Exhibit B Attachment 2024_RevegetationSpecs_Updated.pdf

City of Westminster Revegetation Specifications

Reseeding for Open Space & Native Areas

A. SEED TYPES

Upland/Terrestrial Seed Mix

Upland Grass Species List Species Pascopyrum smithii (Western wheatgrass) Bouteloua gracilis (Blue grama) Bouteloua dactyloides (Buffalograss) Sporobolus airoides (Alkalai sacaton) Erymus trachycaulus (Slender wheatgrass) Koeleria macrantha (Prairie junegrass) Panicum virgatum (Switchgrass) Schizachyrium scoparium (Little bluestem) Hesperostipa comata (Needle and thread grass) Sporobolus cryptandrus (Sand dropseed) Nassella viridula (Green needle grass) Andropogon gerardii (Big bluestem)

*Can use any combination of these species at recommended rates. Availability will impact which species can be used.

Upland Forb Species List

Gallardia aristata (blanketflower) Coreopsis tinctoria (Plains coreopsis) Ratibida columnifera (Prairie coneflower) Penstemon angustifolia (broadbeard penstemon) Cleome serrulata (Rocky Mountain Beeplant) Penstemon strictus (Rocky Mountain Penstemon) Erysimum capitatum (Western wallflower) Linum lewisii (Prairie Blue flax) Rudbeckia hirta (Black-eyed susan) Monarda fitsulosa (Wild bergamot) Verbena stricta (Hoary vervain) Achiella millefolium (Western yarrow) Asclepias speciosa (showy milkweed) Echinacea purpurea (Purple coneflower) Dalea purpurea (purple prairie clover) Heterotheca villosa (hairy golden aster)

*Can use any combination of these species at recommended rates. Availability will impact which species can be used.

Wetland Seed Mix

Wetland Graminoid Species List

Beckmania syzigachne (American sloughgrass) Carex nebrascensis (Nebraska sedge) Distichils spicata (Inland saltgrass) Eleocharis palustris (Creeping spikerush) Elymus lanceolatus (Thickspike wheatgrass) Koeleria macrantha (Prairie junegrass) Juncus torreyi (Torrey’s rush) Panicum virgatum (Switchgrass) Pascopyrum smithii (Western wheatgrass) Poa palustris (Fowl bluegrass) Spartina pectinata (Prairie cordgrass) Sporabolus airoides (Alkalai sacaton)

Wetland Forb Species List Asclepia tuberosa (Butterfly milkweed) Asclepias speciosa (showy milkweed) Coreopsis tinctoria (plains coreopsis) Iris missouriensis (rocky mountain iris) Helianthus nutalli (Nuttall’s sunflower) Monarda fitsulosa (wild bergmont) Tradescantia occidentalis (prairie spiderwort)

Riparian Seed Mix (does not include shrub or tree species)

Riparian Graminoid Species List

Carex nebrascensis (Nebraska sedge) Distichils spicata (Inland saltgrass) Elymus canadensis (Canada wildrye) Elymus lanceolatus (Thickspike wheatgrass) Elymus trachucaulus (Slender wheatgrass) Juncus torreyi (Torrey’s rush) Panicum virgatum (Switchgrass) Pascopyrum smithii (Western wheatgrass) Poa palustris (Fowl bluegrass) Spartina pectinata (Prairie cordgrass) Sporabolus airoides (Alkalai sacaton)

Riparian Forb Species List Asclepia tuberosa (Butterfly milkweed) Asclepias speciosa (showy milkweed) Coreopsis tinctoria (plains coreopsis) Gallardia aristata (blanket flower) Helianthus nutalli (Nuttall’s sunflower) Monarda fitsulosa (wild bergmont) Solidago canadensis (goldenrod)

B. SEEDING RATE

Seeding shall be done at a rate of 25-50 PLS lb/ac.

C. PURITY

Grass seed specified will conform with all current state regulations regarding weed seed content and will meet the required pure live seed content as adjusted for batch purity and germination.

D. SOIL AMENDMENTS

Soil test should determine what amendments are required (if any). The City of Westminster shall approve soil amendment application prior to seeding. Nitrogen fertilizer should not be used unless soil test determines gross deficiency in nitrogen. Low level or slow release organic fertilizer is preferred (compost, biosolids, mushroom compost, animal waste, biosol, NutraFix).

E. MULCH

Mulch is required to conserve moisture, prevent crusting, reduce runoff and erosion and help establish a plant cover.

The need for mulch will be at the sole discretion of the City of Westminster. Mulching material shall be applied immediately after seeding. One of the mulching methods listed below will be acceptable:

• Areas under one acre: application of hydro-mulch (wood fibers in a water slurry) -- minimum rate of 2,000 lbs/acre. A tackifier shall be included in the hydro-mulch.

• Areas over one acre: grain straw shall be used at an application rate of 4,000 lbs/acre of air-dried material. At least 50-percent of the mulch by weight shall be 10 inches or more in length. Mulch shall be anchored immediately after distributing with a mulch crimper.

F. GRADING / SEEDBED PREPARATION

In general, graded areas will match the undisturbed surface elevations ensuring positive drainage. In areas of pipeline installation grades over the pipe itself may be slightly elevated where the project engineer may believe that settling is likely to occur. Upon establishment of approved grades, the soil surface shall be graded by means of ripping and cultipacking, or rototilling (only if necessary) to a depth of 8 inches to the approved elevations. If using a soil amendment, the organic matter shall be evenly spread over the entire surface at the rate specified, and then mixed thoroughly into the soil surface by means of a rototiller, soil mixer or similar equipment. Seedbed preparation shall be approved by the City of Westminster prior to the installation of seed or soil amendments.

G. SEEDING

Dry land seeding, sometimes referred to as “native” seeding, shall be accomplished with mechanical power-drawn drills which have depth bands set to maintain a planting depth between ¼ inch and ½ inch and shall be set to space the rows not more than 2 inches apart. In addition, the drill will be equipped with multiple seed boxes from which large smooth, small smooth, and appendaged (i.e. fluffy) seed can be metered evenly. Seed that is extremely small shall be sowed from a separate hopper adjusted to the proper rate of application. When requested by the contractor and approved by the City, seeding may be accomplished by means of approved broadcast or hydraulic-type seeders.

Seed shall not be drilled or sown during windy weather or when the ground is frozen or otherwise untillable.

All seed sown by broadcast-type seeders shall be “raked in” or otherwise covered with soil to a depth of at least 1/4-inch. Hand method of broadcasting seed will be permitted only on small areas not accessible to machine methods. If inspections indicate that strips wider than the specified space between the rows planted have been left or other areas skipped, the City may require immediate resowing of seed in such areas at the developer’s expense.

During all seeding operations, proper functioning of the seed drill will be demonstrated to the satisfaction of the City of Westminster upon request.

H. WEED MANAGEMENT

In the three years following seeding, seeded areas will be monitored to assess the presence of serious weeds that require eradication or other treatment. Manual control will be undertaken where species and circumstances allow.

However, chemical treatment may become necessary in some areas, to be determined by the City of Westminster.

I. ACCEPTANCE

Acceptance of the seeding shall be per the Terms and Conditions of this License Agreement. A minimum of 80% coverage of target species will be required, with no visible bare spots.