HomeMy WebLinkAboutObservation of Excavation 5020 County Road 154 Glenwood Springs, CO 81601 phone: (970) 945-7988 fax: (970) 945-8454 email: kaglenwood@kumarusa.com www.kumarusa.com Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado March 6, 2025 Revised March 11, 2025 Stanley Bartlomiecjzuk c/o Jordan Architecture Attn: Brad Jordan 410 20th Street Glenwood Springs, Colorado 81601 bradjordanarchitect@gmail.com Project No. 22-7-472 Subject: Observation of Excavation, Proposed Dylan Thomas Residence, Lot F-10, Aspen Glen, 38 River Park Drive, Garfield County, Colorado Gentlemen: As requested, a representative of Kumar & Associates, Inc. observed the excavation at the subject site on March 3 and 5, 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 February 13, 2018, Project No. 18-7-118. The proposed residence has been designed to be supported on spread footings placed on dense gravel and sized for the recommended allowable bearing pressure of 2,500 psf. At the time of our initial site visit, the excavation was in progress and partly based in clay soil. When observed on March 5, the excavation was complete and had been cut in two levels from about 2 to 5 feet below the adjacent ground surface with about 1½ feet between levels. The soils exposed in the bottom of the excavation consisted of relatively dense, silty sandy gravel and cobbles with scattered boulders. No free water was encountered in the excavation and the soils were slightly moist to moist. The gravel soils exposed in the excavation are consistent with those previously encountered on the site and suitable for support of spread footings designed for the recommended allowable bearing pressure of 2,500 psf. Loose and disturbed soils should be removed in the footing areas to expose the undisturbed natural soils. The bearing soils should be protected from frost and concrete should not be placed on frozen soils. Other recommendations presented in our previous report which are applicable should also be observed. The recommendations submitted in this letter are based on our observation of the soils exposed within the foundation excavation and the previous subsurface exploration at the site. Variations in the subsurface conditions below the excavation could increase the risk of foundation movement. We should be advised of any variations encountered in the excavation conditions for possible changes to recommendations contained in this letter. Our services do not include