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GEOMATRIX <br /> Each material is described in the following text according to its: (a) potential source. (b) uses, <br /> (c)typical specification, (d) compaction requirements, and (e) special handling/processing <br /> requirements (if applicable). <br /> The relative com action re uirements discussed below are <br /> P q based on the maximum d1y densis <br /> and optimum moisture content of the subject material as determined by ASTM Method D1557. <br /> When the relative density is discussed in the text, it is based on ASTM Methods D4253 and <br /> D4254. <br /> Crushed Rock- Crushed rock should be an imported material that consists of durable rock <br /> P and <br /> gravel that is free of deleterious material and free from slaking or decomposition under the <br /> action of alternate wetting and drying. This material may be used in constructing pads beneath <br /> the pump station and subsurface drainage trenches, if they are required, or may be placed on the <br /> bottoms of trenches excavated in unstable ground. If used in the construction of drainage <br /> trenches, this material should be surrounded by a suitable filter fabric selected to prevent the <br /> migration of fines into the gravel. Crushed rock should meet the following requirements. <br /> C Standard Sieve Size Percentage Passing <br /> 1 inch 100 <br /> 3/4 inch 90-100 <br /> No. 4 0-10 <br /> No. 200 0-2 <br /> These materials should have a durability index of not less than 40. If there is a concern that <br /> fines from the subgrade of a building pad could mitigate to the voids of the crushed rock, the <br /> crushed rock can be laced on a suitable eotextile fabric. <br /> P g i <br /> Crushed rock used for building pads should be moistened thoroughly and compacted to a <br /> relative density of at least 75% using approved plate- or roller-type vibratory compaction <br /> equipment. <br /> Permeable Material - Permeable material should be an imported material that consists of <br /> durable crushed rock or gravel and sand that is free from slaking and decompositionn under the <br /> i� action of alternate wetting and drying. Permeable material may be used to construct the <br /> building pads or for foundation drains, wall drains, and/or subsurface trench drains. 4 <br /> I:(Project15000s153131LE WIS-MAN.DOC <br /> 8 <br /> i <br />