HomeMy WebLinkAboutSWIFT ADDITION TO FOSSIL LAKE P.U.D. - COUNTY REFERRAL - 33-01(I) - SUBMITTAL DOCUMENTS - ROUND 1 - GEOTECHNICAL (SOILS) REPORT (3)--_------Form Road ---------�--
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l_OUIS SWIF-1 PARCEL @ FOSSIL CREEK ESTATES - LARIMER COUNTY, COLORADO
PROJECT NO: 1962023A DATE: MARCH 1999
EARTH ENGINEERING CONSULTANTS
EEC Project No. 1962023A
May 23, 2002
Page 4
REFERENCES
Earth Engineenng Consultants, Inc.
Colton R.B. and Harold R. Fitch, 1974, Map Showing Potential Sources of
Gravel and Crushed -Rock Aggregate, in the Boulder -Fort Collins-Greelev
Area. Front Range Urban Corridor, Colorado: U.S. Geological Survey
Miscellaneous Investigation Series Map I-855-D.
2. Colton R.B., Holligan, J.A., and Anderson, L.W., 1975, Preliminary Mao of
Landslide Deposits, Greelev 1°x2° Quadrangle, Colorado: U.S. Geological
Survey Miscellaneous Investigation Series Map MF-704.
3. McCain, J. and Hotchkiss, W.R., 1975, Map Showing Flood -Prone Areas,
Boulder -Fort Collins -Greeley Area, Front Range Urban Corridor. Colorado:
U.S. Geological Survey Miscellaneous Investigation Series Map I-855-E.
4. Colton R.B., 1978, Geologic Map of the Boulder -Fort Collins -Greeley Area.
Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map
I-955-G.
5. Hershey L.A. and Schneider, Jr. P.A., 1972, Geologic Map of the Lower
Cache La Poudre River Basin. North-Central Colorado: U.S. Geological
Survey Miscellaneous Investigation Series Map I-687.
6. Hillier D. and Schneider, Jr. P.A., 1979, Depth to the Water Table in the
Boulder -Fort Collins-Greelev Area. Front Range Urban Corridor. Colorado:
U.S. Geological Survey Miscellaneous Investigation Series Map I-855-1.
United States Department of Agriculture Soil Conservation Service and
Forest Service in Cooperation with Colorado Agricultural Experiment
Station, 1980, Soil Survev of Weld Countv Area. Colorado, Maps 239-812;"3.
Earth Engineering Consultants, Inc.
EEC Project No. 196202JA
May 23, 2002
Page 3
We appreciate the opportunity to be of service to you on this project. If you have any
questions or require additional information, please do not hesitate to contact us.
Very truly yours,
[nC.
Principal Engineer
LLLitjr
Earth Engineering Consultants, file.
EEC Project No. 196202JA
May 23, 2002
Page 2
The SCS information indicates high groundwater may be encountered in the Nunn (76) soil
grouping. The geologic map of the area indicates the remainder of the property would be
expected to have groundwater at depths of 10 to 20 feet. Groundwater was observed at
depths of 11 to 12%z feet in the soil borings completed in March of 1999.
According to the geologic maps of the area, the surficial soils at the site are wind deposited
eolean soils. The eolean materials overlie the Upper Member of the Pierre Shale bedrock
formation. The Upper Member of the Pierre Shale consists of silty shale layers. According
to SCS data, depth to bedrock is greater than 60 inches; bedrock was not observed in the site
test borings which extended to depths of approximately 15 feet.
Based on our review of the site as outlined above, we expect the near surface soils could be
used for support of lightly loaded residential structures. More heavily loaded structures may
require deep foundations. A majority of the near surface soils appear to exhibit a low
potential for volume change with variation in moisture content although higher swell
potential may be encountered in the Nunn soil grouping area. The depth to seasonal high
groundwater should be more closely evaluated in the Nunn (76) area of the site.
During our review of available site data, we did not identify other potential geologic hazards
as outlined in H.B. 1041. In addition, we do not anticipate economically recoverable mineral
resources as defined in H.B. 1041 exist at this site.
The evaluation for this report was based on a review of readily available public information
for the property and a review of four (4) soil borings completed on the 50= acre site. The
soils indicated may or may not exist across the site and a more extensive geotechnical
exploration should be completed to evaluate actual site conditions prior to design of the
proposed improvements.
N
FINAL SUBMIT -
AL
May 23, 2002 Is u0a 0
EARTH ENGINEERING
CONSULTANTS, INC.
Everitt Companies
3030 South College Avenue
P.O. Box 2125
Fort Collins, Colorado 80522
Attn: Mr. Jim Birdsall
Re: Geologic Hazards Evaluation
Louis Swift Parcel at Fossil Creek Estates
Larimer County, Colorado
EEC Project No. 1962023A
Mr. Birdsall:
Earth Engineering Consultants, Inc. (EEC) personnel have completed the geologic hazards
evaluation you requested for the referenced project. That evaluation was completed by
reviewing readily available data concerning soil and groundwater conditions at the site,
principally through review of United States Geologic Society (USGS)/Colorado Geologic
Society (CGS) and Department of Agriculture Soil Conservation Service (SCS) published
information. We have also reviewed our geotechnical subsurface exploration report for the
referenced site dated March 23, 1999. A listing of the published references reviewed as a part
of the geologic hazard study is included with this report.
Fossil Creek Estates is located in Section 9, T6N, R68W of the 6th P.M. in Larimer County,
Colorado. The development parcel includes approximately 400 acres. The Swift parcel
includes approximately 55 acres in the east'// of Section 9. Site drainage is to the south and
east with total elevation change across the site on the order of 10 feet. A diagram indicating
the approximate location of the development is included with this report.
The attached soil classification map includes demarcation of those soil groupings identified
on the site by SCS Larimer County soil maps. SCS descriptions of those soil types are
provided with this report. In general, the near surface soils at this site appear to be a blend
of low to moderate plasticity sandy clay loam with varying amounts of silt.
CENTRE FOR ADVANCED TECHNOLOGY
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FORT COLLINS, COLORADO 80526
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