Appendix I Checklists Town of Greenwich Drainage Manual
Department of Public Works - Engineering Division Town Hall - 101 Field Point Road, Greenwich, CT 06836-2540 Phone 203-622-7767 - Fax 203-622-7747 STORMWATER MANAGEMENT STANDARDS EXEMPTION REQUEST FORM Project Name Project Address Project Lot Number(s) Property Owner(s) Tax Account Number(s) Zone(s) Lot Area 1. Check all that apply to the proposed project: This is a new development or redevelopment project, The project will result in an increased amount of stormwater runoff and/or water pollutants flowing from a parcel of land (prior to the application of stormwater Best Management Practices), The project will alter the drainage characteristics of a parcel of land (prior to the application of stormwater Best Management Practices). Categorical Exemptions: 2. Does the proposed project meet one of the following categorical exemptions? Check all that apply: Normal maintenance and improvement of land in agricultural use (as defined by Connecticut General Statutes), provided such activity conforms to acceptable management practices for pollution control approved by the Connecticut Department of Energy and Environmental Protection and the Greenwich Inland Wetlands and Watercourses Commission. This exemption does not apply to construction activities that are not directly related to the farming or agricultural operation. Routine maintenance of existing landscaping, gardens (excluding structural modifications to stormwater BMPs including rain gardens) or lawn areas including those maintained by the Town of Greenwich Parks and Recreation Department and Board of Education. Resurfacing of an existing impervious area on a non-residential lot such as repaving an existing parking lot or drive with no increase in impervious cover. Routine maintenance to existing town roads that is performed to maintain the original width, line, grade, hydraulic capacity, or original purpose of the roadway. Customary cemetery management. Emergency repairs to any stormwater management facility or practice that poses a threat to public health or safety, or as deemed necessary by the approving authority. Any emergency activity that is immediately necessary for the protection of life, property, or the environment, as determined by the approving authority. Repair of an existing septic system. Construction of utilities (gas, water, electric, telephone, etc.), other than drainage, which will not permanently alter terrain, ground cover, or drainage patterns. Repair or replacement of an existing roof of a single-family dwelling. Construction of a second (or higher) floor addition on an existing building. The construction of any fence that will not alter existing terrain or drainage patterns. If so, the Greenwich Stormwater Management Standards shall not apply, and submittal of a Stormwater Management Report is not required. However, application of the standards is still strongly encouraged. Page 1 of 5
Department of Public Works - Engineering Division Town Hall - 101 Field Point Road, Greenwich, CT 06836-2540 Phone 203-622-7767 - Fax 203-622-7747 Conditional Exemptions Requiring PE Certification: 3. For projects adding up to 500 square feet of impervious surfaces 1, check all that apply: The project design, including the proposed drainage design, if any, will not have an adverse effect on offsite properties or offsite drainage infrastructure, as certified by a professional engineer. At least one of the following or similar measures shall be implemented on the project site to help mitigate the effects of site disturbance and new impervious cover: Disconnecting roof down spouts Constructing a rain garden Installing a rain barrel Planting new trees or placing existing trees in a conservation easement or constructing a planted buffer to intercept sheet flow from the new impervious cover Restoring a riparian buffer Other: For projects that meet the above criteria, the project proponent shall submit Pages 1, 2, 4, and 5 of this exemption request form, including the Professional Engineer Exemption Certification, in lieu of a Stormwater Management Report. For projects adding up to 500 square feet of impervious surfaces, application of the Greenwich Stormwater Management Standards is still strongly encouraged. For projects that meet the above criteria, the project proponent does not need to submit the items on the Checklist for Operations and Maintenance Plan Report. Residential teardowns demolition and reconstruction or replacement of an existing residential dwelling with another residence of any size are not exempt. PROPERTY OWNER(S) AUTHORIZATION Signature Date Name Street Address City State Zip Phone FAX Page 2 of 5
Department of Public Works - Engineering Division Town Hall - 101 Field Point Road, Greenwich, CT 06836-2540 Phone 203-622-7767 - Fax 203-622-7747 Conditional Exemptions Requiring PE Certification: 4. For projects adding between 500 and 1,000 square feet of impervious surfaces 1, check all that apply: The project design, including the proposed drainage design, if any, will not have an adverse effect on offsite properties or offsite drainage infrastructure, as certified by a professional engineer. At least one of the following or similar measures shall be implemented on the project site to help mitigate the effects of site disturbance and new impervious cover: Disconnecting roof down spouts Constructing a rain garden Installing a rain barrel Planting new trees or placing existing trees in a conservation easement or constructing a planted buffer to intercept sheet flow from the new impervious cover Restoring a riparian buffer Other: At least one of the following measures shall be implemented on the project site using LID or conventional stormwater BMPs to help mitigate the effects of site disturbance and new impervious cover: A zero increase in peak flow to all points of concern for the 1, 2, 5, 10, and 25-year design storms The runoff volume from the new impervious cover shall be infiltrated for the 10-year design storm For projects that meet the above criteria, the project proponent shall submit Pages 1, 3, 4, and 5 of this exemption request form, including the Professional Engineer Exemption Certification, in lieu of a Stormwater Management Report. For projects adding between 500 and 1,000 square feet of impervious surfaces, application of the Greenwich Stormwater Management Standards is still strongly encouraged. For projects that meet the above criteria, the project proponent does not need to submit the items on the Checklist for Operations and Maintenance Plan Report. Residential teardowns demolition and reconstruction or replacement of an existing residential dwelling with another residence of any size are not exempt. Projects adding between 500 and 1,000 square feet of impervious surfaces located within, near, or discharging to a critical area (as described in Section 5.7.3 of the Town of Greenwich Drainage Manual) are also not exempt. PROPERTY OWNER(S) AUTHORIZATION Signature Date Name Street Address City State Zip Phone FAX Page 3 of 5
Department of Public Works - Engineering Division Town Hall - 101 Field Point Road, Greenwich, CT 06836-2540 Phone 203-622-7767 - Fax 203-622-7747 PROFESSIONAL ENGINEER EXEMPTION CERTIFICATION I hereby declare that the proposed project will add the following amount of impervious surfaces to the project site (check the box that applies): 0 to 500 square feet (conditionally exempt with PE Certification) 500 to 1,000 square feet (conditionally exempt with PE Certification) It is my professional opinion that the project design, including the proposed drainage system, if any, will not have an adverse effect on offsite properties or offsite drainage infrastructure. I further declare that at least one of the following or similar measures shall be implemented on the project site to help mitigate the effects of site disturbance and new impervious cover for 0 to 1,000 square feet (check all that apply): Disconnecting roof down spouts Constructing a rain garden Installing a rain barrel Planting new trees or placing existing trees in a conservation easement or constructing a planted buffer to intercept sheet flow from the new impervious cover Restoring a riparian buffer Other: I further declare that at least one of the following measures shall be implemented on the project site to help mitigate the effects of site disturbance and new impervious cover for 500 to 1,000 square feet (check all that apply) A zero increase in peak flow to all points of concern for the 1, 2, 5, 10, and 25-year design storms The runoff volume from the new impervious cover shall be infiltrated for the 10-year design storm Engineer s Signature Date Engineer s Seal Page 4 of 5
Department of Public Works - Engineering Division Town Hall - 101 Field Point Road, Greenwich, CT 06836-2540 Phone 203-622-7767 - Fax 203-622-7747 IMPERVIOUS AREA WORKSHEET This worksheet shall be used to quantify impervious surfaces 1 associated with existing and proposed construction on your site. Please complete columns 1, 2, and 3 below listing the first floor or ground level square footage of each existing or proposed structure or site amenity. Driveway/Sidewalk (1) Existing Conditions Impervious Surfaces (sq ft) (2) Proposed Conditions Impervious Surfaces (sq ft) (3) Proposed New Impervious Surfaces (sq ft) [Column 2 minus column 1] House/Building(s) House/Building Addition Swimming Pool/ Tennis Court/Patio Areas Other TOTALS: 1 Refer to the glossary in the Town of Greenwich Drainage Manual for a definition of impervious surface. Page 5 of 5
Project Name: Site Development Review Request Project Address: Engineer s Name: Engineering Firm s Name: Street Address: City: State: Zip: Phone: Fax: Email: Item Check One Type 1 Preliminary Site Plan Review Stormwater Management Report Part One or Stormwater Management Standards Request for Exemption (Items on Checklist for Stormwater Management Report Part One) Items on Checklist for Construction Plans Items on Checklist for Information Required on New & Improved Driveways 2 Final Site Plan Review Approved Stormwater Management Report Part One Stormwater Management Report Part Two or Stormwater Management Standards Request for Exemption (Items on Checklist for Stormwater Management Report Part Two) Items on Checklist for Construction Plans Items on Checklist for Information Required on New & Improved Driveways Preliminary Operations & Maintenance Plan Report (Items on Checklist for Operations & Maintenance Plan Report) 3 Construction Site Plan Review (Building Permit ) Stormwater Management Report Part Two or Stormwater Management Standards Request for Exemption (Items on Checklist for Stormwater Management Report Part Two) Items on Checklist for Construction Plans Items on Checklist for Information Required on New & Improved Driveways Preliminary Operations & Maintenance Plan Report (Items on Checklist for Operations & Maintenance Plan Report) Engineer & Developer of Record Certification 4 Construction Site Plan Field Change Review 5 Temporary Certificate of Occupancy Review Items on Checklist for Certificate of Occupancy Improvement Location Survey (Items on Checklist for Improvement Location Survey Depicting As-Built Conditions) Final Operations & Maintenance Plan Report (Items on Checklist for Operations & Maintenance Plan Report) Drainage Certification Sign-Off Site Inspection Certification Sign-Off Listing Remaining Work Amended Soils Certification Sign-Off Field Inspection Record Retaining Wall Certification Sign-Off & Retaining Wall Field Inspection Record * Residential TCO only issued in winter months when vegetation and paving can t be completed. 6 Certificate of Occupancy Review Items on Checklist for Certificate of Occupancy Improvement Location Survey (Items on Checklist for Improvement Location Survey Depicting As-Built Conditions) Final Operations & Maintenance Plan Report (Items on Checklist for Operations & Maintenance Plan Report) Drainage Certification Sign-Off Site Inspection Certification Sign-Off Amended Soils Certification Sign-Off Field Inspection Record Retaining Wall Certification Sign-Off & Retaining Wall Field Inspection Record
Checklist for Stormwater Management Report Part One Item Name of Item Required Items 1 Project Narrative 2 Identify Applicable Land Use Regulations 3 Site Inventory & Evaluation Topography Soil Evaluation o o Initial Feasibility Evaluation Concept Design Testing (test pits/borings and saturated hydraulic conductivity testing, as necessary) Hydrologic Patterns & Features Native Forest & Soil Conservation Areas Wetlands & Riparian Management Areas Floodplains & Waterbodies Natural Drainage Ways 4 Define Development Envelope Determine/Protect Sensitive Areas Retain & Protect Mature Trees Steep Slopes over 25% Delineate preferred areas for infiltration (A & B Soils) Confine envelope to areas to be permanently altered 5 Develop LID Control Strategies Evaluate Pre-Development Site Hydrology (Runoff Volume and Peak Flow Rate 1, 2, 5, 10, 25, 50 and 100-Year Storms) o Watershed Map Pre-Development o NRCS Runoff Curve Numbers Pre-Development o Time of Concentration Pre-Development Minimize Total Site Impervious Area Minimize Directly Connected Impervious Areas Minimize Site Disturbance Modify Drainage Flow Paths to Increase Time of Concentration Evaluate Post-Development Site Hydrology (Runoff Volume and Peak Flow Rate 1, 2, 5, 10, 25, 50 and 100-Year Storms) o Watershed Map Post-Development o NRCS Runoff Curve Numbers Post-Development o Time of Concentration Post-Development Compare & Summarize Pre-&-Post Development Site Hydrology to Evaluate Benefits of Non-Structural Site Planning Techniques. Identify Remaining need for Structural BMPs to Satisfy: o Water Quality Volume o TSS Removal Computations o Runoff Reduction Volume: 1-Year Storm o Groundwater Recharge Volume (if necessary) o o 6 Supporting Documents 2-Year Over Control Channel Protection (Required on a Site by Site Basis) Peak Runoff Attenuation: 2, 5, & 10-Year Storm (and 25-Year Storm for projects that do not rely solely on LID BMPs), 50-Year & 100-Year Peak Runoff Attenuation Required on a Site by Site Basis 7 Sealed and Signed By a Professional Engineer
Checklist for Stormwater Management Report Part Two Item Name of Item 1 Approved Stormwater Management Report Part One 2 Remaining Structural BMPs to Meet Water Quality Volume/Flow (WQV)/(WQF) and TSS Removal 3 Remaining Structural BMPs to Meet Runoff Reduction Volume (RRV): 1-Year Storm 4 5 6 7 Remaining Structural BMPs to Meet Groundwater Recharge Volume (GRV), if necessary Remaining Structural BMPs to Meet Stream Channel Protection: 2-Year Frequency ( Over-Control of 2-Year Storm) Required on Site By Site Basis Remaining Structural BMPs to Meet Peak Runoff Attenuation: 2, 5, & 10 Year; 25- Year for Projects that Do Not Rely Solely on LID BMPs; 50-Year & 100-Year Required on Site by Site Basis Conveyance Protection: 10, 25, 50 & 100-Year Depending on Peak Flow Rate for Which Downstream Stormwater Facilities are Designed 8 Emergency Outlet Sizing: Safely Pass the 100-Year 9 Culvert Capacity Calculations 10 Outlet Protection Calculations Based on Conveyance Protection 11 Downstream Analysis Required on Site by Site Basis 12 Town Storm Drain Analysis Required on Site by Site Basis 13 Gutter Flow Calculations Required on Site by Site Basis 14 Supporting Documents 15 Sealed and Signed By a Professional Engineer Required For Final Required For Construction
Checklist for Construction Plans Item Name of Item Required For Preliminary Required For Final Required For Construction 1 Cover Sheet 2 Existing Conditions Survey Sheets 3 Low Impact Development Plan Sheets 4 Site Plan Sheets 5 Excavation and Filling Calculations and Details 6 Driveway Profile & Sight Distance Sheets 7 Turning Movements Sheets 8 Traffic Signage Sheets 9 Erosion & Sediment Control Sheets 10 Construction Details Sheets 11 Architectural Elevations & Engineering Sections 12 Roof Drainage Layout Sheets 13 Bind Plan Set No Separate Sheets 14 15 All Surveys Sealed & Signed by a Licensed Surveyor All Site Plans Sealed & Signed by a Professional Engineer
Checklist for Information Required on New and Improved Driveways Item Name of Item Required For Preliminar y Required For Final Required For Constructio n 1 Sight Distance for Existing Driveway on Plan 2 Sight Distance for Proposed Driveway on Plan 3 Sight Line Profile for Proposed Driveway on Plan 4 Proposed Driveway Width at Property Line on Plan 5 Proposed Driveway Width at Edge of Road on Plan 6 Distance from Proposed Driveway to Intersection on Plan 7 Distance between Proposed Driveways on Plan 8 Distance from Proposed Driveway to Property Line on Plan 9 Distance from Edge of Road to Proposed Driveway Gate (Minimum 25 Feet) 10 Town of Greenwich Driveway Entrance Details on Plans 11 Proposed Driveway Profile from Edge of Road to Garage 12 13 14 21 Slope of Proposed Driveway for first five feet on Profile (+3% to 6%) Slope of Proposed Driveway for next twenty feet on Profile (Maximum Slope of 4%) Slope of Proposed Driveway for the remaining distance to Garage on Profile (Maximum Slope of 9% for Commercial, 12% Residential (Two or More Family), and 15% for Residential) Driveway Sight Distance Plan Must be for the entire Lot Frontage, entire Town of Greenwich Right-of-Way Width, and be certified A-2 & T-2
Checklist for Operation & Maintenance Plan Report Item Name of Item Required For Final Required For Construction Required For Certificate of Occupancy 1 Stormwater Management System Owners 2 Party or Parties Responsible for Operation & Maintenance 3 Inspection & Maintenance Schedule 4 Operation & Maintenance Log Form 5 Maintenance Declaration Draft 6 Maintenance Declaration Filed on Greenwich Land Records 7 Improvement Location Survey Depicting all Non-Structural & Structural BMPs 8 Sealed & Signed By a Professional Engineer
Checklist for Certificate of Occupancy Item 1 Drainage Certification Sign-Off 2 Site Inspection Certification Sign-Off Name of Item Required For Certificate of Occupancy 3 Soil Evaluation Test Results and Certification Sign-Off (as applicable) 4 Bioretention Soil Testing Certification Sign-Off (as applicable) 5 Bioretention Post-Construction Flow Rate Testing Certification Sign-Off (as applicable) 6 Retaining Wall Certification Sign-Off 7 Field Inspection Record 8 Retaining Wall Field Inspection Record 9 Improvement Location Survey Depicting As-Built Conditions 10 Final Operation & Maintenance Plan Report 11 Copy of Revised Construction Site Plans not submitted for Construction Site Plan Field Change Review
Checklist for Improvement Location Survey Depicting As-Built Conditions Item 1 Property Lines 2 Buildings, Garage, Etc 3 Patios, Walks, Etc 4 Driveways, Roads, Etc 5 Tennis Court, Pool, Etc 6 Fence, Walls, Etc 7 Catch Basins, Manholes, Etc Name of Item Required For Certificate of Occupancy 8 Roof Down Spout Locations and Entire Pipe Network to Discharge 9 All Pipes Shall Have Type, Size & Slope 10 Footing Drain Network to Discharge 11 Scour Holes/Level Spreader, Etc 12 Underground Systems Shall Show Number of Units, Size, Model#, Bottom Elevation, Invert Elevation In & Out 13 Control Structures Shall Show Outlet Type, Size, & Elevation 14 Two Foot Contours One Foot Contours when slopes less than 2% 15 Spot Elevations 16 Top & Bottom Elevation of Walls 17 Elevation of Discharge Outlets 18 Invert Elevations for All Pipes 19 Cover & Grate Elevations 20 Low Impact Development Non-Structural BMPs 21 Low Impact Development Structural BMPs 22 Sealed and Signed by a State of Connecticut Licensed Surveyor