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TRENCHING & BACKFILL 02 2020-4 2. Thoroughly moisten surfaces as required to prevent dust being a nuisance to the public, neighbors, and personnel performing other work on the site. 3. Use dust palliatives or reclaimed water (not potable water). F. Maintain access to adjacent areas at all times. G. Maintain and/or replace all bench marks, monuments, construction stakes and other reference points. H. Repair or restore damage to any portion of the work resulting from movement of the sides or bottom of trenches or other excavation which is attributable to the Contractor's acts or omissions, whether sides are braced or not. PART 2 - PRODUCTS 2.01 GENERAL SOIL MATERIALS A. In general, soils used for backfill shall be select material free of debris, roots, wood, scrap material, vegetation, refuse, soft unsound particles, frozen, deleterious, or objectionable materials, satisfactory to the Engineer, free of stones or lumps exceeding 3 inches in greatest dimension. 2.02 PIPE BEDDING AND INITIAL BACKFILL MATERIAL A. Pipe bedding and initial backfill up to six inches above the top of the pipe shall be Class I, Type A, ¾” maximum size gradation permeable material, conforming to Section 68-2.02F(2) of the State of California Department of Transportation Standard Specifications. B. Material shall contain at least 75% of the particles having one or more fractured faces. C. Bedding and backfill material shall be subject to the approval of the Engineer. 2.03 SELECT BACKFILL ABOVE INITIAL BACKFILL OR BEDDING A. In non-paved areas unless otherwise shown on plans, select backfill shall conform to the requirements for soil materials above, and shall be classified as (GW), (GP), (GM), (SW), (SP) or (SM) by ASTM D 2487 and meet the following: 1. Sand equivalent shall not be less than 25 when tested in accordance with ASTM D 2419, plasticity index shall not exceed 15 when tested in accordance with ASTM D 424, and not more than 25% by weight shall be finer than the No. 200 sieve. 2. On-site native material may be used as backfill if it conforms to 2.03A.1, above. B. In paved areas, except Bay Mud, select backfill shall be Class 2 aggregate base, 3/4" maximum size gradation conforming to Section 26-1.02B of the State of California Standard Specifications.