Memo from SRF 04-15-2011ILI N E N G I N E E S
PLANNERS
D E S I G N E R S
Consulting Group, Inc.
SRF No. 7068
MEMORANDUM
TO: Members of the TEP, Army Corps
FROM: Jeffrey Olson, Associate Scientist, SRF Consulting Group, Inc.
DATE: April 15, 2011
SUBJECT: TH 41 UNDERPASs TRAIL; CARVER COUNTY
Dear Members of the TEP, Army Corps, and Associated,
The purpose of this Memorandum is to address comments that have been gathered from
Members of the TEP and the Corps concerning the TH 41 Underpass Trail Project. This
Memorandum will serve as a Permit Application Supplement. Table 1 presents comments and
responses to comments. Figures 1 -5 (attached) show "screen shots" of portions of the trail that
impact wetlands and call -out boxes that demonstrate instances of wetland impact minimization
(side slope steepening, trail profile lowering, and alignment adjustments) and illustrate points
made in Table 1. Appendix A, relevant to Comment #7 in Table 1 below, shows proposed
MnDOT seed mixes for trail clear zones and side slopes.
Per Comment#4 in Table 1, below, we agree that impacts to Wetland #8 would likely be a total
take given the small amount of wetland that would remain outside of the trail footprint. We have
added 0.06 ac of wetland impact to Wetland #8. The following bulleted points summarize
impacts and required mitigation as presented in the permit application - and as amended per this
permit application supplement:
• Permit Application
mitigation 0.57 ac.
• Revised Application
mitigation 0.69 ac)
(previously submitted):
(per this supplement):
Wetland Impacts 0.285 ac
Wetland impacts 0.345 ac.
Required
Required
www.srfconsulting.com
One Carlson Parkway North, Suite 150 1 Minneapolis, MN 55447 -4443 1 753.475.0010 Fax: 763.475.2329
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Appendix A: Seed Mixes for Clear Zones and Side Slopes
Mixture: 250
Common Name
Bulk Rate
% of Mix
Component
kg/ha
lb /ac
Ib /ac
Brome grass, smooth
11.0
9.8
14.0
Bluegrass, Kentucky "
Certified Park"
22.7
20.3
29.0
Bluegrass, Canada
11.0
9.8
14.0
Switch grass
2.4
2.1
3.0
Wheat- grass, slender
3.1
2.8
4.0
Rye - grass, perennial
16.5
14.7
21.0
Timothy
2.4
2.1
3.0
Redtop
2.4
2.1
3.0
Alfalfa, creeping
4.7
4.2
6.0
White Clover
2.4
2.1
3.0
GRAND TOTALS:
78.6
70
100.0
For: General Roadside excluding sandy sites
Mixture: 260
Common Name
Bulk Rate
% of Mix
Component
kg/ha
lb /ac
Ib /ac
Bluegrass, Kentucky
"Certified Park"
35.8
32
32.0
Bluegrass, Canada
11.2
10
10.0
Bluegrass, Kentucky -
Low Maintenance
33.6
30
30.0
Fescue, hard
9.0
8
8.0
Rye - grass, perennial
22.4
20
20.0
GRAND TOTALS:
112
100
100.0
For: Commercial Turf
i
Any accepted low maintenance Kentucky Bluegrass EXCEPT
"Park ".
Mixture: 270
Common Name
Bulk Rate
% of Mix
Component
k ac
Ib /ac
Bluegrass, Kentucky - Elite
33.6
30
25.0
Bluegrass, Kentucky - Improved
33.6
30
25.0
Bluegrass, Kentucky - Low
Maintenance
33.6
30
25.0
Red fescue, creeping
10.8
9.6
8.0
Rye - grass, perennial
22.8
20.4
17.0
GRAND TOTALS:
134.4
120
100.0
For: Residential Turf
Mixture: 340
Common Name
PLS Rate
% of Mix
Component
kg/ha lb /ac
Bluestem, big
3.3
3.0
21.5
Bluestem, little
2.8
2.5
18.0
Wild -rye, Canadian
2.2
2.0
14.0
Grama, sideoats
2.2
2.0
14.0
Switch grass
0.6
0.5
4.0
Dropseed, sand
0.6
0.5
3.5
Bluegrass, Canada
3.4
3.0
21.5
June grass
0.6
0.5
3.5
Grass Totals:
15.7
14.0
100.0
Winter Wheat*
Common Name
Bulk Rate
% of Mix
Component
kg/ha I lb /ac
Winter Wheat*
62.7
56.0
80.0
Rye - grass, annual
12.5
11.2
16.0
Wheatgrass, slender
3.1
2.8
4.0
Cover Crop Totals:
78.3
70
100.0
.0.5
Dry Forbs Mixture
0.6
0.5
100.0
GRAND TOTALS:
94.6
1 84.5
100.0
*Oats to be substituted for spring plantings
Application: Native mix for Sandy/Dry areas. Mid - height.
Mixture: 350
Common Name
PLS Rate
% of Mix
Component
kg/h
lb /ac
Bluestem big
3.4
3.0
21.5
Indian grass
2.8
2.5
18.0
Bluestem, little
2.8
2.5
18.0
Grama, sideoats
3.4
3.0
1 21.5
Wild-rye, Canadian
2.2
2.0
1 14.0
Switch grass
Grass Totals:
15.7
14.0
100.0
Common Name
Bulk
Rate
% of Mix
Com onent
kg/ha
lb /ac
Winter Wheat*
62.7
56.0
80.0
Rye-grass, annual
12.5
11.2
16.0
Wheat ass, slender
3.1
2.8
4.0
Cover Crop Totals:
78.3
70
100.0
Mesic Forbs Mixture
I 0.6
.0.5
100.0
GRAND TOTALS:
94.6
84.5
100.0
*Oats to be substituted forspring plantings
Application: Native mix for general roadside areas.
11