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• o Terra Tack, a mixture of organic polymers and inorganic silicates, <br />has been applied on about 150 acres. <br />o Terra Tack and hydromulch (wood fibers) have been applied to <br />the 6 acre switchyard on the plant site. <br />o Coherex, an organic polymeric resin formulation, and magnesium <br />chloride have been applied to the valley access road from County <br />Road 215, up Davis Gulch Road and along Firebreak Road to the <br />ridgetop topsoil stockpile. The first 6 miles of access road from <br />County Road 215 received magnesium chloride treatment. The remain- <br />ing 3 miles was treated with Coherex and magnesium chloride. <br />o One acre test plots on flat terrain and on steep slopes were developed <br />on the North Valley Fill of the plant site for further tests of the <br />following dust suppressants: Terra Tack, Terra Tack plus Conwed <br />2000, Corexit, magnesium chloride, ammonium lignin <br />sulfate, Arco 2200, Coherex, and various NALCO <br />latex and polymer preparations. <br />o All dust suppressants either now in use or to be tested are in <br />general commercial use as dust suppressants and have been tested <br />and found to be non-toxic to aquatic life, wildlife, and humans <br />when used according to manufacturer's recommendations. <br />Dust suppressants not only reduce windblown dust but also help reduce <br />erosion of treated areas. Dust suppression has been apart of the Colony <br />program on the site since construction commenced, and the program described <br />• above constitutes a natural extension of that program. <br />PD 1000.102 616 <br />