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"��'r fl� •c0 �, q� p : D .i��.����.T. �ci�. . .ir..�ir �p-r ��'. <br /> 1.01.9 [jll Conetruclinn ei J Rriu�[�y��y: 7here am two mclhod�of canstructing� fil��gair.st which�o build <br /> �tockcry. The fin4 Nhich typiul.r�ppliu to mcY.e�ia o(los itan eigLt tcci in hei�ht, is to overboild �nd lheu <br /> cut baek �he fill, The�ewnd, whiih �pplia io dl mckcrie+ in exceu of eiQh� feet m hei�ht, It m cocatruct Ne <br /> fill using a geogrid or geotcchnicel 'abric rcinforcemcnt. <br /> Overbuildinp t6e Gll tllowr for Ntithciory compaulon of ihe fill mau uut beyond lhc loution o(Ihe fill ftce to <br /> be Proteued. Owrbuilding al�o allows the earthwork conlraGO� 10 use luper �nd mom eRettive comp■nion <br /> equipment in hu wm�aetive effarts, thereby typiully echievina a more eompetent fill meu. Cutting b�ek into <br /> the well mmp�aed fill also qyiraily results in conetruction of�competem ncv vertiul fill fere�goinu u�hich io <br /> build lhe rakery. <br /> For ihe biQher rockeriu the use o!a swgrid or peotethnical f�b�ic m 6elp reinfora the fJ1 r�sulu in wwtruction <br /> ot ■ mnre atabie fill Gm cgeinst which io wnstrua the rakcry. 7'hif form of co�utroction leads to a louger <br /> luting �nd mare tteblo rockcrv pnd hslps redum thc ruk of dgnifiunt long�erm m�ioten�na. <br /> This luter Corm ot conitruclion rOquircs e dceign by the grotechniul enpneer tor uch�pecific rau. Tkc vertiul <br /> tp►un;o[the reiutoramont,the ipecific type of rcinforcement,and the dicance to whicE it must eztc�d beck inio <br /> �he N�, md Ihe emouni of IippinQ mntt be Letermined on a rakery�hyrakery basu. <br /> 7.OI,1D Rrckerv Ke.+.n: The fin[ etep in i0cke�y con�truUion, ther generAl sim deariug �nd/or genVd <br /> exuntioq u to wertruu c keyw�y in whiah �o Duild the rakery. The keyway ihdl wmproe a challow trench <br /> ot beeweea twelve(12) �nd eighleen(18) inchec in depth,cxtcndiuQ tor the fuU len�h at t6e takory,�nd inciined <br /> beek slightly lowetds Ihe tacc heing pratected. It i� rypicnlly dug at wide u the roc�try(including the width of <br /> Iht rock filtcr leyerj. <br /> If�hc condition of tho protected fea is of conttrn,thc ke}way should lx wnstruued in sutione of mmaguble <br /> ' len�th, thu i� of�leogth Ihet c►n be oontduoied !n nne �hiR or onc dayt work. <br /> The wmpetenry af the keyw�y mb¢ride to iupport the rakery theii be verified by probina uilh a �mell diemeter <br /> ' ueel rod. 7'he rod shall lu�x � dumeter ot between thrcveiQke and onefid( inch, end �hdl be pu�hed inm <br /> the tubgrede in � imooth unsided manner under the 6ndy weighl o(t6c prober only. <br /> Penetntion of up to �ix in�kn, wilh wme dillmulry, thall indica�e a 'competeaP keyu�a)'tu6gredc unless uhtr <br /> AUors in t6e geotechninl ea�ineer'� opinion chall indlute otbtrwita Penetretion in acess ot su inchet, or of <br /> Ikitt depth wilh use, ahall indiutc e 'soft' wbgrade end one that could require trutmrne Sott uent of the <br /> sub��de can be 'firmed np•by tamping a le��cr uf mane querry spella imo the subgteAc. <br /> 7.Ol.11 �f���ed Rnckerv Dralnou�; On wmpletion o(le�way exavation, e shnllow ditch or trcne6,epprnri• <br /> m�tely twelvo (71) inche+ wide enc deep, should lx dug eloag the rar cdac ot the keywsy. A minimum loun <br /> inch diameter pertonted or eloaed ADS drsin pipe, or rquiv�icnt �pproved by in engincca �hould be phced in <br /> this ahdlow vench�nd ihould be bedded on end surmunded by e frcc•drainin�omshed rock. Burial of the dnin <br /> pipe ie Ihis chdlow Vench pro�idea protection to tht pipe �nd helps prcrcnt rt from beittQ inedvertenlly authed <br /> by pieces of�hc rockery rock. Tl:is drain pipe shou!C be installed wi�h aufficien� gradient to initiaro Oow, +od <br /> should be conneerod to a potili�x enA permeneni dir.cherge. <br /> Poshive aud pum�nent dninege�hould be considcred to menn an existing,or to be icutalled,smrm drain Syttc�, <br /> a iu'alq ditch or otha form of sudace water Oow wlicnion system, a detenlion or retcmion pond, or other <br /> et�ble nalive sim feuurc or prc�iausly instilled collettion system. <br /> JAld2 F.akerv 7'Alckness; The individual rockery thickness, inuuding Ihc tock fller Iryet, 6h0uld bt et IeG1t <br /> 40 percent of Iht tockCry hoighL Unlefs olhcrwise spe[ified in wTitin4 by Ihe rockery 'designer' the indi�4dwi <br /> rocki should be �tnnQed in � sinyle coune w�hich, w•hcn mcnmred �o include Ihe filter leyer, is equal to Ihe <br /> required rockerr thickness. <br /> 4/4/89 Pa@e 4 <br />