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kk I In k IN IN IN IN IN I IN IN IN N4 I IN IN IN 14 548-2 . 6 Backfill Material : 548-2 . 6. 1 General : Provide compacted select backfill or flowable fill within the retaining wall volume when the option for flowable fill is shown in the plans . 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. 548-2 . 6. 2 Compacted Select Backfill : Meet the requirements of Sections 105 and 120 except as noted within 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. 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 material is non-plastic as determined by AASHTO T 90 and the liquid limit as determined by AASHTO T 89 is less than 15 . The pH, as determined by FM 5 - 550 , shall not be lower than five and not higher than nine . Use backfill for walls using soil reinforcements that meets the following gradation limits determined in accordance with AASHTO T 27 and FM 1 -T 011 : Sieve Size Percent Passing 3 1 /2 inches 100 3 /4 inch 70 - 100 No . 4 30- 100 No . 40 15400 No . 100 0- 65 No . 200 0 - 12 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: > 3000 ohm - • cm FM 5 - 551 Soluble 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 AASHTO T 27 and FM 1 -T 011 : - 158 - FPID ( S ) : 423186 - 1 - 58 - 01