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Sent By: 2ipper 2eman Associates� Inc.; JetSuite; May-12-99 18:05; <br />Zi�a� Associates, Inc. <br />Geotechnical end Environmmtel ConsultinY <br />CG Engineering <br />111 Main Street, Suitc la6 <br />Edmonds, Ws9hingcon 96020 <br />Attrntion: Mr. JeffHaynes <br />5ubject: Geotectwical Considerations <br />- Reinforced Fill Embanlmient <br />- S�eCe Wacer Management Pond <br />Rodland Toyota Used Vehicle Lot <br />Evergreen Way <br />Evaet� Washington <br />Dear Jeff: <br />Page 2 <br />J-237-10 <br />12 May 1999 <br />As per your 10 May 1999 request, Zipper Zeman Associates, Inc. (ZZA) hes reviewed <br />your pien sheet C2.1, and a dctail for the proposed surface water mana8emen� Poad, for the <br />Rodland 7oyota uud vehicle lot located on Evergreen Way iu Everett, `Neshic�toa Provided <br />hcrein are recommendations regarding rockery end fill embani�ent const:ucdon, ns we11 as the <br />praposai surface watez managemen� Pond. <br />Roclury and Fill Embanlrment Coavideradone <br />The plans show :hc incorporation of rockeries along the perimeter of about the north hx(f <br />of the site. The rockeries wiU be up to approYimacdy 8 fect lugh. Ptoposed gradcs show thet the <br />mckaies will be constructed s�ainst fill matcriel. Asphalt pavement will bC instulled on the fill <br />sur{aces above the rockeries for vehicle storage purposes. We recommend that tho rockeries face <br />fill embankments which are ieinforced with n geogrid materisl. The use of a savctural fill <br />embanlmient reinforced with a BeoLmd material will enhance the stabiliry of the embea�ents <br />and reduce thc potmtinl for rockery dist�s.ts• The rockeries themselves shoul.d be constructed in <br />accordance with Ciry of Ever�tt standnrds� as shown on plan shcet CZ.1, <br />It is our recommendation that the on-site soil fill materisl wtuch is frce of deleterious dehris, <br />end ac a moisture content wtuch allows its compaction to at least 90 percrnt drnsity (ASTM: D- <br />155�, be utilized to coastruct the fill embankmcnts. Each lift of fill should be mechanically <br />comQacted. It is our tecommcndation that smaller, hand-operated compnction equipment be <br />utilized within the area �ctending from the back of the rockcry facing rocks a distance of <br />appro�cimately 6 feet in order to avoid the operation of larger, self-proPelled vibratory equipment <br />too close w the rockcry. "fhe swettual fill should be placed under the observation of a ZZA <br />rcptesentative. <br />'Ihose portions of the site which include rockeries 4 fect or trigher should be constructed <br />adjacmt to fill embstilmients incorporeting geo�-id reinforcement 'Ii�e enclosed Generalized <br />the 5U embF,enkmentsarccoemmendred b�eehindc he proposed rock�es �The ettn hed tabk pro�vides <br />wmlin 98�36 (47.5) 773 -3]04 <br />I973I76�AvenucWa4SuiieB201 L}nc�ooE. f� <br />