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1 Fill for units and the one foot zone behind the units shall meet the requirements of <br /> 2 Section 9-03.12(4) for gravel backfill for drains except that 100 percent shall pass <br /> 3 the 3/4" square sieve. <br /> 4 <br /> 5 6-20.3 Construction Requirements <br /> 6 <br /> 7 Since a majority of this work will be performed immediately adjacent to improved private <br /> 8 property, the Contractor shall complete the work in a timely fashion and shall grade and <br /> 9 clean up the areas disturbed by such work at the completion of the backfilling even <br /> 10 though subsequent work may be performed in these areas later in the project. <br /> 11 <br /> 12 Contractor shall excavate to the lines and grades shown on the details and plans. Over <br /> 13 excavation shall not be paid for and replacement with compacted fill and/or wall system <br /> 14 components will be required at Contractor's expense. Contractor shall be careful not to <br /> 15 disturb embankment materials beyond lines shown. <br /> 16 <br /> 17 Foundation Soil Preparation: <br /> 18 <br /> 19 Foundation soil shall be excavated as required for footing dimensions shown on <br /> 20 the construction drawings or as directed by the Engineer. The bottom wall <br /> 21 course(s) shall be embedded a minimum of one inch per each eight inches of wall <br /> 22 height. <br /> 23 <br /> 24 Foundation soil shall be examined by the Engineer to assure that the actual <br /> 25 foundation soil strength meets or exceeds assumed design strength. Soils not <br /> 26 meeting required strength shall be removed and replaced with gravel borrow <br /> 27 compacted to 95 percent of maximum density. <br /> 28 <br /> 29 Unit Installation: <br /> 30 <br /> 31 First course of concrete wall units shall be placed on the base-leveling pad. The <br /> 32 units shall be checked for level and alignment in all directions and insure all units <br /> 33 are in full contact with the base and properly sealed. The first course is the most <br /> 34 important to insure accurate and acceptable results. <br /> 35 <br /> 36 Units are placed side by side for full length of wall alignment. Do not leave gaps <br /> 37 between adjacent units. Alignment may be accomplished by means of a string line <br /> 38 or offset from base line. <br /> 39 <br /> 40 Install fiberglass-connecting pins and fill all voids in units with unit fill material. <br /> 41 <br /> 42 Sweep all excess material from top of units and install next course. Insure each <br /> 43 course is completely unit filled, backfilled, and compacted prior to proceeding to <br /> 44 next course. <br /> 45 <br /> 46 Lay up each course insuring that pins protrude into adjoining courses above a <br /> 47 minimum of one inch. Two pins are required per unit. Pull each unit forward, away <br /> 48 from the embankment, against pins in the previous course and backfill as the <br /> 49 course is completed. Repeat procedure to the extent of wall height. <br /> 50 <br /> HAWTHORNE ELEMENTARY <br /> SAFE ROUTES TO SCHOOL <br /> FED AID#SRTS-0420(021); COE#3540 SP-75 March 16,2016 <br />