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HomeMy WebLinkAbout626 S. WHITCOMB FOUR-PLEX - PDP/FDP - FDP140023 - SUBMITTAL DOCUMENTS - ROUND 1 - GEOTECHNICAL (SOILS) REPORT7--LOGIC June 11, 2014 Anderson Associates Architectural Engineers, LLC 422 East Oak Street Fort Collins, Colorado 80524 Attn: Mr. Dick Anderson Re: Proposal for Openhole Observation 626 South Whitcomb Street — Duplex Addition Fort Collins, Colorado Mr. Anderson Thank you for the opportunity to submit this proposal to provide openhole observation services for the referenced project. To complete an openhole observation, Soilogic Inc. (Soilogic) personnel would advance two (2) hand auger borings to a depth of approximately 3 feet below proposed basement foundation bearing elevation or to auger refusal, whichever results in the lesser excavation depth. Dynamic cone penetrometer tests would be completed on the exposed subgrade soils to help evaluate the consistency or relative density of the foundation bearing materials. Swell/consolidations tests would be completed on selected soil samples obtained from the open excavation to evaluate soil volume change potential with variation in moisture content. After completing the outlined field evaluation and laboratory testing, Soilogic would prepare a written report summarizing the results of the completed field and laboratory testing. Verification of the allowable soil bearing pressure used in design of the footing foundations would also be completed. Soilogic would provide the scope of service outlined above for a lump sum fee of $500. We look forward to the opportunity to work with you on this project. Our Standard Terms and Conditions for providing the outlined services are attached and considered part of this proposal. If you have any questions concerning the included information or if we can be of further assistance to you in any way, please do not hesitate to contact us. Very truly yours, Soilogic, In . Y Wolfram von Caz witz, P.E. Principal Enging& Soilogic, Inc. 3050 67 h Avenue, Suite 200 • Greeley, CO 80634 • (970) 535-6144 P.O. Box 1121 • Hayden, CO 81639 • (970) 276-2087 Project: 626 S. Whitcomb Street — 4 Plex Soils Report: Having extension experience in the West Side neighborhood, our intent is to verify the soils at the time of excavation for the garden level duplex addition. The West Side neighborhood has consistently demonstrated brown to reddish brown lean clay with varying amounts of silt and sand. Table R401.4.1 of the International Residential Code provides a Load -Bearing Pressure for lean clay with varying amounts of silt and sand. We propose to use the bearing pressure identified in the Table R401.4.1 with a minimum dead load of 500 psf for the possibility of low to moderate swell. We will have the geotechnical firm, Soilogic, perform an open hole observation upon the completion of the lower level excavation. The results of Soilogic's completed field and laboratory testing will be followed for the final foundation design of footing, pads and foundation wall design. See Soilogic June 11, 2014, letter attached.