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; � �er Zeman �ssociates. <br />Geutechnical and Environment�l Consulting � <br />\{rs. ��Iariivn Churchill <br />1010 Nortli Park Drivc <br />Everett, Washington 95203 <br />Subjcct: Supplemental �ieotechnical En�*ineerinc �rrvices <br />Rctaining Wall Rcplacement Projcct <br />Churcl�ill Residence <br />10(0 North Park Dri��c <br />Everett, �Vsshiugtun <br />Dear i�Irs. Churchill, <br />InU•oduction <br />l-1�01 <br />April 10, 3003 <br />In accordancc �vith your rcquest and autl�orization, Zipper Zcman Associates, Inc. (ZZA) <br />has completed a geotechnical evaluation of the timber pile retaining wall replacement plan <br />prepared by Chopelas & Associates, Inc. The replacement ptan was provided via fax and <br />indicated the removal of the existing timber wall and backfill �nd the construction of a ne�v <br />concrete retaining wall founded below the colluvium which �vill support a concrete sudaced <br />cantilever deck with counter balances. The purpose of our evaluation was ro review the proposed <br />plan relative to surface and subsurface condi:ions at thc site from which conclusions reeardi�e <br />the geotechnical feasibility of the plan and geotechnical uesien values for the proposed retaining <br />�vall (as requested by Chopelas Sc Associates, Inc) could be formulated. <br />Conclusions and Recommendations <br />General <br />The subsurtace conditions in dte vicinity of d�e existing timber pile �vall have been <br />evaluated on the basis of the proposed retaining wall replacement plan prepazed by Chopelas & <br />rlssociates, Inc., the engineering characteristics of the subsurface materials encountered at the <br />site, and the anticipated soil behavior bodi during and after construction. Based on the <br />informatio� obtai�ed from our exploration program, the project apoears geotechnically feasible <br />with respect to soil and �roundwater conditions encountered at the site. <br />However, it must be noted that the depth of the existing home and hot tub patio <br />foundations and the nature of the soils supporting these foundations is currentty unknown. The <br />anticipated cut depths to construct the proposed concrete wall coupled ��ith the proximity of the <br />existing home and patio could have an advers� affect on the exisang structures as a result of <br />constructing temporary slope cuts and may require miti�acive measures such as underpinning. It <br />may also be difficult to construct legal cut slope inclinations �iven the site coustrainu and soil <br />I H905 —73rd Avcnue W, Suite I 17 Lynnwaod. Washingron 96036 <br />J-isoi <br />(J25) 771 —3JQ3 <br />i� �/��� <br />