[Materials
List]
1/2 day - Install
sediment control devices. (These
are for larger projects. Check with your local building
permit office. It’s a good idea to surround the down
gradient part of the site with straw bales or silt fence.
It’s readily available and inexpensive.)
1 day - Grade site to elevations shown on plan. If
applicable, construct curb openings and/or remove and
replace existing concrete. Curb openings should be blocked
or other measures taken to prohibit drainage from entering
construction area. (Equipment such as a backhoe may be
rented for this. Make sure any Miss Utility is notified
before any digging. Safety fence should be used around any
construction area or excavation.)
1/2 day - Stabilize grading within Limit of
Disturbance except for the bioretention area, which will be
planted. (Surrounding the cell with a biolog, straw bales,
or compost berm to keep sediment out of the bioretention
cell.)
1/2 day - Excavate bioretention area to proposed
invert depth and scarify the existing soil surfaces, taking
care not to compact the in-situ materials. (A contractor may
be hired to dig the hole. Make sure that there are no open
areas or pits open at the end of the day and no excavation
over local jurisdiction or OSHA limits. Generally
bioretention cells are less than 3 feet deep.)
1/2 day - Install underdrain system and observation
wells, if specified. (Use perforated 4” HDPE pipe and
surround the pipe with about 2” of gravel)
1/4 day - Backfill bioretention area with planting
soil. (Fill the cell with 8” lifts of soil. Saturate each
lift and let it drain and then place the next lift. Be
careful not to compact the soil with equipment and saturate
it.)
1/4 day - Plant vegetation.
1/4 day - Mulch and install erosion protection at
entrance points. Remove sediment control practices or
entrance blocks with inspector authorization if this project
requires a permit. (It is recommended to leave perimeter
biodegradable controls to reduce sediment loads to cell)
Total Estimated Construction Time: 5.5 Days
