2012-03-07_PERMIT FILE - C2010088 (24)

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UNIQk') 'PACIFIC In cut sections where the material to be excavated is solid rock the Industry shall excavate twelve inches (12 ") below the Subgrade elevations as shown on the Drawings. The Industry shall replace such excavated twelve inches (12 ") of solid rock with embankment material approved by the Engineer, adjust the moisture content of this material and compact to a dense and unyielding condition and to a minimum of 95% (Modified Proctor) of maximum density. After the required clearing and grubbing, the foundations for embankments shall be prepared by scarifying the top six inch (6 ") layer of existing ground, adjusting moisture content, and compacting such scarified material to a dense and unyielding condition and to a minimum of 95% (Modified Proctor) of maximum density. After the foundation areas are scarified and recompacted the Engineer shall observe and approve (by proof rolling or other methods) these foundation areas before any embankment material is placed. Embankments and backfills of less than three foot (3') of fill shall be compacted to a dense and unyielding condition and to a minimum of 95% (Modified Proctor) of maximum density. When embankments and backfills are composed of more than three foot (3') of fill, the materials within three feet (3') of the established subgrade (top of fill) elevation shall be compacted to a dense and unyielding condition and to a minimum of 95% (Modified Proctor) of maximum density. Material below said three foot (3') from subgrade (top of fill) elevation shall be compacted to not less than 90% of maximum density. Unless otherwise directed by the Engineer, the moisture content of the soil at the time of compaction shall be at the optimum moisture content or within minus four percentage points (4 %) of the optimum moisture content as stated in ASTM D 1557 Modified and as determined by tests taken by the Engineer in accordance with ASTM standards. Each embankment lift shall be tested for compaction compliance before the next lift is placed. All compaction shall be determined using ASTM D 1556 for field tests and ASTM D 1557 for moisture and density. Copies of all soils tests and observations shall be provided to the Engineer, the Engineer will not approve placing subballast before these tests are received. 8.16 FINISH GRADING - The Roadbed shall be finished to the lines and grades shown on the Drawings and as staked. The Industry shall protect finished roadbeds from damage, from all causes, until accepted by the UP. Blue Tops (finished grade stakes) are required at one hundred foot (100') intervals and are to be set at the shoulders and at the centerline. If the distance between the shoulder stake and the centerline stake is over one hundred foot (100'), an intermediate Blue Top will be required. 8.17 TOPSOIL - A minimum of six inches (6 ") of topsoil consisting of friable, fertile soil of loamy character, containing an amount of organic matter normal to the region, capable of sustaining healthy plant life, and reasonably free from subsoil, roots, heavy or stiff clay, stones larger than two inches (2 ") in greatest dimension, noxious weeds, sticks, brush, litter and other deleterious matter will be placed on all excavation and embankment slopes and any disturbed soils that will not support plant 29