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Slurry in the trench shall be tested at least once per shift when excavation of the trench is advance <br /> and/or backfill is placed. Samples shall be obtained from near the bottom of the trench near the point <br /> of trenching. These tests shall include(see Table 1): <br /> - Unit weight of the slurry by Mud Balance(API Standard 13B-1) <br /> - Filtration loss of the slurry(refer to API Standard 1313-1) <br /> - Viscosity of the slurry(refer to API Standard 13B-1) <br /> - Sand Content of the slurry(refer to API 1313-1) <br /> D. Backfill mixture <br /> A complete series of backfill mixture test shall be conducted at least twice per shift when backfill is <br /> mixed and/or placed into the trench. Gradation shall be conducted at least once per shift. The tests <br /> shall include(see Table 1): <br /> - Slump(refer to ASTM C-143) <br /> - Gradation(refer to ASTM D-422) <br /> - Moisture content(refer to ASTM D-2216) <br /> - Unit Weight(refer to API 13B-1) <br /> - Coefficient of permeability(refer to ASTM D-5084)(once every 1,500 LF) <br /> 3.15 DOCUMENTATION <br /> Top of key elevations will be compared to working platform elevations and depth of cut elevations to provide <br /> additional information on actual key depths. <br /> Results of all tests performed in accordance with the specifications will be recorded on forms acceptable to the <br /> Contractor,Engineer and the Owner,and signed by the Contractor and a Quality Control Representative. <br /> These forms will be available to the Owner at all times for inspection. Copies of all forms will be submitted <br /> daily to the Owner for reference. <br /> 3.16 COLD WEATHER CONSTRUCTION REQUIREMENTS <br /> No frozen backfill or slurry shall be placed in the soil-bentonite slurry wall trench. All ice forming on the <br /> surface of the slurry trench shall be removed prior to the start of each shift. No frozen or frost bearing soil- <br /> bentonite backfill material shall be placed into the trench. When freezing temperatures exist,the Contractor <br /> will conduct visual inspections of the slurry in the trench and the soil-bentonite backfill. The inspection may <br /> include measurement of the temperature,if necessary,to evaluate the potential for frozen material. The <br /> frequency of these inspections will be a minimum of once per day. Typically the inspection will occur early in <br /> the day prior to the placement of any soil-bentonite backfill. Additional inspections may be required if <br /> conditions warrant and/or change. <br /> Slurry wall construction work scheduled and/or performed between November 1 st and March 31 st will require <br /> the submittal,by the Contractor,and approval,by the Engineer,of a work plan detailing cold weather <br /> construction procedures. <br /> END OF SECTION <br /> Section 02168-Page 6 of 6 February 2016 <br />