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6. The EARTHWORK CONTRACTOR shall notify the OWNER at least 3 working days in advance of when the subgrade is completed and ready for as - built surveys. The OWNER will survey the top of the base and slope subgrade in accordance with Section 01410, SURVEYS. The survey shall provide coordinates and elevations of the subgrade surface at a minimum of 75 -foot centers and delineating prominent features. The results of the survey will be provided to the QA/QC CONSULTANT within 2 days of the survey for approval prior to placing overlying materials. The QA/QC CONSULTANT shall have 2 working days to review survey results and may independently verify survey results. The time taken by the QA/QC CONSULTANT in checking and verifying the survey results will be considered included in the total calendar days allotted the EARTHWORK CONTRACTOR before liquidated damages are assessed. B. After completion of clay liner and subgrade fill, proof -roll the surface of the entire lined area with a loaded dump truck or similar heavy -wheeled equipment to detect soft or loose zones. Notify the QA/QC CONSULTANT prior to commencement of proof -rolling. If soft or loose zones are found, excavate the soft or loose material to a depth accepted by the QA/QC CONSULTANT, then fill with Clay Liner or General Earthfill, as appropriate. The Clay Liner or General Earthfill shall be compacted as specified for such fill. 3.9 CONSTRUCTION OF CLAY LINER A. General: 1. Clay Liner Material shall be processed to meet the requirements of Article 2.4 of this Specification. The EARTHWORK CONTRACTOR may request information from the OWNER on successful processing and placement procedures used for the construction of previous WMUs at the Forward Landfill. The EARTHWORK CONTRACTOR shall have the option to determine construction procedures to be used, subject to the approval and acceptance testing by the QA/QC CONSULTANT. 2. The EARTHWORK CONTRACTOR shall process the Clay Liner Material suitable for the purpose intended. After processing, the Clay Liner Material shall be free from dry clods, roots, organic matter, frozen material, debris, rocks or stones larger than 1 inch, and other deleterious material. Clay Liner Material shall be thoroughly blended and compacted to provide a homogeneous material relatively uniform in gradation and moisture content. 3. The Clay Liner Material shall be as uniform as possible, free of penetrating cracks, and having interlift boundaries completely blended. The soil shall be kneaded by multiple passes with a heavy -weight footed compactor in order to produce a soil structure having low hydraulic conductivity, and not simply achieving a relative compaction goal. The top surface shall be smooth, graded to the grades shown on the Construction Drawings, and ready to receive overlying components of the lining system. The prepared surface shall be free of major irregularities, which in the opinion of the QA/QC CONSULTANT, may damage the overlying geomembrane. Forward Landfill WMU FU -06 02300 14 EARTHWORK