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� M (T45.11��': -11 <br /> � W�,a� � q.d�vvr 1'� <br /> � � <br /> � � � SHANNON & WILSON, INC. <br /> � Geo!echnicai Consu��ants <br /> �°a � ro Engineering and Applied GeosNPnces <br /> i <br /> � � � 1105 North 38th Sireet • P.O. Box G30313 • Seatlle, WA 98103�8067 • (2(16!692AOn1 ' Cable. GEOSAW <br /> I <br /> A � w-a9ao.o� � <br /> M � � ]une 1G, 19RR �, <br /> t' y <br /> �, Grav & Osb�irnc, Inc., V.S. <br /> � o N 701�Dexter Avenue Nonh, Suite 200 <br /> � � Scattle,WA 98!09 <br /> � N A t tn: 1�1r. Ton y Vi�ulo,P.E. <br /> GEOTGCHNICAI. REPORT, FROPOSGD SILVGR LAKF•. RESER�'OIR, <br /> SN0110�11SH COUnTY, R'ASHINGTOti <br /> pro�p�ed neHe�+'ter resen oir fur he 5 lner Lake�ateraD�vict d7 he neunWnk w u�ld be just <br /> nonheast of the corner of 1(K)th Sveet SE and 23rd Avenue SE. The purpose of our Nork aas <br /> to assist you vrith the @eo�echnical ponions of the aater t:+nk design. The scope of our sen�ices <br /> included the IogEing of test pits at the site,laboraton� testing and preparation o(this repon. <br /> . <br /> Our aork µas authonxcd in a Ieuer dated April R, 19R8 Gom P.1r. b'i�rolo. <br /> I C� �i�� �nd Proicct Descnntion <br /> 1 The proposed water reservoir uould be located about 380 fcet nonheast of the intersection of <br /> �� 100th Sveet SE and 2?rJ Avenue SE in Snohomish County,VJashington, as indicated on the <br /> ��� Vicinity Map figure 1. The si�e is relatively le��el, siivated in a saddle from µhich the grnund <br /> surface falls aw�ay very gently�o the east and west. The site was cleared in the past,leavin@ <br /> only a few scattered vees. Dcnse briers and undergrowth are present throughout the sire. Piles <br /> ' of soil have becn placedjust nonheast o(the tank lixation. <br />, ! ��� <br /> The proposed structure u-ould be on the southeast ponion of die site, as shoKn on the Siie <br /> plan, Figure 2. It would be a 4.2 million gallon, 130-foot di�meter sicel twnk, founded on a <br /> concrcte ring wall. The resen�oir would Fx covered and approsimaicly 65 (eet high. <br /> �� Appunenam facilities would include access roads and a pump house. <br />' F�pinr+tinnc �nd L:ihnr;��orv Tes�inc <br /> � The siie H�as explored M- mcans of four test pits(designated TP-1 through TP•4j Nhich Here � <br /> ��� ezca��a�ed uith a rubber•tired hydraulic backhoe. 'I�he approximate locations of�he iest pits ur� <br /> shoµ�n on Figure 2. i <br /> ��-� The pits were dug with a backhoe pro��ided by the Silver Lake �1'ater Disvict on Apn1 11' <br /> 1988. They ranged in depth from abo�t 9 to 10 feet. Test pit excavation was obscrved nnd <br /> directed by a geologist from our firtn who visually identified the exposed soiis,obtained <br /> reprcsentative soil samples, and compiled a log of each exploration. Logs of the test pits are <br /> � � presentcd on Figures 3 throu@h 6. Soil relative de�isities presentcd on the tat pit lo€s were <br /> estimated based on probing of the aalls and :loor ot the excavations,end the relative ease or <br /> difticulty in excavation. <br /> �.� 6����.e.Fwre�nSDa��a.ornnna.q�rt�m�•�ncnw�0e.5iLou�s __—__-_"-------._- <br /> —__--- - �IlI� I�ISam <br /> E�ruSmur.�E N�YmonCFMdier.vE GaorpeY�m�M.PE HureYWV�nmPE yiceP�eeiae�i <br /> H <br /> CM�rm�n o�Ine Bwra 6enia Viu VrouEenl Nte PraLUlnl V¢e Vrt6i0em <br /> Pns�Ceni <br /> , � , I <br />