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Kvaerner Metal ~ Project No. 306900 Gener ecification No. GC-78 Geosynthetic Liner The subgrade surface. on which the HDPE will be placed. shall be compacted smooth to the regwred density and shall be free of rocks and sharp particles. Atl such partfctes shall be removed by raking, broomrng, or hand picking as necessary just prior to the placement of the liner. The surface shall be inspected and approved by the Engineer. Horizontal field seams on slopes shall be kept to a minimum. Seams shall be made by lapping the uphill panels over the downhill panels. The HDPE panels shall be placed over the prepared subgrade one at a time and shall be seamed to the adjacent panels immediately after placement. Adequate temporary anchoring of the panel shall be provided to protect the material from damage due to the wind. Geotextrle fabric may be regwred under the membrane panels in rough areas, when requested by the Engineer. All personnel working or walking on the deployed panels shall wear sofr-sole shoes. The HDPE shall be installed in a relaxed condition and shall be free of tension or stress upon completion of the work. Stretching of the matenai to fit. will not be allowed. Plastic sand bags shall be used. as regwred, to hold the liner panels in position during installation. flags shall be sufficiently close knit to keep the fines from working through the bottom. sides or seams of the bags. Each bag shall contain adequate quantity of sand and shall be tied closed after filling. Sand bags, rf used to ballast the liner, shall be removed after the joints are fused together and the permanent anchorages are complete. Continuous loading is required along leading edges of panels. in case of high wind. Anchor trenches shall be excavated by the Contractor to the lines and grade shown on the drawings. Slightly rounded edges shall be provided, where HDPE adjoins the trench. to avoid sharp bends in the material. Anchor trenches shall be backfilled and compacted as directed by the Engineer. Care shall be exercised in backfillinq the trenches as to prevent any damage to the liner. Panel placement shall not proceed at an ambient temperature below a0°F (5°C), or above 104'F {40'C) as measured at HDPE surface. Deployment shall not be done during any precipitation. in the presence of excessive moisture, in an area of ponded water. or rn the times of excessive winds. Seaming of joints shall be done by extrusion process, using the manufacturer's recommended procedures and equipment. The surfaces of joint shall be cleaned of motsture, dust, dirt, debris and oxidation, not mare than one hour prior to welding. S.U WORKMANSHIP Prior to commencing the work. Contractor shall certify, in writing, that the surface on which the HDPE viol be installed is acceptable. Thereafter, it shall be the Contractors resportsrbitity to maintain the prepared soil surface. Any damage to the subgrade caused by this installation shall be repaued at Contractors expense. The sod surface shall be observed daily by the Contractor to evaluate the surface condition. Changes in ~ ~y0wy~ptlhR171~{1Ci1GC101VC OoC. Rw NI 7 Vwr hp~ 1t. 1~