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Stormwater pond/ wetland - construction inspection checklist

<font size=3>'''Stormwater pond/ wetland - construction inspection checklist.'''</font size><br>
Link to this [[Stormwater pond/ wetland - construction inspection checklist|table]]<br>
To access an Excel version of form (for field use), click [[ Forms (including field inspection forms)|here]].
<table class="sortable">
<tr>
<td colspan=3>Project:</td>
</tr>
<tr>
<td colspan=3>Location:</td>
</tr>
<tr>
<td colspan=3>Site Status:</td>
</tr>
<tr>
<td colspan=3>Date:</td>
</tr>
<tr>
<td colspan=3>Time:</td>
</tr>
<tr>
<td colspan=3>Inspector:</td>
</tr>
<tr>
<th width="25%">Construction Sequence</th>
<th width="25%">Satisfactory/Unsatisfactory</th>
<th width="50%">Comments</th>
</tr>
<tr>
<th colspan=3>1. Pre-Construction/Materials and Equipment</th>
</tr>
<tr>
<td>Pre-construction meeting</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Pipe and appurtenances on-site prior to construction and dimensions checked</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>1. Material (including protective coating, if specified)</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>2. Diameter</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>3. Dimensions of metal riser or pre-cast concrete outlet structure</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>4. Required dimensions between water control structures (orifices, weirs, etc.) are in accordance with approved plans</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>5. Barrel stub for prefabricated pipe structures at proper angle for design barrel slope</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>6. Number and dimensions of prefabricated antiseep collars</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>7. Watertight connectors and gaskets</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>8. Outlet drain valve</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Project benchmark near pond site</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Facility location staked out</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Equipment for temporary de-watering</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Temporary erosion and sediment control in place</td>
<td> </td>
<td> </td>
</tr>

<tr>
<th colspan=3>2. Subgrade Preparation</th>
</tr>

<tr>
<td>Area beneath embankment stripped of all vegetation, topsoil, and organic matter</td>
<td> </td>
<td> </td>
</tr>
<tr>
<th colspan=3>3. Pipe Installation</th>
</tr>

<tr>
<td>Method of installation detailed on plans</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>A. Bed preparation</td>
</tr>

<tr>
<td>Installation trench excavated with specified side slopes</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Stable, uniform, dry subgrade of relatively impervious material (If subgrade is wet, contractor shall have defined steps before proceeding with installation)</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Invert at proper elevation and grade</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>B. Pipe placement</td>
</tr>

<tr>
<td>Metal / plastic pipe</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>1. Watertight connectors and gaskets properly installed</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>2. Anti-seep collars properly spaced and having watertight connections to pipe</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>3. Backfill placed and tamped by hand under “haunches” of pipe</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>4. Remaining backfill placed in max. 8 inch lifts using small power tamping equipment until 2 feet cover over pipe is reached</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>Concrete pipe</td>
</tr>

<tr>
<td>1. Pipe set on blocks or concrete slab for pouring of low cradle</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>2. Pipe installed with rubber gasket joints with no spalling in gasket interface area</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>3. Excavation for lower half of anti-seep collar(s) with reinforcing steel set</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>4. Entire area where anti-seep collar(s) will come in contact with pipe coated with mastic or other approved waterproof sealant</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>5. Low cradle and bottom half of anti-seep collar installed as monolithic pour and of an approved mix</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>6. Upper half of anti-seep collar(s) formed with reinforcing steel set</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>7. Concrete for collar of an approved mix and vibrated into place (protected from freezing while curing, if necessary)</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>8. Forms stripped and collar inspected for honeycomb prior to backfilling. Parge if necessary.</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>C. Backfilling</td>
</tr>

<tr>
<td>Fill placed in maximum 8 inch lifts</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Backfill taken minimum 2 feet above top of antiseep collar elevation before traversing with heavy equipment</td>
<td> </td>
<td> </td>
</tr>

<tr>
<th colspan=3>4. Riser / Outlet Structure Installation</th>
</tr>

<tr>
<td>Riser located within embankment</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>A. Metal riser</td>
</tr>
<tr>
<td>Riser base excavated or formed on stable subgrade to design dimensions</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Set on blocks to design elevations and plumbed</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Reinforcing bars placed at right angles and projecting into sides of riser</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Concrete poured so as to fill inside of riser to invert of barrel</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td colspan=3>B. Pre-cast concrete structurer</td>
</tr>
<tr>
<td>Dry and stable subgrade</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Riser base set to design elevation</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>If more than one section, no spalling in gasket interface area; gasket or approved caulking material placed securely</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Watertight and structurally sound collar or gasket joint where structure connects to pipe spillway</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>C. Poured concrete structure</td>
</tr>

<tr>
<td>Footing excavated or formed on stable subgrade, to design dimensions with reinforcing steel set</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Structure formed to design dimensions, with reinforcing steel set as per plan</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Concrete of an approved mix and vibrated into place (protected from freezing while curing, if necessary)</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Forms stripped & inspected for honeycomb prior to backfilling; parge if necessary</td>
<td> </td>
<td> </td>
</tr>

<tr>
<th colspan=3>5. Embankment Construction</th>
</tr>

<tr>
<td>Fill material</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Compaction</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>Embankment</td>
</tr>

<tr>
<td>1. Fill placed in specified lifts and compacted with appropriate equipment</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>2. Constructed to design cross-section, side slopes and top width</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>3. Constructed to design elevation plus allowance for settlement</td>
<td> </td>
<td> </td>
</tr>
<tr>
<th colspan=3>6. Impounded Area Construction</th>
</tr>

<tr>
<td>Excavated / graded to design contours and side slopes</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Inlet pipes have adequate outfall protection</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Forebay(s) constructed per plans</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Pond benches construction per plans</td>
<td> </td>
<td> </td>
</tr>
<tr>
<th colspan=3>7. Earth Emergency Spillway Construction</th>
</tr>

<tr>
<td>Spillway located in cut or structurally stabilized with riprap, gabions, concrete, etc.</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Excavated to proper cross-section, side slopes and bottom width</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Entrance channel, crest, and exit channel constructed to design grades and elevations</td>
<td> </td>
<td> </td>
</tr>

<tr>
<th colspan=3>8. Outlet Protection</th>
</tr>

<tr>
<td colspan=3>A. End section</td>
</tr>
<tr>
<td>Securely in place and properly backfilled</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td colspan=3>B. Endwall</td>
</tr>

<tr>
<td>Footing excavated or formed on stable subgrade, to design dimensions and reinforcing steel set, if specified</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Endwall formed to design dimensions with reinforcing steel set as per plan</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Concrete of an approved mix and vibrated into place (protected from freezing, if necessary)</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Forms stripped and structure inspected for honeycomb prior to backfilling; parge if necessary</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>C. Riprap apron / channel</td>
</tr>

<tr>
<td>Apron / channel excavated to design cross-section with proper transition to existing ground</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Filter fabric in place</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Stone sized as per plan and uniformly place at the thickness specified</td>
<td> </td>
<td> </td>
</tr>

<tr>
<th colspan=3>9. Vegetative Stabilization</th>
</tr>

<tr>
<td>Approved seed mixture or sod</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Proper surface preparation and required soil mendments</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Excelsior mat or other stabilization, as per plan</td>
<td> </td>
<td> </td>
</tr>

<tr>
<th colspan=3>10. Miscellaneous</th>
</tr>

<tr>
<td>Drain for ponds having a permanent pool</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Trash rack / anti-vortex device secured to outlet structure</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Trash protection for low flow pipes, orifices, etc.</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Fencing (when required)</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Access road</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Set aside for clean-out maintenance</td>
<td> </td>
<td> </td>
</tr>

<tr>
<th colspan=3>11. Stormwater Wetlands</th>
</tr>

<tr>
<td>Adequate water balance</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Variety of depth zones present</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Approved pondscaping plan in place and budget for additional plantings</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Plants and materials ordered 6 months prior to construction</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Construction planned to allow for adequate planting and establishment of plant community (April-June planting window)</td>
<td> </td>
<td> </td>
</tr>

<tr>
<th colspan=3>12. Final Inspection</th>
</tr>

<tr>
<td>Construction sediment removed from settling basin</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Contributing drainage area stabilized</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Vegetation established per specifications</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td>Inlet and outlet structures operational</td>
<td> </td>
<td> </td>
</tr>

<tr>
<td colspan=3>Comments:

</td>
</tr>

<tr>
<td colspan=3>Actions to be Taken:

</td>
</tr>

</table>
[[category:table]]
[[category:Checklist]]