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<br />.., <br /> <br />. <br /> <br />r"I <br /> <br />. 548-2.6 Backfill Material: Meet the requirements of Sections 1 05, and 120 except <br />as noted within this Section. Ensure that all backfill material used in the retaining wall <br />,..., volume is free draining (in-place permeability not less than 1 ft/day [300 mm/day]) and <br />. meets the requirements of this Section. Have the backfill material tested for every soil type <br />for pH, resistivity, sulfate and chloride content by a Department approved independent <br />., testing laboratory prior to placement. Provide certification to the Engineer, that the results <br />. have met the requirements of this Section and are signed and sealed by a Professional <br />Engineer, registered in the State of Florida. The retaining wall volume is defined to extend <br />,., from the top of the leveling pad or footing, or bottom of walls which do not have footing <br />. or leveling pads, to the finish grade line and from the face of the wall to a vertical plane <br />passing through the end of the extreme wall component (straps, counterforts, etc.) plus <br />., 1 foot [300 mm]. <br />. For constructing the retaining wall volume, do not use backfill material <br />containing more than 2.0% by weight of organic material, as determined by FM 1-T 267 <br />..., and by averaging the test results for three randomly selected samples from each stratum or <br />. stockpile of a particular material. If an individual test value of the three samples exceeds <br />3%, the stratum or stockpile will not be suitable for constructing the retaining wall volume. <br />., Ensure that the plasticity index as determined by FM 1- T 090 does not <br />. exceed six and the liquid limit as determined by FM 1- T 089 is less than 1 5. The pH, as <br />determined by FM 5-550, shall not be lower than five and not higher than ten, unless <br />" approved otherwise by the Engineer, as follows: For walls utilizing non-metallic soil <br />. reinforcement, the Engineer may approve using a backfill with a pH value between three <br />and ten, if no metallic structures, such as metallic pipes, are placed within the backfill. Do <br />,., not use backfill with a pH lower than three or higher than ten. <br />. Use backfill for walls using soil reinforcements that meets the following <br />gradation limits determined in accordance with FM 1-T 027 and FM 1-T 011: <br /> <br />,., <br /> <br />r"'1 <br /> <br />Sieve Size Percent Passing <br />3 1/2 inches [90 mm] 100 <br />3/4 inch [19.0 mm] 70-100 <br />No.4 [4.75 mm] 30-1 00 <br />No. 40 [425 11m] 15-100 <br />No. 100 [150 11m] 5-65 <br />No. 200 [75 11m] 0-15 <br /> <br />. <br /> <br />. <br /> <br />.., <br /> <br />. <br /> <br />..., <br /> <br />. <br />In addition, for permanent walls utilizing metallic soil reinforcement, use <br />backfill that meets the following electro-chemical test criteria for determining <br />corrosiveness: <br /> <br />. <br /> <br />r'1 <br /> <br />,., <br /> <br />Criteria Test Method <br />Resistivity: > 30 Q.m FM 5-551 <br />Sulfate content: < 200 PPM FM 5-553 <br />Soluble chloride content < 100 PPM FM 5-552 <br /> <br />. <br /> <br />. <br /> <br />,.., <br /> <br />. <br /> <br />For walls not using soil reinforcement, use backfill that meets the following <br />gradation limits determined in accordance with FM 1-T 027 and FM 1-T 011: <br /> <br />,..., <br /> <br />. <br /> <br />,.., <br /> <br />09/09 <br /> <br />01000-1 23 <br /> <br />03-4122.F <br /> <br />- <br />