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3877.3 SAMPLING AND TESTING <br />The Contractor shall submit to the Engineer a list of prospective fi sources sr topsoil borrow at least 1 month prior to time of <br />use to allow adequate time for inspecting, testing, and approving definition of particle size. Texture shall be determined <br />Texture of the topsoil shall be classified according to the Engineering <br />by the method described in AASHTO T 88. <br />The current standard testing procedure of the University of Minnesota, Soil Science Department, Soils Testing Laboratory ctible <br />shall be used for determining pH, percent of organic matter, ex p hosphorous, exchangeable potassium, and soluble <br />salts. <br />Premium Topsoi Borrow <br />w <br />be screened and pulverized and meet the requirements of Table 3877 - 3: <br />TABLE 3877 -3 <br />PREMIUM TOPSOIL BORROW PEQ.U]REMENT in <br />M i mum <br />95% <br />10% <br />25% <br />25% <br />5% . <br />6.0 <br />Premium topsoil C <br />b orro <br />w for use as a plant growing medium in critical areas and top dressing erosion stabilization mats shall <br />-322- <br />Material Passing 2.00 mm ( #10) Sieve <br />Clay <br />Silt <br />Sand & Gravel <br />Organic Matter <br />pH <br />Soluble Salts <br />a_ x murn <br />• <br />25% <br />60% <br />60% <br />15% <br />7.1 <br />• 0.15 siemens /m <br />(1.5 mmho /cm) <br />