Bid Package 08 North Well Field - Garney Construction

Colorado River Municipal Water District
Raw Water Supply Well Sites
Ward County North Well Field
3.8 TRENCH BACKFILL
A. Material as defined by applicable reference for installation for type of pipe used.
B. Traveled Areas:
1. Compact to 90% ASTM D-698.
2. Top 12 inches below finish grade, 95% ASTM D-698.
C. Untraveled Areas:
1. Compacted to at least undisturbed natural density.
2. Not less than 90% ASTM D-698.
D. Water-settled backfill; use only where permitted by Engineer.
1. Where permitted, apply to obtain effective settlement with a minimum of water.
2. Do not permit trench to overflow.
3. Do not settle by water puddling until after trench has been backfilled to ground
surface.
4. Introduce water above the pipe embedment, through a long pipe nozzle, so
disturbance of granular embedment or compacted material is held to an absolute
minimum.
5. Add backfill material to compensate for settlement below surface grade and
settled during puddling operations.
E. Upper 12 inches of trench shall contain no particles larger than 6 inches in any
dimension.
F. Surface Finish:
1. For placement of paving or gravel surfacing, subgrade where applicable.
2. Match existing and surrounding contours.
3. Graded finished appearance.
3.9 FIELD QUALITY CONTROL
A. One proctor and gradation for each backfill material.
B. One field density for each 500 linear feet of trench per lift.
C. Maximum lift thickness: 12 inches compacted thickness.
END OF SECTION
May 18, 2012
Trenching, Backfilling, and Compaction
Revision 0 31 23 33 - 6