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PART 2- MATERIALS AND EQUIPMENT <br /> 2.1 LOW PERMEABILITY FILL <br /> A. Low permeability fill shall consist of material free from roots,organic matter,debris,and other <br /> deleterious material. Peat and organic clay are not acceptable as low permeability fill.Low permeability <br /> fill shall have at least 55 percent fines(pass the No.200 sieve)and shall have a plasticity index of at <br /> least 10 when tested in accordance with ASTM D 4318. Individual particles up to six inches in diameter <br /> are acceptable.When compacted,low permeability fill shall result in a fill without visible voids between <br /> particles,and all particles larger thanY4 inches shall be completely surrounded by a continuous soil <br /> matrix. It is anticipated that the low permeability fill will be borrowed from the Davis Farm Fines <br /> Stockpile. <br /> B. The percentage of gravel(material retained on the No.4 sieve)shall not exceed 10%. <br /> 2.2 PERMANENT EMBANKMENT FILL <br /> A. Embankment fill shall consist of any on-site non-organic overburden or sand and gravel material free <br /> from roots,organic matter,debris,and other deleterious material needed for the shell of the liner and <br /> permanent reservoir slopes.Peat and organic clay are not acceptable as embankment fill. Individual <br /> particles up to six inches in diameter are acceptable.When compacted,embankment fill shall result in a <br /> fill without visible voids between particles,and all particles larger than 1/4 inch shall be completely <br /> surrounded by a continuous soil matrix. <br /> 2.3 GRANULAR BACKFILL <br /> A. Rockfill shall consist of 1.5"angular gravel. <br /> 2.4 COMPACTION EQUIPMENT <br /> A. Provide compaction,watering,and aerating equipment of suitable type to achieve the specified <br /> compaction moisture content and relative compaction.A pad foot roller or equivalent which kneads the <br /> soil during compaction is required for low permeability and permanent embankment fill compaction. <br /> PART 3- EXECUTION <br /> 3.1 SUBGRADE PREPARATION <br /> 1. Prior to fill placement,subgrade shall be grubbed and stripped of all grass,vegetation,topsoil, <br /> rubbish,or other unsuitable materials. <br /> 2. Where stable soils are encountered at subgrade level,material shall be compacted as outlined in <br /> this specification prior to low permeability and permanent embankment fill placement. <br /> 3. Prior to placement of low permeability and permanent embankment fill,subgrade shall be scarified <br /> to a depth of 2-inches with a disc or similar equipment and moisture conditioned to facilitate <br /> bonding with the new fill. <br /> 4. Surfaces to receive fill shall not have ponded water,snow or ice,nor be desiccated or cracked. <br /> 5. Prior to fill placement,cut slopes shall be"benched"to prevent the development of a potential <br /> sliding surface. <br /> Loloff Slurry Wall 3123 00-2 <br />