City of Frisco Engineering Standards

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Engineering Standards Version 6/19/12 5. Test for sulfates in the upper 3’ of the subgrade in each boring using EPA 9038 or EPA 375.4 with 10:1 dilution ratio. Provide sufficient testing to determine with reasonable certainty the levels of sulfate present. 6. Provide engineering recommendation regarding acceptable sulfate levels for each soil type at the required lime stabilization content. See 3.03.F below 7. Perform a lime stabilization series for each soil type expected to be in the upper 12” of the subgrade. The Eades-Grimm method of pH testing shall be used to obtain a beginning point. Additional testing shall be performed for each soil type to determine lime content. Minimum Design Criteria are: pH = 12.4 after mellowing (ASTM D 2976) Swell potential
Engineering Standards Version 6/19/12 2. PVR-TxDOT Tex-124-E Alternative: The PVR shall be calculated based upon 20’ moisture penetration and shall provide moisture treatment depth to limit the PVR to 4.5”. Submit all calculations and assumptions involved in calculating the PVR and the recommended depth of moisture treatment to the City for review upon request. 3. Moisture treatment to a minimum of 3 percentage points above optimum moisture content at a minimum of 95 percent standard Proctor (ASTM D 698) shall be required for at least 2’ of the subgrade. Thicker zones of moisture treatment may be required depending upon the average swell potential. The thickness shall be determined in accordance with Figure 3.1 or as determined by calculations. Type A & B Type C D E F G Alleys FIGURE 3.1: Recommended Depth of Moisture K. The upper portion of the subgrade shall be lime stabilized in accordance with the laboratory determined lime percentage. A minimum subgrade thickness of 8” for residential streets and 12” for arterial streets shall be lime stabilized. L. Moisture treatment and lime stabilization shall extend at least 4’ beyond the edge of pavement. A moisture barrier consisting of at least 10 mil poly sheeting shall be placed horizontally on the subgrade beyond the pavement edge and extend at least 6’ on either side of the pavement neat line after final compaction. The barrier shall be covered with at least 8” of lightly compacted soil. 3.04 Pavement Design Requirements A. The roadway pavement thickness shall be based on subgrade investigation and Pavement Design Catalog. Section 3 – Pavement and Subgrade Design Requirements May 2012 Page 3-5
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City of Frisco Engineering Standards

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