HomeMy WebLinkAboutPROSPECT GREENS PUD - PRELIMINARY - 15-95 - SUBMITTAL DOCUMENTS - ROUND 1 - GEOTECHNICAL (SOILS) REPORT4 .ltvan-Satanta loams, 3 to 9 percent a es. This
comv.ex consists of gently sloping or stronb sloping .
soils on high terraces, benches, and fans. It is about
55 percent Altvan loam and 35 percent Satanta loam.
Altvan loam is mainly more sloping, and Satanta loam
is smoother. These soils have profiles similar to the
ones described as representative of their respective
series, but the surface layer is sandy loam and loam
and the surface layer and subsoil are thinner. Many
areas of both soils are redder than is typical of their
respective series.
Included with these soils in mapping is about 10
percent Nunn and Larimer soils.
Runoff is medium to rapid, and the hazards of wind
and water erosion are moderate.
If irrigated, these soils are well suited to alfalfa,
small grain, and pasture. Under dryland management
they are suited to wheat and barley. They are also
suited to pasture and native grasses. Capability units
IVe-1, irrigated, and IVe-3, dryland; Loamy Foothill
range site; windbreak suitability group 1.
35—Fort Collins loam, 1 to 3 percent slopes. This
nearly level soil is on terraces and fans. This soil has a
profile similar to the one . described as representative
of the series, but the combined thickness of the surface
layer and subsoil is about 22 inches.
Included with this soil in mapping are a few small
areas of soils that are more sloping or less sloping. Also
included are some small areas of Stoneham and ICim
soils and a few small areas of soils that have a gravelly
layer below a depth of 40 inches.
Runoff is slow, and the hazards of wind and. water
erosion are slight to moderate.
If irrigated, this soil is well suited to corn, sugar
beets, alfalfa, barley, and dry beans. Under dryland
management it is suited to wheat and barley. It is also
well suited to pasture and native grasses. Capability
units IIe-1, irrigated, and IVe-3, dryland; Loamy
Plains range site; windbreak suitability group 1.
76—Nunn clay loam, wet, 1 to 3 percent slopes. This
nearly level somewhat poorly drained soil is on low
terraces and alluvial fans, commonly adjacent to
drainageways. This soil has a profile similar to the one
described as representative of the series, but a seasonal
high water table is at a depth of 20 to 30 inches during
part of the growing season.
Included with this soil in mapping are a few small
areas of soils that have a strongly alkaline surface
layer and a few small areas of soils that are moderately
well drained. Also included are a few areas of soils
that have a surface layer of loam or clay and a few
areas of soils that are less sloping.
Runoff is slow, and the hazard of erosion is slight.
This soil is suited to pasture and hay. If the water
table is lowered by management practices, corn, sugar
beets, wheat, and barley can be grown. Capability unit
IIIw-1, irrigated; Wet Meadow range site; windbreak
suitability group 5.
SOIL CONSERVATION SERVICE -SOIL GROUPING SCHEMATIC
PROSPECT GREENS P.U.D.
FORT COLLINS, COLORADO
PROJECT: 1952019 DATE: MARCH 1995
EARTH ENGINEERING CONSULTANTS
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EAST PROSPECT
SCS SOIL
TYPE 35
SCS SOIL
TYPE 4
SCS SOIL
TYPE 76
/ SEWER
APPROXIMATE
BOUNDARY
SOIL CONSERVATION SERVICE —SOIL GROUPING SCHEMATIC
PROSPECT GREENS P.U.D.
FORT COLLINS, COLORADO
PROJECT: 1952019 DATE: MARCH 1995
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APPROXIMATE SCALE
NONE
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Earth Engineering Consultants, Inc.
Prospect Greens P.U.D.
March 17, 1995
Page 2
table, if present, would indicate the site materials may be saturated so that those materials could
be used for direct support of footings and slabs -on -grade.
Based on our review of readily available site information, it is our opinion the in -place materials
could probably be used for support of lightly loaded structures. Special care and construction
procedures will likely be necessary in the south part of the site because of high ground water
and/or expansive soils.
The evaluation provided as a part of this project was based on review of readily available public
information on this site. The soils indicated may or may not actually exist on the site. An
intrusive geotechnical exploration would be required to evaluate actual site conditions.
We appreciate the opportunity to be of service to you on this project. If you have any questions
concerning this information, or if we can be of further service to you in any other way, please
do not hesitate to contact us.
Very truly yours,
rs, Inc.
Principal
March 17, 1995
Parsons & Associates, Inc.
432 Link Lane Plaza
Fort Collins, Colorado 80524
Attn: Mr. Gary Odehnal, P.E.
RE: Physiographic Site Data
Prospect Greens P.U.D.
Fort Collins, Colorado
EEC Project No. 1952019
Mr. Odehnal:
EARTH ENGINEERING
CONSULTANTS, INC.
This report presents the results of the physiographic evaluation you requested for the referenced
site. That evaluation was completed by reviewing readily available soil and ground water
conditions reported for the site, primarily through review of Soil Conservation Service (SCS)
site information and United States Geologic Survey published maps. Results of our evaluation
are provided in this report.
The proposed Prospect Greens P.U.D. will be located south of East Prospect and east of Stover
Street in Fort Collins, Colorado. The general location of the approximate 2-1/2 acre site is
shown on the attached diagram. Soil Conservation Service information outlining the approximate
soil types anticipated at this site is also shown on the attached diagram. A description of those
soil classifications is attached with this report.
The USGS map showing the expected depth to the water table in this area indicates the water
table would be expected at depths of 10 to 20 feet. The Soil Conservation Service information
indicates the depth to ground water in the south portion of the site, that portion designated as
soil type 76 on the attached diagram, indicates the depth to ground water might be on the order
of 1 1/2 to 2 1/2 feet.
Based on the USGS geologic map of this area, the near surface soils consist of Slocum
Alluvium. The specific soil groups shown on the Soil Conservation Service map include the
Fort Collins Series near the north end of the site, the Altvan Series in the center portion of the
site and the Nunn Series in the south 1/2 of the site. The Fort Collins and Altvan Series consist
of low plasticity lean clays with gravel or sand zones. Those materials could probably be used
for direct support of footings, floor slabs and pavements for the proposed development. The
Nunn Series consists of high plasticity clays with a potential for volume change with variation
in soil moisture content. Special construction procedures may be required in this area to develop
foundation and floor support for lightly loaded structures. However, the high ground water
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