SUBJECT:
Title
Sumatra Estates - Improvement Plan 33497 - Waiver to Improvement Plan in Review
Parcel #: 37506-000-00 # WaiverPIR-000743-2026
Tillman & Associates Engineering, LLC
LDC 6.13.7.B Geotechnical criteria
CODE states Minimum requirements. (1) Depth. Soil test borings shall be performed to a minimum depth of 10 feet below the proposed finished grade of the bottom of all retention/detention areas or the permanent pool elevation and once the data has been obtained the hole shall be backfilled and compacted. (2) Number of tests. At least two tests shall be performed within the boundary of each proposed retention/detention area. For each half acre of pond bottom area and for each lineal retention/detention area of 250 feet, an additional test shall be conducted. The County Engineer or his designee, may require additional tests if the initial tests indicate the need for them. (3) Infiltration/permeability tests. For retention/detention areas utilizing percolation or infiltration in the design model, there shall be a minimum of two infiltration rate tests for each retention/detention area. Data used for soil permeability testing or infiltration analyses for the retention/detention areas shall be signed and sealed by a professional engineer or professional geologist for both data and procedural accuracy. (4) Aquifer parameters. The estimated seasonal high ground water elevation and confining layer shall be clearly identified.
APPLICANT - Request a waiver to reduce the required number of borings from seven to five for this DRA. The proposed DRA surrounds an existing wetland, and the soft, wet ground limited drilling rig access. Because of these conditions, only five soil borings could be completed. The five borings obtained show a consistent soil profile across the area and provide sufficient information for design.
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