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I• July 31, 1984 Page 2 1. Suitable embankment and core trench materials include material that is free of debris, roots, organic matter, frozen material and stones with any dimension greater than one half of the loose layer thickness (12 inches). This fill material must have a fine grain texture where 30 percent passes the No. 200 sieve size. 2. Materials for the embankment shall be spread by approved means in horizontal layers not more than twelve (12) inches thick. Portions of the fill not accessible to vibratory roller or loaded scrapers shall be placed in four (4) inch layers. Lifts in the embankment shall be compacted to 90 percent of Modified Proctor Density [see laboratory results (Attachment 1) and daily reports). The central portion of the embankment shall be crowned with grades not to exceed 2 percent. 3. The embankment for sediment pond No. 1 stands eight • (8) feet above the top of its core trench. The width at this top elevation is twelve (12) feet grading to a basal width of approximately 60 feet on 3:1 slopes. The embankment for sediment pond No. 2 stands nine (9) feet above the top of its core trench. The width at this top elevation is twelve (12) feet grading to a basal width of approximately 67 feet on 3:1 slopes. The complete dam specification will be submitted when Fox Consultants, Inc. receives survey notes. 4. Field density and moisture shall be controlled in the field with an approved nuclear device by a certified operator. One test shall be made for each 2000 square yards or less and a minimum of one test for each compacted layer. Material that does not satisfy the density requirements shall be removed, reworked and retested. 5. A 36 inch I.D., 16 gauge galvanized riser CMP shall be installed. four (4) rows of 2-inch wide by 6-inch long slots shall be constructed on one foot center to center spacing beginning down from the top of the riser pipe. In addition, a rebar screen . consisting of No. 4 bars on 2 inch center to center spacing shall be constructed inside the top of the - 270 - (Rev. 5/86)