DIVISION 1 - GENERAL REQUIREMENTS - IDEAS-EC

c. Slurry Mix1) Concrete mix with each cubic yard containing one sack of Portland Cement,12 gallons of water, 2,600 pounds of 3/8-inch rock, and 800 pounds of sand.2) Contractor design mix using native aggregates. Contractor mustdemonstrate a minimum compressive strength of 4000 psf. Slurry designshall be subject to the approval of the Contracting Officer.d. Native Backfill1) Material excavated from the trench.2) Free of rocks larger than 3 inches at greatest dimension, roots, sod, organicmatter, debris, frozen material, and other deleterious matter.D. Pavement1. Temporary Pavementa. Shall conform to Class “D2” crushed aggregate per SS 203-6 with SC-800 liquidasphalt per SS 203-2.2. Permanent Pavementa. Asphalt concrete shall be Type B, ½-inch maximum grading conforming to Section39, “Asphalt Concrete,” of the CALTRANS Standard Specifications with an MC800 liquid asphalt binder, or PBA 6b.E. Tack Coat1. Shall conform to SS-1h emulsified asphalt.F. All imported materials shall be certified weed and seed free.PART 3 - EXECUTION3.01 EXCAVATION FOR APPURTENANCESA. Excavate for appurtenant piping structures to provide at least 12 IN (minimum) clear distancebetween outer surface and embankment.3.02 TRENCH EXCAVATIONA. Excavate trenches by open cut method to depth necessary to accommodate work.B. Open trench outside buildings, units, and structures shall be no more than the distance between twomanholes, structures, units, or 600 lineal FT, whichever is less. Trenching limitations may be fieldadjusted by Contracting Officer as weather conditions dictate.C. Do not open greater length of trench than can be effectively utilized under existing conditions.Schedule work and order materials so that trenches are not left open for a longer period than isreasonably necessary. Any trench or portion of trench, which is opened and remains idle for twocalendar days, or longer, as determined by the Contracting Officer, may be directed to be immediatelyrefilled, without completion of work, at no additional cost to the Government. Said trench may not bereopened until Contracting Officer is satisfied that work associated with trench will be prosecutedwith dispatch.02320 - 304/08 UTILITY TRENCHING AND BACKFILLING