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BMP C121: Mulching <br />Purpose Thc purposc of mulching soils is to pmvidc immediate tcmporary <br />protection from erosion. Mulch also enhances pl�nt rstnblishm.ent by <br />wnscrving moisture, holding fertilizer, sced, and tapsoil in place, nnd <br />modcrating soil tcmperaturcs. Thcrc is an cnormous varicty of mulches <br />that can be used. Only Ihe most common types a:c discussed in this <br />section. <br />Condi�ions ojUsc <br />Dcsign aud <br />hrs(allatinrr <br />Specifrculinns <br />Afaimm�ancc <br />As a tcmporary co�•cr mcasurc, mulch should bc uscd: <br />• On disturbed areas that rrquire cover measures for less than :,0 days. <br />• As a cover for seed during the �cet season and during the hot summer <br />monUis. <br />• During the �sct scason on slopcs stccper th�m ?H:I V with morc than 10 <br />fect of vcnical rclicf. <br />• Mulch may bc applicd at any timc of thc ycar and must be refreshed <br />periodically. <br />For mulch matcrials, application rates, and speci6catinrs, see Table aJ. <br />Notc: Thicknesses may be increased for dislurbed arcas in or ncar <br />sensiti��e arcas or other areas highly susceptihle to erosion. <br />Mulch used ���ithin the ordinap� high-��ater mark of surface «�aters should <br />be sclecied to minimize putential flot:ition of org�nic matter. Composted <br />organic materials have higher spccific gravitics (drnsities) than stra��•, <br />wood. or chippcd matcrial. <br />• The thickness of the co��cr must be mainc�ined. <br />Standard.c Any areas that experi�nce crosion shall be remulched and/or protcctcd <br />• with a net ur blankct. If the erosion problem is dr.�innge rel:ue�.i, Uien <br />thc prob!em shall he fi>,ed and thc er �ded area remulched. <br />4•20 Volume ll — ConsWcfion Sformwater Pollulion Prevention February 2005 <br />