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<br /> <br /> Forward Compost Facility Stormwater Improvements 02300 9 EARTHWORK <br /> H. The CONTRACTOR shall excavate to sufficient lines and grades to construct the <br />ditches, trenches, pond, and sump as shown on the Construction Drawings and <br />described in these Specifications. <br /> <br />I. Shape, trim, and cut ditches and other drainage structures as necessary to achieve <br />grades and dimensions shown on the Construction Drawings. <br /> <br /> J. Excavate and remove loose and wet materials from the base of the existing <br />sedimentation pond and scarify the surface prior to placing general earthfill. <br /> <br /> <br />3.5 LIMITS OF EXCAVATION <br /> <br />A. Excavate to the depths and widths, as shown on the Construction Drawings. <br />Allow for minimum thickness of clay liner as required. Excavation carried below <br />the grade lines shown or established by the DESIGN ENGINEER shall be <br />replaced with the same fill material as specified for the overlying fill or backfill, <br />and compacted as required for such overlying fill or backfill. Where the overlying <br />area is not to receive fill or backfill, replace the overexcavated material and <br />compact to a density not less than that of the underlying ground. Cuts below <br />grade shall be corrected by similarly cutting adjoining areas and creating a smooth <br />transition. Correct all overexcavated areas at the EARTHWORK <br />CONTRACTOR's sole expense. <br /> <br />3.6 STOCKPILE ACTIVITIES <br /> <br /> A. Stockpile all excavated material. Uniformly grade stockpile area to conform to <br />existing contours, leave with a neat appearance, and maintain current drainage <br />patterns. The stockpile shall have a slope no greater than two horizontal to one <br />vertical and the top surface shall have a minimum 5 percent grade. <br /> <br /> <br />3.7 GRADING AND SUBGRADE PREPARATION <br /> <br /> A. This Work shall consist of fine grading and preparation of lining subgrade for the <br />construction of the base and side slope lining. The lining subgrade is further <br />defined as those areas and surfaces within the subgrade upon which lining <br />materials are to be placed. <br /> <br />1. Fine grading shall be performed to grade the subgrade to within the tolerances <br />specified in Section 01410, SURVEYS. <br /> 2. The prepared subgrade surface shall be smooth and free of major irregularities. <br />The subgrade should contain no exposed particles larger than 3 inches or other <br />surface irregularities which, in the opinion of the QA/QC CONSULTANT, <br />will damage the overlying GCL, or 60-mil HDPE geomembrane. <br /> 3. Overexcavation below the established lining subgrade by the EARTHWORK <br />CONTRACTOR shall, at his expense, be backfilled with General Earthfill <br />Material as directed by the QA/QC CONSULTANT. <br /> 4. Once completed, all traffic shall be kept off the lining subgrade.