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2004, 12-09 Summary of Obsevations CorresIS T R a T ik DFOTtOwNI{,Al 4NCONEIRiNO A DA&Te ilAl11 tI31 NO 10070 Ealp+ rho, a+h,w. Nil* 270. SpaAy s. WA 1.471224 emi4,4-1voel►Lagoo von -70+7 wwaronpwlaCALcoT. Building Department Spokane Valley c/o MOS Shuler P.O. Box 1207 Davenport, WA 99122 Building Department: December 9, 2004 File No: S04045A RE: LETTER Addendum Summary of Observations and Opinion 1201 Custer — Woodland Terrace nokane Yellvy, Washir&torl_ This letter addendum presents our estimate of potential settlement of the proposed borne to be located. at 1201 Custer. We previously provided a summary of our observations and opinions regarding the proposed building lot in am letter dated December b, 2004. Based on a site visit we made on December 8, 2004, we observed that footing subgrade has become we and soft especially along the north footing line. Vowing subgrade should be firm and unyielding prior to concrete placement of footings. We recommend that soft soil at footing subgrade be overexcavated to firm bcanng and the footings be extended down to Scar on firm and unyielding soil. We should be retained to observe subsurface conditions during the overexcavation. Provided that ,foundation bearing surfaces are firm and unyielding, we estimate total settlement to be less than 1 inch. Differential settlement across the width of the house should he less than about '4 ftuh. Z0 3Jt7d Sincerely, STRATA, Inc. Geotechnical Engineer 51261/4„ Chris Sneider, P.E- C3cotcchniaal Engineer IDAHO • WASHINGTON OREGON WYOMING MONTANA UTAH NEVADA H31f1HS Sal 6Z0EZ9V 9Z :5Z V00Z /60/ZZ SI R a T a GEOTECHNICAL ENGINEERING & MATERIALS TESTING 10020 East Knox Avenue, Suite 200, Spokane, WA 99206-4748 509 891-1904 / Fax 509 891-2012 Building Department Spokane Valley c/o MDS Shuler P.O. Box 1207 Davenport, WA 99122 ATT: Building Department: December 6, 2004 File No: S04045A RE: LETTER Summary of Observations and Opinion 1201 Custer — Woodland Terrace Spokane Valley, Washington We are providing this letter to summarize our field observations and testing and opinions regarding the above lot at the Woodland Terrace project in Spokane Valley, Washington. The project is located on a cul-de-sac at the address 1201 Custer Street. The majority of the lot is located on relatively level terrain. The topography at the north end of the lot slopes moderately downward toward the north. Vertical fall from the north edge of lot to the base of the slope is about 18 feet with a slope inclination ranging from about 1-1/2H to 1V (horizontal to vertical) to 1-3/4H:1V. The face of the slope has been armored with large boulders of granite. On November 24, 2004, an engineer from STRATA visited the site to discuss with you foundation preparation for this lot. Based on our observations, the majority of foundations at this lot do not require geotechnical provisions, provided the design and construction of foundations conforms to the 2003 International Building Code (IBC). At the time of our November 24, 2004 site visit, STRATA made recommendations that the footings along the north side of the lot adjacent to the descending slope needed to be deepened in order to comply with the 2003 International Building Code for setbacks of foundations adjacent to descending slopes. On November 29, 2004, a representative of STRATA visited the site to observe corrections made to the foundations based on our recommendations. STRATA found during that site visit that the foundation soils were firm and compact and conform to the intent of STRATA's recommendations. STRATA also observed that foundations at the north end of the lot had been deepened to conform with the depth and offset requirements of the 2003 International Building Code. IDAHO • WASHINGTON • OREGON • WYOMING • MONTANA • UTAH • NEVADA Summary of Observations and Opinion 1201 Custer — Woodland Terrace Page 2 of 2 To the best of our knowledge, fills placed for this lot meet the intent of our geotechnical recommendations made in previous reports. Further, foundations observed at the site including foundations at the north end of the site were observed to conform with the minimum code requirements for both setbacks and bearing pressure required by the 2003 IBC. We trust this information is sufficient for your present needs. Please contact the undersigned if you have any questions regarding this letter. (EXPIRES 7/17/ Df SRW/CAS:dpn Sincerely, STRATA, Inc. Scott R. Ward, P.E. Geotechnical Engineer Chris Sneider, P.E. Geotechnical Engineer s T R a T a i GEOTECHNICAL ENGINEERING 8 MATERIALS TESTING