HomeMy WebLinkAbout4615 DUSTY SAGE DR - SPECIAL INSPECTIONS - 11/11/2005November 11, 2005
Project No: 1090-24-02
Rutt Construct, Inc.
P.M.B. 344
1001 A East Harmony Road
Ft. Collins, Colorado 80525-3354
Re: Lots 94-97, Harmony Ridge P.U.D.; Fort Collins, Colorado
4615 Dusty Sage Drive 74(3
Dear Mr. Rutt,
RR
I.
ENGI EERINGG
CORPORATION
Shear Engineering Corporation conducted foundation excavation observations for the above
referenced address on Thursday, September 8, 2005. The soils noted at the bottom of the
basement excavation consisted primarily of slightly clayey sands and gravels. The soils noted at
the bottom of the walkout excavation also consist primarily of slightly clayey sands and gravels.
The soils noted at the bottom of the upper garage footing excavation consisted primarily of silty
sandy clay. The soils noted in the excavation are generally consistent with the soils profiles
provided by Earth Engineering Consultants, Inc. in the geotechnical investigation report for
Harmony Ridge P.U.D. titled "Subsurface Exploration Report, Harmony Ridge P.U.D., Fort
Collins, Colorado"; EEC project number 1972027; report dated May 5, 1997.
Due to separation requirements from claystone noted in the geotechnical investigation report for
Harmony Ridge P.U.D., a test hole was dug to three feet (T) below the basement excavation.
Claystone bedrock was not noted in the test hole.
Boring Logs B 12 and B 13 were the nearest borings taken to this site. Boring Log B 12 indicated
silty clay with gravel to a depth of two feet (2'), underlain by silty clayey sand to a depth of nine
feet ff ), underlain by sand to a depth of fifteen feet (15'), underlain by highly weathered
claystone to a depth of twenty-one feet (21'), the bottom of the boring. Boring Log B 13 indicated
silty clay with to a depth of two feet (2'), underlain by sandy silt to a depth of five and one half
feet (5.5'), underlain by sand and gravel to a depth often feet (10'), underlain by sandy lean clay
to a depth of fifteen and one half feet (15.5'), underlain by coarse sand and gravel to -a depth of
twenty and one half feet (20.5'), the bottom of the boring.
This lot is suitable for a spread footing foundation system. The foundation plan for the proposed
residence prepared by Shear Engineering Corporation, dated April 2005 (latest revision date:
09/15/2005) was used. Footings were originally designed for a maximum allowable bearing
capacity of 1,500 pounds per square foot (dead load plus full live load) and a minimum dead load
of 500 pounds per square foot according to the recommendations of the geotechnical
investigation report. Those bearing capacities were actually for fill conditions. Due to the actual
undisturbed nature of the footing bearing soils, footings were redesigned for a maximum
allowable bearing capacity of 2,500 pounds per square foot (dead load plus full live load) and a
minimum dead load of 500 pounds per square foot according to the recommendations of the
geotechnical investigation report for undisturbed soils.
4836 S. College, Suite 12 Ft. Collins, CO 80525 (970) 226-5334 Fax (970) 282-0311 WWW.shearengineering.corn
PAGE 2
November 11, 2005
Project No: 1090-24-02
Re: Lots 94-97, Harmony Ridge P.U.D.; Fort Collins, Colorado
46t5 Dusty Sage Drive
Shear Engineering Corporation was present on Friday, September 16, 2005 for footing formwork
and footing reinforcing placement observations. Shear Engineering Corporation was present on
Tuesday, October 18, 2005 and Wednesday, September 26, 2005 for foundation wall reinforcing
placement observations. These observations were made to confirm that all footing formwork and
footing reinforcing placement, and foundation wall reinforcing placement were completed in
substantial compliance with the direction, details and specifications noted on the foundation plan.
All footing formwork and footing reinforcing placement, and foundation wall reinforcing
placement were completed in substantial compliance with the direction, details and specifications
noted on the foundation plan.
Shear Engineering Corporation was present on Tuesday, November 1, 2005 and Wednesday,
November 2, 2005 for perimeter drain installation and foundation wall dampproofing
observations. Perimeter drain installation observations were made to confirm that perimeter drain
installation was completed in substantial compliance with the direction, details and specifications
noted on the foundation plan and in substantial compliance with the recommendations of the
geotechnical investigation report.
All perimeter drain installation was completed in substantial compliance with the direction,
detail and specifications noted on the foundation plan and with the recommendations of the
geotechnical investigation report referenced.
Dampproofing observations were made to confirm that dampproofing material and application
was completed ill substantial compliance with ASTM D-449 Type 11 and ASTM D-41
specifications and the federal specification SS-A-701. Dampproofing (DECO 20) was applied to
the exterior face of concrete basement walls that retain earth and enclosed habitable space. The
dampproofing was applied from the top of the footing to the assumed finished grade elevation.
Dampproofing coating material and application (DISSCO 521) meets the ASTM D-449 Type 11
and ASTM D-41 specifications and the federal specification SS-A-701.
If you have any questions concerning our observations, please call us at (970) 226-5334
Sincerely,
Richard D. Wagstaff
Shear Engineering Corporation
BWS / rdw
Revi
Brtrn W. Shear, P
Shear Engineerinc
cc: City of Fort Collins Building Department