7a. Watershed site plan 10012020RECEIVED
Watershed Plans for Werb at 18657 Lamar Ave N (permit #20-031) and Walker at 18643 Lamar Ave N (permit #20-032) OCT _ 12020
Summary of CMSCWD Review and Engineer's Reports dated 9/24/20* 10/1/20
CITY OF SCANDIA
Attachment A
(site plan / map with stormwater facilities labeled)
Stormwater Management:
Footprints of the basins (do near end of construction spring 2021). Werb's to be at least 145 sq -ft (12' x 12.1' area) and no more
than 18" deep. Walker's to be at least 155 sq -ft (12' x 13' area) and no more than 18" deep. (See `Biofiltration Detail" guidance: the rain
garden biomedia area to the end of 4" pipe to be 18" to 36", 18" minimum is good. Another 6" below that equals a total biomedia arca of 24" (2').
Biomedia is mix of 80% sand, 10% certified organic compost (MNDOT Grade 2**), 10`%L9 peat. Pipe to run high to low elevation and out, W to E).
Do now: Grading and drainage plans to show how water will move from impervious surfaces (house, driveway) to the biofiltration
basin; contours and elevation of the properties is considered, grading is often done to ensure that water can flow overland from the
house to the locations for the basins. (Werb/Walker to update Draft Declaration of Maintenance of Stormwater Facilities (Att. A) to include
Grading plans). (Do landscape plans over the winter for plants** for installed basins to plant in spring 202 1) (**see 9.30.20 email links).
Do now: Erosion and sediment control plan and implementation of the contractor agreed upon practices during construction to
ensure sediment doesn't erode or leave the site (see * for details). Contact information for the responsible erosion control contractor/
site manager is Arnie Zachman, 952-240-9468,renesis.coni
Before construction begins but after erosion control is in place the District Administrator (Mike Isensee) must be notified.
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