DIVISION 1 - GENERAL REQUIREMENTS - IDEAS-EC

SECTION 02318STRUCTURE EXCAVATION AND BACKFILLPART 1 GENERAL1 .1 DESCRIPTIONA. The work of this section consists of structure excavation and backfill.1 .2 QUALITY ASSURANCEA. All compaction testing and gradation analysis will be arranged and paid for by the Contractor.Tests shall be performed by an independent testing laboratory.B. All references to percent of maximum density will be as determined by ASTM D698-91, MethodC, at a moisture content determined to be suitable for such density. Moisture-density curves willbe prepared in a certified soils testing laboratory.C. In-Place Soil Density Testing: Procedures used by the Contractor shall be in accordance withASTM D1556-90, Density of Soil In Place By the Sand-Cone Method, or ASTM D2922-91,Density of Soil and Soil-Aggregate In Place By Nuclear Methods (Shallow Depth). Contractorshall perform at least one test on the subgrade of each tank foundation and on the subgrade of theretaining wall footing.1 .3 CLASSIFICATIONA. All excavation under this section will be considered unclassified regardless of the materialencountered.PART 2 PRODUCTS2 .1 SELECT FILLA. Fine, readily compactible soil or granular material, free from frozen lumps, stones larger than 2inches, highly plastic clay, and organic or other objectionable material. Excavated materialmeeting this requirement may be used with approval.2 .2 AGGREGATE BASE MATERIALA. Class 2, 3/4-inch maximum size, aggregate base as defined by Section 26 of the StandardSpecifications issued by the State of California Department of Transportation (CALTRANS).PART 3 EXECUTION3 .1 GENERALA. Provide required bracing, shoring, sheeting, and pumping.B. Stake and identify the extent of all earthwork operations prior to starting work. Excavation andearthwork operations shall remain within the limits shown on the drawings. If required laybackfor excavation exceeds limits shown on drawings, Contractor shall notify the Contracting Officerbefore proceeding with excavation.02318-1STRUCTURE EXCAVATION AND BACKFILL