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� <br />DAVID !. NELSON AND ASSOCIATES, INC. <br />Consulting Engi�ieering Geology <br />13424 Chain Lake Road <br />�4u <br />�:�'�v. <br />September 22, 1987 <br />Project No. 11387 <br />David L. Bigelow <br />29206 - 64th Avenue NW <br />Stanwood, Washington 98292 <br />Monroe, Washington 98272 <br />Reference: Consultation Services-Soils <br />Open-Hole Pier Installation <br />Triada Granada, Lots 2& 3 <br />Everett, Washingto. <br />206/788-5612 <br />2061794-4332 <br />���r�o��� <br />SEP 2 9 �°�? <br />EUERETT BUILDING DFPT. <br />Dear Sir; <br />On September 18, 1987, we observed open-hole pier installation within the above <br />referenced project sites, as requested by you. These piers are intended for <br />support of residence foundations due to existing unsuitable soil conditions. <br />A total of 40 piers were installed, 21 within :ot 2 and 19 within lot 3. The <br />piers were nominally 16" diameter and filled with concrete up to desired grade. <br />Piers were placed within locations provided by you and penetrated a minimum of <br />4' into the underlying hard silt where found, and 5' into the medium dense to <br />dense sand and gravel where faund. Four of the holes encountered ground water; <br />lot 3#7, 9& 11, and lot 2#18. We observed concrete placement within these four <br />hoies to see that water was forced from the bottom (flushed), but other holes were <br />not o�served for concrete placement. Reinforcing �aas to bedetermined by others. <br />We have en:losed a tabulation of depths for each pier installed. These depths <br />correspond to elevations below prepared ground surface at the time of pier <br />installatior;. We ha��e also included a map showing the pier number for each lot <br />area, and car be used to ]ocata piers as numbered on tiie depth tabulation. <br />The area indicated as the 'lower terrace' in lot 2 is approximately 2' below <br />the area indic:ated as the 'upper terrace' in lot 2. <br />It is our opinion that each pier has been�installed adequately to achieve the <br />10-12 ton per pile design capacity as required on the approved plans and the <br />specifications. <br />Thank you for the opportunity to be of service, and trust the abaae�information <br />is of use. If you have any questions, feel free to call on us"at a��y•!�.�� <br />Sinc ely, <br />DAV E & ASSOCIATES, INC. <br />D vid L. Nelson, PG <br />Professional Engineering Geologist <br />DLN:kmn <br />�� �' <br />. Keith Cross, <br />Geotechnical Eng <br />to David L. Nels <br />