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• <br /> <br /> <br />ESCO <br />III IIIIIIIIIIIII III <br />999 <br />ESCO ASSOCIATES INC. <br />a.o.Box1877s 1077 So.C~arryvaleRd. <br />aoultler, CO 80308 Boultler, CO 80303 <br />(3031417.2999 FAX (303( 484-3231 <br />Mr. Paul Banks <br />Western Technologies Inc. <br />13949 West Colfax Avenue. No. 140 <br />Golden, CO 80401 June 29,1990 <br />Dear Mr. Banks: <br />The following constitutes a report of supplemental vegetation studies ei Dowe Flats performed <br />pursuant to our conversation of June 8, 1990. The description of mapping units here <br />accompanier a map on which the vegetation/ lend use of the specified additional areas has been <br />delineated. This description supplements that present in the previous report prepared by ESCO <br />(1987). <br />MAPPING UNITS IDENTIFIED IN DOWE FLATS SUPPLEMENTAL AREAS <br />NATURAL YEOETATION TTPES <br />0 -Dry Upland Grassland. This unit corresponds to the grassland for which a detailed species <br />list was compiled on Limestone Ridge. It represents a natural grassland variably degraded by <br />livestock grazing. Plant species conspicuous in the occurrence of the type in the northern Dowe <br />Flats area surveyed for this work include the perennial grasses Fendler ihreeawn (Arisiide <br />fendleriana), blue grams (Bouteloua arecilis), western wheatgress (Aoroovron smithii), ring <br />muhly (Muhlenberpia torrevi), the annual grasses cheaigress (Bromus tectorum) and Japanese <br />brome (Bromus iaaonicus), the perennial forbs blenkeiflower (Gaillerdia eristata), low <br />sunflower (Helienthus pumilus), blue flex (Linum lewisii), narrowleaf scurfpea (Psorelea <br />tenuifolia), Pacific osier (Aster chilensis), common bindweed (Convolvulus arvensis), yellow <br />stemless eveningprimrose (Oenothere brachycerpe), and slenderbush buckwheat (Eriogonum <br />effusum), the annual (or biennial) forbs musk thistle (Carduus nutans), yellow sweetclover <br />(Melilotusofficinalis), Patagonia Indienwheai (Planieoooaiaaonie), pennyroyal (Hedeoma <br />hirDjda), mullein (Verhescum thepsus), andallysum (Allysum minus), end the succulent <br />pricklypear cactus (Opuntia polyacenthe). <br />WW -Western Wheatgress Grassland. These areas occur on heavy soils on low slope areas in <br />the potential overburden storage area on the northern end of Dowe Flats. Along with western <br />wheatgrass (Agropvron smithii ),dominance is shared with streambenk wheaigress ( ro ron <br />dasvstachvum var. rioerium ). Other species locally conspicuous include the perennial grass <br />foxtail barley (Hordeum iubatum ),the annual grasses cheatgress, Japanese brome, the <br />perennial forbs fog fruit (Phyla cuneifolia), two-groove milkvetch (Astragalus bisulptus), <br />Short milkvetch (Astragalus shortianus), Dalmation toedflax (Lineria dalmatica), Pacific ester <br />bastard toadflax (Commandre umbelleta), end scarlet globemallow (Sphaerelcea coccinea), and <br />the annual (or biennial) forbs pennyroyal, allysum, end moth mullein (Verbascum blatieria). <br />SR -Sedge/ Rush Wei Areas. These areas, occurring in depressions end drainage bottoms, may <br />quelifiy es wetlands, depending on the abundance of wetland indicator species at particular <br />locations (as may certain locations in the Riparian Forest unit). A wetland inventory and <br />delineation is being concurrently mnducied by Aquatic end Wetland Consultants. Species present <br />include Nebraska sedge (Carex nebrascensis), broom sedge (Carex scooerie), Baltic rush <br />(Juncus arcticus ssp. balticus), interior rush (Juncus interior), foxtail barley, tall fescue <br />~ ~ .~~ .~ <br />