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Specification No . : RGS0024-87 <br /> Part II - SPECIFIC CONDITIONS <br /> Section 10 - Earthwork <br /> 10 . 6 . 2 . 1 Earth excavation includes removal and disposal of <br /> pavements and other obstructions visible on ground <br /> surface , underground structures and utilities , <br /> material of any classification indicated in data on <br /> subsurface conditions , and other materials encountered <br /> that are not classified as rock excavation or <br /> unauthorized excavation. <br /> 10 . 6 . 2 . 2 Unauthorized excavation consists of removal of <br /> materials beyond indicated subgrade elevations or <br /> dimensions without specific direction of Project Soils <br /> Engineer . Unauthorized excavation , as well as <br /> remedial work directed by Soils Engineer , shall be at <br /> Contractor ' s expense . Under footings , foundation <br /> bases , or retaining walls , fill unauthorized <br /> excavation by extending indicated bottom elevation of <br /> footing or base to excavation bottom, without altering <br /> required top elevation . Lean concrete fill may be <br /> used to bring elevations to proper position , when <br /> acceptable to Soils Engineer . Elsewhere , backfill and <br /> compact unauthorized excavations as specified for <br /> authorized excavations of same classification , unless <br /> otherwise directed by Soils Engineer . <br /> 10 . 6 . 2 . 3 Additional Excavation : When excavation has reached <br /> required subgrade elevations , notify P . G . & E . and <br /> soils Engineer who will make an inspection of <br /> conditions . If unsuitable bearing materials are <br /> encountered at required subgrade elevations , carry <br /> excavations deeper and replace excavated material as <br /> directed by P . G . & E . Removal of unsuitable material <br /> and its replacement as directed will be paid on basis <br /> on contract conditions relative to changes in work. <br /> 10 . 6 . 2 . 4 Cat ability of Excavations :. Slope sides of excavations <br /> to comply with local codes and ordinances having <br /> jurisdiction . Shore and space where sloping is not <br /> possible because of space restrictions or stability of <br /> material excavated . Contractor to obtain any required <br /> CAL-OSHA permits for excavations . Maintain sides and <br /> slopes of excavations in safe condition until <br /> completion of backfilling . <br /> 10 . 6 . 2 . 5 Shoring and Bracing : Provide materials for shoring <br /> and bracing , such as sheet piling , uprights , <br /> stringers , and cross -braces in good serviceable <br /> X-3 <br />