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��� <br />H <br />>Hy <br />H�� <br />1! O <br />�,1H� <br />y <br />xp <br />H <br />OHd <br />��g <br />I7Y C] <br />t"y� <br />HH <br />gy <br />C1 � V� <br />�H� <br />HOp� <br />i ` <br />C <br />� <br />� <br />DAVID !. NELSON AND ASSOCIATES, INC. <br />Consulting Engineering Geology <br />13424 Chain Lake Road <br />September 22, 1987 <br />Project No. 11387 <br />Oavid L. Bigelow <br />29206 - 64th Avenue NW <br />Stanwood, Washington 98292 <br />Monroe, Washington 98272 <br />Reference: Consultation Services-Soils <br />Open-Hole Pier Instal!ation <br />Triada Granada, LoCs 2& 3 <br />E�rerett, Washingto. <br />206/788-5612 <br />20617944332 <br />���f�0�1�� <br />SEP 2 o 5�3� <br />EVEP,ETT BUILDIP;G D�PT. <br />Dear Sir; <br />On September 18, 1987> we observed open-hole pier installation within the above <br />'�1 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 lot 2 and 19 within lot 3. The <br />'�1 piers were nominally 16" diameter and filled with concr2te up to desired grade. <br />Piers �aere 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 found. Four of the holes encountered ground water; <br />1 lot 3#7, 9� 11, and lot 2#18. We observed concrete placement within these four <br />holes to see that water was forced from the bottom (flushed), but other holes were <br />' not observed for concrete placement. Reinforcing ;aas to bedetermined by others. <br />We have enclosed a tabulation of depths for each pier installed. These depths <br />�' corr.espond to elevations below prepared ground surface at the time of pier <br />� installation. We ha��e also included a map showing the pier number for each lot <br />�,� area, and can be used to locatP piers as numbered on the depth tabulation. <br />y� The area indicated as the 'lower terrace' in lot 2 is approximately 2' below <br />• the area indicated as the 'upper terrace' in lot 2. <br />' It is our opinion that each pier has been installed adequately to achieve the <br />�1 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 abpve•inFormation <br />is of use. If you have any questions, feel free to call on us`;'at a�)L•�?E�P�y`�.��' <br />Sinc ely, <br />DAV �t E & ASSOCIATES, INC. <br />D vid L. Nelson, PG <br />Professional Engineering Geolo9ist <br />DLM:kmn <br />.a <br />i O�\\ ��p WASH/, <br />? <br />� � � <br />� , r'�e <br />r�,. <br />�. Keith Cross, PE°a �� '�� <br />Geotechnical Engin�i�rt3�4R5� <br />to David L. Nelson Flc�t�4+3e'f��;mC� <br />