5505 BROADWAY RECORDS STORAGE ONLY 2016-01-01 MF Import

Battermann Geotechnical Consulting Ju�y 25. 2oa� PLLC Pr�jcct No. 0G04A Mr. Robcrt I lalvcrsun 3519 Wetmure Avcnu�, Apt. f3 Gvcrctt, WA 98201 Suhject: Addcndum lo Subsurface Exploration and Gcotechnical Enginccring Rcpon I�alverson Property SGxx Droadway Gvcrett, Washington l�hc follo�ving addcndwn lctter is a supplcmcnl to our Subsurf�cc Bxploration, Gcologic I l:�ards, and Geotechnical Engineering Report for thc Halvcrson Pro�xrty dated Octotxr 4, 2Q06. Whcre in conflict,the recommendations in this Icttcr supersede the recommcndations contained in that rcport. 7'hc original plan for development of a single family msidcnce on this sitc reyuircd thc consWction of a 20 to 25 foot high retnining wall in order to provide a building pad high cnough on the ptvperty ihat an access driveway ofTof Broadway Avenue was ieasiblc. In the intcrvening months, it is our understanding that you hav�had mcetings w:th both your neighbors to thc norlh and with Ihe City of Everett. The current proposal is to devclop a building pad hy cons.n�ctio��of a structural fill that will also benefit and extcnd onto the neighbors property. I�rom a gcotechnical engineering stEu�dpoint,this is n much preferreci altemauve than conslruction of the large wall. IIattennann Geotechnical Consulting,pllc is in full support of;hc grading plan to fill the old erosional ravine between the two propedies with st�vctural fill. Thc rccommendations in this addendum lerier addre�s the geotcchnical engineering considcrauons nccessary to complete ihe proposed grading. 'I hc cxisting fill soils and loose,slope colluvial soils will necd to bc removed from thc areas to reccive structural fill.The non-organic portions of these materials may be re-used in the new s(ructural till. The��ibgrade soils shall be in a medium dense condition prior to placing ncw fill. '1'hc existing culvcrt undet Broadway Avenae should be extended bcyond the plenned toc of thc ncw structurul fill body. The new culvert should be bedded on a layer of pca�vel and dicii m.�y Ue rlled over during the placement and compacGon of the ncw fill. The culvert should bc set to discharge on a rock splash pad comprised of minimum 12 inch diameter quarry spatl rock , that is embedded into native subgtade so the top surfacc of the rock is at existing grade. Thc rock pad should be a minimum of 4 feet widc and 6 fect long. Construction of the new fill should starl at the toe of the slope and work up the slo�x. Thc lill shall be placed horizontally. Fill soils shou;d bc placed in litt�not to excced 10 inches thick. I?ach liti shall be compacted to a minimum of 95 percent of thc modificd Proctor value of thc fill soil. Dcnsity testing should be performed to vcrify suitablc compaction of the fill soil. As thc _ f3GC, PLLC 14267 209°i Avenue NE Woodlnvllle, WA 9607? (425) 273-5062 /�/3 �