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1 <br />LJ <br />, <br />' <br />' <br />, <br />' <br />1 <br />1 <br />1 <br />' <br />1 <br />� <br />' <br />1 <br />, <br />' <br />1 <br />' <br />Geotechnical Engineering Letter <br />Alhussaini Slope Stabilization and Retaiiiiug Walls <br />Everett, Washiiigton <br />NGA File No. 867612 <br />Dece�nber 10, 2012 <br />Page 13 <br />feasible. All coinpaction should be accomplislled by equipnleut of a type and size sufficient to <br />attain the desired degree of compaction. <br />If ��-ound water scepage is encountered or if excessive rainfall occurs durin� construcCion of <br />spccific aspects, we recommend tllat the contractor slope thc bottoul of tlle exc�vations atid direct <br />the water to ditches aiid s�uall sump pits. The collected water can tl�eu be directed t�o a suitable <br />discharge point at the bottom of the slope. <br />USE OF THIS LETTER <br />This letter has been prepai-ed for Ahmed Alhussaini and his a�ei�ts for use in the planning of the <br />slope i�nprove�nents and retaining walls on tliis site only. The scope of our work does not i�lclude <br />services related to construction safety precautions and our recommendations are not intended to <br />direct the contractors' methods, techniques, sequences, or procedures, except as specifically <br />described in our letter. There are possible variations in subsurface conditions between tlle <br />exploratioiis and also witll tinle. Our letter, conclusions, and interpi-etations should not be <br />consti-ued as a wai-i-anty of subsui-face conditio�is. /\ contingency for unanticipatcd coilclitioils <br />should be included ii� the budget aud schedule. <br />We sllould be retained to i-eview iinal slope improvement, wall layout and consti-uction pl�lns <br />prioc to breaking ground. It is critical that tl�e design incoiporates all of the reco�umendations <br />provided in this lettcr. Failing to do so could easily create conditious for a global landslide that <br />would atfect all oi� the new walls and lalldscaping. We also recommend tllat NGA be r-etained to <br />pr-ovide nionitoring a�1d consultation seivices during consti-uction to confirm tllat tl�e conditions <br />encountered are consistent with those indicated by tlle explorations, to provide reconmzendations <br />for desigil changes should the conditions cevealed during the work differ from those anticipated, <br />and to evaluate whether ar not retaining wall installation complies with our recomnlendations. <br />We should be coiitacted a minimum of one week prior to construction activities. <br />All people who own or occupy homes on or ue�r hillsides should realize that landslide <br />moveinents ai-e always a possibility. The landowner should periodically iiispect the slope, <br />NELSON GEOTECHNICAL ASSOCIATES, INC. <br />