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I B. Select Backfill: Materials for backfill shall be fine. readily compactible soil or soil-rock , 2 mixture selected from the excavation, or from other approved sources, and shall not contain 3 frozen lumps, stones or rock fragments larger than 4 inches, chunks of highly plastic clay, 4 organic or other objectionable material. Rock fragments over 4 inches may be reused if 5 processed down to hard fragments less than 4 inches in size. 6 7 C. Imported Select Fill: Material shall consist of silty sand free of organic matter or other 8 objectionable material, approved by the Engineer, and meeting the following requirements: s 10 Minimum 'R' Value: 45 11 Maximum Expansion Pressure•(psf) 10 12 Maximum Plasticity Index: g 13 14 • Test Method California 301 - Value at 300 psi exudation pressure. 15 16 2.02 DRAIN ROCK n 1a Material shall be clean gravel or crushed rock of one-inch (1•) maximum size, with no 19 material passing a Number four (#4) sieve. 20 '21 2.03 GEOTEXTILE FABRIC 22 23 A. Type I: Fabric shall be Mirafi 500X, or equal. 24 25 B. Type II: Fabric shall be Mirafi 140N Drainage Fabric, or equal. 26 27 r 28 PART 3: EXECUTION 29 30 3.01 CLEARING 31 32 A. Prior to the beginning of earthwork, the Contractor shall clear all roots, organic matter, 33 debris, paving, curb, vegetation, and other objectionable material except for trees and 34 shrubs designated to be saved, from the area within which excavation and grading are to 35 be conducted, or storage of excavated materials or fill is to be made. 36 37 B. All cleared material shall become the property of the Contractor and shall be disposed of 38 at a location off the site in a manner satisfactory to the Engineer at the Contractor's 39 expense. 40 ,41 3.02 STRUCTURAL EXCAVATION 42 43 A. General: All excavation for structures shall be done to the dimensions and levels indicated 44 on the drawings or specified herein. Excavation shall be made to such width outside the 45 lines of the structure to be constructed therein as may be required for proper working 46 methods, the erection of forms and the protection of the work. Care shall be taken to 47 preserve the foundation surfaces shown on the drawings in an undisturbed condition. If 48 the Contractor excavates or disturbs the foundation surfaces shown on the drawings or 49 specified herein without written authorization of the Engineer he shall replace at his 50 expense such foundations with compacted gravel foundation fill or other material approved STRUCTURE EXCAVATION AND BACKFILL 050594 02225-2