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Geotcchnical Lnginccring L`�a�:.ation <br /> 8310 Rim Drivc- Ryan <br /> NovemNer 8,2004 <br /> RMI Filc No. 21604 <br /> Pagc 6 <br /> Erosion Control D7ca�sures <br /> "I�hc crosion h�znrd for ihe on-sitc soils is considered slight. The erosion hnznrd will be dependent on <br /> how t,..; site is grodcd and water is nlluwed to nccumulnte. I3cst Mnnagement Prnctices(f3MPs)should be <br /> used to control erosion Measures tnken may include diverting surface wntei awny from the stripped area <br /> but not ovr�• Ihe slape. Silt fences ur stra�� balcs should be ercctcd to prevent tnuddy ��'atc ' Gont Ienving <br /> thc sitc. <br /> Tempor��r�� und Perm:�nent Slupes <br /> 'I cmporary cut-slopc stability is a function ot man} factors, such as lhc type and consistcncy of soils. <br /> dcpth of thc cut, surcharge loads �djacent to thc cscavation, lengih of'ime a cut remnins open, ..nd thc <br /> presencc of surface or grounJ �anter. It is di('ficult undcr these ��ariable conditions to estimate a stnble. <br /> iemporan�, cut-slope angle. Thercfore, it should be the responsibility of the conlractor to maintain snfe <br /> slopc configurations since the contractor i. r��ntinuously at thc job sitc, able to obscrve the nature anJ <br /> condition of thc cut slopes, und nblc tu ivanitur thc subsurfacc matcriuls and ground watcr conditions <br /> cncauntercd. <br /> Por pl�mning purpo;es. ��e rcconunend thtll temporary cu's in the slope soils be no steeper than I <br /> llorizontal ro I Vertical (IH: IV). If ground ��ater wcre encountered, �ve would e�pect that flatter <br /> ' inclinations would bc neccssar�'. <br /> This information is pr�•�ided solclv for tlic benctit of tl�e o�vncr and othcr design cunsultants and <br /> should not be cunstrucd to impl� th;�t R�7( Associutes, Ltd. a�ssnm��s responsibility far job site <br /> � safet��. 1'he on-sitc contr»ctor is thc entil}�solcl�• respo�isible for joh site sefet��. <br /> \Ve recommend Ihat cu1 slopes be protected from crosion. �lcasures takem m�y include covcring cut <br /> slopes with plastic shccting and di�crting surfacc runoft�a��ay from the top of cut slopes. �Ve do not <br /> recummend vertical slopes for cuts decper than 4 feet, if c orker access is necessary. We recommend ihut <br /> cut slopc hcights :md inclinntions confunn tu \1'ISHeVOS1iA seanda�ds. <br /> I�innl slopc inclinatiuns :or stru�tural flll and cut� in the native soils should be no stceper than 2FI: IV. <br /> Lichtly compacted filis or cummon fills sl�oi�ld be no steepe�than 3H: IV. Common lills are defined as <br /> till meterials, potentialh ��ith �ome urganics, thiu are "tractrolled" into place. They ��ould not meet the <br /> RMI Associates, Ltd. <br />