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2.02 MIXES: <br />. A. Mix Designs: <br />Concrete mix design shall be designed by an independent testing laboratory. <br />B. Cast-In-Place Concrete: <br />Cast-in-place concrete shall have a minimum 28-day compressive strength of 4,000 psi. <br />2. Maximum Aggregate size of 1-inch. <br />3. Placement slump of between 2-inches and 5-inches. <br />PART 3: EXECUTION <br />3.01 INSTALLATION: <br />A. Ready-Mix Concrete shall be batched, transported, and placed m accordance with ASTM C 94. <br />Each batch delivered to the Site shall be accompanied by a certified weightmaster's delivery <br />ticket. <br />B. All mixed concrete delivered to the Site shall be placed within ninety (90) minutes from the time <br />of introduction of cement and water into the mix. <br />C. No water shall be added after leaving the batch plant without the approval of CERTIFYING <br />ENGINEER. <br />• D. Placement of concrete, once started, shall be performed as a continuous operation until the <br />scheduled placement is completed. <br />E. Cold joints shall be approved by CERTIFYING ENGINEER. <br />Vibrators shall be used only to minimize honeycomb, and shall not be used to move concrete <br />from one location to another. Concrete shall not be moved in the forms more than 5 feet. <br />G. The rock surface within the competent bedrock of the underground working shall be scaled to <br />removed any loose material prior to Cement Plug placement. <br />3.02 CLEANING <br />All form materials and debris resulting from constmction shall be disposed of as directed by MANAGER. <br />3.03 SCHEDULES <br />CONTRACTOR shall notify MANAGER at least forty-eight (48) hours before each concrete placement. <br />3.04 FIELD QUALITY CONTROL <br />A. Concrete testing will be performed by CONTRACTOR. <br />B. Four standazd 6-inch diameter by 12-inches long test cylinders shall be prepazed for every 50 <br />yazds of concrete placed or one per day, whichever is greater, at the discretion of the <br />MANAGER, DESIGN ENGINEER and CERTIFYING ENGINEER. <br />• <br />Section 03320 Page 2 of 3 March 22, 2000 <br />Concrete Plug Golder Associates Revision 1 <br />1'\0012207\OCWICIXTREP080241PPENDSWPPEIDl30R1 DOC <br />