HomeMy WebLinkAboutEngineer's Memo - Foundation 02.27.2020Design Criteria:
Code Edition:
RECEIVED
GARFIELD COUNTY
COMMUNITY DEVELOPMENT
2015 IBC/IRC
Dead Loads: Live Loads:
Roof 25 psf (5 psf Solar Collateral) Roof
Floor 15 psf Floor
Lateral Loads:
Basic Wind Speed:
Exposure:
Risk Category:
Seismic Design Class:
115 mph (3 second gust)
C
I I
Exempt (ASCE 11.1.2.1)
40 psf
40 psf
Foundations:
A. Foundations have been designed based upon values found in report #19-7-258 by Kumar and Associates, Inc. dated
05/17/2019.
B. Continuous concrete footings and foundations are based upon a maximum, non -expansive, allowable bearing
pressure of 2000 psf (dead load plus full live load), an active lateral pressure of 45 pcf, an at rest lateral pressure of
55 pcf and a passive lateral pressure of 350 pcf. Foundation construction may not proceed without verification of
these values. If discrepancies exist in actual site conditions notify FOR for review.
C. All footings shall bear on firm, undisturbed natural soil or properly compacted structural fill in accordance with the
recommendations of the geotechnical engineer including proof -rolling and over -excavation as required. All footings
are to bear a minimum of 36" below exterior grade. Center all footings under walls, columns or grid lines unless
otherwise noted on plans.
D. Avoid excessive wetting or drying of the excavations, keeping the excavation reasonably free from water during
placement of concrete. Provide continuous perimeter drains around the base of foundation and retaining walls.
Refer to geotechnical report for specific under -drain system requirements.
E. Backfill shall be compacted to meet a 95% minimum standard Proctor density per ASTM D-1557 unless otherwise
noted in the geotechnical report. Backfill shall be placed in 12" maximum vertical lifts or as detailed in the soils
report and shall be free of deleterious material and compacted in a manner that does not damage the foundation,
waterproofing or damp -proofing material. If soft spots are encountered contractor shall remove material and
re -compact w/ approved material (RE: soils report) Finished grading shall drain away from the foundation wall at a
minimum of 5%.
F. Do not backfill against lower level walls or walls in retaining until all supporting elements are in place and properly
anchored or adequate shoring is installed. Concrete slabs shall be properly cured.
G. Contractor shall retain a licensed geotechnical engineer to verify soils conditions during excavation. Verify any
discrepancies from the original values in writing to structural engineer for re-evaluation of the foundation design.
Reinforced Concrete.
A. All structural concrete had been designed in accordance with ACI 318-14. All structural c c■ struction work
shall conform to ACI 301-10 (or latest edition) unless noted otherwise.
B. Cast in place concrete shall be made with type I/II sulfate -resistant cement to maintain the following requirements,
admixtures containing chloride salts shall not be used.
one design
engineering consulting
POST OFFICE BON 2121
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TITLE
SOILS REPORT UPDATE
0
PROJECT
CARDENAS RESIDENCE
LOT 29 - SUN MEADOW ESTATES
TOWN OF RIFLE, CO
02/27/2020
REVISED GENERAL NOTES FOR SOILS REPORT INFO
!ASV
PAW
09/05/2DI9
ISSUED FOR PERMIT
M5V
MSS
Na
DATE
DESCRIPTION
BY
CHK
SCALE
3/4" = 1'-0"
JOB. Ha
19013
1 0
SHEET NO.
REV 1.1
STRUCTURAL ENGINEERING - CIVIL ENGINEERING - ARCHITECTURAL DRAFTING - 3D MODELING