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04-03-1996 14:01 303 447 2999 P.05 <br />Observatlorts <br />• Water Treatment Plant Filter Fines in general I~robably <br />vary with the watershed serving the treatment plant, but those <br />from the Boulder Betasso Plant provided excellent seedbed <br />material. Best growth seemed to occur where it was present as <br />a 2 to 6 inch layer over the clay subsoil. In 1995, the clay <br />subsoil performed the function of water storage very vvell. But <br />areas where the clay was on the surface (without topciressing) <br />and also areas with deeper filter fines topdressing haci <br />distinctly less development of plant cover by fall. <br />• The Soil GuardT'" bonded fiber matrix performed the task <br />of protecting the seedbed well even under conditions of <br />historic record high rainfall. Though relatively expen:~ive, its <br />use on the steep, exposed talus buttress slope seems to have <br />been a good decision to ensure the highest probability of <br />successful vegetation establishment. <br />• Extraordinarily favorable moisture conditions of spring <br />1995 caused a very high rate of germination/seedling <br />establishment that prevented weed establishment andl carried <br />the young stand through a relatively hot and dry summer. <br />