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John P. Vardanen, P.E. structural Enidneer <br />January 28, 2000 <br />Mr. Joe Dawson <br />Omni Homes, Inc. <br />11122 99d Avenue NE <br />Arlington, WA 98223 <br />let Deck Footings for Mahan Residence. <br />Dear Joe: <br />M9 @ � 9 V R M <br />00-169 <br />JAN ! 12= <br />diTY OF EVERETT <br />Permit Services <br />As we discussed prior to construction, the deck posts at the rear of the structure would require <br />excavation to bearing soil for placement of conventional spread footings, or pin pile foundations <br />could be installed. Given the site conditions, limited equipment access, and the depth to bearing <br />along the rear of the structure, pin piles were the preferred option. Points of discrtssion are as <br />stated in the following paragraphs. <br />Pin piles consisting of a group of three 2 inch diameter standard wall steel pipe at each deck post <br />location were to be installed. Galvanized pipe was not required. The piles were to be splayed <br />into a tripod configuration, with two piles placed away from the building foundation and one <br />toward the building. The three piles were to be connected with a concrete cap footing a <br />minimum of 12 inches thick. A short section of #4 rebar passed through a hole drilled crosswise <br />in the top of each pile would connect the cap to the piles. Three #4 rebar each way reinforce the <br />cap footing. A standard post bracket set in the top of the footing completes the assembly. <br />Piles are driven to "refusal" using a 90 pound jack hammer. Refusal is defined as less than 1 <br />inch of penetration of the pile into the soil after 1 minute of full hammer. Each pile is <br />considered to have an allowable axial capacity of 2 tons. These are standard values for this type <br />of installation. Since deck loads for this structure are considerably less than the capacity of the <br />three -pile groups, special inspection during installation was considered unnecessary. <br />If you have any questions regarding the above, please call me at (425) 334-1831. <br />Sincerely, <br />stole <br />John P. Vardanegn, P.E. <br />Structural Engineer <br />JPV/jv 00-169 Omni • Mahon <br />V EXPIRES I/ .l <br />16332 Dubuque Road Snohomish, Washington 98290.4774 Phone: (425) 334-1831 <br />