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12. CONTRACTOR shall roll the surface of the Soil Liner Fill with a smooth drum roller to remove ridges and surface irregularities greater than 0.5 inches in height. • CERTIFYING ENGINEER shall determine if surface preparation is sufficient to place geomembrane. On areas with slopes steeper than 3H:1 V, CONTRACTOR shall adopt methods as necessary to obtain the same final surface preparations that would be obtained by the passage of a smooth-drum roller on flat or level ground. Pushing of compaction equipment by tracked equipment shall not be performed. Wheel ruts on the surface of the Soil Liner Fill from grading equipment shall be repaired by CONTRACTOR prior [o placement of the geomembrane by rolling the surface or placing and compacting tailings as approved by CQA Monitor. 13. CONTRACTOR will remove angular protmding rocks greater than 3/4 inches in diameter from the compacted Soil Liner Fill surface. Indentations left in the Soil Liner Fill Surface after removal of the rocks shall be filled with either Soil Liner Fill or tailings approved by CQA Monitor, and compacted to achieve final grade. Areas of the Soil Liner Fill surface with concentrated gravelly areas will have tailings approved by CQA Monitor placed on top and compacted to achieve final grade. A maximum thickness of 0.5 inches of tailings will be placed on the Soil Liner Fill, with no more than 60 percent of the Soii Liner Fill surface being covered by tailings. 14. MANAGER and CERTIFYING ENGINEER will identify any areas of significant desiccation, crusting or erosion of a lift surface. Soil Liner Fill surfaces found to have desiccation cracks greater than 0.25-inches in width or depth, or which exhibit swelling, heaving or other similar conditions shall be replaced or reworked by CONTRACTOR to remove such defects. Desiccation cracks on the Soil Liner Fill surface less than 0.25- inches in width or depth shall be compacted with a smooth drum roller, CONTRACTOR shall take whatever steps necessary to prepare Soil Liner Fill surface to the satisfaction of MANAGER and CERTIFYING ENGINEER, at no additional cost to CC&V. 15. CONTRACTOR shall maintain the Soil Liner Fill surface in a condition suitable for geomembrane installation as specified in these SPECIFICATIONS and in the CQA Plan until the surface is covered. CONTRACTOR shall repair all weather related damage to Soil Liner Fill surfaces or other portions of the Work that have or have not been covered by geomembrane, at no additional cost to CC&V. If any moisture is allowed to collect under the geomembrane prior to or after final seaming and softens the Soil Liner Fiil, the geomembrane shall be removed and CONTRACTOR shall recondition and recompact the Soil Liner Fill to meet all placement and trimming SPECIFICATIONS, at no additional cost to CC&V. 16. CONTRACTOR shall remove all hubs and survey stakes m the Soil Liner Fill and backfill all holes with MANAGER and CERTIFYING ENGINEER approved moisture-conditioned Soil Liner Fill or bentonite. Compact with a Proaor hammer or other suitable device that will achieve a kneading type of compaction and will achieve the required density. 17. CONTRACTOR shall verify the final thickness of Soil Liner Fill to determine compliance with this SPECIFICATION. Thickness verification shall be performed at a minimum frequency of two measurements per acre using a soil coring device, unless directed otherwise by MANAGER. CONTRACTOR shall record as part of the as- built documentation the location, elevation, and thickness of each Soil Liner Fill verification test. CQA Monitor will witness all verification measurements. • CONTRACTOR shall backfill all holes with MANAGER and CERTIFYING ENGINEER approved moisture-conditioned Soil Liner Fill compacted with a Proctor hammer or other suitable device that will achieve a kneading type of compaction and Section 02200 Page 13 of 17 March 22, 2000 Earthworks Golder Associates Revision 7 D~PHASEIV PSSA CERTAPPENDICa;SWPPENDIX E TECFWICAL SPECIFICAriONS\V12000.1 OOC