COMPLIANCE INFO_FINAL WMU FU-23 DESIGN RPT & CONCURRENCE LTRS

Home Browse Search

Forward Landfill WMU FU-23 02300 15 EARTHWORK 3. The minimum final thickness of the clay liner shall be as shown on the Construction Drawings. 4. Moisture conditioning shall be uniform throughout each lift. Use tilling, discing, or other options to thoroughly mix soil and water. If underlying lifts are allowed to dry out, they shall be reconditioned and recompacted prior to placement of new liner material. 5. The clay liner shall be compacted in-place to a minimum dry density of 93 percent relative compaction at a water content of 3 to 5 percent greater than the optimum water content as measured by ASTM D1557. 6. Scarify surface of each lift to a depth of 2 inches prior to placing the subsequent lift of Clay Liner Material. 7. Clay Liner Material shall not be placed at a high water content so that excessive cracking occurs when the layer dries out. 8. Clay liner soil shall be sufficiently blended and compacted to provide a homogeneous clay liner sufficient to meet required permeability. 9. The top surface of the final lift shall be bladed smooth and recompacted with a non-vibratory steel drum roller to produce a smooth top surface free from tire or roller marks, holes, and depressions more than 1/2 inch deep. The top surface shall conform to the lines and grades shown on the Construction Drawings. 10. At the end of each construction day's activities, completed lifts or sections of compacted clay liner shall be sealed by rolling with a rubber tired, or smooth drum, rollers and sprinkled with water as needed. 11. Upon completion of the clay liner, the GEOSYNTHETICS CONTRACTOR shall place geomembrane lining as specified in Section 02778, HIGH DENSITY POLYETHYLENE (HDPE) GEOMEMBRANE. The OWNER shall survey the termination edges of the HDPE Geomembrane at a minimum 50-foot interval. 12. Prepare the top surface of the clay liner for placement of the geomembrane liner by removing rock, debris, cracks, or other structural irregularities that could puncture or cause undue stress on the geomembrane liner. The top surface will be inspected and approved by the QA/QC CONSULTANT and the GEOSYNTHETICS CONTRACTOR prior to placement of the geomembrane lining. 13. All corners/edges of the finished clay liner shall be rounded in preparation for geomembrane lining installation. D. Moisture Control 1. During compacting operations, maintain water content in each lift of the Clay Liner Material within range of 3 to 5 percent greater than the optimum water content. 2. If Clay Liner Material is too dry, add water to material by sprinkling, then mixing or discing to make moisture content uniform throughout lift. 3. Do not attempt to compact Clay Liner Material that contains excessive moisture. Aerate material by blading, discing, harrowing, or other methods, to hasten drying process.