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some gravel. <br /> b. Are underwater photographs required? <br /> No, underwater photographs are not required. <br /> ' c. What are the gradation and material requirements for the 24"&36"Riprap? <br /> Per Specification Section 319901,the material requirements shall be according to <br /> Section 1005 of the IDOT Standard Specifications. The riprap specified is outside of the <br /> ' gradations specified by IDOT. Use the following gradation requirements for the riprap: <br /> Stone Dumped Riprap Gradations <br /> ' 24 in 36 in <br /> ' Stone Size Stone Size <br /> %of Total Weight Smaller Than the Range(in.) Range(in.) <br /> Given Stone Size Range <br /> Min. Max. Min. Max. <br /> ' 100 - 48.0 - 72.0 <br /> 85 31.2 43.2 46.8 64.8 <br /> 50 24.0 36.0 36.0 54.0 <br /> ' 15 7.2 12.0 10.8 18.0 <br /> d. Does the Fish Barrier have to be fabricated and installed by AISC certified contractors? <br /> ' Yes,the AISC certifications per Specification Section 051200 are required. <br /> e. Will the City locate the hydraulic lines for the bascule gate operating cylinders for <br /> Contractor's reference? <br /> No, refer to note on Sheet S5 which indicate Contractor shall locate the lines prior to <br /> sawcutting and that extreme care shall be taken when removing concrete around the <br /> lines. There was some discussion on the location of the lines. From inside each cylinder <br /> vault on the downstream face of the spillway the lines are visible entering and departing <br /> ' the vaults as they connect to the individual cylinders. Attached to these minutes is a <br /> photo from the spillway overlay project in which the hydraulic lines are visible. <br /> 5. Site Visit <br /> a. For the upstream, left slope protection pavement work(Sheet Cl),particularly the work <br /> that occurs directly under the US 51 highway bridge,the City indicated that the <br /> Contractor would be allowed to use the median between the northbound and southbound <br /> lanes as a staging area for materials and concrete delivery trucks. Mote that Contractor <br /> would be responsible for all traffic control measures warranted on US 51,as well as <br /> protection of the Contractors material,equipment and personnel located in the median. <br /> b. For work at the Tailwater Dam removal site, local fishermen frequent the site adjacent to <br /> the dam. Contractor is responsible for restricting access to the work area. The City <br /> suggest that a temporary fence may be erected by the Contractor on the north bank of <br /> the river to direct fishermen to locations further downstream from the dam. <br /> Hanson Professional Services Inc. Form OAP 17.2.2,Rev.4 <br />