Reso 2007-1103 - Laserfiche WebLink

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1111�� I II N i 548 -2.6 Backfill Material: Meet the requirements of Sections 105, and 120 except as noted within this Section. Ensure that all backfill material used in the retaining wall volume is free draining (in -place permeability not less than 1 ft /day [300 mm /day]) and meets the requirements of this Section. Have the backfill material tested for every soil type for pH, resistivity, sulfate and chloride content by a Department approved independent testing laboratory prior to placement. Provide certification to the Engineer, that the results have met the requirements of this Section and are signed and sealed by a Professional Engineer, registered in the State of Florida. The retaining wall volume is defined to extend from the top of the leveling pad or footing, or bottom of walls which do not have footing or leveling pads, to the finish grade line and from the face of the wall to a vertical plane passing through the end of the extreme wall component (straps, counterforts, etc.) plus 1 foot [300 mm]. For constructing the retaining wall volume, do not use backfill material containing more than 2.0% by weight of organic material, as determined by FM 1 -T 267 and by averaging the test results for three randomly selected samples from each stratum or stockpile of a particular material. If an individual test value of the three samples exceeds 3 %, the stratum or stockpile will not be suitable for constructing the retaining wall volume. Ensure that the plasticity index as determined by FM 1 -T 090 does not exceed six and the liquid limit as determined by FM 1 -T 089 is less than 15. The pH, as determined by FM 5 -550, shall not be lower than five and not higher than ten, unless approved otherwise by the Engineer, as follows: For walls utilizing non - metallic soil reinforcement, the Engineer may approve using a backfill with a pH value between three and ten, if no metallic structures, such as metallic pipes, are placed within the backfill. Do not use backfill with a pH lower than three or higher than ten. Use backfill for walls using soil reinforcements that meets the following gradation limits determined in accordance with FM 1 -T 027 and FM 1 -T 01 1 : Sieve Size Percent Passing 3 1/2 inches [90 mm] 100 3/4 inch [19.0 mm] 70 -100 No. 4 [4.75 mm] 30 -100 No. 40 [425 µm] 15 -100 No. 100 [150 m] 5 -65 No. 200 [75 µm] 0-15 In addition, for permanent walls utilizing metallic soil reinforcement, use backfill that meets the following electro- chemical test criteria for determining corrosiveness: Criteria Test Method Resistivity: > 30 S2•m FM 5 -551 Sulfate content: < 200 PPM FM 5 -553 Soluble chloride content < 100 PPM FM 5 -552 For walls not using soil reinforcement, use backfill that meets the following gradation limits determined in accordance with FM 1 -T 027 and FM 1 -T 01 1 : March 2007 01000 -123 03- 4122.D z, 14