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r•, 4`1 - <br /> Task 4. Riprap Placement <br /> This task includes- furnishing and placing riprap into the <br /> structure prior to pouring concrete, and replacing riprap <br /> at the bend in the stream downstream from the drop <br /> structure. Some riprap is available onsite by salvaging <br /> rock which was washed out of the drop structure and <br /> deposited downstream, however, some additional rock must <br /> be imported to complete the job as specified. Riprap <br /> shall consist of nominal 2 ft sized boulders and slabs of <br /> durable rock- (granite or limestone; sandstone boulders <br /> are not acceptable) . The rock will be placed into the <br /> prepared foundation area among the projecting steel <br /> anchor bars, and also into the damaged areas of the <br /> existing structure (the two holes in the face of the drop <br /> itself) . The project Manager must inspect the work at <br /> this point prior to proceeding with concrete placement. <br /> b <br /> Task 5. Concrete Placement <br /> This task includes furnishing and pouring concrete into <br /> the riprap structure and damaged areas of the existing <br /> -face of the drop itself. Concrete shall be made using <br /> Type II Portland cement conforming to ASTM C 150. The <br /> mix shall be -designed to produce a minimum compressive <br /> strength of 2000 psi at the 28 day test. Concrete shall <br /> be worked into the rock by means of a suitable mechanical <br /> vibrator -and hand spading so that concrete completely <br /> fills the voids within the rock and anchor bar mat. The <br /> Project Manager must be on site during the concrete <br /> pouring operation. <br /> III. MEASUREMENT AND PAYMENT <br /> Payment for each task shall be made on a lump sum basis <br /> for each item as set forth in the Bid Schedule. <br /> Additional concrete shall only be used at the direction <br /> of- the Project Manager. <br />