HomeMy WebLinkAboutLANDINGS PUD FOURTH SECOND REPLAT GEO2REPORT
OF A
GEOTECHNICAU INVESTIGATION
FOR
THE JETTY
FORT COLLINS, COLORADO
FAI RFIELD HOMES
LAKEWOOD, COLORADO
PROJECT NO. 8045-89
BY
EMPIRE LABORATORIES, INC.
301 NORTH HOMES STREET
FORT COLLINS, COLORADO 80521
TABLE OF CONTENTS
Table of Contents ..............................................
i
Letter of Transmittal ........ • • .............. ............ ......
1
Report ..........................................................
A-1
Appendix A ..... ..... .....
Test Boring Location Plan ....................................
A-2
A-3
Key to Borings ................................................
A-4
Log of Borings ...............................................
B-1
Appendix B.................................. ..................
B-2
Consolidation Test Data ... • ...
B-3
Hveem Stabilometer Data .....................................
Summary of Test Results ..................... ....... • • • • • • • •
B-4
C-1
Appendix C ........
Empire Laboratories, Inc.
GEOTECHNICAL ENGINEERING 8 MATERIALS TESTING
June 9, 1989
Fairfield Homes
2618 Deframe Circle
Lakewood, Colorado 80228
Attention: Mr. Ken Slyziuk
Gentlemen:
CORPORATE OFFICE
P.O. Box 503 a (303) 464-0359
301 No. Howes • Fort Collins, Colorado 80522
We are pleased to submit our Report of a Geotechnical Investigation pre- pared for the proposed residential development, located at the Northeast
corner of Landings and Boardwalk Drives, Fort Collins, Colorado.
Based upon our findings in the subsurface, it is our opinion the site is
suitable -for the proposed construction, providing the design criteria and
recommendations set forth in this report are met. The accompanying report
presents our findings in the subsurface and our recommendations based upon
these findings.
Very truly yours,
EMPIRE LABORATOR INC.
Alf
Neil R. S lerrod
Senior Engineering Geologist
Reviewed by. -
Chester C. Smith, P.E.
President
t/s
Branch Orykes
C. 9 V,
ERA
1
P.O. Box 16859 P.O. Boa 1135 P.O. Boss 1744
Colorado Springs, CO 80935 Longmont, CO 80502 Greeley, CO 80632
719) 597.2116 (303) 776.3921 (3031 151.0460
Member of Consul)ing Engineers Cow
P.O. Box 5659
Cheyenne. WY 82003
307) 632-9224
REPORT
OF A
GEOTECHNICAL INVESTIGATION
SCOPE
This report presents the results of a geotechnical evaluation
prepared for the proposed residential development located at the
northeast corner of Landings and Boardwalk Drives in south Fort
Collins, Colorado. The investigation included test borings and
laboratory testing of samples obtained from these borings.
The objectives of this study were to (1) evaluate the subsurface
conditions at the site relative to the proposed construction, (2) make
recommendations regarding the design of the substructures, (3)
recommend certain precautions which should be taken because of adverse
soil and/or ground water conditions, and (4) make recommendations
regarding pavement types and thicknesses for the proposed streets to be
constructed at the site.
SITE EXPLORATION
The field exploration, carried out on June 5, 1989, consisted of
drilling, logging, and sampling five (5) test borings. The test borings
were located by Empire Laboratories, Inc. from the existing street
intersections using conventional chaining methods. The locations of the
test borings are shown on the Test Boring Location Plan included in
Appendix A of this report. Boring logs prepared from the field logs are
shown in Appendix A. These logs show soils encountered, location of
sampling, and ground water at the time of the exploration.
The borings were advanced with a four -inch diameter, continuous -
type, power -flight auger drill. During the drilling operations, a
geotechnical engineer from Empire Laboratories, Inc. was present and
made continuous observations of the soils encountered.
SITE LOCATION AND DESCRIPTION
The site is located at the northeast corner of Boardwalk and
Landings Drives in south Fort Collins, Colorado. More particularly, the
site is described as The Jetty, a subdivision situate in the Southwest
1 /4 of Section 36, Township 7 North, Range 69 West of the Sixth P.M.,
City of Fort Collins, Larimer County, Colorado.
The site consists of a vacant tract of land 'vegetated with grass and,
weeds. The property is relatively flat to gently rolling and has positive
drainage to the north-northwest toward the Larimer County Canal, which
forms the north boundary of the site. A narrow ridge, approximately
ten (10) to twenty (20) feet wide and three (3) to five (5) feet high,
parallels Boardwalk and Landings Drives. The canal at the north edge
of the site is approximately ten (10) feet deep.
LABORATORY TESTS AND EVALUATION
Samples obtained from the test borings were subjected to testing in
the laboratory to provide a sound basis for evaluating the physical
properties of the soils encountered. Moisture contents, dry unit
weights, unconfined compressive strengths, water soluble sulfates,
sulfides, pH, resistivity, oxidation-reduction potential, swelling
potentials, and the .Atterberg limits were determined. A summary of the
test results is included in Appendix B. Swell -consolidation and Hveem
stabilometer characteristics were also determined, and curves showing
this data are included in Appendix B.
SOIL AND GROUND WATER CONDITIONS
The soil _ profile at the site consists of strata of materials arranged
in different combinations. In order of increasing depths, they are as
follows:
1) Silty Topsoil: The area tested is overlain by a six (6) inch
layer of silty topsoil. The topsoil has been penetrated by root
a