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<br />C Premium Topsoil Borrow <br /> <br />Premium topsoil borrow for use as a plant growing medium in critical areas and top dressing erosion stabilization mats shall <br />. be screened and pulverized and meet the requirements of Table 3877~3: <br /> <br />Material Passing 2.00 mm (#10) Sieve <br />Clay <br />Silt <br />Sand & Gravel <br />Organic: Matter <br />pH <br />Soluble Salts <br /> <br />TABLE 3877-3 <br />PREMIUM TOPSOIL BORROW REQUiREMENT <br /> <br />Minimum <br />95% <br />10% <br />25% <br />25% <br />5%. <br />6.0 <br /> <br />Maximum <br /> <br />25% <br />60% <br />60% <br />15% <br />7.1 <br />.0.15siemens/m <br />(1.5 mmho/em) <br /> <br />3877.3 SAMPLING AND TESTING <br /> <br />The Contractor shall submit to the Engineer a list of prospective sources for topsoil borrow at least 1 month prior to time of <br />use to allow adequate time for irispecting,testing, and approving the sources. <br /> <br />Texture of the topsoil shall be classified according to the Engineering definition of particle size. Texture shall be determined <br />by the method described m: AASHTO T 88. <br /> <br />The current standard testing procedure of the University of Minnesota, Soil Science Department, Soils Testing Laboratory <br />shall be used for determining pH, percent of organic matter, extractible phosphorous, exchangeable potassium, and soluble <br />salts. <br /> <br />58 <br />