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• 5.02.01 FOUNDATION PREPARATION
<br />The COA Monitor shall observe and document the foundation preparation including:
<br />- stripping and excavation activities to ensure that CONTRACTOR places the
<br />material in the appropriate stockpile (Structural Fill, Select Structural Fill,
<br />Underdrain Fill, Leak collection and Detection Fill, Underdrain Pipe Backfill, Soil
<br />Liner Fill, Drain Cover Fill), if stockpiling is necessary;
<br />- monitoring stockpiling activities to verify location of stockpile, material type,
<br />and dressing;
<br />- observation of the excavations for moisture seeps, weak foundation soil,
<br />elevation, and proper drainage;
<br />- monitoring subgrade preparation and confirming that the surface of the
<br />subgrade is free of soft, organic, and otherwise deleterious materials (debris,
<br />branches, vegetation, mud, ice, or frozen materials) and that soil and rock
<br />surfaces that contain joints or fractures are adequately filled in accordance with
<br />the SPECIFICATIONS;
<br />- construction of access roads, drainage control features and erosion control
<br />features to verify accordance with the DRAWINGS and SPECIFICATIONS;
<br />- structural fill placement including soil type, clod or particle size, loose lift
<br />thickness, moisture conditioning process, type of compaction equipment and
<br />• methods used to attain compaction of the subgrade foundation, number of
<br />passes, uniformity of compaction coverage, in-place moisture content and dry
<br />density in accordance with the SPECIFICATIONS;
<br />5.03.02 PLACEMENT OF MATERIALS
<br />During placement of Structural Fill, Select Structural Fill, Underdrain Fill, Leak Collection and
<br />Detection Fill, Underdrain Pipe Backfill, Soil Liner Fill, and Drain Cover Fill, the COA Monitor
<br />shall observe and document preparation and placement of these materials including:
<br />- verification of fill types for intended use;
<br />- monitor and document material placement, including soil type, clod and particle
<br />size, loose lift thickness, moisture conditioning process, compaction equipment
<br />and methods used to attain compaction, number of passes, uniformity of
<br />compaction coverage, compacted lift thickness, bonding of lifts and in-place
<br />moisture content and dry density is in accordance with the SPECIFICATIONS;
<br />- observation of the mixing of tailings and rock fill to ensure that proper
<br />percentages of each are controlled by CONTRACTOR and that the materials are
<br />mixed together to create a homogenous composite Structural Fill;
<br />- Soil Liner Fill surface to verify that the surface has been proof-rolled,
<br />compacted, or handworked so as to be in a condition (free of ruts, desiccation
<br />cracks, abrupt grade changes, sharp stones or objects, soft areas) suitable for
<br />geomembrane installation;
<br />•
<br />February 18, 1994 Section 01400.1
<br />01400.1-7 Earthworks CQA Plan
<br />Revision 0
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