2018-12-26_REVISION - M2008078 (31)

Home Browse Search

a. A record of SB backfill material quantities, properties, and mix adjustments made during construction. Location of sample and number of molded specimens for laboratory testing shall be noted. 6. Supplement Fines Testing—Results of supplemental fines tests performed on borrow sources samples and/or supplemental fines staged along trench. 7. Quality Control Data a. A record of quality control samples,tests and test results. 1.5 JOB SITE CONDITIONS A. The Contractor shall comply with all safety requirements and procedures. B. The Contractor shall perform all work with qualified personnel under the continuous supervision of the slurry trench specialist. C. The Contractor shall exercise extreme care to protect and prevent damage or disruption to existing utilities. D. The Contractor is responsible to contact all utility owners, including overhead electrical, in the vicinity of the work to coordinate utility locates, de-energize or shielding power lines, and observing the crossing of buries utilities; and protecting all existing utilities from damage. 1.6 PRODUCT DELIVERY,HANDLING,AND STORAGE 1. The Contractor shall deliver all materials to the site in undamaged, unopened containers bearing the manufacturer's original label. 2. The Contractor shall deliver for use only fresh materials to the site. 3. The Contractor shall store and handle materials in accordance with the manufacturer's recommendations. PART 2 - MATERIALS AND EQUIPMENT 2.1 BENTONITE SLURRY A. Bentonite slurry shall consist of a stable colloidal suspension of bentonite in water and shall be controlled in accordance with the most current API Recommended Practice 13B-1, Table 1, and the following requirements: 1. At the time of introduction of the slurry into the trench,the slurry shall be a mixture of not less than 5%bentonite in water. Additional bentonite or admixtures may be required depending on the hardness and temperature of the water and the quality of the bentonite. The slurry shall have a minimum apparent viscosity of 40 seconds reading through a Marsh Funnel Viscometer, a pH between 6 and 8 units and a minimum density of 65 pcf, (1.04 gm/cc). 2. The slurry mixture in the trench shall have a unit weight not less than 65 pcf(1.04 gm/cc), not greater than 85 pcf(1.36/gm/cc)or 15 pcf less than the backfill unit weight, or as approved by the Engineer. The sand content shall not be greater than 20%. The sand content shall be lowered by replacing the in trench slurry with fresh slurry or a desander may be used to lower the sand content. 2.2 BENTONITE A. Bentonite used in preparing slurry shall be pulverized(powder or granular)premium grade sodium- cation montmorillonite and shall meet the most current API Standard 13A, Section 4. The yield of the bentonite shall be 90 barrels per ton. 31 66 17-4 Prowers Aggregate Operators, LLC West Farm Pit Phase 2 Slurry Wall Soil-Bentonite Slurry Walls