CHARLOTTE-MECKLENBURG ENGINEERING DEPARTMENTS



-7620-190500Mecklenburg County Land Development Review Site Checklist 2014Project Name Date Reviewed:Reviewer: Telephone:Contact: Telephone:GENERAL SUBMITTAL REQUIREMENTSExisting and proposed paved areas, buildings, structures & utilities.Off-site construction or grading requires a letter from the affected property owner granting permission.Is site adjacent to imminent NCDOT, Transit or Town project?If yes, written approval is required from respective authority.Zoning: Parcel Tax Number:Copy of Rezoning Petition in plansCD NotesJurisdiction (Town or ETJ)Vicinity mapLegible Scale (1:100 max)North arrowProperty Boundary and Adjoining Property Boundaries, Owners, and ZoningPervious and Impervious Area (new and/or existing)Adjacent existing streets & drainageTitle block w/ site name & locationLabel Contours (2’ max. interval, existing & proposed)Storm Drainage Calculations (Sealed)SWIM Buffer PresentWatershed Overlay District (List drainage basin)Surveyed Right of WayWetlands Permits (Army Corps/DWQ)Sealed Retaining Wall Design (Note about shop drawings)Retaining walls > 4 ft (residential) or 5 ft (commercial) in height requires a permit from Code Enforcement prior to construction.Retaining walls involving a culvert and/or located within the influence of a road must be reviewed and approved by Land Development. Culverts must have headwalls or be collared. Geogrid may not be allowed under pavement per Town policy. Utility conflicts with Geogrid must be considered.Note on plans that construction of wall cannot begin until all necessary permits are acquired.Huntersville – Retaining walls that are in and/or affect public right-of-way must be reviewed and approved by the Town (Any questions contact Max Buchanan).If project falls inside CATS corridor buffer, coordinate with David Carol or Brian Nadolny.(Any project within 100’ of existing or proposed track layout)CHECKLIST COMPLETION ITEMS (Grading Permit not issued until completion of all applicable items)NCDOT Driveway Permit: 4 sets of completed applications with original signatures (copies are not allowed)All applicable notes are on plans per MCLD Plan Notes ChecklistHealth Department approval for proposed septic system locationsDWQ, Army Corps, and/or Water Quality (for buffer disturbance, SSMP) approval (if applicable)Approved Floodplain Development Permit for any development within the Community Special Flood Hazard Area Town planning approvalAll BMP easements and BMP Maintenance Plan (PCO 20), Operation and Maintenance Agreement/Declaration of Covenants (PCO19) are recorded. These must be reviewed, and approved by LUESA staff. Copies of the recorded documents must be received prior to plan approval.BMP Inset Tables: All applicable items on Post-Construction checklist and/or LID checklist are resolved.Post-Construction Plan Review Checklist can be found on the web at: Plans for retaining walls, non-standard structures.Grading and/or improvements within utility R/W or in other easements shall require a letter of approval from the utility company.Grading and/or improvements within railroad R/W shall require a letter of approval from the railroad company.NCDENR Grading Permit (Required when government funds are used for projects. Examples: Hospital, Police Station, Fire Station, Utility Projects, Mecklenburg County, Towns, Parks, etc.)Aesthetics of utility structures in front of buildings. Locations of all utility structures (i.e. boxes, transformers, backflow preventors, etc.) are shown on the plans. All aesthetic concerns must be resolved prior to plan approval.For subdivision plans which only show grading of the roadway, the following note shall be added to the plans. Before any lots are denuded outside of the permitted area as shown on this approved set of plans, a revised plan must be submitted and approved by Mecklenburg County LUESA Land Development staff. Any lot development without a revision to the approved plan could result in immediate civil penalties being issued to both the developer and home builder.GOOSE CREEK WATERSHED (Site Specific Management Plan passed by NCDWQ as of 1/1/09)The undisturbed buffers required in the SSMP are 200’ for streams with a 100-yr floodplain and 100’ for all other streams/water bodies. These buffers are effective as of 1/1/09 and DO NOT have a development “trigger”. They are not currently shown in POLARIS. For further information, refer to the following website and “Charlotte-Mecklenburg Water Quality Buffer Implementation Guidelines”: AREA MAPSAll drainage area maps indicate project limits and are at a legible scale.Drainage area maps clearly and legibly depict onsite and off-site areas (colored coded maps encouraged).Maps are complete with properly labeled existing/proposed contours and indicate roof drainage direction.Off-Site topography for drainage basins must extend to a point where ridgelines can be clearly identified.Tc Travel Paths (pre/post) delineated on drainage area maps and labeled.Erosion Control Basin map delineate and label the drainage areas for each phase of construction.Storm drainage maps are labeled by inlet number and indicate acreage of drainage areas.Subdivision Drainage Areas are depicted in the plan set.Detention Basin maps show pre and post-development drainage areas and show SCS soil types.Ground cover (trees, grass, pavement, etc.) is depicted on the drainage area map.DRIVEWAYS AND NEW STREET ACCESSESDriveway Applications (with original signatures)4 original to NCDOT Newell Office (1 scanned copy submitted in EPM) 1 Town permit applicationsStreet NameNC Route/Road NumberTypical Section(s) with Pavement ScheduleWedging detail shown if required.Left-turn lanes are required for sites serving 50 or more residential lots, on roads with ≥ 4000 ADT, or site-specific for commercial property.Roadway cross-sections on the existing street being accessed, every 50’ for length of proposed widening (See NCDOT Cross-Section Guidelines). Include additional cross-sections 50’ before and after the widening.Overlay asphalt for entire width for NCDOT-maintained streets (or to the middle of the nearest full lane for Town-maintained streets). Overlay full width of road for symmetrical widening on an existing two-lane roadway.Traffic Control Plan that meets MUTCD and NCDOT and/or WATCH standards.Traffic Control Phasing and Traffic Control Notes. Pavement Marking Plan that meets MUTCD and NCDOT standards.Sight Distance Profile:Intersection sight distance based on AASHTO. Measured 15’ back from the travel lane.Plan and profile shall be shown for at least the distance of the profile in both directions.Driver eye height and object height is 3.5’ above existing/proposed road surface.Horizontal sight distance alignment: Lines of sight in both directions shall be shown and labeled.Vertical sight distance alignment: Show the centerline roadway profile of the existing street and the grades along the lines of sight. A minimum of 1’ shall be provided between the grade and line of sight.Include any potential conflicts. Sight triangle shall be clear of obstructions.Sight distance easements may be required if lines of sight cross adjacent properties (i.e. curves in roadway, limited frontage, etc.).Clear Zone Requirements per AASHTO Roadside Design Guide.Show all drive entrances to all properties along the existing street. Show all property lines.Right-of-way line and Controlled Access line, if present. Right-of-way must be verified by a Professional Land Surveyor.Right of way adequate for improvements. Right of way acquisition for proposed road improvements shall be acquired prior to plan approval.Driveway Std. # and widthCorner radii labeledDesign vehicle turning templatesWB 50 – All commercial drivesSU 30 – AlleysB-40 – Residential StreetP – Drive thrus, Parking DecksTapers for turn lanes per NCDOT Driveway Access manualExisting and proposed storm drainageParking Spaces per MCLDS 50.09 or Town OrdinanceTraffic Circulation within the project (Fire trucks, buses, etc.) Garbage collectionGRADING & EROSION CONTROL(See the North Carolina Erosion and Sediment Control Planning and Design Manual (NCESCPDM) and the Mecklenburg County Land Development Standards Manual [MCLDS], Mecklenburg County Soil Erosion and Sediment Control Ordinance and Policies and Procedures guidelines)Completed and notarized Financial Responsibility Form (if the financially responsible party is out of State, a North Carolina agent must be assigned).Copy of deed to prove ownershipConstruction sequence (suggested sequence – see LD Plan Notes Checklist)Denuded acres (outline denuded limits and list acreage)Undisturbed buffer areas – Dimensions and locations (grading in a buffer requires zoning approval)Swales, berms and temporary diversion ditches [MCLDS #30.05]Location of on-site and/or off-site waste burial areas; location of borrow sitesStabilized gravel construction entrance [MCLDS #30.11A]Silt fence (Used for sheet flow only) [MCLDS #30.06A-D] [NCESCPDM 6.62]Silt fence not installed across streams, ditches, or waterways, or other areas of concentrated flow.Only for small-disturbed areas that are less then ? acre per 100 ft of fence and <2% slope (for greater slopes, refer to NCESCPDM Table 6.62a)Not be used alone below graded slopes greater than 10 ft. in height (Only steel posts are to be used)10’ clearance is required between silt fence and the toe of any slope.Inlet protection provided at all structures. Block and gravel [MCLDS 30.07] and hardware cloth and gravel [MCLDS 30.09] must not be used near the edge of fill material and must not divert water over cut or fill slopes. Ensure that drainage areas do not exceed 1 acre per inlet.Slopes shall be graded no steeper than 2:1. Fill slopes greater than 10’ require adequate terracing [MCLDS #30.16, NCESCPDM 6.02]. Soils engineer to verify stability of slopes greater than 2:1. Sediment basins of any type shall not be placed in a road or other infrastructure that requires the basin to be removed prior to final stabilization.All proposed FES must discharge into a sediment control device or diverted to a basin until the drainage area is stabilized.All embankments must be constructed per Section 4.0.6 Embankment Requirements in the BMP Design Manual. (Town of Huntersville only: Soil compaction tests are required on berms ≥ 5’ in height from the natural grade. Soil compaction must be at 95% proctor and certified by a licensed soil engineer)Temporary Sediment Trap (for drainage areas <5 acres not within watershed protection areas) [MCLDS #30.01], [NCESCPDM 6.60]Do not locate basins in intermittent or perennial streams.Detail shown on plans with basin dimensions (top of berm, top of storage, bottom of storage, depth of storage) and the surface area at storage elevation.Label basin contours and tie into existing contours.Length to Width Ratio: Between 2:1 (min) and 6:1 (max)Depth: 3.5 ft min. (1.5 ft excavated below grade)Storage volume required and provided: Volume (cf) = Disturbed Area (Ac) x 3,600 cf Surface Area (SA) required and provided: SA (sf) = (Q10) x (435 sf)Design of spillway for 10-year storm (Dimensions and calculations) Length: 10 ft min.Baffles required: 3 min.Skimmer Sediment Basin (for drainage areas <10 acres) [MCLDS #30.02A], [NCESCPDM 6.64]Do not locate basins in intermittent or perennial streams.Detail shown on plans with basin dimensions (top of berm, top of storage, bottom of storage, depth of storage) and surface area provided at spillway.Label basin contours and tie into existing contours.Length to Width Ratio: Between 2:1 (min.) and 6:1 (max.)Depth: 2 ft min.Storage volume required and provided: Volume (cf) = Disturbed Area (Ac) x 1,800 cf Surface Area (SA) required and provided: SA (sf) = (Q10) x (325 sf)Design of emergency spillway for 10-year storm (Dimensions and calculations for permanent liner). Length: 10 ft min.1ft min. of bank freeboard above Q10 storm elevation (5’ max. dam height)Skimmer and orifice sized to dewater basin in 2-5 days (Follow NCESCPDM manual for this criteria)Detail of anti-seep collar and location. Collar must project 1.5’ min. from the barrel and be slightly downstream from the dam centerline.Baffles required: 3 min. If an outlet structure is used, include the design of concrete ballast pad: Safety Factor=1.1 min. (Provide calculations)Sediment Basin (For drainage areas ≥10 acres but <100 acres) [MCLDS #30.03], [NCESCDM 6.61]Do not locate basins in intermittent or perennial streams.Flashboard risers are not allowed.Detail shown on plans with basin dimensions (top of berm, top of storage, bottom of storage, depth of storage) and the surface area provided.Label basin contours and tie into existing contours.Length to Width Ratio: Between 2:1 (min.) and 6:1 (max.)Depth: 2 ft min.Side slopes: 2.5:1 min.Min. top width of dam (W): 8’ for fill height <10’, 10’ for fill height 10’-15’Storage volume required and provided: Volume (cf) = Disturbed Area (Ac) x 1,800 cf Surface Area (SA) required and provided: SA (sf) = (Q10) x (435 sf)Design of emergency spillway for 10-year storm (Dimensions and calculations) Length: 20 ft min.1ft minimum of bank freeboard above Q10 storm elevationSkimmer and orifice sized to dewater basin in 24-72 hrs (Follow NCESCPDM manual for this criteria). For extremely oversized basins, dewater basin in max. 5 days.Design of concrete ballast pad: Safety Factor = 1.1 minimum (Calculations)Detail of anti-seep collar and location. Collar must project 1.5’ min. from the barrel and be slightly downstream from the dam centerline. Design of riser and outlet pipe for 2-year storm (Calculations)Baffles required: 3 min.Sediment Basin with Rock Dam (for drainage areas <10 acres) [NCESCPDM 6.63]Detail shown on plans with basin dimensions (top of berm, top of storage, bottom of storage, depth of storage)Length to Width Ratio: Between 2:1 (min) and 6:1 (max)Depth: 3.5ft min. (1.5 ft excavated below grade)Storage volume required and provided: Volume (cf) = Disturbed Area (Ac) x 3,600 cfSurface Area (SA) required and provided: SA (sf) = (Q10) x (435 sf)Design of emergency spillway for 10-year storm (Dimensions and calculations) Length: 10 ft min.Max. flow depth of 6” above bottom of spillway with a min. of 1 ft of freeboard to top of damLabel basin contours and tie into existing contoursBaffles required: 3 min.Baffles [MCLDS #30.19], [NCESCPDM 6.65]Locations of each baffle shall be shown with dimensions on plans.The percent of surface area for each section of the baffle are as follows:Inlet zone: 35%Second cell: 25%First cell: 25%Outlet zone: 15%Basin designed and placed to allow periodic cleanout.Check Dam With Weir [NCESCPDM 6.87]The weir length is variable to the size of the drainage area and peak runoff. The weir length may be sized as follows: L(ft) = Q peak (cfs) 0.88The apron length (downside of weir) should be approximately three times the height of the dam with a minimum length of 4 ft.Gravel & Riprap Filter Berm Basin – Inlet Protection (for pipes ≤36” and drainage areas <5 ac.)[MCLDS #30.12], [NCESCDM 6.55]Detail shown on plansDo not install this measure in an intermittent or perennial stream.Provide 3600 cubic feet of sediment storage per acre of disturbed drainage area.Stone Inlet Protection (Temporary)”Rock Donut” [MCLDS #30.08], [NCESCDM 6.54]Maximum drainage area is 1 acrePlace measure at least 30 ft away from vehicular traffic.Creek Crossing – Creek shall be disturbed ONE time for the installation of the permanent crossing. Crossing of creek using temporary bridge mats (or similar type crossing) must be discussed with the Erosion Control Inspector. Slope Drains [MCLDS #30.04] [NCESCDM 6.32]Seeding schedule [MCLDS #30.17A,B] [NCESCDM 6.10, 11.1]Minimum 10’ clear zone from Top of Channel Bank to denuded limit.Wetland Protection measures (ex. 2 rows of silt fence separated with 6’-8’ between them)ENHANCED EROSION CONTROL MEASURESThese measures are required to be installed in the areas identified in Attachment 1.Surface water draw down devices (risers or skimmers) shall be installed in all sediment basins. Forebays shall be used in conjunction with all sediment basins. Rock forebay embankments may be used in lieu of porous baffles.Polyacrylamides (PAM) shall be used to reduce turbidity and suspended solids whenever a sediment trap, basin, pit, hole, or building foundation is being pumped out to remove sediment laden water. PAM is not required when any of the above is being pumped to an approved sediment basin on site. This activity must be inspected and approved by the Mecklenburg County erosion control inspector.Double silt fence shall be used along wetlands, streams, lakes or other surface water bodies as well as adjacent to all S.W.I.M. or other Water Quality Buffers. High hazard silt fence with wire backing and washed stone will be installed as determined necessary by the County Engineer or field inspector.The amount of uncovered area at any one time shall be limited to no more than 20 acres, unless approved by the County Engineering.A 10-foot undisturbed buffer shall be provided around the outside edge of drainage features such as intermittent and perennial streams, ponds, and wetlands. Incidental drainage improvements or repairs will be permitted within the buffer as approved by county staff.Installation of temporary ground cover or seeding must be performed within five (5) working days or slope drains installed after fill slopes are brought up to height.Permanent terraces shall be installed on 2:1 or steeper slopes over 19 feet in height to reduce runoff velocity coming down the slopes.STORM DRAINAGE (Refer to Storm Water Design Manual [SWDM] Chapters 3-8)All design in accordance with the MCLDS and SWDM.Provide details of all drainage structures or refer to MCLDS.Location, size, invert and rim or grate elevations and pipe material for existing and proposed storm drains and culverts on and immediately adjacent to the site.Storm system pipes designed for 10-year storm [SWDM 3.5.1]Where roadway overtopping is anticipated, drainage that is picked up in a culvert (or other drainage structure) prior to crossing the road must be conveyed in a system designed for the 25-year storm (50-year storm for thoroughfares). Flow calculations must be based on the appropriate design storm to the end of the system or to a relief point lower than the street elevation.Discharge leaves site in same direction and relative location as pre-developed condition.Structures or flared end sections at all inlets and outlets of all pipe systems other than small outlets to rain gardens. (CMP and HDPE FES are NOT allowed) [SWDM 6.5.9]Non-standard drainage structures (CBs, DIs, MHs, JBs, HWs, FESs, bottomless culverts, etc.) will require sealed construction drawings.Minimum 2' cover on pipes (on Class III RCP, 1’ minimum cover on Class IV RCP).The minimum allowable slope is 0.5 percent, or the slope which will produce a velocity of 2.5 fps when the storm water in system is flowing full, whichever is greater. [SWDM 5.9.6] Maximum velocity in pipes 20 fps (10 fps for CMP) [SWDM 5.9.2 & 6.5.4]Maximum discharge velocity at pipe outlets is 5 fps (or the original velocity prior to development) [SWDM 6.5.4]Rip rap required for all pipe outfalls (0% slope, Min. L=10’, Min. Depth=10”). Filter fabric must be placed underneath. [MCLDS #20.23]Corrugated metal pipes must be aluminum or aluminized steel.Maximum of one (1) acre runoff draining into the street at one point.No concentrated runoff flowing over City/County sidewalks except at driveway entrances.Maximum spread of 6 feet (or half a travel lane) on public streets based on rainfall intensity of 4 in/hr [SWDM 1.3]. An additional 1 ft is allowed for valley curb and 1’-6” curb and gutter, and 2 ft for 2’-6” curb and gutter.Slope less than 2% across intersections may need additional CBs and spot elevations to prevent intersection flooding.Catch Basin placement at intersections [MCLDS #10.30]Check drainage at stub streets (i.e. spread, future culvert crossings, and 100+1 culvert analysis)Crossdrains/Culverts must meet the following criteria: Culverts – Minimum diameter of 18”100-yr storm does not exceed 6” over the roadCross-drainage on thoroughfare classified roadways – 50-yr storm (25-yr storm for minor roadways)12” freeboard for culverts ? 3’ in diameter (25-yr storm)18” for all culverts > 3’ in diameter (25-yr storm)Maximum ponding at yard inlets is 1’ with 6” freeboard for design stormHW/D ? 1.2Check applicability of Culvert Crossing [MCLDS #10.36A & 10.36B]Standard Headwall detail is referenced or design sealed by EngineerFor bottomless culverts, upstream and downstream footer elevations shownExisting creek/channel typical sectionRoadway cross-section at culvert crossing @ legible scalePipes in R/W 48” or less in diameter may be HDPE or RCP, >48” may be RCP, >60” may be aluminized steel; minimum 15” (any HDPE pipe used within one of towns shall have the public works approval and bedding material and 3rd party certified).Provide details of curb cuts and flumes.Properly sized and labeled Storm Drainage Easements (SDE) [MCLDS #20.30]. Specify who will maintain these easements. Storm Drainage Easements must extend down stream of flared end sections to an appropriate property line or buffer. Overlapping of storm drain easements shall be approved by the County Engineer.CHANNEL DESIGN (Refer to Storm Water Design Manual Chapter 4)Channel cross-sections and calculationsMax. 2:1 side slopes [SWDM 4.3.1]Designed for 10-yr stormMin. 6” freeboardThe final design of artificial open channels should be consistent with the velocity and shear strength limitations for the selected lining [SWDM 4.3.4]Liner specifications and design information from manufacturer.Transition to channel sections with a minimum of 5:1 taper [SWDM 4.3.1]Channels with bottom widths > 10' must have a minimum bottom cross slope of 12:1 [SWDM 4.3.1]Properly sized and labeled storm drainage easement (SDE) [MCLDS #20.30]Driveway pipes sized for Q10, check for roadway overtopping as required.100+1 FLOOD ANALYSIS [Q100>50 cfs]For pipe systems not designed for Q100 that receives >50 cfs in Q100, flood protection analysis is required.Flood study calculations shall be sealed by PE. Calculations for flow and tc Runoff coefficients shall be based on assumption of full development of parcels per current zoning.Include digital copy of channel analysis input file in submittal (e-mail or CD-R acceptable).Proposed FPE/SWPE (based on jurisdiction) shall be labeled on site and grading plan for each lot.Show and label location of 100+1 Building Restriction Floodline/Storm Water Elevation Line (based on jurisdiction) on site and grading plan.Minimum 1,200 sf of buildable area per lot. Show or describe on plans the location and elevation (ref. vertical datum, i.e. NAVD 88) of permanent benchmark used in channel survey. All topographic information shown on grading plans shall also be referenced to this benchmark. All flood studies shall be done using the NAVD 88 datum.Existing channel cross-section geometry used in analysis shall be based on a “Class A” field survey and shall be sealed by RLS.When fill is proposed within the 100+1 Building Restriction Floodline, plotted channel cross-sections shall be included in the subdivision plan set and shall show both existing and proposed cross-section geometry. Sheets to be signed by RLS for existing and PE for proposed conditions.When no grading is proposed within the 100+1 Building Restriction Floodline, it is not necessary to include plotted cross-sections in the subdivision plan set. A note shall be added to the grading plan specifying that there shall be no grading within the limits of the 100+1 Building Restriction Floodline.Cross-sections taken perpendicular to the stream centerline, maximum 100’ stationsPlot cross-sections showing the 100+1 elevation on site and grading plan.Cross-sections based on topographic map are subject to approval of the Review Engineer.Minimum of 5 cross-sections provided downstream of culvert (additional cross-sections may be required to determine the correct water surface elevation).Contraction and expansion coefficients (0.6, 0.8) applied at 1.5:1 from the edge of pipe to the existing bank.Ineffective flow is applied in correct locations based on 1.5:1 and bank geometry.In case of a bridge or culvert:Cross-sections should be prepared at 5 feet from inlet and 5 feet from outlet Road profile at culvert crossing to an elevation 2 feet above the low point of roadA physical description of the culvert (type, shape, invert, etc.)* Upstream and downstream top of footer elevations for natural bottom culvertsFlood Protection Elevations (FPE)/Storm Water Protection Elevation (SWPE) (depending on jurisdiction) for lots upstream of street crossings shall be based on the higher of the elevation determined by analysis or the low point of the road plus 1 foot.Maximum height of flow over a street is 6”.FLOODWAY [Drainage Area > 640 Acres]Show and label Creek name and centerline along full extent of project.Floodway Cross-sections – Label the cross-section ID, FEMA Flood Fringe Elevation and the Future Conditions Flood Fringe Elevation.Label the following lines clearly on grading and site plan:Community Flood Fringe LineFEMA Flood Fringe LineCommunity Encroachment Line FEMA Floodway Encroachment LineFlood Protection Elevations/Storm Water Protection Elevation (FPE/SWPE) for all lots that touch the Community Special Flood Hazard Area. FPE/SWPE must be based on the Community Base Flood Elevation plus applicable freeboard for the project’s jurisdiction. Note on plans: The Community Encroachment Line must be clearly marked prior to any grading and the marked line must be maintained on site until final grading is completed. Contact David Love at (704) 432-0006 concerning Floodplain Development Permit if grading within a Community Special Flood Hazard Area. Approval required prior to plan approval.DETENTION [Refer to Storm Water Design Manual - Chapter 7], {Post Construction requirements may differ from the below requirements, refer to Post Construction Administration Manual if applicable} For designs using HydroCad, all electronic files are to be provided for review. For all other programs, the designer is to submit a storm water summary sheet for each watershed.Design for release rate of pre-developed 2-yr & 10-yr storm (6hr or 24hr storm) [SWDM 7.3.2]Routing calculations are required for storage volume and emergency spillway (sealed) [SWDM 7.3.3]The same hydrologic procedure shall be used to determine pre- and post-development hydrology.Design Calculations must include:Calculations for pre & post-development weighted runoff coefficientsCoefficients shall be specified and justified. Soil survey showing soil type shall be included. Good condition shall be used.Time of concentration calculations (use SCS method) [SWDM 3.9.6.1]Time of concentration travel path (clearly label segments on contoured drainage area map)Inflow hydrograph for all design storms for fully developed and pre-developed conditions [See Chapter 3 of SWDM for approved inflow hydrographs]Stage-storage table for proposed storage facilities.Stage-discharge table for all outlet control structures.Undetained runoff must be accounted for in calculations.All detention volume shall be drained within 72 hours.Emergency spillways for ponds shall be designed to pass the 50-yr storm [SWDM 7.3.2] (Lined in fill areas)Maximum 6”depth of storage in code-required parking areas, 10”in additional parking areas, 15” storage allowed in truck storage and loading areas (depth based on 10-yr storm). [SWDM 7.3.3]Limits of 10 yr detention storage elevation in parking lots labeled. Maximum slope on basins of 2:1 [SWDM 7.3.4]Minimum 6” freeboard above 50-year elevation on earthen basins (on basins less than 15' deep) [SWDM 7.3.4]Any orifice smaller than 4” in diameter must have a trash rack. Provide detail. [SWDM 7.5.6]. Locate & label on site plan the elevation of dam with dimensions and spot elevations.Locate & label on site plan the location of primary and emergency outlets.Provide detail of outlet restrictive device.2-yr and 10-yr 6 hour storm, good pre-developed condition must be used when applying for Storm Water fee credit.No utilities or habitable structures within impoundment areas.Detention facilities are not allowed within required buffers. [Zoning Ordinance 12.302]Detention facilities are not allowed within the existing or proposed R/W. [Zoning Ord. 12.103]Underground Detention systemsAll pipes must maintain a minimum 0.5% slope.All pipe network nodes labeled with spot elevations.Adequate access for maintenance at control structures (cleanouts).Upper reaches of system provided with access points and proper ventilation.Discharge point for 50-year storm is evaluated.Regional Detention Basins Drainage Area map with clear delineation of parcels served.Pipe systems/channels from site to regional facility/floodway sized for 10-yr storm water runoff.Permanent Detention Easements labeled on plans. [MCLDS #20.30]Off-site detention requires Permanent Detention Easement recorded at Mecklenburg County’s Register of Deeds. (Easements must be reviewed by Mecklenburg County LUESA)BMP Design (refer to current Charlotte-Mecklenburg BMP Design Manual)SWIM STREAM BUFFERSBuffer widths are shown and labeled on plans and are correct based on POLARIS.Plans indicate that all engineered channels, piped outfalls, and rip rap aprons end outside of the buffer.Drainage outfalls must be designed to allow water to sheet flow across the buffer to filter out pollutants.Energy dissipators, diversion devices or wetland flow must be used to spread concentrated flows and must be located outside the buffer area. Adequate vegetative cover must be retained or re-established below energy dissipators to prevent erosion.No outlet drains more than 10 acres drainage area to any one point in a stream buffer.Where disturbance to the buffer is shown, a letter from Water Quality is required stating that the disturbance shown is allowable or whether a mitigation plan has been approved.All temporary sediment basins and all other erosion control devices are located outside of the minimum buffer width.Plans clearly indicate that NO fill material is to be brought into the buffer and that no structures are allowed within any of the buffer areas (except non-commercial out buildings not exceeding 150 square feet).Buffer DelineationBuffer area is clearly identified on plans in bold, clear type as “S.W.I.M. STREAM BUFFER”.The outside boundary of each buffer zone is clearly marked and labeled on plans (stream side, managed use, upland).Field located top of bank from where the buffer width is measured is labeled on plans.The outside boundary of the buffer must be permanently marked with an iron pin or other acceptable. property corner marker at all street crossings. The iron must be called out on the plans.Show orange fabric fencing on Grading and Erosion Control Plans.Streams and buffer boundaries including the delineation of each zone and a dimension from a specific location are shown on all surveys and record plats, including individual record plats for any lots affected.Where applicable for 100’ buffers/50% additional width: Provide calculations for 50% additional width based on the area between the current 100-year FEMA FRINGE BOUNDARY to the 100’ SWIM Buffer or the 0.1 FLUM Encroachment line, whichever is less.IMPROVEMENTS TO EXISTING RIGHT-OF-WAYOffsite R/W requirements shown on plans (for symmetrical widening, off-site frontage improvement tie-ins, etc.).Need R/W agreement (recorded) for road widening and/or improvements where there is no existing R/WStorm drainage associated with street improvements.Show and label cross-section and profile of existing street with proposed improvements (i.e. curb and gutter, sidewalk, pavement section, ditch cross-section, associated drainage, etc.).If the existing street is maintained by NCDOT, a NCDOT Encroachment Agreement is required for the proposed improvements (contact NCDOT, 980-523-0000).Bicycle improvements along roadway may be required (check Bikeway Improvement Plan map or Town Ordinance).Rezoning petition could list requirements for additional or non-standard right-of-way improvements. Copy of rezoning petition shall be included in the plans.As of 4/8/09, the increase in impervious area due to widening of existing roads MUST be included in the BUA and MUST be included in the sizing of the development’s BMPs.On-street parking dimensions meets MCLDS 50.09 and/or Town Ordinance.Design exceptions accepted by the Town must be noted on the plans.When a proposed street ties into an existing street (classified below), street improvements may be required:ArterialsCommercial ArterialsCollectorsCommercial CollectorsProperty Frontage TypicalMCLDS# 11.09MCLDS# 11.09MCLDS# 11.06MCLDS #11.11, 11.12Right-of-way widthMajor: 100’*Minor: 70’*100’ Dedicated50’ ReservedSee TownSee TownCurb & gutter (MCLDS#10.17)2’6”2’6”2’6” OR2’0”2’6”C/G Turn out from CL to F/C24’ (to locate sidewalk)24’ (to locate sidewalk)17’20’Sidewalk, Planting StripSee TownSee TownSee TownSee TownMinimum Shoulder8’ (6’ for NC-maintained)8’ (6’ for NC-maintained)8’8’Recommended Taper100’100’50’50’R/W widths different for urban arterials (see MUMPO Thoroughfare Map)PUBLIC STREETS Typical sections must conform to MCLDS standardsAccessible ramps required at all intersections. [MCLDS # 10.31 thru 10.35]Taper from local to local-limited. [MCLDS #10.37]Bicycle improvements along roadway may be requiredAASHTO sight triangles at intersections CUL-DE-SACSResidential [MCLDS # 11.16] with appropriate pavement radius?Commercial [MCLDS # 11.17]Provide spot elevations along lip of cul-de-sac to insure positive drainage for profiles ≤ 2%? 42' recommended to allow for emergency vehicles turning with minimal reverse movement. R/W must be adjusted to accommodate larger pavement radius.PRIVATE STREETS and ALLEYSMaximum grade 10%Minimum horizontal radius at CL determined by design vehicleShow limits of private streetVertical curve K-values (crest/sag 10/20)Typical section per MCLDS #11.13Residential alley details per MCLDS #11.19AASHTO sight triangles at intersections with a public streetParking bays allowed on only one side of the street unless a median is providedHORIZONTAL AND VERTICAL REQUIREMENTSUse of level or hilly terrain criteria not permitted without prior approval of the Review EngineerTerrain Classification -Slope Range (%)Level (0-8)Rolling (8-15)Hilly (15+)Minimum SightLocalSee AASHTODistanceCollectorSee AASHTOMaximum Grade (%)Local61012Collector4810Minimum Grade (%)All0.50.50.5Minimum Radius (ft) Local250See Town90Collector350See Town175K Values (Crest/Sag) Local28/3520/2015/20Collector40/4528/3520/20Minimum tangentLocal505050between Horizontal curvesCollector100100100(NO REVERSE CURVES)Show profiles with vertical data and storm drainage for all proposed streets (Public and Private).Provide horizontal curve data (Public and Private).Profiles for streets to be barricaded must extend 300 feet beyond the phase/property line or to the proposed future end of the street, whichever is less. [MCLDS #50.07, 50.08]Nonsymmetrical vertical curves must have L1 or L2 ? one-third of total length.Thoroughfares – refer to AASHTO "A Policy on Geometric Design of Highways and Streets"INTERSECTIONSTerrain Classification-Slope Range (%)Level (0-8)Rolling (8-15)Hilly (15+)Clear sight distance (ft.)See AASHTOVertical alignment (max) within 100' (%)5Minimum angle of intersection (?)757575Minimum curb andLocal20See Town20R/W radiusCollector30See Town30Minimum offset to adjacentLocal125125125intersection (ft)Collector200200200FIRE DEPARTMENT ACCESS REQUIREMENTSFire apparatus shall access within 150 feet of all exterior walls. (NC Fire Code 503.1.1)Dead-end fire access roads in excess of 150 feet in length shall be provided with an approved area for turning around fire apparatus. (NC Fire Code 503.2.5)Fire apparatus access roads shall have an unobstructed width of not less than 20 feet (measured from FOC to FOC) and an unobstructed vertical clearance of not less than 13 feet 6 inches. (NC Fire Code 503.2.1)Turning radii required is 42 feet outside and 30 feet inside. (NC Fire Code 503.2.4)Fire apparatus access roads shall be designed and maintained to support the imposed loads of fire apparatus (80,000 lbs) and shall be surfaced so as to provide all-weather driving capabilities. (NC Fire Code 503.2.3)Multifamily buildings – Emergency ladder access shall be provided from a finished grade that is no more than 15% maximum slope for a distance of 12 feetBuildings over 3 stories must have frontal clearance for rescuesBuilding Code – Minimum 20’ separation between buildings (measured to/from eaves) or firewallsUtility plans must show location of fire hydrants, water lines, and size of water lineFire hydrant required within 750 feet of most remote point of building as the truck travelsFire hydrant required within 200 feet of fire department connection of all sprinklered commercial structures and 750 feet to residential sprinklered structuresSix-inch dead end water mains serving a hydrant may not exceed 350 feet ................
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