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<br /> OTHER STUDIES
<br /> In addition to Ihe explorations completed as paR of this s[udy, the logs of explorations completed as part
<br /> of previous studics on Smith Island w�rc reviewed. Specifcally, surf'ace and subsurface information
<br /> � presented in our rcport, "Geotechnical Gngincering Report, Proposed Composting Facility, Smith Island
<br /> Site, Everett, �Vashingtod',dated DecemUcr 2003, was reviewed as part of this swdy.
<br /> FlELD EXPLORATION AND LABORATORY TESTING
<br /> FIELD EXPLORATION
<br /> Subsurface eonditions were evaluated by a field cxploration proeram that consieted oY t�d�-incin�, unc
<br /> geotechnical soil boring, excavating six test pits using a tracked cxcavator, and perfonning tcn conc
<br /> penetration tests (CPT). The soil boring (designated a-1) was advanced to a depth of approximatel}
<br /> 99'h feet below the existing ground surface. The test pits(designated TP-1 through TP-6) were excavatcd
<br /> to d�pths betwecn approximately 1G to 20 fect belo�. the SRound surface, which was the limit of the
<br /> excavation equipment. The CPTs (designated CPT-1 dirough CPT-10) �vere advanced to depths of either
<br /> 100 fect below the existing ground surface or ZO leet below the existing bRouud surface. The shallo���r
<br /> test pit and CPT explorations were located across the site in planned facility improvement areas to
<br /> evaluate near surface compressible soil conditions. The iocatians of the explorations were sun�cyed b}
<br /> David Lvans & Associatcs, and thcir locations are shown on Figurc 2. Appcndix r� includes de[ails oFthc
<br /> subsurfacc exploration program and a log of the boring (�igur� A-2), logs of the tcst pits (Pigurcs A-3
<br /> through A-8), and logs of the CPTs (Pigures A-9 Qirough A-13).
<br /> LABORATORY TESTING
<br /> Soil samples obtained from the esplorations werc uansporled to GcoGngincers' laboratory in Redmond,
<br /> Washingron anci examined to confirm or modify field classitications, as ���cll as to evaluate index and
<br /> enginecring properties of the soil. Represcntative samples wcre sclected for laboratory testing consisting
<br /> of moiswre content, dry density, Atterberg limits, percent passing the US No. 200 sieve, and
<br /> consolida:ion tests. The tcsts wcre performcd in general accordancc with test methods oC the :lmcrican
<br /> Society for Testing and Materials (ASTbt) or o[her applicable procedures. Appcndi� 13 includcs a bricf
<br /> discussion of the I�borarory tests and test results.
<br /> SITE CONDITIONS
<br /> GENERAL DESCRIPTION
<br /> The app�oximatcly 20-acre sitc is lacatcd in th� Snohomish Ri��r delt� area south of Stearnboat Slough
<br /> ncar thc north cnd of Smith Island. Smith Island is part of an extensive alhn'ial fsn that sits north af thc
<br /> main channel formcd Uy Union Slough on the east and Steamboat Sloueh to Ihe ncrth. Past land use
<br /> activities ii:cludc diking and draining arcas f'or cropland and pasturc.
<br /> SURFACE CONDITIONS
<br /> T'he site is relatively Ievel with site gradcs ranging from approximately Elevation � to G feet. A higher
<br /> area up to Elevation l2 fec[ is located in the north�vest corner of the site. A nonhwest-southeast trending
<br /> raised embankment for a former access road is located in the westcm middle portion oF[he site. The top
<br /> of the embankment is at about Glev�tion 8 feet. r\ drainage ditch is located along the west side of the old
<br /> access road embankmcnt. i3urlineton Northem Railroad right-of-way is located along the east propert��
<br /> boundary. The sitc is !�enerally vcgetatcii �rith tall grasses. A small sumd of d�ci 3uous trees exists ncar
<br /> thc wWh�cat ;ura o�the sitc. 131;�ckbcrri�s an� other brush are prescnt alone thc drainage di[ch adjaccni
<br /> Fi(c No. �Y987-OOJ-00 PilSC 3 GEOENGINEEH�
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