HomeMy WebLinkAbout20123016.tiff SOILOGIC
October 24, 2011
AGPRofessionals, LLC
4350 Highway 66
Longmont, Colorado 80504
Attn: Mr. Tim Naylor
Re: Geology Report
Big Thompson Investment Holdings, LLC Parcel
Weld County, Colorado
Soilogic Project# 11-1089
Mr. Naylor:
Soilogic, Inc. (Soilogic) personnel have completed the geologic evaluation you requested
for the above referenced project. Our evaluation was completed through review of
mapped and published information concerning site soil and groundwater conditions. A
list of the references reviewed is included with this report.
The subject property includes a total of approximately 113 acres located in the West Yz of
Section 23, Township 4 North, Range 66 West of the 6' Principal Meridian in Weld
County, Colorado to be rezoned as industrial. The property is located southeast of the
intersection of Weld County Roads 33 and 44. The site is sloping to the east, southeast
with the maximum difference in ground surface elevation across the site estimated to be
less than 20 feet.
The included soil type delineation diagram outlines those soil groupings identified at the
site by Weld County Soil Conservation Service (SCS) maps. SCS descriptions of those
soil types are included with this report. In general, the near surface soils at this site
appear to consist of low to moderately plastic sandy loam from the Bresser, Julesburg and
Otero series. The mapped soils consist of Pinedale and Bull Lake Age alluvium from
upper Pleistocene geologic period. Mapped information indicates the property is not in
an area identified as being flood prone and would be expected to have groundwater at
depths ranging from approximately 10 to 20 below ground surface. Longer term
observation of site groundwater levels in wells which are cased and sealed from the
influence of surface water would be required to better define seasonal high groundwater
levels and possible fluctuations in those levels over time.
Soilogic, Inc.
4350 Highway 66 • Longmont, CO 80504 • (970)674-3430
P.O. Box 1121 • Hayden, CO 81639 • (970)276-2087
Big Thompson Mx ostmcnt iloldim_s. I_i_C Parcel
Weld County. Colorado
•
Soilogic -- I I-I0S9
According to geologic maps of the area, the site overburden soils are underlain 1w both
the Laramie formation consisting of shale. claystone and sandstone and the Fox Hills
Sandstone formation from the upper cretaceous period. According to SCS data, the depth
to bedrock would be expected to be greater than 5 feet across the site.
Based on our review of the site as outlined above. we expect the near surface soils could
be used for support of lightly to moderately loaded industrial structures. Deep foundation
systems could be employed it heavy foundation loads are anticipated. The site soils
would be expected to exhibit percolation rates supporting conventional septic system
construction. Site specific percolation testing would be required to better evaluate the
percolation rate of near surface soils and depth to bedrock and groundwater in septic
absorption field areas. Engineered septic systems would he required for industrial
treatment applications.
During our reviey: of available site data, we did not identify other potential geologic
hazards as outlined in H.B. 1041. In addition. we did not identify economically
recover able gravel resources at this site.
We appreciate the opportunity to be of service to you on this project. If we can be of
further service to you in any way or if you have any questions concerning the enclosed
information, please do not hesitate to contact us.
Very Truly Yours,
Soilogic, Inc.
Poo REG/ �1
6s \ION 4' ,.FIll
4U . 4
N Jet.
,I SS/ONA ENS
Wolf von Carlowitz, P.E.
Principal Engineer
Big Thompson Investment Holdines. LLC Parcel
VVeld County. Colorado
Soiloaic I I-1089
REFERENCES
1. Colton R.B. and Harold R. Fitch, 1974. Map Showing Potential Sources of Gravel
and Crushed-Rock Aggregate. in the Boulder-Fort Collins-Greeley Area, Front Range
Urban Corridor. Colorado: U.S. Geological Survey Miscellaneous Investigation
Series Map I-855-D.
2. Colton R.B., 1978, Geologic Map of the Boulder-Fort Collins-Greeley Area,
Colorado: U.S. Geological Survey Miscellaneous Investigation Series Map 1-955-G.
3. 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 1-687.
4. I illier D. and Schneider, Jr. P.A.. 1979. Depth to the Water Table in the Boulder-Fort
Collins-Greeley Area, Front Range Urban Corridor. Colorado: U.S. Geological
Survey Miscellaneous Investigation Series Map 1-855-L
5. United States Department of Agriculture Soil. Conservation Service and Forest
Service in Cooperation with Colorado Agricultural Experiment Station, 1980, Soil
Survey of Weld County Area. Colorado, Maps 239-813/3.
6. Schneider, Jr. P. A., 1983 Shallow Groundwater in the Boulder-Fort Collins-Greeley
Area, Front Range Urban Corridor, Colorado 1975-77: U.S. Geological Surey
Water Resources Investigations Report 83-4058.
7. Soil Survey Staff, Natural Resources Conservation Service, United States Department
of Agriculture. Web Soil Survey. Available online at
http://wehsoilsur ey.nres.usda.gov/ accessed (October 20, 2011).
Soil Map—Weld County,Colorado,Southern Part
(Big Thompson Investment Holdings,LLC)
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Soil Map—'Held County. Colorado.Southern Part Big Thompson Investment Holdings.LLC
Map Unit Legend
Weld County,Colorado,Southern Part(CO618)
Map Unit Symbol I Map Unit Name I Acres in AOI I Percent of AOI
11 Bresser sandy loam.0 to 1 percent slopes 39.6 34.2%
12 Bresser sandy loam. 1 to 3 percent slopes 30.2 26.0%
30 Julesburg sandy loam. 1 to 3 percent 45.6 39.4%
slopes
5l ULeio Shc idy luau'. i to 3 percent slupcs 0.4 5.3%
Totals for Area of Interest 115.8 100.0%
USDA Natural Resources Web Soil Survey 10/19/2011
a Conservation Service National Cooperative Soil Survey Page 3 of 3
Map Unit Description:Bresser sandy loam.0 to 1 percent slopes—Weld County. Big Thompson Investment Holdings.LLC
Colorado Southern Part
Weld County, Colorado, Southern Part
11—Bresser sandy loam, 0 to 1 percent slopes
Map Unit Setting
Elevation: 4.700 to 4,800 feet
Mean annual precipitation: 12 to 15 inches
Mean annual air temperature:46 to 52 degrees F
Frost-free period: 135 to 155 days
Map Unit Composition
Bresser and similar soils: 90 percent
Minor components: 19 percent
Description of Bresser
Setting
Landform:Terraces
Down-slope shape: Linear
Across-slope shape: Linear
Parent material:Alluvium
Properties and qualities
Slope: 0 to 1 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Capacity of the most limiting layer to transmit water
(Ksat): Moderately high to high (0.57 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 10 percent
Available water capacity: Low(about 6.0 inches)
Interpretive groups
Land capability classification (irrigated): 2s
Land capability(nonirrigated):4c
Ecological site: Sandy Plains (R067BY024CO)
Typical profile
0 to 16 inches: Sandy loam
16 to 25 inches: Sandy clay loam
25 to 30 inches: Sandy loam
30 to 60 inches: Loamy sand
>p� Natural Resources Web Soil Survey 10/19/2011
Conservation Service National Cooperative Soil Survey Page 1 of 2
Map Unit Description Bresser sandy loam.0 to 1 percent slopes—Weld County. Big Thompson Investment Holdings.LLC
Colorado.Southern Part
Minor Components
Ascalon
Percent of map unit: 10 percent
Data Source Information
Soil Survey Area: Weld County, Colorado, Southern Part
Survey Area Data: Version 11, Aug 27, 2009
S_L Natural Resources Web Soil Survey 10/19/2011
Ice2' Conservation Service National Cooperative Soil Survey Page 2 of 2
Map Unit Description:Bresser sandy loam,1 to 3 percent slopes—Weld County. Big Thompson Investment Holdings.LLC
Colorado,Southern Pan
Weld County, Colorado, Southern Part
12—Bresser sandy loam, 1 to 3 percent slopes
Map Unit Setting
Elevation:4.700 to 4,800 feet
Mean annual precipitation: 12 to 15 inches
Mean annual air temperature:46 to 52 degrees F
Frost-free period: 135 to 155 days
Map Unit Composition
Bresser and similar soils: 90 percent
Minor components: 10 percent
Description of Bresser
Setting
Landform: Terraces
Down-slope shape: Linear
Across-slope shape: Linear
Parent material:Alluvium
Properties and qualities
Slope: 1 to 3 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Capacity of the most limiting layer to transmit water
(Ksat): Moderately high to high (0.57 to 2.00 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 10 percent
Available water capacity: Low (about 6.0 inches)
Interpretive groups
Land capability classification (irrigated): 2e
Land capability(nonirrigated): 4c
Ecological site: Sandy Plains (R067BY024CO)
Typical profile
0 to 16 inches: Sandy loam
16 to 25 inches: Sandy clay loam
25 to 30 inches: Sandy loam
30 to 60 inches: Loamy sand
Minor Components
Ascalon
Percent of map unit: 5 percent
!5UA Natural Resources Web Soil Survey 10/19/2011
sua Conservation Service National Cooperative Soil Survey Page 1 of 2
Map Unit Description:Presser sandy loam, 1 to 3 percent slopes—Weld County. Big Thompson Investment Holdings.LLC
Colorado.Southern Part
Vona
Percent of map unit: 5 percent
Data Source Information
Soil Survey Area: Weld County, Colorado, Southern Part
Survey Area Data: Version 11, Aug 27, 2009
l?I>\ Natural Resources Web Soil Survey 10/19/2011
"ea Conservation Service National Cooperative Soil Survey Page 2 of 2
Map Unit Description:Julesburg sandy loam. 1 to 3 percent slopes—Weld Big Thompson Investment Holdings LLC
County. Colorado.Southern Part
Weld County, Colorado, Southern Part
30—Julesburg sandy loam, 1 to 3 percent slopes
Map Unit Setting
Elevation: 4.700 to 4,800 feet
Mean annual precipitation: 15 to 19 inches
Mean annual air temperature:48 to 52 degrees F
Frost-free period: 145 to 155 days
Map Unit Composition
Julesburg and similar soils: 90 percent
Minor components: 10 percent
Description of Julesburg
Setting
Lam/form: Terraces
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: South platte river alluvium
Properties and qualities
Slope: 1 to 3 percent
Depth to restrictive feature: More than 80 Inches
Drainage class: Well drained
Capacity of the most limiting layer to transmit water(Ksat): High(2.00
to 6.00 in/hr)
Depth to water table. More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water capacity: Moderate (about 6.5 inches)
Interpretive groups
Land capability classification (irrigated): 2e
Land capability(nonirrigated): 3e
Ecological site: Sandy Plains (R067BY024CO)
Typical profile
0 to 12 inches: Sandy loam
12 to 27 inches: Sandy loam
27 to 60 inches: Sand
Minor Components
Valent
Percent of map unit: 5 percent
i H?\ Natural Resources Web Soil Survey 10/19/2011
c.4 Conservation Service National Cooperative Soil Survey Page 1 of 2
Map Unit Description:Julesburg sandy loam. 1 to 3 percent slopes—Weld Big Thompson Investment Holdings.LLC
County.Colorado,Southern Part
Remmit
Percent of map unit: 5 percent
Data Source Information
Soil Survey Area: Weld County, Colorado. Southern Part
Survey Area Data: Version 11, Aug 27, 2009
t',co% Natural Resources Web Soil Survey 10/19/2011
i°= Conservation Service National Cooperative Soil Survey Page 2 of 2
Map Unit Description:Otero sandy loam. 1 to 3 percent slopes—Weld County, Big Thompson Investment Holdings.LLC
Colorado.Southern Part
Weld County, Colorado, Southern Part
51—Otero sandy loam, 1 to 3 percent slopes
Map Unit Setting
Elevation: 4.700 to 5.250 feet
Mean annual precipitation: 12 to 15 inches
Mean annual air temperature: 48 to 52 degrees F
Frost-free period: 130 to 180 days
Map Unit Composition
Otero and similar soils: 85 percent
Minor components: 15 percent
Description of Otero
Setting
Landform: Plains
Down-slope shape: Linear
Across-slope shape: Linear
Parent material: Eolian deposits and/or mixed outwash
Properties and qualities
Slope: 1 to 3 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Well drained
Capacity of the most limiting layer to transmit water
(Ksat): Moderately high to high (0.57 to 5.95 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 10 percent
Maximum salinity: Nonsaline to very slightly saline(0.0 to 4.0 mmhos/
cm)
Available water capacity: Moderate (about 7.7 inches)
Interpretive groups
Land capability classification (irrigated): 3e
Land capability(nonirrigated):4e
Ecological site. Sandy Plains (R067BY024CO)
Typical profile
0 to 12 inches: Sandy loam
12 tc 60 inches: Fine sandy loam
Minor Components
Kim
Percent of map unit: 10 percent
t',,!1'% Natural Resources Web Soil Survey 10/19/2011
Conservation Service National Cooperative Soil Survey Page 1 of 2
STATE OF COLORADO
COLORADO GEOLOGICAL SURVEY Na
tural of Natural Resources
1313 Sherman Street, Room 715
Denver, Colorado 80203
Phone 303.866.2611
Fax 303.866.2461
DEPARTMENT OF
NATURAL
RESOURCES
John July 2, 2012 Governor
Hickenlooper
Mike King
Tom Parko Approximate location: Executive Director
Weld County Planning Services NW% Section 23, Vincent Matthews
Division Director and
1555 N. 17th Ave. T4N, R66W State Geologist
Greeley, CO 80631 of the 6t1 P.M.
Subject: Review of Big Thompson Investment Holdings, LLC
Case No. MINK12-0007; Weld County,CO; CGS Unique No. WE-12-0016
Dear Mr. Parko:
Colorado Geological Survey has completed its site visit and review of the above-referenced proposed
subdivision. I understand the applicant proposes to subdivide a 92-acre parcel into 8 industrial lots and
several outlots. With this referral,I received a Geology Report(Soilogic, October 24, 2011), a copy of the
Minor Subdivision Sketch Plan Application(signed May 31, 2012), and a Sketch Plan Map and Sketch
Plan Vicinity Map(AgPro, May 1, 2012). I have several comments:
Geologic hazards and geotechnical constraints. I agree with Soilogic that the site does not contain any
geologic or geotechnical conditions which would preclude the proposed industrial subdivision. A site-
specific geotechnical investigation will be needed, once development plans are known on each lot, to
determine engineering parameters such as soil strength,bearing capacity, swell and consolidation potential
and groundwater levels. This information is needed to design building foundations, floors,pavements and
sewage disposal systems, to determine the need for foundation drains, to specify compaction requirements,
and to determine whether below-grade space is feasible, if planned. According to the Weld County Sol
Survey, most of the site soils present a moderate risk of corrosion to steel. All buried steel(pipelines, etc.)
that will be in contact with site soils should be epoxy-coated to prevent corrosion.
Tank batteries and oil/gas wells. The site contains at least five oil/gas wells and four tank batteries. A
gas well is located in the center of the northernmost 9-acre lot(most of the proposed lots are not labeled on
the Sketch Plan). It would be prudent, on at least this lot, to identify a building envelope that specifically
excludes the 150 ft. setback radius.
Thank you for the opportunity to review and comment on this project. If you have questions or need
clarification of issues identified during this review,please call me at(303) 866-2611 ext. 8316, or e-mail
jill.carlson@state.co.us.
incerely,���
ill arlson, C.E.G.
ngmeermg eo ogist
W E-12-0016_I Big Thompson Investment Holdings
2:11 PM,07/02/2012
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