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14 LANDAU <br /> ASSOCIATES <br /> EXHIBIT A <br /> Scope of Work <br /> Chaplain Creek Culverts Replacement at Diversion Dam Road <br /> Project Background <br /> The project site is approximately 1 mile south of Lake Chaplain at the intersection of Lake Chaplain <br /> Road and a gated logging road leading to the City of Everett's water filtration plant.The existing <br /> culvert to be replaced consists of four 24-inch diameter steel culverts with soil cover underlying a <br /> gravel surfaced logging road.The primary purpose of the culvert is to allow water passage of Chaplain <br /> Creek.To provide for improved fish passage,and replace the deteriorated existing pipes,the culvert <br /> will be replaced with an approximate 40-foot long,single span,prefabricated steel girder bridge with <br /> corrugated steel deck pan overlain with gravel surfacing. <br /> Based on published geologic information, the site is likely underlain by Advance Outwash deposits <br /> consisting of gravel and sand with varying amounts of silt, Fluvial Outwash deposits consisting of <br /> boulders,cobbles,gravel and sand,or Advance Glaciolacustrine deposits consisting primarily of silt with <br /> varying amounts of clay and sand. <br /> Proposed Scope of Services <br /> The purpose of our services will be to evaluate and characterize soil conditions at the site,and develop <br /> geotechnical conclusions and recommendations to support bridge foundation design and construction <br /> for the project.Our scope of services will consist of the following: <br /> • Observe the excavation of 2 borings located on each side of the existing culvert.Each boring <br /> will be advanced to a depth of about 25 feet(ft) below ground surface(bgs).Geotechnical <br /> samples will be collected at frequent intervals.The borings will be advanced using a truck <br /> mounted hollow-stem auger drill rig supplied and operated by a drilling firm working under <br /> subcontract to LAI.Groundwater levels, if encountered in the borings at the time of drilling, <br /> will be recorded on the field log.At completion of the drilling,the borings will be backfilled <br /> and decommissioned in accordance with the requirements in Chapter 173-160 of the <br /> Washington Administrative Code(WAC).To avoid buried utilities,we will contact the local <br /> one-call utility locating service at least 2 full business days before the start of the field work. <br /> A geotechnical engineer or geologist from LAI will monitor the explorations,obtain soil <br /> samples from the borings,and prepare field logs of conditions encountered in the <br /> explorations.Samples obtained from the borings will be taken to our laboratory for further <br /> examination and testing. Laboratory testing will consist of two(2) moisture content <br /> determinations and four(4) mechanical sieve analysis and/or fines content determinations on <br /> select soil samples obtained from the borings.Soil samples obtained from the explorations <br /> 130 2"d Avenue South • Edmonds,Washington 98020 • (425)778-0907 • www.landauinc.com <br />