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August 1�.2UIId <br />�9r..lim'I homas <br />Rch'¢tic�c Lols 3? ,inJ 31 <br />L�l'•A .lub No. 4�108R <br />P�igc 17 <br />Rmiuff uvcr Imper� ionz tiurG�ccx <br />titorm runuff o��cr impcn�iuus swiacc, such as ruul:v ,md Jrivc��;iy.p,i��cmcnL should hc collccicd <br />by undcrgruwiJ Jruin linc s��stcros connccicJ tu downspouls and by catch hasins insl,iUrJ in <br />drivcwa�s. Slurm�v:ucr thus cullccled shoulJ bc IighllincJ lo dischargr intu :i storm sc�ccr ar :i <br />suitablc sinn»�ea�cr dispus:il I��cilily. Std7icicnt numbcrs uf clr.mouls should bc proviJcd lo thc <br />un�IrrgrounJ drain linc spslcnts �il slra�cgic luc:�lion lu ,dlo�� li�r periudir.d clr.ming of Ihc drain <br />lincs. <br />13uildin�; I�nntin� Ih•ains <br />A suhdrain shuuld hc insi�illyd. ais rcyuircd, aruund Ihc perimclrr li�otings ofcncli huilding. 'Ihc <br />subdrains should cuntiisl ol':i 4-incli-minimum-di;�mcicr, perliiratcd. rigid. PV('. drain pipc. I�iid <br />a Ic�� inchcs hclo�v thc houom i,f prrimclrr liiolings. 'I'lir Ircnchcs anJ Ihc Jruin lincs shuulJ <br />h:nc a sullicicnt graJicnt tu �cncr:Uc Ilo�v by gravily. 'I'hc drain lincs shuuld br rmhcJdcd in <br />�+;ishc�l gra��cl complrlcl�� �ar;ip�nJ in non-wovcn liltcr I:ihric I�� ��ilhiii :ihuul 12 inchcs af linish <br />gradc. tiuf�icirnl nunihcrs uf cicanouts should hc pruvidcd lu Ihc unJcrground drain linc systcnts <br />al slr:itrgic luc.diun tu allo�a fi�r periodir.il ciconing of Ihc dr�iin lincs. 'I hc remaining Ircnchrs <br />m;i� hr backlillcd ��ilh un-silc impervious suils. N'alcr collecicd hy thc perimcicr liwling <br />suhdr.�ins sliould hc ti�htlinc�l, scp;ualch- li�om Ihc ruuf and stulacc slorm��alrr driin s�slcros, lo <br />�lixh;ugr inlu a sl�,rm sr�crr ur ,� suilahlr �lurm�c.drr dispusal lacilily. <br />RItiK 1�:�',U.li,1'I'IUN ti'I'A'I'I�;�11�.N'I' <br />l hr silc is undcrlain nt rrl;ui��cl)' shnllo�e dcpth by dcnsc ta ��rry-Jcnsc lispernncc Sand soils. <br />I hcsc suils arr of high lu vcr�-high shcar sUcnglh in unJistwbcd nali��c slalu. II is our judgmcnl <br />Ihat �,rncidrd Ihc rccummrndutiuns in Iliis rc��ui1 arc fulh implrmcntcd uuriu� c�mstrucliun anJ <br />allrr Ihc cuntplcliun ul� Ihc �lccclupmcnl, lhc :irca� tlislunc�J hy cunstructiun �cill hr slahilizcJ <br />;inil rrm.iin sl.ihlc ,in�l �cill nul iucrrisc thc ��nlcnti;d Ihr suil ntuvcnunL In otu ���iiniun. �hc risk <br />�,iu & AtiSOCIA�res, iNc. � <br />`� <br />� <br />