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KLEINFELDER 5 CONSTRUCTION CONTROL 5.1 STOPPAGE OF WORK The SJDPW, as project administrator and engineer, will control construction work. The construction forces, whether operators of SJDPW or a construction contractor to the County, will be under the supervision of the project engineer and direct supervision'of the field construction supervisor. Kleinfelder will observe construction activities and advise the County of deficiencies in the quality of work observed through field observation, review of the SJDPW field notes, or CQA test data. In addition, regulatory agencies such as the LEA, CIWMB, or RWQCB may observe construction and may request that the Project Manager/Engineer stop work if they perceive deficiencies. 5.2 GRADE CONTROL The SJDPW (or a qualified land survey contractor) will provide grade stakes and survey control notes and guidance to construction operators during the project. The SJDPW will check that the grades called out in the field staking are in accordance with the Closure ,T Plan, or an approved as-built modification by the Engineer, and provide direction to the operators of deficiencies for corrective action. The grade control for the following will be verified using grade control stakes at 100-foot centers: • Top and thickness of foundation ® Barrier layer • Top of vegetative layer The vertical control accuracy will be plus or minus 0.05 feet. All surveys shall be based on the permanent bench marks in-place at the site used to control closure construction according to the County's landfill horizontal and vertical datum. CR9-42 Page 16 of 28 Copyright 1991 Kleinfelder, Inc.