74-01 - Minnewashta Woods PUD pt 3SITE PLAN REVIEW
of
MINNEWASHTA WOODS
Preliminary Plat
RALPH HEGMAN, OWNER
Route 5, Box # 243W
Excelsior, Minnesota 55331
Developer:
Ecklund & Swedland Construction Co.
19400 Highway #7
Excelsior, Minnesota 55331
Surveyors:
Egan Field & Nowak, Inc.
7415 Wayzata Blvd.
Minneapolis, Minnesota 55426
Site Plan Review Requested by:
Gerald W. Schlenk
for
Chanhassen Planning Commission
Reviewed by:
Donald C. Berg, District Conservationist
Robert Lueth, Soil Scientist
USDA Soil Conservation Service
City Hall
Waconia, Minnesota 55387
February 5, 1974
In Cooperation With:
Carver Soil and Water Conservation District
The preliminary plat of Minnewashta Woods has been examined by Donald C. Berl
and Robert A. Lueth of the Soil Conservation Service, as requested by the
Village of Chanhassen, on January 25, 1974.
The 10.92 acre site is located just off the North shore of Lake Minnewashta
the NWk, NEk, Section 4, R23W, T116N in the Village of Chanhassen.
The drainage is into Lake Minnewashta.
The landscape, including the soils,slopes, and existing vegetation was inver
toried and evaluated as follows:
1. Suitability of soils for the intended use.
2. Prevention of soil erosion due to land disturbance.
3. Conservation treatment of storm drainage water to control increasec
runoff and sediment and protect downstream landowners.
4. Harmonious development of roads and buildings in relation to slope,
soils, drainage, and existing trees and shrubs.
5. Construction and maintenance of water and erosion control structure
where needed.
Soil survey mapping ,units have been drawn over the preliminary plat map and
color coded to show building site limitations:
Green has slight limitations
yNn Yellow has moderate limitations
Red has severe limitations
-Blue has very severe limitations.
The colors show land slopes, land alteration, soil erosion and sediment haza
limitations. The colored lines show wetness limitations.
The soil
mapping units and major building
site limitations found on
the prop
are listed below:
Soil
Slope
Building Site
Symbol
Soil Name
Range
Limitations
Map C
HaB
Hayden loam
2
to 6 %
Slight land alteration
Gre
and soil erosion
HaC
Hayden loam
6
to 12%
Moderate land alteration
Yell
and soil erosion
HaD
Hayden loam
12
to 18%
Severe land alteration
I=e
and soil erosion
Cw
Cordova -Webster
0
to 2%
Severe wetness
Red 1
silty clay loam
'e
Glencoe silty
0
to 2%
Severe wetness
Red 1
clay loam
Pm
Peat and muck
0
to 2%
Organic materials
Red 1
1 to 3� feet
Very severe wetness
over loam
#j — 1,
to Y...�`4,
J
Soil
Slope
Building Site
Symbol
Soil Name
Range
Limitations
HaE
Hayden Loam
18 to 25%
Very severe land alteration
and soil 'erosion
HaF
Hayden loam
25 to 40%
Very severe land alteration
and soil erosion
SOIL AND
WATER CONSERVATION CONSIDERATIONS
Map (
B li
B It
The Carver Soil and Water Conservation District believes that slopes steeper
than 18 percent should be protected and a permanent vegetative cover maintai
The vegetative cover should be improved where needed with grass, shrubs, anc
plantings. Lots 17, 18, 19, and 20 in Block 2 are on slopes over 18 percent
ranging up -to 30 percent. This area is colored blue on the plan map.
Land slopes ranging from 12 to 18 percent require that homes and small buil
be carefully designed to fit in this steep landscape. Extra care is needed
construction to keep landscape alteration to a minimum. Soil conservation p
tiles may be needed to control soil erosion and prevent sediment deposition
stream in lower lying areas.
Lots 2, 5, 6, 119 12, 13, and 15 are on slopes ranging from 12 to 18 percent
colored red on the plan map. These lots should have the individual house de
signed to fit each lot. Careful excavation and placement of topsoil and spo
is required to minimize landscape alteration, control soil erosion, and mini
sediment deposition. The disturbed area should be reseeded immediately afte
the construction grading is completed. The seeding can be a temporary grass
seeding or applied mulch. This is done to protect the land until the final
scape plan is prepared and the final grades established. Then the final sod
seeding, and tree planting can be completed immediately to protect the poten
highly erodible steep slopes.
The drainage pattern of this site is such that soil wetness will be a develo
problem. The wetness problem is shown by red lines drawn on the plan map.
1, 21 4 and part of 3 in Block 1 is underlain by wet soils. These soils hav
high seasonal water table. Apparently the above lots have been partially fi
with borrowed soil. Borings through the fill should be taken in the spring
determine the location of the high seasonal water table. A plan for proper
face drainage, subsurface drainage, basement footing drains, and extra carefi
applied basement waterproofing is needed, or basement seepage will be a coat
ing problem. Lots 1, 7, 10 and 16 are partially covered by soils having a w
netisw problem and seasonal high water table. The same care to insure proper
age and construction practices to eliminate basement seepage is needed as de
above.
The 2 to 6 percent slopes colored green on the map and the 6 to 12 percent s
colored yellow on the map are considered to have a slight to moderate erosiol
sediment hazard when used for residential development with municipal sewers.
The following is a short description of the soils found on the property and
limitations for building sites, foundations for low buildings, and streets (
cost roads.
HaB, HaC, HaD, HaE, HaF Hayden loam, clay loam
Hayden soils consist of undulating to steep, well drained soils formed in g:
till on convex upland slopes. The surface layer is very dark gray loam abot
inches thick. The subsurface layer is dark grayish brown loam about 7 inch(
thick. The subsoil is dominantly yellowish brown firm clay loam about 34 it
thick. The underlying material is light olive brown loam.
The major building site limitation is very severe landscape alteration and
and sediment hazard on the E and F slopes (18 to 40%), severe landscape alt(
and erosion and sediment hazard on the D slopes (12 to 18%), and moderate 1,
scape alteration and erosion and sediment hazard on the C slopes (6 to 12%).
many Hayden areas, water moves through the soil very slowly and basement se(
is a common problem.
When used as foundations for low buildings, they have a moderate limitation:
medium shear strength, moderate shrink -swell potential, medium compressibili
medium bearing values, and basement seepage is a common problem.
When used for streets and low-cost roads, they have a moderate shrink -swell
tential, moderate susceptibility to frost action, moderately fine textured
soil, and are found on gently sloping to steep topography. on slopes over 9
the limitation becomes severe because of deep cuts and fills. The road mair
ance problems also increase as the slope increases, especially from erosion
seepage.
Cw Cordova -Webster silty clay loam
Ge Glencoe silty clay loam
Very poorly drained ciay loam and silty clay loam soils. These medium textu
materials are commonly many feet thick. The subsoils are typically neutral.
They occupy 1 to 5 acre depressions and 5 to 40 acre long, winding, low grad
drainagemays. Commonly associated soils are the poorly drained Wehster soil
the sloping Lester and Hayden soils, and the peat and muck soils.
The major building site limitation is wetness. The Cordova soil is poorly d
and the Glencoe soil is very poorly drained and has a high seasonal water to
that ranges from near the surface to a depth of 3 to 5 feet.
When used as foundations for low buildings, they have a severe limitation: t
water table, medium to low shear strength and bearing values, moderate shrin
swell potential, and a medium compressibility.
When used for streets and low-cost roads, they have a high seasonal water to
are occasionally ponded, and have a high susceptibility to frost action, mod
shrink -swell potential, and a moderately fine texture.
Pm Peat and muck, moderately shallow over loam
Very poorly drained, moderately shallow organic materials (1 to 3k feet dee
over loam. They are neutral, very poorly drained, moderately permeable, hi
in organic matter with a high water holding capacity. They occur in slough
pot holes and drainageways.
The major building site limitations are frequent ponding and organic materi
that is very poorly drained with the water table near the surface.
When used as foundations for low buildings, they have unfavorable soil char
teristics, including organic soil that is very poorly drained and has a hig
water table.
When used for streets and low-cost roads, they have a low bearing capacity
the water table near the surface and an organic surface texture.
For additional soil information, see "Soil Survey - Carver County, Minnesot.
United States Department of Agriculture, Soil Conservation Service, November
1968.
The soil investigations, mapping and interpretations ordinarily apply to the
upper 5 to 6 feet of soil material. There should be additional onsite inve:
gation relating directly to the proposed uses before construction is startec
Attached; Development Plan With Soil Mapping Units Colored to Show Building
Site Limitations and Color Key