential subdivisions development shall not exceed one dwelling unit per two acres on a project-by-project basis; alternatively, lots having an area of at least 80,000 square feet(excluding road right-of-way) are allowed. Cluster residential subdivisions(see Article 2) shall also be allowed. (b) All Other Residential and nonresidential All other residential and nonresidential development shall not exceed six percent impervious surface area on a project-by-project basis. For the purpose of calculating impervious surface area,total project area shall include total acreage in the tract on which the project is to be developed. B. WS-II Watershed Area -- Balance of Watershed (WS-II-BW) In order to maintain a predominantly undeveloped land use intensity pattern, single- family residential development shall be allowed at a maximum of one dwelling unit per acre; alternatively, lots having an area of at least 40,000 square feet are allowed. All other residential and nonresidential development shall be allowed a maximum of 12 percent impervious surface area. In addition,nonresidential uses may occupy ten percent of the balance of the watershed which is outside the critical area with a 70 percent impervious surface area when approved as a special nonresidential intensity allocation(SNIA). The Board of Commissioners may approve snias consistent with the provisions of this section by speciall use permit(See §9.11). Non-discharging landfills and sludge application sites are allowed. 1. Permitted Uses The following uses and activities are permitted provided such uses are also permitted in the underlying zoning district subject to the following: (a) Agriculture subject to the provisions of the Food Security Act of 1985 and the Food,Agriculture,Conservation and Trade Act of 1990; (b) Silviculture, subject to the provisions of the Forest Practices Guidelines Related to Water Quality(15 NCAC 1I.6101-.0209); (c) Residential development(single-family detached, zero lot line, alley loaded,two-family,multi-family development, and cluster residential subdivision development); and (d) Nonresidential development except no NPDES permits will be issued for landfills that discharge treated leachate. 2. Density and Impervious Surfaces (a) Single-family Residential Development Single-family residential development shall not exceed one dwelling unit per acre on a project-by-project basis; alternatively, lots having an area of at least 40,000 square feet(excluding road right-of-way)are allowed. Cluster residential subdivisions(see Article 2) shall also be allowed. (b) All Other Residential and nonresidential All other residential and nonresidential development shall not exceed 12 percent impervious surface area on a project-by-project basis. For the Unified Development Ordinance Effective 8/31/2009 Lincoln County,North Carolina 7.5 §7.3 Watershed Protection Article 7.Natural Resource Protection Density and Impervious Surfaces Limitations purpose of calculating impervious surface area,total project area shall include total acreage in the tract on which the project is to be developed. C. WS-III Watershed Areas -- Balance of Watershed (WS-III-BW) In order to maintain a low to moderate land use intensity pattern, single-family residential development shall be allowed at a maximum of two dwelling units per acre; alternatively, lots having an area of at least 20,000 square feet are allowed. All other residential and nonresidential developments shall be allowed a maximum of 24 percent impervious surface area on a project-by-project basis. In addition, nonresidential uses may occupy ten percent of the balance of the watershed outside the critical area(located within the jurisdiction of this UDO)with a 70 percent impervious surface area when approved as a special nonresidential intensity allocation(SNIA). The Board of Commissioners may approve snias consistent with the provisions of this subsection by special use permit(See §9.11). Non- discharging landfills and sludge application sites are allowed. 1. Allowed Uses: (a) Agriculture subject to the provisions of the Food Security Act of 1985 and the Food,Agriculture,Conservation and Trade Act of 1990. (b) Silviculture, subject to the provisions of the Forest Practices Guidelines Related to Water Quality(15 NCAC 1I.6101-.0209). (c) Residential development(single-family detached, zero lot line, alley loaded,two-family,multi-family development, and cluster residential subdivisions); and (d) Nonresidential development except no NPDES permits will be issued for landfills that discharge treated leachate. 2. Density and Impervious Surfaces (a) Single-family and Two-family Residential Single-family residential and two-family residential development shall not exceed two dwelling units per acre, as defined on a project-by-project basis. Alternatively, lots with a minimum area of 20,000 square feet (excluding road right-of-way) shall be allowed. Cluster residential subdivisions(see §7.3.6)shall also be allowed. (b) All Other Residential and nonresidential Development shall not exceed 24 percent impervious surface area on a project-by-project basis except that up to ten percent of the balance of the watershed located outside of the critical area and within the jurisdiction of the Ordinance may be approved for nonresidential uses to 70 percent impervious surface area on a project-by-project basis by special use permit(See §9.11). For the purpose of calculating impervious surface area,total project area shall include total acreage in the tract on which the project is to be developed. For expansions to existing development, the existing impervious surface area is not counted toward the maximum allowed 70 percent impervious surface area. D. WS-IV Watershed Areas -- Critical Area (WS-IV-CA) Only new development activities that require an erosion/sedimentation control plan under State law or approved local program are required to meet the provisions of Effective 8/31/2009 Unified Development Ordinance 7-6 Lincoln County,North Carolina Article 7.Natural Resource Protection §7.3 Watershed Protection Density and Impervious Surfaces Limitations this UDO when located in the WS-IV watershed. In order to address a moderate to high land use intensity pattern, single-family residential uses are allowed at a maximum of two dwelling units per acre(or 20,000 square foot lot, excluding road rights-of-way). All other residential and nonresidential development shall be allowed with a maximum impervious surface area of 24-50 percent depending on whether the low or high density option is used. The high density option shall only be allowed for use in the Catawba/Lake Norman Watershed. (See §7.3.9 for information on the high-density option.) No new sites for land application of residuals or petroleum contaminated soils are allowed. Landfills are specifically prohibited. 1. Permitted Uses (a) Agriculture subject to the provisions of the Food Security Act of 1985 and the Food,Agriculture,Conservation and Trade Act of 1990. Agricultural activities conducted after January 1, 1993 shall maintain a minimum ten foot vegetative buffer, or equivalent control as determined by the Soil and Water Conservation Commission, along all perennial waters indicated on the most recent versions of U.S.G.S. 1:24,000(7.5 minute) scale topographic maps or as determined by local government studies. Animal operations deemed permitted and permitted under 15A NCAC 2C .0217 are allowed. Commentary: The Soil and Water Conservation Commission is the designated agency responsible for implementing the provisions of this section relating to agricultural activities. (b) Silviculture, subject to the provisions of the Forest Practices Guidelines Related to Water Quality(15 NCAC 1I.6101-.0209). (c) Residential development(single-family detached, zero lot line, alley loaded,two-family,multi-family development, and cluster residential subdivisions). (d) Nonresidential development, excluding landfills, and sites for land application of sludge/residuals or petroleum contaminated soils. 2. Density and Impervious Surfaces (a) Single-family and Two-family Residential Single-family residential development, and cluster residential subdivisions development shall not exceed two dwelling units per acre on a project-by-project basis, or lots shall have an area of at least 20,000 square feet(excluding road right-of-way). Cluster developments(See §7.3.6)shall also be allowed. (b) All Other Residential and nonresidential Development shall not exceed 24 percent impervious surface area on a project-by-project basis if the low-density option is used and 50 percent impervious surface area if the high-density option is used. For the purpose of calculating the impervious surface area,total project area shall include total acreage in the tract on which the project is to be developed. E. WS-IV Watershed Areas -- Protected Area (WS-IV-PA) 1. General Unified Development Ordinance Effective 8/31/2009 Lincoln County,North Carolina 7_7 §7.3 Watershed Protection Article 7.Natural Resource Protection Density and Impervious Surfaces Limitations (a) Only new development activities that require an erosion/sedimentation control plan under State law or approved local government program are required to meet the provisions of this UDO when located in a WS-IV watershed. In order to address a moderate to high land use intensity pattern, single-family residential development shall be allowed at a maximum of two dwelling units per acre or 20,000 square foot lots, excluding road rights-of-way,when curb and gutter are provided or three dwelling units per acre when curb and gutter are not provided. All other residential and nonresidential development shall be allowed at a maximum of 24 percent impervious surface area on a project-by-project basis if the low-density option is used,or 36 percent for projects not having curb and gutter, and 70 percent impervious surface area on a project-by-project basis if the high-density option is used. The high density option may only be used in the Catawba/Lake Norman Watershed. Refer to Section 508 for more information on the high- density option. (b) Notwithstanding the above, in the Catawba/Mountain Island Lake, Catawba/Hoyle Creek, Catawba/Lake Wylie, and Catawba/South Fork Catawba River watersheds only,ten percent of the area of each such watershed located in a WS-IV(PA)district may be developed with new nonresidential projects and expansions to existing nonresidential developments with up to 70 percent impervious surface area in addition to the new development otherwise allowed in this district. 2. Permitted Uses Permitted uses include: (a) Agriculture subject to the provisions of the Food Security Act of 1985 and the Food,Agriculture,Conservation and Trade Act of 1990; (b) Silviculture, subject to the provisions of the Forest Practices Guidelines Related to Water Quality(15 NCAC 1I.6101-.0209); (c) Residential development,limited to single-family detached,two-family, multi-family development, and cluster residential subdivisions; and (d) Nonresidential development. 3. Density and Impervious Surface Limits (a) Single-family and Two-family Residential Single-family detached and two-family development and cluster residential subdivisions development shall not exceed two dwelling units per acre, on a project-by-project basis, or lots shall have an area of at least 20,000 square feet(excluding road right-of-way),when curb and gutter are provided; or three dwelling units per acre or lots shall have an area of at least 14,520 square feet(excluding road right-of-way)when curb and gutter are not provided. Cluster developments (See §7.3.6)are allowed. (b) All Other Residential and nonresidential Development shall not exceed 24 percent impervious surface area(with curb and gutter) or 36 percent impervious surface area(without curb and Effective 8/31/2009 Unified Development Ordinance 7-8 Lincoln County,North Carolina Article 7.Natural Resource Protection §7.3 Watershed Protection Interpretation of Watershed Area Boundaries gutter) on a project-by-project basis if the low-density option is used. Irrespective of the use of curb and gutter,projects may have maximum impervious surface areas of 70 percent if the high density option is used. (NOTE: The high density option is only available in the Catawba/Lake Norman Watershed.) For the purpose of calculating impervious surface areas,total project area shall include total acreage in the tract on which the project is to be developed. (c) Exception Notwithstanding the above,up to ten percent of the area located within a Catawba/Mountain Island Lake, Catawba/Hoyle Creek, Catawba/Lake Wylie, and Catawba/South Fork Catawba River watersheds which has a WS-IV(PA)district,may be developed with new nonresidential projects and expansions to existing nonresidential developments with up to 70 percent impervious surface area in addition to the new development otherwise allowed in this district. For expansions to existing development,the existing impervious surface is not counted toward the allocated 70 percent built upon area. S7.3.5. Interpretation of Watershed Area Boundaries Where uncertainty exists as to the boundaries of the watershed areas,as shown on the Watershed Map,the following rules shall apply: A. Where area boundaries are indicated as approximately following either road, alley, railroad or highway lines or centerlines thereof, such lines shall be construed to be said boundaries. B. Where area boundaries are indicated as approximately following lot lines, such lot lines shall be construed to be said boundaries. C. Where the boundaries of a particular-WPO district lie at a scaled distance more than 25 feet from any adjoining lot line,the location of said WS district shall be determined by use of the scale appearing on the Watershed Map. D. Where the boundaries of a-WPO district are located at a scaled distance of 25 feet or less from any adjoining lot line,the lot line may be used as said to be a"WS boundary". E. Where other uncertainty exists,the Director shall interpret the Watershed Map as to location of such boundaries. This decision may be appealed to the Board of Adjustment in accordance with §9.19. S7.3.6. Cluster Subdivision Cluster residential subdivisions(see Article 2)are allowed in the—WPO district(all watershed areas)under the following conditions: A. Maximum Density The overall density of the project meets the associated density or stormwater control requirements under these rules. Maximum densities for residential uses shall not exceed that specified for the respective watershed areas(See §7.3.4)and summarized below: Unified Development Ordinance Effective 8/31/2009 Lincoln County,North Carolina 7.9 §7.3 Watershed Protection Article 7.Natural Resource Protection Buffer Required Watershed Area Maximum Density(Units/Acre) WS-II-CA(Critical Area) 0.5 WS-II-BW(Balance of Watershed) 1.0 WS-III-BW(Balance of Watershed) 2.0 WS-IV-CA(Critical Area) 2.0 WS-IV-PA(Protected Area) 2.0,wl curb and gutter 3.0,w/o curb and gutter B. Other Requirements 1. Buffers must meet the minimum guidelines established in §7.3.7. 2. All impervious surfaces shall be designed and located to minimize stormwater runoff impact to the receiving waters and minimize concentrated stormwater flow. 3. Areas of concentrated density development are to be located in upland areas and away,to the maximum extent practicable,from surface waters and drainageways. Areas of concentrated density shall meet stormwater control requirements as described in §7.3.9,High Density Option. 4. The remainder of the tract not developed shall remain in a vegetated or natural state. 5. Cluster residential subdivision development shall transport stormwater runoff by vegetated conveyances to the maximum extent practicable. §7.3.7. Buffer Required A. A minimum 100 foot vegetative buffer is required for all new development activities that employ the high-density option; otherwise, a minimum 30 foot vegetative buffer for development activities is required along all perennial waters indicated on the most recent versions of U.S.G.S. 1:24,000 (7.5 minute) scale topographic maps or as determined by local government studies. Desirable artificial stream bank or shoreline stabilization is permitted. B. No new development is allowed in said buffer except for water-borne structures (e.g.,piers, docks, etc.)Or other structures such as flag poles, signs and security lights,which result in only de minimus increases in impervious area and public projects such as road crossings and greenways where no practical alternative exists. These activities should minimize impervious surface area, direct runoff away from the surface waters and maximize the utilization of stormwater Best Management Practices. §7.3.8. Nonconformities See §10.7. §7.3.9. High Density Option A. General Requirements 1. In any designated WS-IV watershed, any development(other than a single- family residential development)may occur using the high density option subject to approval by the Board of Commissioners under the rules and guidelines herein outlined. The use of the high density option for any particular project may be approved by special use permit(See §9.11). Where deemed necessary by the Board of Commissioners, such applications may be Effective 8/31/2009 Unified Development Ordinance 7-10 Lincoln County,North Carolina Article 7.Natural Resource Protection §7.3 Watershed Protection High Density Option submitted to the Division of Environmental Management's Water Quality Section for review and recommendation. 2. The use of the high density option for any single-family residential development shall be prohibited. Use of the high-density option within any WS-II or WS-III district shall also be prohibited. B. High Density Options Development Standards The Board of Commissioners may approve a project using the high density option (other than one for a single-family residential development)consistent with the following standards: 1. If the area proposed to be developed lies in a designated WS-IV Critical Area watershed, engineered stormwater controls shall be used to control runoff from the first inch of rainfall for development which contains a built-upon area of 24-50 percent. 2. If the area proposed to be developed lies in a designated WS-IV Protected Area watershed,engineered stormwater controls shall be used to control runoff from the first inch of rainfall for development which contains an impervious surface area of 24-70 percent(except that projects not using curb and gutter may be allowed to have built upon areas of up to 36 percent using the low-density option). C. Inspection Fees 1. Inspection of all stormwater control structures will be conducted: (a) Prior to the structure being placed into operation; (b) Annually once the stormwater control structures have been approved by the County, and (c) Any time after improvements,modifications or changes to said structures have been made by the owning entity. 2. A fee pursuant to §9.2.2.B, shall be required to be paid by the owning entity prior to each such inspection being conducted. D. Operations and Maintenance Plan 1. Any stormwater control structure approved by the Board of Commissioners shall be predicated on the developer and the County entering into a binding operations and maintenance plan. Said plan shall require the owning entity of the structure(s)to maintain,repair, and, if necessary,reconstruct said structure(s)in accordance with the operation and maintenance plan provided by the developer to the County. Said plan must be approved by the Board of Commissioners prior to or in conjunction with approval of the high density option for said project. 2. A separate plan must be provided by the developer for each stormwater control structure, containing, at a minimum,what operation and maintenance actions are needed and will be undertaken,what specific quantitative criteria will be used for determining when those actions are to be taken,and who is responsible for such actions. The Plan shall clearly indicate what steps will be taken for restoring a stormwater control structure to design specifications if a failure occurs. Unified Development Ordinance Effective 8/31/2009 Lincoln County,North Carolina 7-11 §7.3 Watershed Protection Article 7.Natural Resource Protection High Density Option 3. Amendments to the Plan and/or specifications of the stormwater control structure(s)may only be approved by the Board of Commissioners. Proposed changes shall be prepared by a North Carolina registered professional engineer or landscape architect(to the extent that the General Statutes allow) and submitted to the County for approval. Such amendments shall be accompanied by all information and fees prescribed in §9.2.2. 4. If the Board of Commissioners finds that the Plan, once approved, is inadequate for any reason,the Director shall notify the owning entity of any changes mandated by the County and a time frame in which changes to the Plan shall be made. E. Financial Guarantees All new stormwater control structures approved employing the high density option shall be conditioned on the posting of adequate financial assurance for the purpose of constructing,maintaining,repairing or reconstructing said devices. 1. If the Board of Commissioners approves the use of the high density option for a particular project, it may do so only after the applicant has posted a surety bond, cash, or equivalent security, in an amount not less than 1.25 times the cost of constructing the necessary stormwater control structure(s). Such financial security shall be made payable to Lincoln County and shall be in a form prescribed by the Board of Commissioners. All construction costs shall be verified by the County and the County may assess the applicant for actual costs associated with such verification. The total cost of the stormwater control structure shall include the value of all materials such as piping and other structures, seeding and soil stabilization, design and engineering, grading, excavation,fill, and etc. The costs shall not be prorated as part of a larger project,but rather shall be priced as an individual project. 2. Once the stormwater control structure(s)has been constructed and inspected in the manner provided in §7.3.9.G, and approved by the Board of Commissioners,the Board of Commissioners may authorize the release of up to 75 percent of the surety bond or other equivalent device outlined in §7.3.9.E.1. The remaining portion of the surety bond or equivalent device maybe released to the owning entity in accordance with §7.3.9.G. 3. Prior to said release,however,the applicant shall be required to deposit with the County either cash or similar instrument approved by the Board of Commissioners in an amount equal to 15 percent of the total construction cost (See §7.3.9.E)or 100 percent of the cost of maintaining,repairing or reconstructing said structure over a 20 year period,whichever is greater. The estimated cost of maintaining the stormwater control structure shall be consistent with the approved operation and maintenance plan provided by the applicant as outlined in §7.3.9.D. F. Default 1. Upon default of the applicant to complete the stormwater control structure as spelled out in the performance bond or other equivalent security,the Board of Commissioners may obtain and use all or any portion of the funds necessary to complete the improvements based on actual construction costs. The Board of Commissioners shall return any funds not spent in completing the improvements to the owning entity. Effective 8/31/2009 Unified Development Ordinance 7-12 Lincoln County,North Carolina Article 7.Natural Resource Protection §7.3 Watershed Protection High Density Option 2. Upon default of the owning entity to maintain,repair and, if necessary, reconstruct the stormwater control structure in accordance with the approved operations and maintenance plan,the Board of Commissioners shall obtain and use any portion of the security outlined in §7.3.9.F to make necessary improvements based on the actual costs borne by the County to make such improvements. G. Inspections 1. Inspections of Newly Constructed Stormwater Structures All new stormwater control structures shall be inspected by the County after the owning entity notifies the Director that all construction has been completed. At this inspection the owning entity shall provide: (a) A signed deed,related easements and survey plat for the structure in a manner suitable for filing with the Lincoln County Register of Deeds Office,if ownership of the stormwater control structure(s) is to be transferred to another person,firm, or entity. (This requirement will be waived for any repair work when such deed has previously been filed.) (b) A certification by an engineer or landscape architect(to the extent allowable by the General Statutes) stating that the stormwater control structure is complete and consistent with the approved Plan and all specifications previously stipulated by the County. (c) The Director shall forthwith present the materials submitted by the owning entity along with the County's inspection report to the Board of Commissioners for their review and approval. If the Board of Commissioners approves the inspection report and accepts the certification, deed and easements,the Director shall forthwith file said deed with the Lincoln County Register of Deeds Office. Release of up to 75 percent of the surety bond or equivalent security as called for in §7.3.9.E.1 shall be made in a manner as prescribed in §7.3.9.E.2. And §7.3.9.E.3. (d) If deficiencies are found as a result of the inspection,the Board of Commissioners shall direct the owning entity to make necessary improvements. Reinspections will be made thereafter. No release of any funds shall be made by the County until all deficiencies are properly addressed to the County's satisfaction. (e) No sooner than one year after approval of the stormwater control structure(s)by the County,the owning entity may petition the Board of Commissioners to release the remaining value of the posted bond or security called for in §7.3.9.E.1. Upon receipt of said petition,the County shall forthwith inspect the stormwater control structure to determine whether the structure is performing as designed and intended. Once the inspection is made,the Director shall forthwith present the inspection report and recommendations to the Board of Commissioners. (f) An occupancy permit shall not be issued for any structure within the permitted development until the Board of Commissioners approves the stormwater control structure in the manner as herein prescribed. 2. Annual Inspection of Stormwater Structures Unified Development Ordinance Effective 8/31/2009 Lincoln County,North Carolina 7-13 §7.3 Watershed Protection Article 7.Natural Resource Protection High Density Option (a) All stormwater control structures shall be inspected by the County on an annual basis to determine whether the structures are performing as designed and intended. Records of inspection shall be maintained on forms approved or supplied by the North Carolina Department of Environment and Natural Resources(NCDENR). Annual inspections shall begin within one year of approval of the Board of Commissioner's approval of the filing date of the deed for the stormwater control structure. A fee, in accordance with a fee schedule adopted by the Board of Commissioners shall be charged to the owning entity for annual inspections(and re-inspections)made. A copy of each inspection report shall be filed with the Director. (b) In the event the County's report indicates the need for corrective action or improvements,the Director shall notify the owning entity of the needed improvements and the date by which such improvements are to be completed. All improvements shall be consistent with the adopted operations plan and specifications. Once such improvements are made, the owning entity shall forthwith contact the Director and ask that an inspection be made. H. Vegetation and Grounds Management 1. Landscaping and grounds management shall be the responsibility of the owning entity of said structure(s). However,vegetation shall be not established or allowed to mature to the extent that the integrity of the structure(s)is in any way threatened or diminished, or to the extent of interfering with any easement of access to the structure. 2. Except for routine landscaping and grounds maintenance,the owning entity shall notify the Director prior to any repair or reconstruction of the structure. All improvements shall be consistent with the approved Plan and specifications for that structure. After notification by the owning entity, County staff shall inspect the completed improvements and inform the owning entity of any required additions, changes, or modifications needed to complete said improvements. A time period for making such changes shall also be stipulated by the County. A fee,in accordance with a fee schedule adopted by the Board of Commissioners, shall be charged to the owning entity for each inspection(or re-inspection)made. I. Stormwater Control Structure Specifications 1. All stormwater control structures shall be designed by either a North Carolina registered professional engineer or landscape architect(to the extent that the General Statutes allow). 2. Stormwater runoff shall be controlled through the use of Best Management Practices(bmps)that comply with the following standards: (a) All structural stormwater treatment systems shall be designed to achieve a minimum of 85 percent average annual removal for Total Suspended Solids (TSS). Two or more bmps can be used in series to achieve this requirement. Effective 8/31/2009 Unified Development Ordinance 7-14 Lincoln County,North Carolina Article 7.Natural Resource Protection §7.3 Watershed Protection High Density Option (b) Stormwater management measures must comply with the General Engineering Design Criteria for all projects requirements listed in 15A NCAC 2H.1008(c). (c) Stormwater management measures shall be designed to control and treat runoff from the first one-inch of rain. (d) The discharge rate following a one-inch rainfall shall draw down the temporary storage volume between 48 and 120 hours. Commentary: Low Impact Development (LID) techniques are encouraged and may be used to assist in meeting the above stormwater requirements. 3. The Design Manual includes a list of acceptable stormwater control measures, including specific design criteria for each stormwater practice. 4. If the specifications or guidelines of the Design Manual are more restrictive or apply a higher standard than other laws or regulations,that fact shall not prevent application of the specifications or guidelines in the Design Manual. 5. All land areas outside of any stormwater control structure shall be stabilized to restrain erosion within 21 calendar days after any land disturbance is complete. Upon completion of the stormwater control structure, a permanent ground cover shall be established and maintained as part of the maintenance agreement described in §7.3.9.D. 6. Should ownership(and maintenance) of the stormwater control structure be transferred to another person, firm, or entity, a description of the area containing the stormwater control structure shall be prepared and filed, consistent with §7.3.9.G.1(a) as a separate deed with the Lincoln County Register of Deeds Office along with any easements necessary for general access to the stormwater control structure. The deeded area shall include all stormwater control structures,pipes,berms, dikes,etc.,and sufficient area to perform inspections,maintenance,repairs,and reconstruction. 7. The pervious portions of any stormwater control structure(s)approved by the Board of Commissioners shall not be included when computing impervious surface. 8. In addition to the required vegetative filters, all land areas outside of the pond shall be provided with ground cover sufficient to restrain erosion within 30 days after any land disturbance. Upon completion of the stormwater control structure,a permanent ground cover shall be established and maintained as part of the maintenance agreement described in §7.3.9.D. 9. A description of the area containing the stormwater control structure shall be prepared and filed,consistent with §7.3.9.G.1 as a separate deed,with the Lincoln County Register of Deeds Office along with any easements necessary for general access to the stormwater control structure, should ownership(and maintenance)of the stormwater control structure be transferred to another person, firm, or entity. The deeded area shall include the detention pond, vegetative filters, all pipes and water control structures,berms, dikes, etc.,and sufficient area to perform inspections,maintenance,repairs and reconstruction. Unified Development Ordinance Effective 8/31/2009 Lincoln County,North Carolina 7-15 §7.4 Floodplain Protection Article 7.Natural Resource Protection Changes and Amendments 10. The pervious portions of any stormwater control structure(s) approved by the County Board of Commissioners shall not be included when computing impervious surface. §7.3.10. Changes and Amendments Under no circumstances shall the Board of Commissioners adopt such amendments, supplements, or changes that would cause this section to violate the Water Supply Watershed Protection Rules as adopted by the State. All amendments must be approved and filed with the State. §7.4. Floodplain Protection §7.4.1. Authorization A. General The Legislature of the State of North Carolina has in Part 6,Article 21 of Chapter 143 and Chapter 160D-923 of the North Carolina General Statutes delegated to local governmental units the responsibility to adopt regulations designed to promote the public health, safety, and general welfare. Therefore,the Board of Commissioners of Lincoln County,North Carolina, does ordain as follows: B. Findings of Fact 1. The flood prone areas within the jurisdiction of Lincoln County are subject to periodic inundation which results in loss of life,property,health and safety hazards, disruption of commerce and governmental services, extraordinary public expenditures of flood protection and relief, and impairment of the tax base, all of which adversely affect the public health, safety, and general welfare. 2. These flood losses are caused by the cumulative effect of obstructions in floodplains causing increases in flood heights and velocities and by the occupancy in flood prone areas of uses vulnerable to floods or other hazards. C. Purpose It is the purpose of this section to promote public health, safety, and general welfare and to minimize public and private losses due to flood conditions within flood prone areas by provisions designed to: 1. Restrict or prohibit uses that are dangerous to health, safety, and property due to water or erosion hazards or that result in damaging increases in erosion, flood heights or velocities; 2. Require that uses vulnerable to floods, including facilities that serve such uses,be protected against flood damage at the time of initial construction; 3. Control the alteration of natural floodplains, stream channels, and natural protective barriers,which are involved in the accommodation of floodwaters; 4. Control filling, grading, dredging, and all other development that may increase erosion or flood damage; and 5. Prevent or regulate the construction of flood barriers that will unnaturally divert flood waters or which may increase flood hazards to other lands. Effective 8/31/2009 Unified Development Ordinance 7-16 Lincoln County,North Carolina