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i <br /> i <br /> Proposed Rctail Developmcnt J-1443 <br /> 112`"Strcet and Hwy.99 February 26,2004 � <br /> ( Cvetctt,Washington P8�21 <br /> \ <br /> fabric does not provide siructural strength at such shallow depths. !f the subgrade is disturbed � <br /> when wet,overexcavation may be required and backfill with import fil1. � <br /> Concrete Pavement � <br /> 1 <br /> Concrctc pavement design recommendations are based on an assumed modulus of rupture � <br /> of 600 psi and a minimum compressive strength of 4,000 psi for the concrete. <br /> Recommended Concrete Pavement Sections i <br /> Tratfic Concrete T6ickness Crushed TopBase Pit-Run Subbase ( <br /> �n, Course in. �ches <br /> Heavy I <br /> 167,900 ESAL's 6 6 0 � <br /> , <br /> � <br /> Standard p � <br /> 73,000 ESAL's 5 6 <br /> I <br /> � If the compaction standard is reduced to 90 percent of the modified Proctor maximum dry � <br /> density,we recommend that the base eo �rse thiclrness be increased by 2 inches for both standard <br /> and heavy-duty sections. �', <br /> The materials and construction procedures should be in accordance with WSDOT <br /> Standard Specifications for cuncrete pavement conshvction. I <br /> Stream Realienmcnt <br /> As a part of this project, we undcrstand that S"�amp Creek will be realigned in order to <br /> circumvent the proposcd project,as well as to daylight the creek. The geotechnical evaluation in <br /> support of this phase of the project consisted of diilling four borings(8-18 through B-21) in order <br /> to evaluate the soil and groundwater conditions. <br /> The subsurface conditions along the proposed stream route gcnerally consisted of very <br /> loose to medium dene silty sand over medium dense to very dense silty sand with gravel <br /> interpreted to be glacial till. <br /> Groundwater was generally encountered at depths of about 9 to 11 feet below existing <br /> grades although shallower groundwater may be encountercd during wet periods of the year. This <br /> was int�rpte[ed to be a perched groundwater condition due to the underlying dense glacial till <br /> soils. <br /> Based on the anticipatcd depth of the stream, it appears that the bottom of the chan:�el will <br /> � be siluated within loosc sandy soils, some of which may be impacted by petroleum product, as <br /> J-1443,022604 <br /> 1� <br />