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perimcicr drains slwuld hc slopcd to drain hy praeity, il' practicablc. �o a suiuibic dischar�c point. <br /> prcfcrahly:i slomi dr;iin. lYc rrcummcnd�hc dc:utou�s bc co�crcd, and bc placcd in ilush mountcd utility <br /> ho�cs. \Ua�cr cullccicd in ronf do�cnspout lincs must nut bc routcd lo ihc tiiolinc drain lincs. <br /> SLAB ON GRADE FLOOR <br /> Su6grade Preparetion <br /> �Vc rccommcnd concrctc slabs-on-eradc bc ronsinicicd i•n a graccl Iaycr to pro�idc wiifomi suppoi7 :md <br /> drainagc. and lu act as a c:ipilla�y hrr..k. \Vc also rccommm�d that al Icasl 12 inchcs of gra�cl hurro�c <br /> subbasc hc placcd hdu�� Ihc Ilour slabs :md capillary brc.�k graccl. 11'c cspcci ihat slab-on-gradc iloors <br /> can bc suppuncd on ihc nativc mcdium stil7'�o �'c�y sliff sih and cla�� pro�idcd that ihc capillary brr,�k <br /> suhhasc I:q�n ;ur ronsuiicicd. Prior �a placing ilic graccl laycr and subhasc. Ihc suh�r.idc should hc <br /> proof rollcd ;�s dcscribcd prc�inusly in ihc "Lmyli�+ork" scction of this rcpon. If ncccss:iry. ihc ,uhpndc <br /> should hc rcrompacicd io a linn mid wiyiclding condition. A gcoicxtilc scpar,Uor, such as Mirafi 50(1.\. <br /> ma�� hc nccdrd hclo�v thc suhbasc I:rvcr and localizcd addi�ional o��crc�ca�;Uion of sofi arcas may bc <br /> ncrdcJ durinc consiniction. <br /> Design Parameters <br /> Yhc gr:��cl laycr bclu�� sl;ibs-on-gradc should consisl of 6 inchcs ofcican crushcd craecl «ith a masimum <br /> parlidc sirc of I'/ inchcs and nrglicihlc sand or silt uccrlying Ihc 12 inchcs subb�uc Inycr. Por slabs <br /> dcsignrd :is ;i bcam on an clas�ic linind:uiun, a mudulus ol'sub�radc rcaclion ol'S0 pci ma�� bc uscd �i�r <br /> suhgradc soils prcp;n'cd as rccommcndcd ahuvc. <br /> If�calcr vapur migratiun Ihruu�h Ihc slabs is ohjcc�ion:iblc, ihc �ra��l should hc covcicd ��'idt a h�a��y <br /> plaslir shc:i. such as 10-mil pinzlic shccting. io act as a rapor retardcr. This �cill bc dcsirablc �clicrc �hc <br /> ;labs �vill hc surlaccd wi16 lilc ur ��ill hc carpcicd. It mny also bc pnidcnt to apply a sc:dcr to tlic slah to <br /> (urihcr rctard ihc migraiion ol'mois�urc Ihrough Ihc iluor. Thc cuntraciur shuulJ bc tnadc responsiblc Ibr <br /> m;iin�aining Ihr intcgrily ufihc �;ipor harricr during cunsvuclion. <br /> Underslab Drainage <br /> Ground�e:ucr in burinp B-6 ��as mensurcd a� a dcpih uf:ibout 3 Iccl hclo�c Ihc csisiing ground swfacc. <br /> Gruund�caicr cuulJ arcumulalc hclu�� Ihr slah-on-gradc iloor dcpcnding on ihc IinishcJ iloor cic�ation. <br /> '1'u hclp mitigalc pu�rnlial huild-up ul crouncl�cuicn c�la�c �hc slabs. �ec rccommcnd tha� �lic concrcic <br /> slahs-on•graJc li�r thc gymnasium ;md ih� �ccithi roum hc prucidcd �cith undcr drainagc lu culiccl and <br /> di.chnrpc ��ulcminl gruund�c;ucr I'rutn hclu�� 1hr slah. l�his r.m bc accomplishcd by installing a �1-inch <br /> di;muicr. hca�y-�c;ill prrli�r:ucd cull,c�or pipc in a shallu�� ircnrh placcJ bclu�� Ihc r.ipillary brr,ik gravcl <br /> I;q'cr. Thc Irrnch should ntcasurc ahoul I lirot �cidr hy I.i tic� dccp and should bo backtillcd �eilh cic:m <br /> i;��inch pcn graccl. \1'r rcrunnncnd iusialling a singlc undcr drain cullcctor pipc in aii cas�-�ccsl <br /> dirrclian hclmc �hc slahs ;dong appruxim;ucly gridlincs 6' :md gridlinc I$ anJ connccl cach cnd ul tlic <br /> drain pipc into thc perinulrr liro�ing drain pipc ur inlo Ihc csisting subsurfacc drain pipc. Thc condi�ion <br /> ul' thc rsislin� suh,url;icc drain pipr should hc ccalualcd lo makc surc i� is nol damagc and is Gcc of <br /> dcbris ;md funcliuning pruperly. II'conncctcd to thc t�io�ing drain sysicm. ihc invcr� o(thc undcr drain <br /> �ll�ll' til1011lll Ill`I11LIll'I'III:IiI Illl` 111\l'll O��l�ll IUOIIIIL lIi':1111 �ll�ll' \\'Ill`Il'llll\'conncct. <br /> I he rollccior pipc >hould hr �lupcd io dr;iin and discharec inlo �hc sturm �catcr collcction syslcm to <br /> com c�� Ihc ��:ucr ol7silr. l'hc pipr should also incoqior;nc cleanuuls. il'possihlc. Thc cicanou�s could bc <br /> c�icndcJ tl�rouch thr limnd;ui�m ��alis to hc acccssihlc tium ihc omsidc. or could hc placcd in <br /> Ilu�h-mounlcd acccs.busc, r,ut into �hc Iloor slahs. <br /> l-n,� \,�.�s:n.nn-.n�� PnR�' �= GEOENGINEfIIS� <br /> �� .4,h-I".:rnia <br /> �� <br />