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3.12 INSTALLATION SCHEDULE <br />A. Concrete for all structures shall have minimum compressive strength at 28 days of 3000 psi <br />unless otherwise indicated on the drawings. <br />3.13 FIELD CONTROL <br />A. The Contractor shall advise the Engineer of his readiness to proceed at least one working <br />day prior to each concrete placement. The Engineer will inspect the preparations for <br />concreting including the preparation of previously placed concrete, the reinforcing and the <br />alignment and tightness of formwork. No placement shall be made without the prior <br />approval of the Engineer. <br />B. The Engineer may have cores taken from any questionable area in the concrete work such <br />as construction joints and other locations as required for determination of concrete quality. <br />The results of tests on such cores shall be the basis for acceptance, rejection or determining <br />the continuation of concrete work. <br />C. The Contractor shall cooperate in obtaining cores by allowing free access to the work and <br />permitting the use of ladders, scaffolding and such incidental equipment as may be <br />required. The Contractor shall repair all core holes to the satisfaction of the Engineer. The <br />work of cutting and testing the cores will be at the expense of the Owner if cores test <br />satisfactorily and will be at the expense of the Contractor if cores test unsatisfactorily. <br />END OF SECTION <br />1 06/05 03300 -13 03- 4138.B <br />