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HomeMy WebLinkAboutBuilding Miscellaneous 2014-6-2 r June 2,2014 Mr. John Thompson Breeden Homes , via email: John @brccdcnhomcs.com RE: SOILS AND FOUNDATION CONDITIONS, 3654 VITUS LANE, RIVER HEIGHTS Dear Mr. Thompson: I.am writing this letter to present the results of our verification of soils and foundation conditions at the future site of 3654 Vitus Lane in the River Heights subdivision.Per the 8/13/2007 GeoScience . Report,this lot is located in Design Area DA-2,with hard,fractured RU-101 (igneous rock)located below I to 2 feet of SU-D, a gravelly, sandy lean Clay. The site was visited on May 30, 2014 after the foundation excavation had been completed. The entire lot had been excavated to depths ranging from 12 to about 18 inches. The floor of the foundation excavation consisted entirely of fractured stained state(STS)to visually fresh state(V FS) RU-I 01. The excavator had encountered refusal throughout the excavation. This inconsistent with DA-2. Based on the observations and measurements of the Unconfined Compressive Strength of in-place. RU-101 (greater than 9.000 psf), and using the Bell-Casagrande Method, the ultimate bearing capacity of the foundation material is greater then 18,000 psf. Using a factor of safety of 3 for dead and live loads, the allowable bearing capacity is 6,000 psf. Therefore, the foundation design(for maximum bearing pressures of 1,500 psf) is conservative. If you have any questions regarding this matter, please do not hesitate to contact me at(541) 607- 5700. Sincerely, GeoScience, Inc. / , (61- 1E/EO'1 e? q —� REGON aa scale Gunnar Schlieder, Ph.D., CEG �� tt E1139 CO 4� d'.7. e, S"ENG GAO. Expires 12/31/2014