§ 15. ADMINISTRATIVE GUIDELINES AND CHECKLISTS  


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    MINOR LAND DISTURBANCE CHECKLIST

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    Plan Requirements
    _____ 1. Project name and address, land lot, district, and zoning district.
    _____ 2. Owner's name and complete address including zip code.
    _____ 3. Name and telephone number of a "24-Hour Contact".
    _____ 4. Design firm name/address/phone, point of contact, and contact phone number.
    _____ 5. North arrow, site acreage, and scale of drawing (1"=10 to 1"=50').
    _____ 6. Boundary information including bearings and distances along all property lines, and Tie.
    _____ 7. Street name and right-of-way width.
    _____ 8. Building setback lines (per Sandy Springs Zoning Ordinance) labeled with dimensions to lot lines.
    _____ 9. Locations of all existing structures (including houses, barns, sheds, landscape and retaining walls, sanitary and storm drainage lines and structures, detention ponds and structures, septic tanks and lines, pools, fences, etc.) with distances to lot lines for all above ground structures.
    _____ 10. Locations of all proposed structures (including houses, walls, sanitary and storm drainage lines and structures, septic tanks and lines, pools, fences, etc.). Size and type of construction should be called out on the plan with distances to lot lines for all above ground structures.
    _____ 11. Height of proposed buildings and square footage of existing and proposed dwelling.
    _____ 12. Location of zoning buffers, access easements, sewer easements, and drainage easements, etc.
    _____ 13. Location of all proposed parking spaces. Include calculations, dimensions of spaces and drives, include Handicap spaces and compact, if any.
    Erosion Control Requirements (only if required)
    _____ 1. Complete the GSWCC Erosion and Sediment Control Plan Review Checklist and submit with plans. Indicate on the completed checklist if each checklist item is included and on what plan page(s) each item is depicted. Sign and date checklist.
    _____ 2. Add the following notes to the plans:
    A. Prior to any other construction, a stabilized construction entrance shall be constructed at each entry to or exit from the site.
    B. The construction exits shall be maintained in a condition which will prevent tracking or flow of mud on to public right-of-way. This may require periodic top dressing with stone, as conditions demand, and repair and/or clean-out of any structures used to trap sediment. All materials spilled, dropped, washed, or tracked from vehicle onto public roadway or into storm drain must be removed.
    C. Prior to commencing land disturbance activity the limits of land disturbance shall be clearly and accurately demarcated with stakes, ribbons, or other appropriate means. The location and extent of all authorized land disturbance shall occur within the approved limits indicated on the approved plans.
    D. Immediately after the establishment of construction entrances/exits, all perimeter erosion control devices and storm water management devices shall be installed prior to any other construction.
    E. Owner agrees to provide and maintain off-street parking on the subject property during the entire construction period.
    F. The contractor shall furnish and maintain all necessary barricades while roadway frontage improvements are being made.
    G. The construction of the site will initiate with the installation of erosion control measures sufficient to control sediment deposits and erosion. All sediment control will be maintained until all up stream ground within the construction area has been completely stabilized with permanent vegetation and all roads/driveways have been paved.
    H. Failure to install, operate or maintain all erosion control measures will result in all construction being stopped on the job site until such measures are corrected back to City of Sandy Springs Standards.
    I. A copy of the approved land disturbance plan and permit shall be present on the site whenever land disturbance activity is in progress.
    J. All sewer easements disturbed must be dressed and grassed to control erosion.
    _____ 3. Delineate a 50 foot undisturbed natural vegetative buffer, measured horizontally, on both banks of the stream as measured from the point of wrested vegetation in accordance with the Sandy Springs Stream Buffer Protection Ordinance. No septic facilities permitted within the buffer.
    _____ 4. Delineate a 25 foot impervious setback, measured horizontally, beyond the 50 foot undisturbed natural vegetative buffer, in which all impervious cover is prohibited. Grading, filling, and earthmoving shall be minimized within the setback. (Ref: City of Sandy Springs Stream Buffer Protection Ordinance) No septic facilities permitted within the setback.
    _____ 5. Site is within 2000 feet of the banks of the Chattahoochee River. Demonstrate compliance with the Metropolitan River Protection Act and the Chattahoochee Corridor Plan.
    _____ 6. Per Sandy Springs Zoning Ordinances 34.4.1.G.7, siltation study may be required.
    _____ 7. Provide statement on the plans stating whether State Waters are or are not onsite or within 200 feet of the site. If State Waters are within 200 feet of the site depict location of State Waters.
    GRADING ONLY PROJECTS
    _____ 1. Provide a cash surety for the completion of re-vegetation and site stabilization per Worksheet 1 below.
    _____ 2. Show the following notes:
    A. A performance surety for grading, erosion control, re-vegetation and site stabilization will be required in the amount of $ ____________ .
    B. The surety shall remain in force and be renewable from phase to phase.
    C. The Contractor shall provide traffic control by posting signalmen and clean-up crews for the duration of hauling.
    D. All traffic control and clean-up crew operations shall conform to the Manual of Uniform Traffic Control Devices.
    E. Hauling operations shall not be permitted during peak traffic flow periods: 7 - 9 am and 4 - 6 pm.
    F. Contractor shall be responsible for repair of any damage to roadway caused by hauling operations. Existing conditions shall be documented in engineer's biweekly report.

     

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    MAJOR LAND DISTURBANCE CHECKLIST

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    Plan Requirements
    _____ 1. Project name and address, land lot, district, and zoning district.
    _____ 2. Owner's name and complete address including zip code.
    _____ 3. Name and telephone number of a "24-Hour Contact".
    _____ 4. Design firm name/address/phone, point of contact, and contact phone number.
    _____ 5. North arrow, site acreage, and scale of drawing (1"=10 to T-50').
    _____ 6. Boundary information including bearings and distances along all property lines, and Tie.
    _____ 7. Street name and right-of-way width.
    _____ 8. Building setback lines (per Sandy Springs Zoning Ordinance) labeled with dimensions to lot lines.
    _____ 9. Locations of all existing structures (including houses, barns, sheds, landscape and retaining walls, sanitary and storm drainage lines and structures, detention ponds and structures, septic tanks and lines, pools, fences, etc.) with distances to lot lines for all above ground structures.
    _____ 10. Locations of all proposed structures (including houses, walls, sanitary and storm drainage lines and structures, septic tanks and lines, pools, fences, etc.). Size and type of construction should be called out on the plan with distances to lot lines for all above ground structures.
    _____ 11. Height of proposed buildings and square footage of existing and proposed dwelling.
    _____ 12. Location of zoning buffers, access easements, sewer easements, and drainage easements, etc.
    _____ 13. Location of all proposed parking spaces. Include calculations, dimensions of spaces and drives, include Handicap spaces and compact, if any.
    Drainage Requirements
    Address All Items Marked With an "X"
    _____ 1. Minimum culvert size shall be 18", and maximum velocity shall be 15 ft. /sec.
    _____ 2. Locate catch basins with 600 feet maximum spacing, designed for 10-year storm with a Maximum gutter spread of 8 feet.
    _____ 3. Show nearest existing catch basin along all roads that receive water from this development.
    _____ 4. Provide design calculations for all storm drainage pipes. Storm drainage pipes shall be designed for 25-year storm frequency.
    _____ 5. Culverts beneath roads shall be designed to convey the 100-year storm. Show analysis/effects of 100 year storm.
    _____ 6. Provide design calculations for all ditches and channels. Ditches and channels shall be designed for 25-year storm frequency.
    _____ 7. Provide back water effect due to constriction of pipes in ditches or swales. Limit backwater to within the property.
    Storm Drainage Plan
    _____ 8. Show existing and proposed contours, clearly distinguishable.
    _____ 9. Identify drainage structures as existing or proposed.
    _____ 10. Show drainage easements drawn with width dimensions specified. Typical D.E. width is 20 ft minimum.
    _____ 11. Delineate and label any flood zone within the site.
    _____ 12. Label roadway highpoints on the center line of the roadway.
    _____ 13. Show the limits of proposed construction to be permitted.
    _____ 14. Profile all existing/proposed storm pipes above which land disturbance will occur.
    _____ 15. Reference all storm drainage structures (i.e., catch basins, drop inlets, headwalls, etc.) to Sandy Springs or any other standard (G.D.O.T., etc.) or provide complete detail(s) if not a public standard.
    _____ 16. Storm drainage structures are not allowed within the radius of a curb.
    _____ 17. Provide outlet velocity at outlet structures, (i.e. storm drainage profile).
    _____ 18. Storm drainage structures shall discharge into natural draws or drainage channels/swales.
    _____ 19. For all permit revisions, submit a letter stating the proposed changes. These changes should be highlighted on all sheets affected.
    Storm Drainage Pipe Design
    _____ 20. 30" maximum cross drain pipe draining through Sandy Springs standard catch basins or drop inlets. When larger diameter is required, provide design and detail of all structures.
    _____ 21. Storm drain cross section:
    A. Minimum pipe cover
    1. Storm drains: 18 inches outside roadway, 36 inches within roadway (See standard 600).
    2. Berming or trenching is not allowed to achieve minimum or maximum cover.
    B. Minimum pipe slopes:
    1. Concrete or smooth walled HDPE 0.5%
    2. CMP 1.0%
    _____ 22. All storm crossings under roadways shall be reinforced concrete pipe, class per Standard 573.
    _____ 23. Storm pipe material types, directional changes, slope changes or transitions are permitted only at drainage structure with surface access (i.e., junction box with manhole, catch basin, etc.)
    Concrete collars are not acceptable at transitions.
    _____ 24. Show size, material type, class or gauge, percent slope, and length of all pipes.
    _____ 25. Provide invert elevations and top elevations of drainage structures.
    _____ 26. Anchor collars are required on storm pipes when the slope is greater than 30%.
    _____ 27. Cite Standard 573 for storm sewer pipes (C.M.P. pipe shall be half coated with a paved invert.)
    Ditches and Swales
    _____ 28. All proposed swales and ditches shall have cross sections, centerline profiles, flow volumes, and velocities shown on plans.
    _____ 29. If velocity in ditch is greater than 3 ft. /sec., ditch shall be paved with a non-erodible material.
    Storm Drain Structures
    _____ 30. Show drainage area, Q25 and headwater elevation at the inlet of all storm drain structures
    (include accumulative areas and Q's, and longitudinal system).
    _____ 31. Indicate the type and Fulton County standard number (or other) for inlet and outlet structures of all pipes.
    _____ 32. All pre-cast M.H. shall be provided with a minimum of 9 inches clearance on each side ofconnecting pipe between all cut-outs or penetration.
    _____ 33. Use online catch basins except for cul-de-sac applications in which one foot offset is required.
    _____ 34. Show concrete spillway at the end of curb and gutter (as per G.D.O.T. Standard 9013, type III) where applicable.
    _____ 35. Use concrete flared end sections at driveway crossings within the right-of-way and other Applications adjacent to vehicular traffic (Ref. G.D.O.T. Standard 1120).
    _____ 36. Professional's seal and signature required on all plans and reports.
    Erosion Control Requirements
    _____ 1. Complete the GSWCC Erosion and Sediment Control Plan Review Checklist and submit with plans. Indicate on the completed checklist if each checklist item is included and on what plan page(s) each item is depicted. Sign and date checklist.
    _____ 2. Add the following notes to the plans:
    A. Prior to any other construction, a stabilized construction entrance shall be constructed at each entry to or exit from the site.
    B. The construction exits shall be maintained in a condition which will prevent tracking or flow of mud on to public right-of-way. This may require periodic top dressing with stone, as conditions demand, and repair and/or clean-out of any structures used to trap sediment. All materials spilled, dropped, washed, or tracked from vehicle onto public roadway or into storm drain must be removed.
    C. Prior to commencing land disturbance activity the limits of land disturbance shall be clearly and accurately demarcated with stakes, ribbons, or other appropriate means. The location and extent of all authorized land disturbance shall occur within the approved limits indicated on the approved plans.
    D. Immediately after the establishment of construction entrances/exits, all perimeter erosion control devices and storm water management devices shall be installed prior to any other construction.
    E. Owner agrees to provide and maintain off-street parking on the subject property during the entire construction period.
    F. The contractor shall furnish and maintain all necessary barricades while roadway frontage improvements are being made.
    G. The construction of the site will initiate with the installation of erosion control measures sufficient to control sediment deposits and erosion. All sediment control will be maintained until all up stream ground within the construction area has been completely stabilized with permanent vegetation and all roads/driveways have been paved.
    H. Failure to install, operate or maintain all erosion control measures will result in all construction being stopped on the job site until such measures are corrected back to City of Sandy Springs Standards.
    I. A copy of the approved land disturbance plan and permit shall be present on the site whenever land disturbance activity is in progress.
    J. All sewer easements disturbed must be dressed and grassed to control erosion.
    _____ 3. Delineate a 50 foot undisturbed natural vegetative buffer, measured horizontally, on both banks of the stream as measured from the point of wrested vegetation in accordance with the Sandy Springs Stream Buffer Protection Ordinance. No septic facilities permitted within the buffer.
    _____ 4. Delineate a 25 foot impervious setback, measured horizontally, beyond the 50 foot undisturbed natural vegetative buffer, in which all impervious cover is prohibited. Grading, filling, and earthmoving shall be minimized within the setback. (Ref: City of Sandy Springs Stream Buffer Protection Ordinance) No septic facilities permitted within the setback.
    _____ 5. Site is within 2000 feet of the banks of the Chattahoochee River. Demonstrate compliance with the Metropolitan River Protection Act and the Chattahoochee Corridor Plan.
    _____ 6. Per Sandy Springs Zoning Ordinances 34.4.1.G.7, siltation study may be required.
    _____ 7. Provide statement on the plans stating whether State Waters are or are not onsite or within 200 feet of the site. If State Waters are within 200 feet of the site depict location of State Waters.
    GRADING ONLY PROJECTS
    _____ 1. Provide a cash surety for the completion of re-vegetation and site stabilization per Worksheet 1 below.
    _____ 2. Show the following notes:
    A. A performance surety for grading, erosion control, re-vegetation and site stabilization will be required in the amount of $ ____________ .
    B. The surety shall remain in force and be renewable from phase to phase.
    C. The Contractor shall provide traffic control by posting signalmen and clean-up crews for the duration of hauling.
    D. All traffic control and clean-up crew operations shall conform to the Manual of Uniform Traffic Control Devices.
    E. Hauling operations shall not be permitted during peak traffic flow periods: 7—9 am and 4—6 pm.
    F. Contractor shall be responsible for repair of any damage to roadway caused by hauling operations. Existing conditions, shall be documented in engineer's biweekly report.
    Storm Water Management Report Requirements
    Minimum Submittal Requirements
    1. Conceptual Review Approval
    2. Stormwater Management Report/Hydrologic Analysis (2 copies).
    3. Construction Plans bearing details of all stormwater management facilities and plans and profiles of proposed storm sewer.

     

    Stormwater Management Report Contents

    1.

    Existing Conditions Analysis

    A.

    Provide topographic map of existing conditions. Show the following on the map:

    i.

    Delineate drainage boundaries (including offsite areas draining onto site) and label/name each drainage area the same as each basin is labeled/named in calculations and tabulations appearing elsewhere in the report.

    ii.

    Indicate acreage of each delineated drainage area.

    iii.

    Indicate CN for each delineated drainage area.

    iv.

    Indicate t c for each delineated drainage area.

    v.

    Indicate runoff travel path and correlate to calculations determining t c for each drainage area.

    vi.

    Indicate land cover condition for each drainage area.

    B.

    Provide a summary table of peak rates of runoff from each delineated drainage area for 1, 2, 5, 10, 25, and 100 year storm events. Include in summary table for each drainage area the following data: label/name of drainage area, acreage, CN , t c , gross rainfall amount for each storm event, and peak flow rate for each storm event (cfs).

    C.

    Provide time of concentration determination calculations for each drainage area.

    2.

    Post Development Conditions Analysis

    A.

    Provide topographic map of developed conditions. Show the following on the map:

    i.

    Delineate drainage boundaries (including offsite areas draining onto site) and label/name each drainage area the same as each basin is labeled/named in calculations and tabulations appearing elsewhere in the report.

    ii.

    Indicate acreage of each delineated drainage area.

    iii.

    Indicate CN for each delineated drainage area.

    iv.

    Indicate t c for each delineated drainage area.

    v.

    Indicate runoff travel path and correlate to calculations determining t c for each drainage area.

    vi.

    Indicate land cover condition for each drainage area.

    vii.

    Delineate and label/name each stormwater management facility.

    viii.

    Indicate all outflow locations for each stormwater management facility.

    B.

    Provide a summary table of peak rates of runoff from each delineated drainage area for 1, 2, 5, 10, 25, and 100 year storm events. Include in summary table for each drainage area the following data: label/name of drainage area, acreage, CN, t c , gross rainfall amount for each storm event, and peak flow rate for each storm event (cfs).

    C.

    Provide a summary table of developed peak rates of runoff vs. existing peak rates of runoff for each drainage area. Demonstrate no increase in peak rates of runoff for 1, 2, 5, 10, or 25 year events for each drainage area.

    D.

    Provide tabular hydrograph output for drainage area(s) draining to each stormwater management facility for the 1,2, 5, 10, 25, and 100 year events.

    E.

    Provide tabular hydrograph output for outflow (routing) of each stormwater management facility for the 1,2,5,10, 25, and 100 year events.

    F.

    For any bypass area hydrograph that is combined with a stormwater management facility outflow hydrograph, provide the tabular hydrograph output for the bypass area for the 1, 2, 5, 10, 25, and 100 year events. Provide the tabular hydrograph output for each combined hydrograph.

    G.

    Provide time of concentration determination calculations for each drainage area.

    H.

    For each stormwater management facility provide Stage/Storage/Outflow tabulation and outlet configuration data used for routing for each stormwater management facility.

    I.

    Provide Water Quality Volume (WQv) calculations in accordance with the Georgia Stormwater Management Manual (GSMM).

    J.

    Provide Channel Protection Volume (CPv) calculations in accordance with the Georgia Stormwater Management Manual (GSMM).

    K.

    Provide extended detention orifice sizing calculation.

    L.

    Provide details for outlet control structures/devices for each stormwater management facility on plans and in stormwater management report. Ensure details on plans agree with details in report. Label structures so plans and details in report and on plan can be easily correlated.

    3.

    Post Development Downstream Analysis

    A.

    Provide analysis of downstream conditions at each point or area along project boundary at which runoff will exit the property.

    B.

    Extend analysis of downstream conditions to include all portions of the downstream conveyances between the site and the point where the site area is 10 percent of the total basin area.

    C.

    Compare capacity vs. designed flows for each downstream conveyance between site and 10% point.

    4.

    Minimum Hydrology Design Parameters

    A.

    Existing condition, pervious vegetated areas maximum CN = 55.

    B.

    Existing condition time of concentration determination shall be in accordance with Section 2.1.5.6 in the Georgia Stormwater Management Manual (GSMM). Sheet/Overland flow lengths less than 100 feet used in GSMM equation 2.1.9 shall be justified in stormwater management report. Use of existing time of concentrations greater than calculated in accordance with GSMM 2.1.5.6 is acceptable.

    C.

    Minimum freeboard for above ground earthen stormwater management facility dams is 2 feet.

    D.

    Minimum freeboard for concrete stormwater management containment facility is 1 foot.

    Other Hydrology and Drainage Items

    1.

    Show a 20 ft. graded (max 16% slope) and stabilized access easement to all stormwater management facilities from a location of public vehicle access.

    2.

    Provide a 20 ft landscape strip as required by the City Arborist around the exterior of all Detention areas adjacent to and outside the required 10 ft. access easement.

    3.

    Show a six foot high security fence with a 10 ft. access gate outside of the ten foot access easement around each detention pond. Show the location of the access gate.

    4.

    Provide Standard 908 Detail for Earth Fill for Detention Ponds or other detail that meets the minimum standards inherent in standard 908.

    5.

    State the Water Quality Volume, the Channel Protection Volume, the 25-year volume, and the 100-year volume on the plans. State the Water Quality elevation, the Channel Protection elevation, the 25-year elevation and the 100 year elevation on the plans.

    6.

    Eliminate proposed concentrated discharge from site where existing condition is sheet flow.

    7.

    When serving more than three lots, detention ponds shall be located on a separate parcel Where no home can be constructed.

    8.

    Provide design professional seal and signature on plans and report.

    Inspection and Maintenance Agreement (Sandy Springs Code of Ordinances Chap. 14, Art. 5, 3.d)

    1.

    An Inspection and Maintenance Agreement for all stormwater management facilities must be approved by the Community Development Department before permitting.

    2.

    State name or official title of person(s) responsible for carrying out inspection and maintenance.

    3.

    Responsibility shall remain with property owner and shall pass to any successor owner.

    4.

    Include schedule for when and how often routine inspection and maintenance will occur.

    5.

    Include plans for annual inspections and include remedies for default.

    6.

    Agreement shall be recorded before final plat approval for residential developments and before certificate of occupancy for other developments.