HomeMy WebLinkAboutObservation of Crawlspace Excavationrcn $',',ffi.*ffi#rnl'rvi*'"
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
email: kaglenwood@kumarusa.com
wwwkumarusa.com
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Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
June 18,2025
Maria Ruiz
2307 Road 154,Trailer #1
Glenwood Springs, Colorado 81601
rocioruiz2307@ hotmail.com
Project No.21-7-740
Subject Observation of Crawlspace Excavation, Ruiz Residence, Tract2, Holgate Parcels,
2498 Highway 133, Carbondale, Colorado
Dear Ms. Ruiz:
As requested, a representative of Kumar & Associates, lnc. observed the crawlspace
excavation at the subject site on June 16, 2025 to evaluate the soils exposed for foundation
support. The findings of our observations and recommendations for the foundation design are
presented in this report. We previously conducted a subsoil study for design of foundations at
the site and presented our findings in a report dated December 15,2021, Project No.21-7-740.
The residence is above a crawlspace about 5 feet deep and supported on continuous, perimeter
spread footings and interior pad footings.
At the time of our visit to the site, two areas of the vapor barrier had been removed to expose
the bearing soils next to the north perimeter foundation wall and a pad footing in the south part
of the crawlspace. The soils exposed in the open areaS consisted of silty clayey sand with
scattered gravel. Results of laboratory testing performed on a sample taken from the exposed
soils are presented in Table 1, No free water was observed in the open areas and the soils
were slightly moist to moist.
The soil conditions exposed in the open areas of the crawlspace are consistent with those
previously encountered on the site and suitable for support of spread footings designed for the
recommended allowable bearing pressure of 1,200 psf.
The findings and recommendations submitted in this letter are based on our observation of the
soils exposed in the crawlspace and the previous subsurface exploration at the site. Variations
in the subsurface conditions below the excavation could increase the risk of foundation
movement. Our services do not include determining the presence, prevention or possibility
of mold or other biological contaminants (MOBC) developing in the future. lf the client is
concerned about MOBC, then a professional in this special field of practice should be consulted.
lf you have any questions or need further assistance, please call our office.
Sincerely,
Kumar & Associates,
Steven L. Pawlak, P.E.
SLP/kac
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Attachment: Table 1 -Test Results
l(+rt lftmr & Asclates,lnc.o
Geotecfinical and Materials Engineers
ard Environmental Scientists
TABLE 1
SUMMARY OF LABORATORY TEST RESULTS
Project No.21-7-740
sorl oR
BEDROCKTYPE
Very Silty Clayey Sand with
Gravel
UNCONFINED
COMPRESSIVE
STRENGTH
{PSF)
ATTERBERG LIMITS
PLASTIC
INDEX
P/"1
LIQUID
LIMIT
(o/ol
46
PERCENT
PASSING
NO.200
SIEVE
NATURAL
DRY
DENSITY
GRADATION
GRAVEL SAND
(%)(v")
110
NATURAL
MOISTURE
CONTENT
lo/"1
11.7
SAMPLE
LOCATION
CRAWLSPACE
GRADE
North End