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<br /> <br />Mr. Frank M. Akers <br />September 23, 1991 <br />Page 4 <br /> <br />4 <br /> <br />The request for a minimum 6-inch concrete cover over the reinforcing <br />is presumably for scour protection. Inspection of the existing structure <br />reveals no appreciable abrasion of the concrete even during several <br />years of extensive channel work upstream which likely produced <br />sediment loads far in excess of normal. In general, the greater the <br />concrete cover, the greater the width of shrinkage cracks. It is our <br />recommendation that the cover remain 4 inches. <br /> <br />5 <br /> <br />Design calculations for the pier are attached as Appendix B. <br /> <br />6 <br /> <br />Specification Section 03200 requires submittal of bar placement <br />drawings, bar lists, bending details, mill certificates, and bar tags as <br />product data. Product data is defined and discussed in specification <br />Section 00710. <br /> <br />7,8 <br /> <br />Submittals will be required from the contractor for specification <br />Sections 05100 and 05505. <br /> <br />9 <br /> <br />It is agreed thaLthc.discussion of pile supported footings in Section <br />02200 is superfluous. .. The,projcct has already bid, however, and this <br />did not appear to cause confusion for the contractors. <br /> <br />10 <br /> <br />The reference to Section 01300 in Section 03300 is incorrect. The <br />section that should have been referenced is 00710 which is in the <br />contract specifications. <br /> <br />11 <br /> <br />The reference to tanks in Section 03300 is superfluous. This will be <br />clarified with the contractor. <br /> <br />12 <br /> <br />It is agreed that "grout" was incorrectly spelled. <br /> <br />13 <br /> <br />The adhesive waters top is a single component extruded plastic strip <br />that adheres to the concrete. It has no distinct cross section as does <br />a PVC waterstop. TIle adhesive waterstop is specified in Section <br />03300. <br /> <br />14 <br /> <br />There are no aluminum products on this project. <br /> <br />15 <br /> <br />It is agreed that note 7 on sheet 9 should read "I-inch diameter". <br /> <br />16 <br /> <br />It is agreed that note 9 on sheet 9 should read "to" rather than "tIO". <br /> <br />Brown and Caldwell <br />Consultants <br /> <br />21-5993{js <br />