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This tcchniquc works ���ith standard hydromulch (1,500 pounds per acrc <br />minimutn) and F3FM/MBFMs (3,400 pounds per acre minimum). <br />• Areas to bc pcnnancntly landscapcd shall pro��idc a hcalthy topsoii <br />that reduces the need for ferlilir.ers, improves oeerall ropsoil quality, <br />providcs for bcttcr vegctal hcalth and vimlity, improvcs hydrologic <br />charactcristics, and r�Juccs thc nccd for irrigation. This can be <br />accomplishcd in a numbcr of ways: <br />Rcccnt rescarch has shown that thc best mcthod to improvc till soils is <br />�o amcnd thcsc soils �ti•ith compost. Thc optimunt tni�lure is <br />approximatcly �:co parts soil to onc part camposi. This cquales to �3 <br />inches of compast mixcd to a dcp[h of I 2 inchcs in till soils. Incrcasing <br />the conccntralion of compos� bcyond this Icvcl can havc ncgativc <br />effects on veceuil health, �+•hile decrcasing the :oncentntions can <br />rcduce the bencfits of amcnded soils. Plcasc note: The compost should <br />ntcct specifications for Gndc A qualitp cumpost in Gcology <br />Publication 9a-038. <br />Other soils, such as gn��el or cobble out�eash soils, may rcyuirc <br />different approaches. Organics and lines easily migrate through the <br />loose swcture of these soils. Therefore, �he importation of at Ieast 6 <br />inches of quality topsoil, undcrlain by somc rypc of filtcr fabric to <br />prevcnt thc migntion of fincs, may be more approprintc for thcsc soil�. <br />Arr�s that already h.rvc good topsoil, such as undisturbcd arcati, do no� <br />rcqwre soil amendmenu. <br />• Aieas that will be seeded only .�nd not landscaped may n�ed compost <br />or mcal-based nmlch indudcd in the hydroseed in order to establish <br />vcgctation. Nativc topsoil shoidd bc rainstalled on thc disturbcd soil <br />surfacc beCore applicaiion. <br />• Sccd that is installcd as a tcmponq� mcasurc may hc inst�dlcd by hand <br />if it will bc covcred b}� str;i��•, mulch, Of �Or501I. Sl'L'd llllll IS 1115�eIIC(I <br />as a pcm�ancnt mcasurc may bc insi;dlcd by hand on small arcas <br />(usually Icss ihan I acn) ih:il will bc covcrcd with mulch, topsoil, or <br />crosiun hl:+nkets. l'he secd mixes listed belo�t� include recommended <br />tni�cs for hoth Icmporarv and pemiancnt sccding. Thcsc mixcs, with <br />thc esception of the wedand mir, shall be applied at a r.�te cf 120 <br />pounds per acrc This nte can bc rcduced if soil amendmen:s or slow- <br />release fertilizers arc used. Local supplicrs or thc local corscrvation <br />distric� shauld be consultcd for thcir rccommcndations bccrusc thc <br />appropriate mi� depends on a ��ariety of factors, induding localion, <br />cxposurc, soil typF slope, and crpcctcd foot tra(7ic. Allcmativc sccd <br />miscs approved by thc local authoriry may bc uscd. <br />4-76 Volume ll — Conshuclion S(onnwafer Pollution Prnventron February 2005 <br />