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2009-06-08_REVISION - M1997032 (19)
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2009-06-08_REVISION - M1997032 (19)
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Last modified
6/15/2021 2:20:26 PM
Creation date
6/10/2009 8:57:30 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1997032
IBM Index Class Name
REVISION
Doc Date
6/8/2009
Doc Name
EPP (AM-01) Appendix A,B,C,D & E of Attachment D (part 6)
From
Denison Mines
To
DRMS
Type & Sequence
AM1
Email Name
RCO
Media Type
D
Archive
No
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Seedbed Preparation <br />Areas to be revegetated should have soil conditions capable of supporting vegetation. Overlot <br />grading will oftentimes bring to the surface subsoils that have low nutrient value, little organic <br />matter content, few soil microorganisms, rooting restrictions, and conditions less conducive to <br />infiltration of precipitation. Under certain conditions, soil amendments and treatments may be <br />necessary to provide an adequate growth medium to sustain vegetation. <br />Whenever possible, topsoil should be salvaged for respreading on areas to be revegetated. The <br />depth of soil stripping is determined by the depth of available topsoil. Areas near drainageways <br />may have a considerable depth of topsoil, whereas lesser amounts may be available on the <br />crowns of hills and flat slopes. Topsoil should be viewed as an important resource to be utilized <br />for vegetation establishment, primarily due to its water-holding capacity. Native topsoil located on <br />a construction site also have good soil structure, organic matter content, biological activity, and <br />nutrient supply that supports vegetation. <br />The rooting zone of most semi-arid grasslands evident in the Denver metropolitan area is 6 to 18 <br />inches. At a minimum, the upper six (6) inches of topsoil can be stripped and stockpiled, and <br />respread to a thicker depth on surfaces not planned for buildings or impervious areas. If the <br />surface is compacted, ripping of subsoils prior to topsoiling is recommended. Scarification will <br />assist in placement of a stable topsoil layer on steeper slopes, and allow percolation and root <br />penetration to greater depth. <br />Where topsoil is not available or utilized, subsoils can be treated to provide a plant-growth <br />medium. Organic matter can be added to improve nutrient levels necessary for plant growth. <br />Other treatments, such as liming, can be used to adjust soil conditions as necessary with <br />amendments. Soil testing is recommended to determine appropriate amendments required. <br />A suitable seedbed will enhance the success of revegetation efforts. The surface should be rough <br />and the seedbed should be firm, but neither too loose nor compacted. The upper layer of soil <br />should be in a condition suitable for seeding at the proper depth and conducive to plant growth. <br />Temporary Revegetation <br />Temporary revegetation is required on all disturbed areas having a period of exposure prior to <br />final stabilization of one year or longer. All temporary seeding shall be protected with mulch. <br />To provide temporary vegetative cover on disturbed areas which will not be paved, built upon, or <br />fully landscaped within 12 months but will be completed within 24 months, plant an annual grass <br />appropriate for the time of planting and mulch the planted areas. The annual grasses generally <br />suitable for the Denver metropolitan area are listed in Table C-2. These are to be considered only <br />as a general recommendation whenever specific design guidance for a particular site is not <br />available. <br />Permanent Revegetation <br />To provide vegetative cover on disturbed areas not paved or built upon for a period of 2 years or <br />longer, or for an indeterminate length of time, a perennial grass or grass mix should be planted. <br />Each site will have different characteristics, and a landscape professional should be contacted to <br />determine the most suitable species or seed mix for a specific site. In lieu of a specific <br />recommendation and for planning purposes, one of the perennial grass mixes appropriate for site <br />conditions listed in Table C-3 can be used. The pure live seed (PLS) rates of application <br />recommended in these tables are considered to be absolute minimum rates for seed applied <br />using proper drill-seeding equipment. All permanent seeding shall be protected with mulch. See <br />Table C-4 for appropriate seeding dates. <br />
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