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Feb -24 -00 031.44P town #of #debebeque 970+283+5205 P.02
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moisture requirements; irrigated grass should not be located within 6
feet of the foundation. Sprinklers should not discharge within 6 feet
of the foundation and should be directed away from the building.
Irrigation should be limited to the minimum amount sufficient to
maintain vegetation; the application of additional water will increase
the likelihood of slab and foundation movements.
6. Impervious plastic membranes should not be used to cover the ground
surface immediately surrounding the residence. These membranes
tend to trap moisture and prevent normal evaporation from occurring.
Geotextlle fabrics can be used to control weed growth and allow some
evaporation to occur.
PERCOLATION TESTING
We excavated three percolation pits (P -1 through P4) and one profile pit
(Profile) in the area of the planned percolation field in the approximate locations
shown on Figure 1. Graphic logs of the subsoils exposed in the pits are shown on
Figure 2. Percolation tests were performed in excavations made into the bottom of
the test pits. Results of our percolation tests are shown on Figures 4 through 6.
Percolation test results Indicate that a design percolation rate will be out 20
minutes per inch. We recommend the percolation field be designed by an engineer
qualified in septic field design such as Church and Associates, (3113) 463 317
LIMITATIONS
Our exploratory pits were spaced to obtain a reasonably accurate picture of
Subsurface conditions. Variations in the subsurface conditions not Indicated by our
pits will occur. We should observe the completed foundation excavation to confirm
the soils are as anticipated from our exploratory pits and suitable for support of the
designed footings.
Our report was based on conditions disclosed by our exploratory pits,
engineering analysis and our experience. Criteria presented reflect our
understanding of the proposed construction. We should be advised if the final
OAKWOOD HOMES
LOT 16, KLOCK 6, ELK CREEK 6VSOIWSION
OM OS-1894 8
F_ -24 -00 03!44P town#of#debeboque 9704-2834-5205 P.03
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TABLE OF CONTENTS
SCOPE 1
SUMMARY OF CONCLUSIONS 1
SITE CONDITIONS 2
PROPOSED CONSTRUCTION 2
SUBSURFACE CONDITIONS 2
SITE EXCAVATION AND GRADING 3
FOUNDATION 4
SLAB -ON -GRADE CONSTRUCTION 6
BELOW -GRADE CONSTRUCTION 6
SURFACE DRAINAGE 7
PERCOLATION TESTING 8
LIMITATIONS 8
FIGURE 1 - APPROXIMATE LOCATIONS OF EXPLORATORY PITS
FIGURE 2 - SUMMARY LOGS OF EXPLORATORY PITS
FIGURE 3 - EXTERIOR FOUNDATION WALL DRAIN
FIGURES 4 THROUGH 6 - PERCOLATION TEST RESULTS
TABLE I - SUMMARY OF LABORATORY TEST RESULTS
OAKWOOD HOMES
LOT 16, BLOCK 5, ELK CREEK SUBDIVISION
CTL/T GS -2894
SCOPE
This report presents the results of our soils and foundation investigation for
the proposed residence on Lot 16, Block 5, Elk Creek Subdivision in New Castle,
Colorado. We conducted the investigation to evaluate the subsurface conditions at
the site and provide foundation recommendations for the proposed single family
residence. Our report was prepared from data developed during our field
exploration, laboratory testing, engineering analysis and our experience with similar
conditions. This report includes a description of the subsurface conditions found
in our exploratory pits, our opinions and recommendations for design criteria for
recommended foundation and floor systems, and geotechnical and construction
criteria for details influenced by the subsoils. The recommendations contained in
the report were developed based on our understanding of the planned construction.
Revisions to the anticipated construction could affect our recommendations. A
summary of our conclusions is presented below.
SUMMARY OF CONCLUSIONS
1. Subsurface conditions found in our exploratory pits consisted of 4
inches of silty clay "topsoil" and 2 feet of silty clay underlain by
weathered to comparatively unweathered claystone bedrock to the
total explored depth of 9 feet below existing ground surface. Free
ground water was not found in our exploratory pits during excavation
operations.
2. We recommend constructing the residence on footing foundations.
Design and construction criteria for footings are presented in the
report.
3. The proposed residence will be modular building with a structural floor
system. Slab -on -grade construction will be limited to exterior flatwork
at this site. We judge potential differential movement of slabs -on-
grade supported by the subsoils at this site will be low.
4. Surface drainage should be designed to provide for rapid removal of
surface water away from the proposed residence.
OAKWOOD HOMES
LOT 16, BLOCK 5, ELK CREEK SUBDIVISION
CTLJT GS-2894
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construction. Experience indicates over a period of time, moist conditions can
develop in crawl spaces which result in damp, musty smells and standing water. To
reduce the risk of accumulation of water in crawl spaces, we recommend provision
of a foundation drain. The drain should consist of a 4 -inch diameter, open joint or
slotted pipe encased in free draining gravel. The drain should lead to a positive
gravity outlet, or to a sump pit where water can be removed by pumping. Gravity
outlets should not be susceptible to clogging or freezing. A typical foundation drain
detail is presented on Figure 3. The crawl space should be well ventilated.
SURFACE DRAINAGE
Surface drainage is critical to the performance of foundations and concrete
flatwork. We recommend the following precautions be observed during construction
and maintained at all times after the residence is completed:
1. Wetting or drying of the open foundation excavation should be
avoided.
2. The ground surface surrounding the exterior of the residence should
be sloped to drain away from the residence in all directions. We
recommend providing a slope of at least 12 inches in the first 10 feet
around the residence, where possible. In no case should the slope be
less than 6 inches in the first 5 feet. We recommend incorporating a
drainage swale above the residence to direct surface water around the
residence.
3. Backfill around the exterior of foundation walls should be moistened
and compacted to at least 95 percent of maximum standard Proctor
(ASTM D 698) dry density.
4. Roof downspouts and drains should discharge well beyond the limits
of all backfill. Splash blocks and downspout extensions should be
provided at all discharge points. We specifically recommend against
burying downspout discharge pipes because it increases the potential
for subsurface wetting near the foundation. Snow should not be
allowed to accumulate adjacent to the residence.
5. Landscaping should be carefully designed to minimize irrigation.
Plants used near foundation walls should be limited to those with low
OAKWOOD HOMES
LOT 16. BLOCK 5, ELK CREEK SUBDIVISION 7
CTL1T GS.2894
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' SATURATION AND PREPARATION PERCOLATION TEST
DATE: 11/01/99 DATE: 11/024/99
TIME AT START OF SATURATION: 4:43pm WATER IN BORING AFTER 24 HOURS
YES X NO
PERCOLATION TEST RESULTS
DEPTH TO WATER
HOLE DEPTH TIME AT TIME CHANGE PERCOLA-
NUMBER (INCHES) START OF INTERVAL IN WATER TION RATE
INTERVAL (MINUTES) START OF END OF DEPTH (MIN /INCH)
INTERVAL INTERVAL (INCHES)
(INCHES) (INCHES)
P -2 47 1:31 10 0.0 3.0 3.0 3
1:41 10 3.0 4.75 1.75 6
1:51 10 4.75 5.75 1.0 10
2:01 10 5.75 7.0 1.25 8
2:11 10 7.0 8.0 1.0 10
2:21 10 8.0 9.0 1.0 10
2:39' 10 • 0.0 2.5 2.5 4
2:49 10 2.5 3.5 1.0 10
2:59 10 3.5 4.5 1.0 10
3:09 10 4.5 5.5 1.0 10
3:19 10 5.5 6.5 1.0 10
3:29 10 6.5 7.5 1.0 10
3:39 10 7.5 8.0 0.5 20
3:51* 10 0.0 1.5 1.5 7
4:01 10 1.5 3.0 1.5 7
4:11 10 3.0 4.5 1.5 7
4:21 10 4.5 6.0 1.5 7
4:31 10 6.0 7.0 1.0 10
4:41 10 7.0 7.75 0.75 13
Hole refilled with water 1 1 i Q
Job No. GS -2894 Fig. 5