HomeMy WebLinkAbout20031691 Todd Hodges Design, LLC
Soil Survey of Weld County, Colorado excerpt (Southern Portion)
Published by the United States Department of Agriculture Soil Conservation Service
In Cooperation with Colorado Agricultural Experiment Station
Issued September 1980
Stamp Minor Subdivision
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2-112 Penh! ("mot • fort Collins. Colorado 80526 • (9-O 20 02.2 • fax: (?07)828-8059
email: toddhodgestlesign(a earthlinA net
2003-1691
Todd Hodges Design, LLC
Soil Survey of Weld County, Colorado excerpt (Southern Portion)
Published by the United States Department of Agriculture
Soil Conservation Service
In Cooperation with Colorado Agricultural Experiment Station
Issued September 1980
Soil Classification#42: Nunn Clay Loam, 1 to 3 percent slopes
42—Nunn clay loam, 1 to 3 percent slopes. This ix a
The potential native vegetation is dominated by
deep, well drained soil on terraces and smooth plains at
western wheatgrass and blue grams. RuKalogniss is also
elevations of 4,5511 to 5,150 feet. it formed in mixed allu- present. Potential production ranges from 1,000 pounds
vium and eolian deposits. Included in mapping are small, per acre in favorable years to 600 pounds in unfavorable
long and narrow areas of sand and gravel deposits and years. As range condition deteriorates,a blue grams-buf-
small areas of soils that are subject to occasional flooding. falograse: sod forms. Undesirable weeds and annuals in-
Some leveled areas are also included. vade the site as range condition becomes poorer.
Typically the surface layer of thin Nunn soil is grayish Management of vegetation of this nail should be based
brown clay loam aobut 9 inches thick.The subsoil is light on taking half and leaving half of the total annual produc-
brownish gray clay loam about 14 inches thick The upper tan_ Range pitting can help in reducing runoff.Seeding is
part of the substratum is light brownish gray clay loam. desirable if the range is in poor condition. Western
The lower part to a depth of 60 inches is brown sandy wheatgrass,blue grams,sideoats grams, buffalograsa,pu-
learn. bescent wheatgrass, and crested wheats-rasa are suitable
Permeability is moderately slow. Available water for seeding. The grass selected should meet the seasonal
capacity is high. The effective rooting depth is 60 inches requirements of livestock. It can be seeded into a clean,
or more. Surface runoff is medium, and the erosion firm sorghum stubble, or it can be drilled into a firm
hazard is low. prepared seedhevl. Seeding early in spring has proven
In irrigated areas this soil is suited to all crops erom- most successful.
moody grown in the area, including corn, sugar beets, Windbreaks and environmental plantings are generally
beans, alfalfa, small grain, potatoes,and onions. An exam- well suited to this soil. Cultivation to control competing
ple of a suitable cropping system is 3to 4 years of alfalfa vegetation should be continued for as many years as
followed by corn, corn for silage, sugar beets, small grain, possible following planting.Trees that are beat suited and
or beans. Generally such characteristics as the high clay
have good survival are Rocky Mountain juniper, eastern
content or the rapidly permeable substratum slightly redcedar,ponderosa pine,Siberian tuiearelm, Russian-0live,and
restrict some crisps- hackbe•rry.The shrubs best suited are skunkbush sumac,
All methods of irrigation are suitable, but furrow ir- lilac.Siberian peashrub,and American plum.
rigation is the must common. Proper irrigation water Wland is an important secondary use• of thin soil.Theed
management is essential. Barnyard manure and coann ier cropland areas provide favorable habitat fur ring-tacked
cial fertilizer are needed for top yields. pheasant and mourning dove. Many nongame species can
be attracted by establishing areas for nesting and escape
In nonirrigated areas most of the acreage is in small
gratin and it is summer fallowed in alternate years. cover. For pheasants, undisturbed nesting cover is easen-
Winter wheat is the principal crop.The predicted average tial and should be included in plans for habitat develop
is 33 bushels ment, especially in areas of intensive agriculture. Range-
yield per acre. If the crop is winterkilled, land wildlife, for example, the pronghorn antelope,can be
spring wheat ran he seeded.Generally precipitation is too attracted by developing livestock watering facilities.
low for beneficial use of fertilizer. managing livestock grazing,and reseeding when` needed.
Stubble mulch fanning.atriperopping,and minimum til- This soil has fair to poor potential for urban develop.
lage are needed to control soil blowing and water erosion. ment. It has moderate to high shrink swell, low strength,
and moderately slow permeability. These features create
problems in dwelling and road construction. Those areas
that have loam or sandy loam in the lower part of the
substratum are suitable for septic tank absorption fields
and foundations. Some areas of this soil are adjacent to
streams and are subject to occasional flooding.The poten-
tial is fair for such recreational development as camp and
picnic areas and playgrounds. Capability subclass Its ir-
rigated,Ilk nonirrigated;Clayey Plains range site.
2412 Denby Court • Fort Collins, Colorado 80526 • (970) 207-0272 • fax: (561)828-8059
email: toddhodgesdesign(aearthlink.net
_ I
Todd Hodges Design, LLC
Soil Survey of Weld County, Colorado excerpt (Southern Portion)
Published by the United States Department of Agriculture Soil Conservation Service
In Cooperation with Colorado Agricultural Experiment Station, Issued 9/1980
Soil Classification #82: Wiley-Colby complex, 1 to 3 percent slopes
K2—Wiley-Colby complex, t to 3 percent slopes. This
nearly level map unit is on smooth plains in the western Management of vegetation on this soil should he based
part of the survey area at elevations of 4,tt60 to 5,000 on hiking half and leaving half of the total annual produc-
feet. The Wiley soil makes up about 60 percent of the tion.Seeding is desirable if the range is in poor condition.
unit, and the Colby soil about 30 percent. About 10 per- Sideoats grama.little bluestem,western wheatgrass,blue
cent is Heldt silty day and Weld loam. grams,pubescent wheatgras.s,and created wheatgrass are
The Wiley moil is deep and well drained. It. formed in suitable tier seeding. The grass selected should meet the
calcareous eolian deposits. Typically the surface layer is seasonal requirements of livestock. It can he seeded into
pale brown silt loam about 11 Inches thick.The subsoil is a clean. firm sorghum stubble or it can be drilled into a
pale brown silty clay loam about 23 inches thick.The sub- firm prepared seedbed. Seeding early in spring ham
stratum to a depth of 60 inches is very pale brown silty proven most successful.
clay loam. Windbreaks and environmental plantings are generally
Permeability is moderately slow. Available water well suited to these soils. Cultivation to control competing
capacity is high.The effective rooting depth is 60 inches vegetation should be continued for as many years as
or more. Surface runoff is medium, and the erosion possible following planting.Trees that are hest suited and
hazard is moderate. have good survival are Rocky Mountain juniper, eastern
The Colby soil also is deep and well drained and formed redcedar ponderosa pine•Siberian elm. Russian-olive,and
in calcareous eolian deposits. Typically the surface layer
is pale brown loam about 7 inches thick. The underlying hlac.Siberry.ian
The shrubs best suited American are skunkbumh sumac,
material is very pale brown silt loam to a depth of 60 setae,Siberian peaahrub,and plum.
inches Openland wildlife, such as pheasant. mourning dove,
Permeability is moderate. Available water capacity is and cottontail are beat suited to these soils. Wildlife
high. The effective rooting depth is 60 inches or more. habitat development, including tree and shrub plantings
Surface runoff is medium, and the erosion hazard is and grass plantings to serve as nesting areas, should be
rnealerate successful without irrigation during most years. Under ir-
This map unit is used fur irrigated and nonirrigated rigatian,good wildlife habitat can be established, benefit-
repland and for rangeland, wildlife habitat, and urban ing many kinds of openland wildlife.
development. The Wiley soil has only fair potential for urban and
In irrigated areas these soils are suited to all crops recreational development Slow permeability, moderate
eemmonly grown in the area, including corn,sugar beets, ahrink-swell potential,and limited bearing capacity cause
beaus, alfalfa, small grain, and onions. An example of a problems in dwelling and road construction The Colby
suitable cropping system is ;b to 4 years of alfalfa fol- soil has good potential for urban and recreational develop-
lowed by corn,corn for silage.sugar beets,.mall grain,or ment Road design can be modified to compensate for the
beans. Land leveling,ditch lining, and installing pipelines limited rapacity of this soil to support it load. Capability
may be needed for proper water applications. subclass Ile irrigated, I Ve nonirrigated; Loamy Plains
All methods of irrigation are suitable, but furrow ir- range site.
rigation is the matt common. Barnyard manure and coon-
mercial fertilizer are needed for top yickls-
In nonirrigated arena these soils are suited to winter
wheat, barley, and sorghum. Most of the acreage is
planted to winter wheat. The predicted average yield is
28 bushels per acre. The soil is summer followed in al-
ternate years to allow moisture accumulation. Generally
precipitation ix too low for beneficial use of fertiliser.
Stubble mulch fanning,striperopping,and minimum til-
lage are needed to control soil blowing and water erosion.
Terracing also may be needed to control water erosion.
The potential native vegetation is dominated by blue
grams. Several mid grasses such as western wheatgraaa
and needleandthread are also present. Potential produc-
tion ranges from 1,600 pounds per acre in favorable years
to 1,000 pounds in unfavorable years. As range condition
deteriorates, the mid grasses decrease; blue grams, buf-
falograss, snakeweed, yucca and fringed sage increase;
and forage production drops Undesirable weeds and an-
nuals invade the site as range condition becomes poorer.
2412 Denby Court • Fort Collins, Colorado 80526 • (970) 207-0272 • fax: (561)828-8059
email: toddh odgesdesign('earth link net
(Th
Todd Hodges Design, LLC
Soil Survey of Weld County, Colorado excerpt (Southern Portion)
Published by the United States Department of Agriculture Soil Conservation Service
In Cooperation with Colorado Agricultural Experiment Station, Issued 9/1980
Soil Classification#83: Wiley Colby complex, 3 to 5 percent slopes
63 Wiley-Colby complex.3 to 5 percent slopes.This This unit is used fur irrigated and nonirrigated
gently sloping map unit is on plains at elevaiiona of 4,850 cropland and for rangeland. wildlife habitat. and urban
to 5,0110 feet.The Wiley soil makes up about f0 percent of development,
the unit, and the Colby soil about 30 percent. About 10 In irrigated areas these soils are suited to the crops
percent is Heidi silty day and Weld loam. commonly grown in the area- Perennial gr 'a and alfal-
The Wiley soil is deep and well drained. It formed in fir or close grown crepe should he grown at least 50 per-
calcareous eolian deposits. Typically the surface layer in cent of the time.Contour ditches and corrugations can be
pale brown silt loam about I1 inches thick.The subsoil is used in irrigating close grown crops and pasture. Fur
pale brown silty day loam about 23 inches cluck.The sub- rows,contour furrows, and cruise slope furrows are suite-
stratum to a depth of 60 inches is very pale brown silty hl• for row crops. Sprinkler irrigation is also desirable.
day loam, Keeping till
Permeability is moderately slow. Available water P K control to a minimum and utilizing crop ortdur
capacity is high.The effective rooting depth is 60 inches help to erosion. Maintaining fertility is important.
or more Surface runoff is medium to rapid,and the ero (:cops respond to applications ofa phosphorus and nitrogen.
sion hazard is moderate. In nonirrigated areas these soils are suited to winter
wheat
The Colby soil also is deep and well drained and formed barley, and sorghum. Most of the acreage is
planted to in cakareous eolian deposits. Typically the surface layer winter wheat. The is sums average yield is
is pale brown loam about 7 inches thick.The underlying '� bushels per acne. The sod trmmer fallowrd in al-
material is very pale brown silt loam to a depth of 80 ternate years to allow moisture accumulation. Generally
precipitation is tow low for beneficial use of fertilizer.
inches.
Permeability is moderate- Available water capacity is Stubble mulch farming,stripcmpping,and minimum til-
high. The effective rooting depth is 60 inches or more. lage are needed to control soil blowing and water erosion.
Surface runoff is medium to rapid,and the erosion hazard Terracing also may be needed to control water erosion.
is moderate The potential native vegetation ix dominated by blue
grams.Several mid grasses,such as western wheatgrass
and needlearalthrcasl, are also present. Potential produc-
tion ranges from 1,600 pounds per acre in favorable years
to 1,tllll) pounds in unfavorable years. As range condition
deteriorates, the mid greases decrease; blue grans, huf.
falograss, snakeweed, yucca, and fringed sage increases
and forage production drupe. Undesirable weeds and an-
\, nuals invade the site as range condition becomes poorer.
[ Management of vegetation on these soils should be
basest nn taking half and leaving half of the total annual
production. Seeding is desirable if the range is in poor
condition.Slleoets grams,little bluestem, western wheat-
grass, blue grains, pubescent wheatgrass, and crested
wheats'-Ras are suitable for seeding. The grass selected
should meet the seasonal requirements of livestock. It ran
he seeded into a clean, firm sorghum stubble,or it can he
drilled into a firm prepared seedbed. Seeding early in
spring has proven most successful.
Windbreaks and environmental plantings of trees and
shrubs commonly grown in the area are generally well
suited to these soils. Cultivation to control competing
vegetation should he continued for as many years as
possible following plantings. Trees that are hest suited
and have good survival are Rocky Mountain juniper,east-
ern redcedar, ponderosa pine,Siberian elm, Russian-olive,
and hackberry. The shrubs best suited are ekunkhush
sumac,lilac,Siberian peashrub,and American plum.
Openland wildlife, such as pheasant, mourning dove,
and cottontail, are best suited to these soils. Wildlife
habitat development, including tree and shrub plantings
and grass plantings to serve as nesting areas, should be
successful without irrigation during moat yearn Under ir-
rigation,good wildlife habitat can be established, benefit-
ing many kinds of openland wildlife.
The Wiley soil has only fair potential for urban and
recreational development. Slow permeability, moderate
shrink-swell potential,and limited bearing capacity cause
problems in dwelling and road construction. The Colby
soil has good potential for urban and recreational develop-
ments. Road design can be modified to compensate for
the limited capacity of this soil to support a load. Capa-
bility subclass life irrigated, We nonirrigated; Loamy
Plains range site.
2412 Denby Court • Fort Collins, Colorado 80526 • (970) 207-0272 • fax: (561)828-8059
email: toddhodgesdesign(aearthlink.net
'" CHURCH & Associates, Inc.
ENGINEERS & GEOLOGISTS
ENGINEERING GEOLOGY REPORT FOR
STAMP MINOR SUBDIVISION
SW 1/4 OF SECTION 36,
• TOWNSHIP 4 NORTH, RANGE 68 WEST OF THE 6Th P.M. •
WELD COUNTY, COLORADO
Prepared for:
JEFF STAMP
P.O. BOX 1198
LONGMONT, COLORADO 80502
JOB NO. 13896-L JULY 10, 2002
DENVER 4501 Wadsworth Boulevard Wheat Ridge,CO 80033 CASTLE ROCK 303 660 4358
303.463.9317 Fax:303.463.9321 EVERGREEN 303 816 1455
LOVELAND 970.663.2124
TABLE OF CONTENTS
SCOPE
I
PROPOSED DEVELOPMENT 1
SITE CONDITIONS 1
INVESTIGATION 1
SITE GEOLOGY 2
MINERAL RESOURCES 3
GEOLOGIC HAZARDS 3
GEOLOGIC IMPACTS ON DEVELOPMENT 3
LIMITATIONS 4
LIST OF REFERENCES 6
FIGURE 1 -VICINITY MAP
FIGURE 2 -SITE PLAN, LOCATION OF EXPLORATORY BORINGS
FIGURE 3 -AREA GEOLOGY
FIGURE 4 -MAP OF SAND, GRAVEL AND QUARRY AGGREGATE RESOURCES
FIGURE 5-SOIL SURVEY MAP
FIGURES 6&7-LOGS OF EXPLORATORY BORINGS
FIGURES 8-10-SWELL-CONSOLIDATION TEST RESULTS
SCOPE
As requested, we have conducted this engineering geology report for the subject site. The purpose
of our investigation was to identify site conditions regarding area suitability for the proposed development
as requested by the Weld County Planning Department.
PROPOSED DEVELOPMENT
The 58±-acre parcel is located in part of the Southwest Quarter of Section 36,T. 4 N.,R. 68 W. of
the 6th P.M. It is proposed to divide the parcel into 9 rural-residential lots, ranging in size from
approximately 2.5 acres to 16.21 acres, as presented on Figure 2. An existing roadway is to be realigned
and improved to service the lots. Domestic water is to be supplied by a local water district. Sewer services
are to be constructed on-site for each individual residence.
SITE CONDITIONS
The site is located southwest of Johnstown approximately '/: mile west of County Road 13 on the
north side of County Road 38. The subject site consists of irrigated ground that was recently harvested for
hay. Slope conditions range from 2% to 4% throughout most of the property to 10% to 12% near the
northeast section of the property. Existing drainage is directed primarily towards the drainage to the east
and southeast. An existing farmhouse, barn and riding arena are located on the future 16.21-acre lot. No
oil and gas wells were observed on this property but are located in the general vicinity.
INVESTIGATION
This investigation was conducted by means of a site reconnaissance, test hole observations and
percolation tests conducted on June 20 and 25, 2002 by the author of this report, a Professional Geologist
as defined under House Bill 1574. Readily available maps and literature by the Colorado Geological
Survey and US Geological Survey were also reviewed for this preliminary evaluation. Refer to the
Engineering Geology Report
Job No. 13896-L
Page 2
attached List of References.
SITE GEOLOGY
The area lies along the east fringe of the Colorado Piedmont Section of the Great Plains
Physiographic Province. The Colorado Piedmont is an elongated trough situated adjacent to the Front
Range. As mountain uplifting occurred in Laramide times, increased stream energies at the foot of the
mountains resulting in erosion and scouring, creating the Piedmont. The site also lies in the Denver Basin,
a thick accumulation of Mesozoic sediments,which have been producers of fossil fuels.
Surficial soils encountered in the test holes consist of silty clay and clayey silt with sand. The clay
and silt were encountered to 8 feet to 12 feet as presented on Figures 6 and 7. The soil is slightly moist to
moist having low swelling characteristics as presented on Figures 8, 9 and 10. The referenced geologic
map indicates the soils are eolium (Qe) of Quaternary age. The map describes eolium as silt, sand and
clay deposited by wind. The Soil Conservation Service (SCS) maps indicate 2 general soil types; the
Nunn clay loam and the Wiley-Colby complex. The Nunn clay loam is mixed alluvium (water deposited)
and eolian(wind) deposits. The Wiley-Colby complex is eolian and appears to be the dominant soil type.
The tables for the Nunn clay loam suggest moderate limitations for building site development due to low
strengths and shrink-swell and severe limitations for septic tank/absorption fields due to slow percolation.
The tables for the Wiley-Colby complex suggest slight limitations for building site development and
' moderate limitations for septic tank/absorption fields.
Weathered and unweathered siltstone with sand of the Upper Transition Member of the Pierre
Shale (Kptz) were encountered in all test holes, underlying the surficial soils. The Kptz has been
described on the referenced geologic maps as consisting of sandstone and shaly sandstone. Laboratory
tests indicate the siltstone exhibits a low swell potential when wetted. No faults were delineated on the
property.
Engineering Geology Report
Job No. 13896-L
Page 3
No free groundwater was encountered in the test holes. No evidence of a maximum seasonal
groundwater level was observed. Perched water tables can form over underlying rock formations when
water sources become available.
MINERAL RESOURCES
Colorado Geological Survey(CGS) Special Publication 5-B and the referenced geologic map and
the test hole data from this report were reviewed as the primary references for the preliminary evaluation
of sand, gravel and quarry aggregate resources and field verified by the geologist. The geologic map, CGS
publication and our test hole observations indicate no sand, gravel or aggregate resources underlie the site
presented on Figures 4, 6 and 7. Due to the lack of aggregate resources encountered and availability of
quality resources nearby, it is our opinion that this property is not economical for commercial extraction
of sand, gravel or quarry aggregate. No oil/gas wells were observed on this and adjacent properties,
however, oil/gas facilities exist in the area. The scope of our evaluations do not include the potential for
fossil fuel extraction.
GEOLOGIC HAZARDS
No maps indicating geologic hazards were readily available for the property. Our reconnaissance
did not reveal existing conditions, which would be conducive to geologic hazards. No underground
coalmines or other underground workings are known to exist at the property. Based on this information, it
is our opinion that there are no significant geologic hazards caused by gravity on the property. Man-made
activities, such as deep excavations, may create conditions which could result in gravity-caused geologic
hazards.
GEOLOGIC IMPACTS ON DEVELOPMENT
The interaction of the proposed development and the geology of the site will depend on the
Engineering Geology Report
Job No. I3896-L
Page 4
types of structures proposed and specific geologic influences. The primary structures to be built are
building foundations, roadways and onsite wastewater systems (OWS). The upper silt and clay and
underlying siltstone exhibit low swell potentials which will affect design and construction of
buildings and roadways. Site-specific geotechnical investigations are recommended for each
structure to determine soil strengths, swell potentials and groundwater levels and to provide
recommendations for structural design. In the event that the roadway is to be paved, a geotechnical
investigation is recommended so that the pavement structure can be designed for the appropriate soil
and traffic conditions. Excavations for foundations, utilities and other structures may need to be
protected from caving. Refer to OSHA standards for the appropriate protection methods.
Our percolation tests indicate slow percolation rates in the soil, which will affect construction
of onsite wastewater systems (OWS). Site-specific percolation investigations for OWS are required
by the County Health Department prior to issuance of a building permit. Engineered OWS are
anticipated for all of the lots. A low-pressure drip irrigation system is a cost effective OWS for slow
percolating soil conditions.
The site observations did not indicate signs of geologic hazards caused by gravity, such as
landslides, debris flows, rock fall, or unstable or potentially unstable slopes. Man-made activities
could produce conditions, which may result in hazardous conditions, if not carefully planned. No
geologic hazard mitigation is anticipated for this site.
LIMITATIONS
This study was preliminary in nature and does not include an evaluation for the extraction of
fossil fuels, uranium or mineral resources other than sand, gravel or quarry aggregate resources. Based on
existing maps, literature and field data potential sand, gravel and quarry aggregate resources are not
believed to exist. Although no geologic or soil hazards appear to exist in the present condition, site-
r—
Engineering Geology Report
Job No. 13896-L
Page 5
specific geotechnical and onsite wastewater investigations should be conducted for each lot.
If we can be of further service in discussing the contents of this report, or to conduct site-specific
investigations, please call.
CHHUURR/CH/&Associates,Inc. �%%%PeoPE%%%%%%ssina. �
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Thomas W. Fink , C.P.G. MPG •• w
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copies sent
Cc: Todd Hodges, 2412 Denby Ct.,Fort Collins, CO 80526
Engineering Geology Report
Job No. 13896-L
Page 6
LIST OF REFERENCES
Tweto, Ogden, 1979, Geologic Map of Colorado: U.S. Geological Survey
Johnson, Erin J., and Himmelreich, John W. Jr., 1998, Geologic Hazards Avoidance or Mitigation:
Colorado Geological Survey Information Series 47
Shelton, David C., Rogers, William P., 1987, Environmental and Engineering Geology of the
Windsor Study Area, Larimer and Weld Counties, Colorado: Colorado Geological
Survey Environmental Geology 6
Colton, Roger B., 1978, Geologic Map of the Boulder-Fort Collins-Greeley Area, Colorado: U.S.
Geological Survey Map I-855-G
Schowchow, S.D, Shroba, R.R., and Wicklein, P.C., 1974, Atlas of Sand, Gravel, and
Quarry Aggregate Resources Colorado Front Range Counties: Colorado Geological
Survey Special Publication 5-B
Rogers, W.P., Ladwig, L.R., Hombaker, A.L., Schowchow, S.D., Hart, S.S., Shelton, D.C., Scroggs,
D.L., and Soule, J.M., 1979, Guidelines and Criteria for Identification of Land-Use Controls
of Geologic Hazard and Mineral Resource Areas, Colorado Geological Survey Special
Publication 6
, 1980, Soil Survey of Weld County, Colorado— Southern Part: U.S. Department of
Agriculture Soil Conservation Service
PROPOSED STAMP MINOR SUBDIVISION SCALE
PART OF THE SW 1/4 SECTION 36, 1 : 50,000
T. 4 N., R. 68 W. OF THE 6TH P.M.
WELD COUNTY, COLORADO N
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R. 68 W. R. 67 W.
VICINITY MAP
JOB NO. 13896-L FIGURE 1
PROPOSED STAMP MINOR SUBDIVISION SCALE
PART OF THE SW 1/4 SECTION 36, 1" = 400'
T. 4 N., R. 68 W. OF THE 6TH P.M.
WELD COUNTY, COLORADO
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TWO PERCOLATION HOLES LOCATED
---- NEAR EACH OF TH-I, TH-3 AND TH-4
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wmato•1aw 321.01•WELD COUNTY ROAD 38
DRAWING BASED ON PRELIMINARY PLAT PROVIDED BY INTERMILL LAND SURVEYING -
PROJECT NO. P-02-5137
SITE PLAN AND LOCATION OF
JOB NO. 13896-L EXPLORATORY BORINGS FIGURE 2
PROPOSED STAMP MINOR SUBDIVISION SCALE
PART OF THE SW 1/4 SECTION 36, 1 : 100,000
T. 4 N., R. 68 W. OF THE 6TH P.M.
WELD COUNTY, COLORADO
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Kptz s
QE - QUATERNARY EOLIUM, WIND-BLOWN CLAY, SILT, SAND AND GRANULES
KFH - CREATACEOUS FOX HILLS SANDSTONE, CROSSBEDDED SANDSTONE, SILTY SANDSTONE AND FISSILE SHALE
KPTZ - CREATACEOUS UPPER TRANSITION MEMBER OF THE PIERRE SHALE, FRIABLE SANDSTONE, SHALT
SANDSTONE
BASED ON USGS MAP I-855-G
AREA GEOLOGY
JOB NO. 13896-L FIGURE 3
PROPOSED STAMP MINOR SUBDIVISION SCALE
PART OF THE SW 1/4 SECTION 36, 1 :75,000
T. 4 N., R. 68 W. OF THE 6TH P.M. k
WELD COUNTY, COLORADO
N
I
_ � / �� / cif 2 - , r , .:,
,O,i r S, ( 3 �•i 2 - y1. Aj )�' I- , v
�Fl 1 i / fr ,ii.
t \ $ t<
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e i h. Ali �� �' �'�` i ,S
-
:U 'SITE r Jim r ;;: \,� ,I 3,
P1�T'�- Jil .-.=l\'; ' I)( ) P 111\l/�i,. 1 �t ',/ ��.�s '-)-s:
x'11,V A i �jea hQ 1 \ r. lYv ;)Vvl` i y ,''
.r „aS ; \ I �� \\‘'‘,N,•A C I t ) e Q / t x: •61,:qd � I )
, I --1-/S `I i J X'J*N !1L.. -/ 7 /11) 'L , \ "I; /
F - FLOODPLAIN DEPOSITS
4-PROBABLE AGGREGATE RESOURCE
SUBJECT SITE LOCATED IN NON-RESOURCE AREA
BASED ON: ATLAS OF SAND, GRAVEL & QUARRY RESOURCES - COLORADO FRONT RANGE COUNTIES
COLORADO GEOLOGICAL SURVEY SPECIAL PUBLICATION 5-8 (1974)
MAP OF SAND, GRAVEL & QUARRY AGGREGEATE RESOURCES
JOB NO. 13896-L FIGURE 4
PROPOSED STAMP MINOR SUBDIVISION SCALE
PART OF THE SW 1/4 SECTION 36, 1° = 2000'
T. 4 N., R. 68 W. OF THE 6TH P.M. k
WELD COUNTY, COLORADO N
WWII tYv z�m±w�ewsw, •
1
7y"9n5?,' rN Y Y 4 `(, �w vtl 2y+ " sommasa
i M1L� hr v,3 1� $ F51y1� t' +3a y� r? f +si � iFii
r1 'P
" +n . n 5 x5M t }, v 4 ai 11' vq�.,i /,�, ' }y��
4 .F''ci Mn , r y V, `(,� e,St f �Tfcf 5� .r H/ '+• �I
t dt-I• ,5-1'h 'PA' AI,Ig r k i 1 1�� S (V { t l t4,I t •lyq l . t
r, i:r �?D"xi.d n..l "Iv +rh `�yl1 11"+'46 7sr. S u"�135/ r?�.AKE
\' k. 5.I` ` i.11 9'{51YI •/ -'#rll ,k,"''',446•4'
rr,4l 1'. 4
.:4 42 t Mil % V r / 5fy�5
-,,,,,.1%.,; b f4 ♦ {(' ..
1"F'1, r tt:', t ItY;^ i ;{ .t.. �4t n'Y t t
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Ar s 7. I;.Tt�83 Tj74 -. YY-t'o-sl.r n T4ra, 4 i Y 'f N '' 1' o-
35 Y
t�:"t` 1 JJJ
I � :;•;441. l tti
xt{ 'y"r≤Mv♦� .,' 1 s 1 '♦ I „k ct {'><'�j 'P,,g
42 `
fc
x �y t• I i.: " 111 '' . v,a �..-' i 1 �'iv'H �'SITE t 1 4..i 5 B2 1
'
5 m r . I
°"
5 5
k 1
'A" lk ,yW \�{`
�,.
vtpr 53 32 ,{,+�yr 4
2 ;may ,''' `[! i i
k v
4 ,x�`'H t �r r� �li •pY� .�,. f yp^aft �-� �v ' t �r '
.(
4 ` t't 2 S t.>kt..5 water
`,fq }'
�� }, ' X79 i\
KEY
42 - NUNN CLAY LOAM - I% To 3% SLOPES
82 -WILEY-COLBY COMPLEX - I% TO 3% SLOPES
83 -WILEY-COLBY COMPLEX -3% To 5% SLOPES
SOIL SURVEY IS BASED ON USDA SOIL SURVEY OF WELD COUNTY. COLORADO
SOIL SURVEY MAP
JOB NO. 13896-L FIGURE 5
I TH-1 TH-2
° 0
-
f7/12 /- 10/12 -
5 •.7- WC = 15.6 5
--
7 DD = 113 ;Fr -
-
10 / WC = 18.8 /'. We ? 11 .7 10
DD = 103 DD = 114
LL- ' ' 50/6 �- 32/12 u.W
15 15 =
a
w w
EXPLANATIONS:
WEATHERED SILTSTONE,SANDY, MOIST,
ti TOPSOIL y FIRM TO MEDIUM HARD, POORLY
ti ; CEMENTED, UGHT BROWN 7 SILT, SANDY, CLAYEY, SUGHTLY MOIST SILTSTONE, SANDY, MOIST, MEDIUM TO
./ TO MOIST, MEDIUM STIFF TO STIFF, ® VERY HARD, UGHT BROWN
/ UGHT BROWN TO RED-BROWN
hi6/12 INDICATES THAT 6 BLOWS OF A 140 POUND HAMMER FALUNG 30 INCHES WERE
REQUIRED TO DRIVE A 2.5 INCH O.D. SAMPLER 12 INCHES
NOTES: 1. THE EXPLORATORY BORINGS WERE DRILLED ON 6-20-2002 USING A 4-INCH
DIAMETER CONTINUOUS FUGI ITAUGER POWERED BY DIETRICH D-50 DRIWNG RIG.
2. NO FREE WATER WAS ENCOUNTERED AT THE TIME OF DRILLING.
3. WC = WATER CONTENT(%) DD = DRY DENSITY(PCF)
-200 = PERCENT OF FINES PASSING THE NUMBER 200 SIEVE.
LOGS OF EXPLORATORY BORINGS
JOB NO. 13896-L FIGURE 6
TH-3 TH-4
0 ti 0
- 9/12 9/12 -
5 • WC = 16.8- ..r WC = 19.0 5
- 2 /• DD = 106 -
4
9/12 -
10 r 3.0 10
-
C 1
PI = 10 " _
�- r -Y
u_- 40/12 50/8 -LL
15 WC = 19.8 15 =
a DD = 108
w
❑ w
0
EXPLANATIONS:
1 f WEATHERED SILTSTONE,SANDY, MOIST,
AZ: TOPSOIL i FIRM TO MEDIUM HARD, POORLY
ti / CEMENTED, UGHfBROWN
SILT,SANDY, CLAYEY, SUGHTLY MOIST ® SILTSTONE, SANDY, MOIST, MEDIUM TO
TO MOIST, MEDIUM STIFF TO STIFF, VERY HARD, LIGHT BROWN
LIGHT BROWN TO RED-BROWN
- W12 INDICATES THAT 6 BLOWS OF A 140 POUND HAMMER FALUNG 30 INCHES WERE
- REQUIRED TO DRIVE A 2.5 INCH O.D. SAMPLER 12 INCHES
NOTES: 1. THE EXPLORATORY BORINGS WERE DRILLED ON 6-20-2002 USING A 4-INCH
DIAMETER CONTINUOUS FLIGHT AUGER POWERED BY DIETRICH D-50 DRIWNG RIG.
2. NO FREE WATER WAS ENCOUNTERED AT THE TIME OF DRIWNG.
3. WC = WATER CONTENT(%) DD = DRY DENSITY(PCF)
-200 = PERCENT OF FINES PASSING THE NUMBER 200 SIEVE.
LOGS OF EXPLORATORY BORINGS
JOB NO. 13896-L FIGURE 7
8
7
6 -
5
0
4
ci
C
0. 3 ..
•
2 EXPANSION UNDER CONSTANT
PRESSURE DUE TO WETTING
1
-2
•C -3
V
E -4
0
U
-5 - -
-6
-7
-8
0.1 1 10 100
APPLIED PRESSURE- ksf
Sample of Clayey Silt from TH-1 @ 4'
Natural Dry Unit Weight = 113 PCF
Natural Moisture Content= 15.6 %
JOB NO. 13896-L SWELL- CONSOLIDATION TEST RESULTS FIGURE 8
8
7
6
5 - . , _
Co 4 _
I
Cc. 3
X
2 -
EXPANSION UNDER CONSTANT
1 PRESSURE DUE TO WETTING
0
1
i
-2
cA
-3
CL)
E -4
O
-5 _ .
-6 .
-7
-8
0.1 1 10 100
APPLIED PRESSURE - ksf
Sample of Clayey Silt from TH-2 @ 9'
Natural Dry Unit Weight = 114 PCF
Natural Moisture Content = 11.7 %
JOB NO. 13896-L SWELL-CONSOLIDATION TEST RESULTS FIGURE 9
I
r. 8
7 _ .
6 - - - -
5
0 4 _ _
3 - _ _ _ ._ _
X
W
2
EXPANSION UNDER CONSTANT
PRESSURE DUE TO WETTING
-1 -
-2 - _ .
0 -3
rn
cu
E -4 -
0
U
_5 - _ .
-6
-7 ,
-8 -
0.1 1 10 100
APPLIED PRESSURE- ksf
Sample of Siltstone from TH-4 @ 14'
Natural Dry Unit Weight = 108 PCF
Natural Moisture Content = 19.8 %
JOB NO. 13896-L SWELL-CONSOLIDATION TEST RESULTS FIGURE 10
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