HomeMy WebLinkAbout20042516.tiff RECEIVED
PRELIMINARY GEOTECHNICAL ENGINEERING REPORT
PROPOSED SCHNEIDER MINOR SUBDIVISION
WELD COUNTY ROAD 16'/s
WELD COUNTY, COLORADO
NORTHERN COLORADO GEOTECH
PROJECT NO. 106-01
November 25, 2001
Prepared for:
Pickett Engineering
808 8th Street
Greeley, Colorado 80631
Attn: Mr. Clayton Harrison
'sib,
Northern
Colorado
Geotech
2956 29th Street, Unit 21
Greeley, Colorado 80631
Phone: (970)506-9244
Fax: (970)506-9242
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2004-2516
Northern
Colorado
Geotech
November 25, 2001 2956 29th Street, unit 21
Greeley, Colorado 80631
Phone: (970)506-9244
Fax: (970)5069242
Pickett Engineering
808 8th Street
Greeley, Colorado 80631
Attn: Mr. Clayton Harrison
Re: Preliminary Geotechnical Engineering Report
Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
Northern Colorado Geotech has completed a preliminary geotechnical engineering exploration for
the proposed residential subdivision to be located along Weld County Road 16'/: approximately '/:-
mile east of County Line Road east of Longmont, Colorado. This study was performed in general
accordance with our proposal number P01028g dated October 8, 2001.
The subsurface soils at the site consisted of sandy lean clay and silty clayey sand that extends to
depths of 15 feet. The results of our field exploration and laboratory testing indicate that the soils
have low expansive potential and have low to moderate load bearing capabilities. Groundwater was
only encountered in Test Boring 8 at the southern end of the property at a depth of 3'/:feet.
Based on the anticipated construction and the results of our engineering exploration, it is our opinion
that proposed structures may be supported by spread footing foundations. The recommendations
contained in this report are preliminary in nature. Additional geotechnical exploration should be
performed prior to the start of construction at the site.
If you have any questions concerning this report or any of our consulting services, please do not
hesitate to contact us at (970) 506-9244.
-
Sincerely,
NORTHERN COLORADO GEOTECH.f..:•Doug Leafgren, P.G. ••:: '
Presi• nt
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G G. eeks, P. . 23012
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TABLE OF CONTENTS
Page No.
Letter of Transmittal ii
SCOPE 1
SITE CONDITIONS 1
PROPOSED CONSTRUCTION 2
SITE EXPLORATION 2
Laboratory Testing 2
SUBSURFACE CONDITIONS 3
Geology 3
Soil Conditions 4
Groundwater Conditions 4
Field Test Results - 4
Laboratory Test Results 4
PRELIMINARY DESIGN RECOMMENDATIONS 5
Foundation Design 5
Footing Foundations 5
Below Grade Construction 5
Roadway Design and Construction 6
Septic System Construction 6
General Earthwork 6
Site Preparation 7
Fill Materials and Placement 7
GENERAL COMMENTS - 8
ATTACHMENTS
Boring Location Plan
Logs of Borings
Laboratory Test Results
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PRELIMINARY GEOTECHNICAL ENGINEERING REPORT
PROPOSED SCHNEIDER MINOR SUBDIVISION
WELD COUNTY ROAD 16%
WELD COUNTY, COLORADO
NORTHERN COLORADO GEOTECH
PROJECT NO. 106-01
NOVEMBER 25, 2001
SCOPE
This report contains the results of our preliminary geotechnical engineering exploration for the
proposed Schneider minor subdivision to be located along Weld County Road 16% approximately
%-mile east of County Line Road near Longmont, Colorado. The site is located in the northwest
quarter of Section 30, Township 2 North, Range 68 West of the 6th Principal Meridian.
This report includes descriptions of, and preliminary geotechnical engineering recommendations
relative to: -
• subsurface soil conditions
• groundwater conditions
• foundation design
• basement construction
• drainage
• septic systems
• earthwork
The recommendations contained in this report are preliminary in nature and based upon the results
of field and laboratory testing, engineering analyses, and experience with similar soil conditions,
structures and our understanding of the proposed project.
SITE CONDITIONS
The site is currently vegetated with weeds and minor grasses in the southern portion of the site.
Surface drainage is good to the southeast. The Gooding, Daily and Plumb Ditch runs through the
southeastem portion of the site. The property is bordered to the north and west by existing
residential structures that are located on small acreages. A large gravel mining operation is located
east of the site. Weld County Road 16% borders the site to the south. Several oil/gas wells and
pipelines were observed on the property. One oil tank battery and an animal loafing shed were
Preliminary Geotechnical Engineering Report
Proposed Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
observed near the center of the site. The lower, southern end of the site is a marshy area
vegetated with numerous cattails.
PROPOSED CONSTRUCTION
As we understand it, the site will be developed for approximately 9 residential estate style lots. The
lots will be serviced on on-site sewage disposal systems. We assume that minimal site grading will
be performed during the development of the site.
SITE EXPLORATION
A total of eight test borings were drilled on October 26, 2001. The borings were drilled to
approximate depths of 5 to 15 feet at the locations shown on the Site Plan, Figure 1. Four of the
test borings were drilled in the area of proposed roadways to depths of 5 feet. The other four
borings were drilled in the areas of proposed lots to depths of 15 feet. Additionally, one preliminary
percolation test boring was drilled adjacent to each 15 foot soil test boring. All borings were
advanced with a truck-mounted drilling rig, utilizing 4- and 6-inch:diameter solid stem augers.
The borings were located in the field by pacing from property lines and/or existing site features.
The accuracy of boring locations should only be assumed to the level implied by the methods used.
Lithologic logs of each boring were recorded by an engineering geologist during the drilling
operations. At selected intervals, samples of the subsurface materials were taken by driving split-
spoon and/or ring samplers. Standard penetration measurements were recorded while driving a
split-spoon and/or ring sampler into the subsurface materials. The standard penetration test is a
useful index in estimating the density of the materials encountered.
Groundwater conditions were evaluated in each boring at the time of subsurface exploration, and
11 days after the drilling.
Laboratory Testing
The samples retrieved during the subsurface exploration were returned to our laboratory for
observation by the project manager. The soils were classified in general accordance with the
Unified Soil Classification System. At that time, the field descriptions were confirmed or modified
and an applicable laboratory testing program was formulated. Boring logs were prepared and are
attached with this report.
2
Preliminary Geotechnical Engineering Report
Proposed Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
Laboratory tests were conducted on selected samples and are presented on the boring logs and
attached laboratory test sheets. The test results were used for the geotechnical engineering
analyses, and the development of foundation and earthwork recommendations.
Selected samples were tested for the following engineering properties:
• Water Content • Consolidation
• Dry Density • Expansion
• Atterberg Limits • Percent Fines
SUBSURFACE CONDITIONS
Geology
The proposed area is located within the Great Plains physiographic province. The Colorado
Piedmont is located near the western border of the Great Plains province and was formed during
Late Tertiary and Early Quatemary time (approximately 2,000,000 years ago). The Colorado
Piedmont is a broad, erosional trench which separates the Southern Rocky Mountains from the
High Plains. Structurally, the site lies along the western flank of the Denver Basin. During the
mountain building of the Laramide Orogeny (approximately 70,000,000 years ago), intense tectonic
activity occurred, causing the uplifting of the Front Range and associated downwarping of the
Denver Basin to the east. Due to the erosional action of wind and streams, relatively flat uplands
and broad valleys characterize the present-day topography of the Colorado Piedmont in this
region.
The site is underlain by the Cretaceous Laramie Formation. The Laramie consists of interbedded
layers of sandstone, siltstone and claystone. Numerous coal beds are also located within the
Laramie Formation in Southernn-Weld County and Boulder County. During our site reconnaissance,
we did not observe any mine shafts or tailings piles located on the site. Based on maps of past coal
mining and conversations with Ms. Celia Greenman of the Colorado Geological Survey, it is our
opinion that the site has a low subsidence potential due to previous coal mining operations.
Due to the relatively flat nature of the site, geologic hazards at the site are anticipated to be low.
Seismic activity in the area is anticipated to be low; and from a structural geology standpoint, the
property should be relatively stable. With proper site grading around proposed structures,
erosional problems at the site should be minimal.
3
Preliminary Geotechnical Engineering Report
Proposed Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
Soil Conditions
Soils at the site generally consist of silty clayey sand and/or sandy lean day that extends to depths
of 15 feet. Summary boring logs are attached with this report.
Groundwater Conditions
Groundwater was only encountered in Test Boring 8 at the southern end of the site at an
approximate depth of 3'34 feet when it was checked 11 days after the drilling. These observations
represent groundwater conditions at the time of the field exploration, and may not be indicative of
other times, or at other locations. Groundwater levels can be expected to fluctuate with varying
seasonal and weather conditions.
Field Test Results
Field test results indicate that the day soils vary from soft to very stiff in consistency. The sand
soils vary from loose to medium dense in relative density. Preliminary percolation testing is
summarized as follows:
Preliminary Percolation Test Results
Test Hole Depth Soil Percolation Rate
(inches) Classification (minutes/inch)
1 36 SC-SM 5
2 36 CL 13
3 36 SC-SM 7
4 36 CL 12
The soils in the area of proposed leach fields have good percolation rates.
Laboratory Test Results _
Laboratory test results indicate that the soils have low expansive potential and low to moderate
load bearing capabilities.
4
^ Preliminary Geotechnical Engineering Report
Proposed Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
PRELIMINARY DESIGN RECOMMENDATIONS
Foundation Design
Based on the results of our preliminary subsurface exploration and laboratory testing, it is our
opinion that spread footing foundations may be used for support of proposed structures at the site.
The footings should be placed on undisturbed soils and/or engineered fill material.
Footing Foundations
Footings founded on the on-site soil may be preliminarily designed for maximum bearing pressures
of 1,500 to 2,500 psf. Additionally, various locations may require a minimum dead load of up to
500 psf.
Exterior footings should be placed a minimum of 30 inches below finished grade for frost protection
and to provide confinement for the bearing soils. Finished grade is the lowest adjacent grade for
perimeter footings.
,o., Below Grade Construction
Groundwater was not encountered in the area of proposed residences to a depth of 15 feet.
Therefore, full-depth basement construction is considered acceptable on the site.
Completion of site development, including installation of landscaping and irrigation systems, may
lead to groundwater development.
To reduce the potential for groundwater to impact foundation bearing soils and enter the basement
of the structure, installation of a perimeter drainage system is recommended. The drainage system
should be constructed around the exterior perimeter of the basement foundation, and sloped at a
minimum 1/8 inch per foot to a suitable outlet, such as a sump and pump system.
Surface Drainage
Positive drainage should be provided during construction and maintained throughout the life of the
proposed project. Infiltration of water into utility or foundation excavations must be prevented
during construction. Planters and other surface features which could retain water in areas adjacent
to the building or pavements should be sealed or eliminated. In areas where sidewalks or paving
do not immediately adjoin the structure, we recommend that protective slopes be provided with a
minimum grade of approximately 10 percent for at least 10 feet from perimeter walls. Backfill
es-
'." Preliminary Geotechnical Engineering Report
Proposed Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
against footings, exterior walls, and in utility and sprinkler line trenches should be well compacted
and free of all construction debris to reduce the possibility of moisture infiltration.
Downspouts, roof drains or scuppers should discharge into splash blocks or extensions when the
ground surface beneath such features is not protected by exterior slabs or paving. Sprinkler
systems should not be installed within 5 feet of foundation walls. Landscaped irrigation adjacent to
the foundation system should be minimized or eliminated.
Roadway Design and Construction
It is our understanding that the owner of the property would like to have only gravel roads within the
development. Based upon the soil conditions encountered at the site and the anticipated traffic
generated by the proposed development, it is our opinion that 6-inches of class 5 or 6 road base
will be sufficient for use at the site.
Based upon the subsurface conditions determined from the geotechnical exploration, subgrade
soils exposed during construction are anticipated to be relatively:stable throughout most of the site.
However, the high groundwater and moisture contents encountered on the southern end of the
property will like result in unstable subgrade conditions in this part of the site. The stability of the
subgrade will be affected by precipitation, repetitive construction traffic or other factors. When
unstable conditions develop, workability may be improved by scarifying and drying although it is
likely that this area will either need to be built up to get above the groundwater or some of the on-
site soils may need to be removed and replaced with granular materials. Lightweight excavation
equipment may be required to reduce subgrade pumping.
Septic System Construction
Field test results indicate that standard septic systems are feasible for construction in the area of
proposed residential construction. Complete percolation tests should be performed when proposed
residences and absorption beds have been sited. The systems should be designed in accordance
with applicable state and county requirements and should be located at the minimum distances
from all pertinent ground features described in Weld County regulations.
General Earthwork
All earthwork on the project should be observed and evaluated by Northern Colorado
Geotech. The evaluation of earthwork should include observation and testing of
6
Preliminary Geotechnical Engineering Report
Proposed Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
engineered fill, subgrade preparation, foundation bearing soils, and other geotechnical
conditions exposed during the construction of the project.
Site Preparation
Strip and remove existing vegetation, debris, and other deleterious materials from proposed
building and pavement areas. All exposed surfaces should be free of mounds and
depressions which could prevent uniform compaction.
Stripped materials consisting of vegetation and organic materials should be wasted from the
site, or used to revegetate landscaped areas or exposed slopes after completion of grading
operations.
If unexpected fills or underground facilities are encountered, such features should be
removed and the excavation thoroughly cleaned prior to backfill placement and/or
construction.
Depending upon depth of excavation and seasonal -conditions, groundwater may be
encountered in excavations on the site. Pumping from sumps may be utilized to control
water within excavations. Well points may be required for significant groundwater flow, or
where excavations penetrate groundwater to a significant depth.
The individual contractor(s) is responsible for designing and constructing stable, temporary
excavations as required to maintain stability of both the excavation sides and bottom. All
excavations should be sloped or shored in the interest of safety following local, and federal
regulations, including current OSHA excavation and trench safety standards.
Fill Materials and Placement
All exposed areas which will receive fill should be scarified to a minimum depth of eight
inches, conditioned to near optimum moisture content, and compacted.
The placement of soils on the site should be observed by Northern Colorado Geotech. The
fill should be assessed for suitability of use in the proposed fill and tested for placement
including compaction percentage and moisture content.
Engineered fill should be placed and compacted in horizontal lifts, using equipment and
procedures that will produce recommended moisture contents and densities throughout the
lift. Recommended compaction criteria for engineered fill materials are as follows:
7
Preliminary Geotechnical Engineering Report
Proposed Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
Clean on-site soils or approved imported materials may be used as fill material.
Imported soils (if required) should conform to the following:
Percent fines by weight
Gradation (ASTM C1361
6" 100
3" 70-100
No. 4 Sieve 50-100
No. 200 Sieve 60 (max)
• Liquid Limit 30 (max)
• Plasticity Index 15 (max)
Minimum Percent
Material fASTM D6981
Scarified subgrade soils 95
On-site and imported fill soils:
Beneath foundations 95
Beneath slabs 95
On-site clay soils should be compacted within a moisture content range of 2 percent below,
to 2 percent above optimum. Granular soils should be compacted within a moisture range
of 3 percent below to 3 percent above optimum unless modified by the project geotechnical
engineer.
GENERAL COMMENTS
The analysis and recommendations presented in this report are based upon data obtained from
borings performed to obtain representative subsurface conditions at the site. Variations in the soil
between borings will occur. Northern Colorado Geotech should be present during construction to
observe the excavation and construction procedures and confirm or modify our recommendations.
The scope of services for this project does not include either specifically or by implication any
environmental assessment of the site.
8
i^ Preliminary Geotechnical Engineering Report
Proposed Schneider Minor Subdivision
Northern Colorado Geotech Project No. 106-01
This report has been prepared in accordance with generally accepted geotechnical engineering
practices in this area at this time. No warranties, either express or implied, are intended or made.
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Weld County, Colorado Proposed Schneider Minor Subdivision
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SITE Weld County Road 16 1/2 PROJECT
Weld County, Colorado Proposed Schneider Minor Subdivision
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SITE Weld County Road 16 1/2 PROJECT
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SITE Weld County Road 16 1/2 PROJECT
Weld County, Colorado Proposed Schneider Minor Subdivision
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SITE Weld County Road 16 1/2 PROJECT
Weld County, Colorado Proposed Schneider Minor Subdivision
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Weld County, Colorado Proposed Schneider Minor Subdivision
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SITE Weld County Road 16 1/2 PROJECT
Weld County, Colorado Proposed Schneider Minor Subdivision
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Specimen Identification Classification Yd MC%
• 1 8.0 Silty Clayey Sand I 99 6
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Northern
2956 29th Street, unit 21 Client: Pickett Engineering
Colorado Greeley,Colorado 80631 4/S\ Phone: 970-506-9244 Project: Proposed Schneider Minor Subdivision
u Geotech Fax: 970-506-9242
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4 Number: 106-01
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