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( �� �d� ��° �.. �`'orrhern, rnc. <br /> P►oj�l No.2il�t05 <br /> 1 1 <br /> ( Materlal� Fle�bk Saetle� Ri�id Satlo� �� <br /> � Packin lat aaas I.adin nlo�Q�rat Ome Throu �s <br /> AsplWuc Conaete S:vAanj(Class H) 2 in _ . <br /> P�on1aM Cammt Conaue - 3 ia 6 ia <br /> P on1aM <br /> 1 '.4 ioeh Ceuslkd A�peple Bsx Course 6 ia 6 ia 6 ia <br /> t ?otal 1'6iekant ie fac6a t id lI id I2 ta. <br /> 1 <br /> T6e conswction specifications for paving aress should inelude Wuluagton State <br /> � Department of.Tnasportuion(WSDO'1)specifications for wdace and base courae mateciai <br /> seleaioa All base coune matuials shall be placed and mcchenically compacted to a non- <br /> yielding uata We raommead that the base course a�terial wnform to the 1991 WSDOT_ <br /> C Standard for Cnuhed Surfacing oudined in Sarion 4-^3.9(3). The granulu base course <br /> muerial aluli be mechaniuUy eompacted to at lesss 95%of the ma�dmum dry density vaiue <br /> as damnined by ASTM D-1557 tat procedures. The asphaldc co�rae s6afl meet Gass B, <br /> Lpurwant to WSDOT 1994 standard specifications, and :he rigid pavement should consiat of <br /> minimum 3000psi concrete slabs that are win mesh roinforced and doweled at the joints. <br /> Q.7 Site and Buildfn�Dralnage <br /> C The praence of silty soils at the site indicates drainage s6ould be provided for the <br /> foundation perimecer. The foundetion drainage system should consist of a minimum four(4) <br /> inch diunaer,perforated,rigid pipe placed(perforations downwazds)along the exterior base <br /> � of the foundaeon puimeter and tightlined to a stomi drain system or other suitable outlet. <br /> The pipe should be bedded on at least two(2)inches of pea gravel and bac�iled with a <br /> minimum of(12)inches of pea gravel. <br /> lIn ordv to minimize the risk of storm water backtlow into footing draias,we <br /> recommend that roof davinspouts be tightlined to a storm drain system or other suitable oudet <br /> � separately from the footing draias. T6e site should be graded so thac surface wata tunoff is <br /> directed to catch basins,whic6 aze attached W a uorm sewer drain or other suitable oirtla. <br /> � If dewatering during conswction is eeeeuary, constcuaion-dewataing procedures <br /> must include rputing of water to a witable outlet. Witltin excavation;we recummend that <br /> dewatering include routing of water to wmp areas, from whae it may be pumped to a witable <br /> � _ outlet. <br /> 7.0 CONSTRUCTION MONITORING <br /> � We recommend that we be engaged to observe grading activities during consuuctioq <br /> observa the stability of pccavations, observe the installation of dreinage eystem, and to <br /> � observe and test the placement of suuctural fill in structural arcas required for raising the <br /> gades. <br /> ' <br /> 1 9 <br /> r . <br />