HomeMy WebLinkAboutOberservation of Excavation 04.26.23I(J;rtffi*-*
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Apnt26,2023
Ram Development
Attn: Bobby Almazan
P.O. Box 1387
Carbondale, Colorado 81 623
b*bbyli¿rramdcv. build
Project No. 23-7-157
Subject:tbservation of Pit Excavation, Proposed Garage, 38 F. Diamond A Ranch Road,
Lot D-45, Filing l, Aspen Glen, Garfielcl County, Colorado
Dear Mr. Almazan:
As requested, a representative of Kumar & Associates observed a pit excavatio¡r at the subject
site on Apnl 24, 2023 ta evaluate the soils exposed for foundaticn suppoü. Tlie findings of our
observations a¡cl recommendations for the foundation support are presentetl in this report. The
servicss were performed in accordance with our ägreement ftrr professional engineering selvises
to Ram Development clated February 1,6,2t23-
The proposed tliree car garage will be lneated off the norlhwest corner of the existing house.
The garage will be a tall, one-story, wood frame strusture with a slab-on-grade floor.
At the time of our visit to the site, a pit had been excavated near the southeastem comer of the
proposed garags. The soils exposed in the pit excavation consisted ofahout 1 foot oftopsoil anri
2 feet cf stiff, sandy, silty clay overlying relatively dense slightly silty, sandy gravel with eobbles
down t¡r the pit depth of 5 feet. No free water was abservcd in thc excavation and the soils were
moist.
Considering the conditicns exposed in the pit excavation and the nature cf the prnposed
construction, spread footings placed on the undisturbed natural stiff clay or gravel soils designed
for an allawatrie soii bearing prsssure cf!5!0+sf¡sLbe usçd for support of the propased
garage. Footings should be a minimum width of 16 inches for continuous walls and 2 f'eet fCIr
columns. Loose and disturbed soils in footing areas should be romoved and the bearing level
extended down to the undisturbed natural soils. Ëxterior footings should be provided with
adequate soil cover above their bearing elevations fcr frost protection. Continuous foundation
walls should be reinforeed top and bott<¡m to span loeal anamalies such as by assuming an
unsupported lengfh of at least 10 feef . Forurdation walls acting as retaining structur"es (if any)
shoulcl also be designed to resist a lateral earth pressurç based on an equivalent fluid unit weight
of at leasi 50 pcf for on-site sail as backfill. A perimeter foundation drain shsuld not be needed
for the proposed slab-on-grade tLoor construction. Structural fiil within flo*r slab areas
can consist of the on-site gravel soils or imparted toad base ccmpaeted ta at least 95% of
standard Prcctor density at a moisture eontent near optimum. Backfill plaeed around the
Ram Devekrpment
Apriï 26,2023
Page 2
should and the surface gr"aded to prevent ponding within at least 5 feet of
the building. V/e cornpleted garagö excavation.
The recornmendations submitted in this letter are based on our observation of the soils exposetl
within the pit excavation. The risk of foundation rnovement may be grsåter than indicateci in this
report beczuse of possible variations in the subsurface conditions. Our serv'ices do not include
determining the presenee, prevention or possibility of mold or othcr biological contaminants
(MOBC) developing in the future" Tf the elient is concerned about N{OBC, then a professional in
this special field of practice should bc consulted.
If you have arry questions or need fuither assistan*e, please call our oftice.
Sincerely,
â zs.stz*zr &. k * ** *i"*te*,
Daniel E. Hardin, P
DËHilcac
Kurnar & Åsçsci*t*s, lnc. s Projcct f{o" 23"7"1*7