HomeMy WebLinkAbout972512.tiff DENVER 4/„ La FORT 8 LUPTON
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PO. BOX 392
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FORT LUPTON COLORADO. 80621
JUNE 30 , 1986
• • SUBSURFACE INVESTIGATION
OF
A PART OF THE NORTHEAST ONE-QUARTER,
SECTION 22 , TOWNSHIP 2 NORTH, RANGE 67 WEST,
WELD COUNTY, COLORADO
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TABLE OF CONTENTS
Site Conditions Page 1
Conclusions and Foundation Recommendations Page 1
General Page 1
Field and Laboratory Investigation Page 1
Design and Construction Detail Slab on Grade Construction Page 2
Surface Drainage Page 2
Subsurface Drainage and Basement Construction Page 2
Reinforcing Page 2
Construction Details Page 3
Site Plan Figure 1
Log of Test Holes Figure 2
972 512
SITE CONDITIONS :
At the present time this site is vacant and it is planned
that a single family home be constructed on this site.
CONCLUSIONS AND FOUNDATION RECOMMENDATIONS:
A satisfactory type of foundation system will be continuous
concrete footings bearing on the undisturbed natural soil . These
footings shall be designed for a maximum soil bearing pressure of
600 pounds per square foot, dead load, plus one-half live load,
for all depths of the excavated area. All loose and disturbed
soil shall be removed before placing of the concrete for the
footings . The bottom of the footings shall be a minimum of three
feet ( 3 ' ) below final grade for frost protection. Very little
settlement can be expected with the foundation being based on the
SM soils .
GENERAL:
This report presents the results of data obtained during the
subsoil investigation of a part of the Northeast one-quarter of
Section 22 , Township 2 North, Range 67 West, Weld County, Colorado.
This investigation was made to determine the most suitable type
and depths of the foundation system, allowable soil bearing
pressures , ground water conditions and problems that may be
encountered during and after construction due to the soil and
ground water conditions .
FIELD AND LABORATORY INVESTIGATION:
One ( 1 ) test hole was dug on June 30 , 1986 at the location on
the site as shown in Figure 1 .
At two foot ( 2 ' ) intervals, the drilling tools were removed
from the test holes and soil samples were obtained .
( 1 ) 97251 2
All soil samples were carefully inspected and classified in
the field. The samples were subjected to visual inspection in
order to evaluate the physical and mechanical properties of the
materihls encountered. There should be very little swelling or
consolidation of this soil .
In general , the profile consists of sandy silt (SM) to a
depth of 10 feet. No free water was encountered during the
excavating operation.
DESIGN AND CONSTRUCTION DETAIL SLAB ON GRADE CONSTRUCTION:
• The natural soils are suitable for the support of exterior
concrete slabs , garage slabs, lower level and basement floor
slabs . These SM soils will not be expected to swell or consoli-
date.
SURFACE DRAINAGE:
The backfill around the buildings should slope away from
the buildings 0 . 5 feet in the first 10 feet and 2% to the back
of the curbs .
Roof downspouts and sillcocks should discharge onto concrete
splashblocks or into metal gutter extentions to prevent erosion
in the silty and gravelly soils .
SUBSURFACE DRAINAGE AND BASEMENT CONSTRUCTION:
The water table is well below the foundation. The well
drained SM soils will not require a foundation drain.
REINFORCING:
The concrete foundation walls should be well reinforced at
the top and bottom of the walls . This will give the walls beam
strength to span or bridge over any soft or loose pockets of soil
not found in our exploratory holes or that may develop during
( 2 ) 972t7' 2
construction . This will also help prevent differential movements
of the foundation system.
CONSTRUCTION DETAILS :
In any investigation it is necessary to assume that the
subsurface soil condition do not vary greatly from the conditions
encountered in the field and laboratory testing. Our experience
has been that, at times, soil conditions do change and variations
do occur and may become apparent at the time of excavation for
the foundation system. If soil conditions are encountered which
appear different from the test borings as presented in this report ,
it is recommended that this office or a qualified soils engineer
be called to inspect the open excavation prior to placing the
footings . This inspection is not a part of this report and is
not included as any part thereof .
( 3 ) 972V.7
242.0'
Beginning at the East Quarter Corner (El Cor) of Section
Twenty-two (22), Township Two (2) North, Range Sixty-seven (67)
West of the 6th P.M. , County of Weld, State of Colorado;
thence North along the East line NEI of said section, 242 feet
to the true point of Beginning; thence continuing North along
said East line, 242 feet; thence West 360 feet; thence South
241.86 feet; thence East 360 feet to the True Point of
Beginning
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PROPOSED HOUSE
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242.0'
WELD COUNTY ROAD 21 z
SITE PLAN SCALE I"=40'
FIG.
- 97211.2
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SM
Sandy Silt
10
SOIL PROFILE
Figure 2
9 /21'1.2
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