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HomeMy WebLinkAbout04.01 Subsoil Study for 4 Red Wing LaneHEPWORTH-PAWLAK GEOTECHNICAL February 12, 2016 Kirk and Jan Williams 04 Redwing Lane Carbondale, Colorado 81623 Hepworth-Pawlak Geotechnical, Inc. 5020 County Road 154 Glenwood Springs, Colorado 81601 Phone: 970-945-7988 Fax: 970-945-8454 email: hpgeo©hpgeotech.com Job No.116 012A Subject: Subsoil Study for Foundation Design, Proposed Garage/ADU, Lot 4, Hawkridge, 04 Redwing Lane, Garfield County, Colorado Dear Mr. and Mrs. Williams: As requested, Hepworth-Pawlak Geotechnical, Inc. performed a subsoil study for design of foundations at the subject site. The study was conducted in accordance with our proposal for geotechnical engineering services to you dated November 11, 2015 and received by us on January 22, 2016. The data obtained and our recommendations based on the proposed construction and subsurface conditions encountered are presented in this report. Hepworth-Pawlak Geotechnical, Inc. previously performed a subsoil study for the existing residence and reported our findings December 9, 1998, Job No. 198 776. Proposed Construction: The proposed garage /ADU will consist of a one story living area above a walkout level garage with an entry and mudroom. The building will be located about 60 feet north of the residence as shown on Figure 1. Ground floor will be slab -on -grade. Cut depths are expected to range between about 3 to 6 feet. Foundation loadings for this type of construction are assumed to be relatively light and typical of the proposed type of construction. If building conditions or foundation loadings are significantly different from those described above, we should be notified to re-evaluate the recommendations presented in this report. Site Conditions: There was about 18 inches of snow cover at the time of our field exploration. The property is occupied with a one and two story wood frame single family residence above a partial crawlspace and partial slab -on -grade floor. Vegetation consists of grass and weeds. The ground surface slopes down to the southwest at a grade of about 10 percent. The building area was graded during construction of the residence and is relatively flat. An irrigation ditch is located uphill and about 120 feet east of the building site. Subsurface Conditions: The subsurface conditions at the site were evaluated by excavating two exploratory pits at the approximate locations shown on Figure 1. The logs of the pits are presented on Figure 2. The subsoils encountered, below about 6 Parker 303-841-7119 • Colorado Springs 719-633-5562 • Silverthorne 970-468-1989 -4 - This report has been prepared for the exclusive use by our client for design purposes. We are not responsible for technical interpretations by others of our information. As the project evolves, we should provide continued consultation and field services during construction to review and monitor the implementation of our recommendations, and to verify that the recommendations have been appropriately interpreted. Significant design changes may require additional analysis or modifications to the recommendations presented herein. We recommend on-site observation of excavations and foundation bearing strata and testing of structural fill by a representative of the geotechnical engineer. If you have any questions or if we may be of further assistance, please let us know. Respectfully Submitted, HEPWORT - PAWLAK GEOTECHNICAL, INC. ouis Eller Reviewed by: Daniel E. Hardin, P.E. LEE/ksw attachments Figure 1 — Location of Exploratory Pits Figure 2 — Logs of Exploratory Pits Figures 3, 4 and 5 — Swell -Consolidation Test Results Table 1— Summary of Laboratory Testing cc: Brian Golden (bg@twosevenink.com) Job No.116 012A GE itech