Appendix F: Construction Inspection ChecklistsTools Stormwater/Wetland Pond Construction Inspection Checklist Project: Location: Site Status: Date: Time: Inspector: SATISFACTORY/ CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY Pre-Construction/Materials and Equipment Pre-construction meeting Pipe and appurtenances on-site prior to construction and dimensions checked 1. Material (including protective coating, if specified) 2. Diameter 3. Dimensions of metal riser or pre-cast concrete outlet structure 4. Required dimensions between water control structures (orifices, weirs, etc.) are in accordance with approved plans 5. Barrel stub for prefabricated pipe structures at proper angle for design barrel slope 6. Number and dimensions of prefabricated anti-seep collars 7. Watertight connectors and gaskets 8. Outlet drain valve Project benchmark near pond site Equipment for temporary de-watering F-1 New Y o r k S t a t e S t o r m w a t e r M a n a g e m e n t D e sign Ma nual Appendix F SATISFACTORY/ CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY 2. Subgrade Preparation Area beneath embankment stripped of all vegetation, topsoil, and organic matter 3. Pipe Spillway Installation Method of installation detailed on plans A. Bed preparation Installation trench excavated with specified side slopes Stable, uniform, dry subgrade of relatively impervious material (If subgrade is wet, contractor shall have defined steps before proceeding with installation) Invert at proper elevation and grade B. Pipe placement Metal / plastic pipe 1. Watertight connectors and gaskets properly installed 2. Anti-seep collars properly spaced and having watertight connections to pipe 3. Backfill placed and tamped by hand under Ahaunches@ of pipe 4. Remaining backfill placed in max. 8 inch lifts using small power tamping equipment until 2 feet cover over pipe is reached F-2 New Y o r k S t a t e S t o r m w a t e r M a n a g e m e n t D e sign Ma nual Appendix F SATISFACTORY/ CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY 3. Pipe Spillway Installation Concrete pipe 1. Pipe set on blocks or concrete slab for pouring of low cradle 2. Pipe installed with rubber gasket joints with no spalling in gasket interface area 3. Excavation for lower half of anti-seep collar(s) with reinforcing steel set 4. Entire area where anti-seep collar(s) will come in contact with pipe coated with mastic or other approved waterproof sealant 5. Low cradle and bottom half of anti-seep collar installed as monolithic pour and of an approved mix 6. Upper half of anti-seep collar(s) formed with reinforcing steel set 7. Concrete for collar of an approved mix and vibrated into place (protected from freezing while curing, if necessary) 8. Forms stripped and collar inspected for honeycomb prior to backfilling. Parge if necessary. C. Backfilling Fill placed in maximum 8 inch lifts Backfill taken minimum 2 feet above top of anti- seep collar elevation before traversing with heavy equipment F-3 New Y o r k S t a t e S t o r m w a t e r M a n a g e m e n t D e sign Ma nual Appendix F SATISFACTORY/ CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY 4. Riser / Outlet Structure Installation Riser located within embankment A. Metal riser Riser base excavated or formed on stable subgrade to design dimensions Set on blocks to design elevations and plumbed Reinforcing bars placed at right angles and projecting into sides of riser Concrete poured so as to fill inside of riser to invert of barrel B. Pre-cast concrete structure Dry and stable subgrade Riser base set to design elevation If more than one section, no spalling in gasket interface area; gasket or approved caulking material placed securely Watertight and structurally sound collar or gasket joint where structure connects to pipe spillway C. Poured concrete structure Footing excavated or formed on stable subgrade, to design dimensions with reinforcing steel set Structure formed to design dimensions, with reinforcing steel set as per plan Concrete of an approved mix and vibrated into place (protected from freezing while curing, if necessary) Forms stripped & inspected for Ahoneycomb@ prior to backfilling; parge if necessary F-4 New Y o r k S t a t e S t o r m w a t e r M a n a g e m e n t D e sign Ma nual Appendix F SATISFACTORY/ CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY 5. Embankment Construction Fill material Compaction Embankment 1. Fill placed in specified lifts and compacted with appropriate equipment 2. Constructed to design cross-section, side slopes and top width 3. Constructed to design elevation plus allowance for settlement 6. Impounded Area Construction Excavated / graded to design contours and side slopes Inlet pipes have adequate outfall protection Forebay(s) Pond benches 7. Earth Emergency Spillway Construction Spillway located in cut or structurally stabilized with riprap, gabions, concrete, etc. Excavated to proper cross-section, side slopes and bottom width Entrance channel, crest, and exit channel constructed to design grades and elevations F-5 New Y o r k S t a t e S t o r m w a t e r M a n a g e m e n t D e sign Ma nual Appendix F SATISFACTORY / CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY 8. Outlet Protection A. End section Securely in place and properly backfilled B. Endwall Footing excavated or formed on stable subgrade, to design dimensions and reinforcing steel set, if specified Endwall formed to design dimensions with reinforcing steel set as per plan Concrete of an approved mix and vibrated into place (protected from freezing, if necessary) Forms stripped and structure inspected for Ahoneycomb@ prior to backfilling; parge if necessary C. Riprap apron / channel Apron / channel excavated to design cross- section with proper transition to existing ground Filter fabric in place Stone sized as per plan and uniformly place at the thickness specified 9. Vegetative Stabilization Approved seed mixture or sod Proper surface preparation and required soil amendments Excelsior mat or other stabilization, as per plan F-6 New Y o r k S t a t e S t o r m w a t e r M a n a g e m e n t D e sign Ma nual Appendix F SATISFACTORY/ CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY 10. Miscellaneous Drain for ponds having a permanent pool Trash rack / anti-vortex device secured to outlet structure Trash protection for low flow pipes, orifices, etc. Fencing (when required) Access road Set aside for clean-out maintenance 11. Stormwater Wetlands Adequate water balance Variety of depth zones present Approved pondscaping plan in place Reinforcement budget for additional plantings Plants and materials ordered 6 months prior to construction Construction planned to allow for adequate planting and establishment of plant community (April-June planting window) Wetland buffer area preserved to maximum extent possible Comments: F-7 New Y o r k S t a t e S t o r m w a t e r M a n a g e m e n t D e sign Ma nual Appendix F Actions to be Taken: F-8 New York State Stormwater Management Design Manual Appendix F Infiltration Trench Construction Inspection Checklist Project: Location: Site Status: Date: Time: Inspector: SATISFACTORY/ CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY 1. Pre-Construction Pre-construction meeting Runoff diverted Soil permeability tested Groundwater / bedrock sufficient at depth 2. Excavation Size and location Side slopes stable Excavation does not compact subsoils 3. Filter Fabric Placement Fabric specifications Placed on bottom, sides, and top F-9 New York State Stormwater Management Design Manual Appendix F SATISFACTORY / CONSTRUCTION SEQUENCE COMMENTS UNSATISFACTORY 4. Aggregate Material Size as specified Clean / washed material Placed properly 5. Observation Well Pipe size Removable cap / footplate Initial depth = feet 6. Final Inspection Pretreatment facility in place Contributing watershed stabilized prior to flow diversion Outlet Comments: F-10