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01i23i89 1244 ~ 303 490 1063 CO~RADO LIEN CO <br />UNI'l'EU S1'A1'C5 DCPARTMF.N'1' OP AGRICULTURE Tcchnicnl Guide <br />Soil Conservation Service Section 1V <br />Colorado All Field Offices <br />July 1981 <br />S1'ANllARDS AND SPLCIFICA'l'70NS <br />CRITICAL, A1tCA PLANTING (ac.) <br />(342) <br />Standard <br />Planning considerations <br />De[initign <br />Y1.3nti:tg vegetatintt, such as trees, <br />shrubs, vines, ~,rasses nr farbs, <br />on Itigl:ly erodible or critically <br />croding nre.as (does not include tree <br />planting mainly far wood products). <br />r~l~ oae <br />To stnbiJ 1ze tl:c soil, reduce d:tmnge <br />from sediment and runoff to duwnstroam <br />arses, and improve wl.ld.life Itebltat <br />and visual resources. <br />Condltians where practice applies <br />On Itigl:ly ernclible or critically era-` <br />dlhlc or critlcal.l.y oroding areas. <br />Tl:crc art+ne usua]].y cannot he st:tbil- <br />ized by nrdiuary conservation treut- <br />mrnt and managemmu and, if left <br />untreated, can cause severe erosion <br />or sediment damage. Examples of <br />npplicablc arias are dams, dikes, <br />minx. spoil, lcvec:a, r.oadsidus, cute, <br />fills, sutf.ace-mined areas, attd de- <br />nuded ur gu711cd areas whets vet;eta- <br />tiott is difficult to estubli.slt by <br />usual planting methods. <br />Critical area planting should be <br />applied only on sites that have the <br />cup.~biliLy of supporting vegetation. <br />Sumo critical areas are so hostile to <br />plant growth, because of c]i.mate, <br />soi:le or slope, that stabilization <br />can be ar.hieved only through etruc- <br />tur.:tl measures. <br />USIIA <br />SOIL CANSEpVAIION SEAYICE <br />FRANK RIGGLE <br />DISTRICT CONSERVA71OfJ15T <br />~ 10 <br />Other conservation practices, including <br />but not limited to diversions, land <br />smoothing, obstruction removal, surfaco <br />and subsurface drains, and underground <br />outlets, Inuy be necessary to prepare a <br />critical arnn for planting. Site pre- <br />paration accomplished thrnugit the appli- <br />ration of tlto above practices should <br />result in a sire meeting tits following <br />standards. <br />1. Land slopes should not exceed 50 <br />percent (2:1) and should be flatter. <br />where feasible and practicable. <br />2. Soi1e or soil materials must have <br />euffieinnt depth and potential <br />fertility to support the type of. <br />vegetation to he cntnbliehed. <br />3. Materials such as rocks and trash <br />that will interfere with planting <br />must be removed. <br />4. Runoff water from the site or adja- <br />cent arena must be controlled in a <br />manner that will prevent serious <br />erosion and damage co the planting. <br />Syecification;: <br />Ty~soilin <br />In tits event that the soils havs insuffi- <br />cient depth or have pltyeical eharacter- <br />istice unsuitable for develapmant of <br />ve.gelativa cover, topsoil or aoi]. material <br />Itavi.ng tits capability of supporting rite <br />planned vegetative planting shall be <br />bruugltt iu and spread over the deficient <br />atone. The material must he applied <br />uniformly ~1 a ificiant daptlt to cupport <br />the type and quality oP vegetative cover <br />planned for L'Ite site. Source of tnateri,sls <br />must be approved by rite responsible <br />teclmlciact. <br />