Laserfiche WebLink
Grnrrchnicnl Enginccrir�A Rcpori 6 Oc�ohrr 2J; 2005 <br />('ommm�itl' Hrafd� Ccnter, F.rcreft, 11 A Projec! q1003J 96 <br />J.6 Drninacc <br />Srrrfare <br />Final c�tcrior graJes should pramotc 1}cc and positi��c drainagc away from building. V1'mcr <br />must not pond or collcct adjacent to foundations or �ti•ithin thc imr.icdiatc building arca. Wc <br />rccommcnd providing a minimum drainagc gradicnt of 3% for a minimum distance o!' 10 <br />('ect from thc building perimctcr, except in pa��cd locations. In pavcd locntions, a minimum <br />gradicnt of I"/o should bc pro��idcd unlcss pro�•isions arc includcd for collection anJ <br />disposal of surfacc walcr adjacent to thc structurc. <br />Substirjnce <br />\1'c recommcnd installing perimctcr ('oundation drains. A h�pical rccommcnJed drain detail <br />is sho�ti�i on Pigurc 4. 'I�hc foundation drains and roof Jo���nspouts should bc tightlincd <br />scp:iratcly to an approved dischargc facility. Subsurfncc drains must bc laid �+�ith a gradicnt <br />suflicicnt to promotc positivc (low to a contn�ilcd point of approved dischargc. <br />a.� u��i�u�s <br />l tility pipcs should hc bcddcd and backfillcd in accordancc �vith Amcrican Public �l'orks <br />Assc,ciation (APN'A) spccifications. I�or site ulilitie•s located within the City of G��erctt <br />ri�ht-of-��ays, hcdding and back�ill should bc complctcd in accordancc ���ith City of <br />li�crctt spccifications. 'fhc trcnch backfill should bc placed and compacted ns structural <br />IiIL as dcscrihcd in thc Sitc Prcp�ration and Grading scction. <br />\i'hcre utilitics occur bcln�e unimpro��ed arcas, thc dcgrce of contpaction can bc rcduced to <br />:i minimum of 90 percen: of thc soil's maximimi density as detemiincd b�� the refcrenccd <br />i�til'�1 stand.ud. As notcd, soils c�cav.ucd on-sitc ��ill gcn�rall� hc suitablc fnr usc ns <br />h;ick�ill matcrial if soil's tnoislurr can hc properk contmllcd. <br />4.R Parcmcnts <br />I'a�cmcnt suhgradcs shuuld hc �rcp,imd as dcscrihcd in thc Sitc Prcparation and Grading <br />scction of this rcport and as Jiscusscd hclo�c. Rcgardlcss of thc rclati��c compaction <br />;ichic��cd, thc subgradr must bc finn mid relati��cl}� unpiclding bcforc pa��ing. Thc subgradc <br />tihuuld bc proof rollcd ���ith hca���� constniction cquipment t�� �crif� this condition. <br />\1'ith the pa��ement suh�r�de nreparcd as described aho�e. �ce recomrnend that the general <br />��arking arca bc ra�ed �cith tkxible pa�cm�nt surface. 'fhe fiillo�+�ing pa��emenl sections <br />;�rc rccommcndcd: <br />. I�or heucy truek traffic areas: 3 inches of asphalt eonerete (AC) o�er G inches of <br />crushcd rock hasc (('R131: and <br />� 1� ur �;cncral parkin� urr.�s: Z inches ot'AC ���cr 4 inchcs of CRD. <br />I hc asphalt r:i� ing muicriuls uscd should contimn to thc \Vashington Statc Dcpartment of <br />l r.ins��nnalion 1\\'til)(11 1 s��rcitic.uions t�ir Class B asphalt concrctc and CRB surfacing. <br />I'hc Riley Group, Inc. <br />� <br />