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. _� . <br /> JN 92276 <br /> Sierra Construction Services, Inc. pege 2 <br /> July 1 . 1992 <br /> the site. Much of the area surrounding these buildings Mas <br /> covered with asphalt and conerete pavement. Several ereas of <br /> crushed rock parking or storage were observed on the eastern <br /> portion of the property. Gravelly sand was visible at the <br /> 4round surface on the western 100 to 200 feet of the site, <br /> �mmedietely adjacent tu the eurlington Northern right-of-way. <br /> � We understand that e significa�t amount of fill has been <br /> placed on the western portion of the property by Burlington <br /> Northern. This fill resulted from an off-site excavation for <br /> � a railroad tunnel . <br /> The ground surface across the property generaliy slopes gently <br /> downward to the southwest. Based on the provided Topographic <br /> Survey: it appears that the total chenge �n ground surface <br /> elevation between the northeast and southwest portions of the <br /> property , is approximately 10 feet. The topog raphy in the <br /> surrounding vicinity generally consists of gentle to maderate, <br /> west-facing slopes . The area east of Broadway, which is <br /> located about B00 feet west of the site, generally slopes down <br /> tov+ard the Snohomish River . <br /> With the exception of the Burlington Northern property, the <br /> parcels surrounding the site are primarily developed with <br /> ` industrial or commercial structures . ! <br /> c��B�URFAG� � <br /> The subsurface conditions were explored with nine test borings <br /> et the aaproximate locations shown on the Site Exploretion <br /> Plen , Plate 2. The field exploration program Nes besed upon <br /> the proposed construction, site topography the scoceeSof <br /> subsurface conditions revealed during drilling, <br /> work outlined in our proposal , end time and udget <br /> ' constraints . • <br /> The borings were drilled on June 17 and lfi, 1992, using a 'i <br /> ' truck-mounted hollov+semplesu9v+erertaken~atd S�footPeintervals <br /> Peerson Drilling • <br /> using a stendard penetration sampler. This 2-inch outside <br /> diameter sptit spoon sampler is driven intu the soil Nith a <br /> 140-pound hammer falli�g 30 inches . The number of blows <br /> required co advance the sempler a given distae technical <br /> indication of the soil density or consistency. A 9 <br /> engineer from our staff observed the drilling process , logged <br /> the test borings , end obtained representative samples of the <br /> soils enccuntered . The Test eoring Logs are attached as Plates <br /> 3 through li . • <br /> GEOTECH CONSULTANTS , INC. <br /> � <br /> i <br />