SUBJECT:
Title
Sandy Clay Residential Improvement Plan #000425 - Waiver to Improvement Plan in Review
Parcel #: 37896-000-00, 37896+000-0 #WaiverPIR-000738-2026
Tillman & Associates Engineering, LLC
LDC 6.12.9. H - Subdivision roads
CODE states Dead end roads shall not exceed 1,500 feet and shall have a cul-de-sac at the terminal end. Refer to details in Section 7.3.1. Dead end roads intended to provide future access to adjacent unplatted areas may be permitted without a cul-de-sac provided that no lots front thereon, the length does not exceed 1,500 feet, and appropriate temporary end-of-road markers are provided.
APPLICANT requests a waiver to use the alternative provided. Dead end road without cul-de-sac. A hammerhead with dead end segments less than 150' in length have been provided as an alternative turn around.
LDC 2.12.8 - Topographical Contours
CODE states Current boundary and topographic survey (one foot contour intervals extending 100 feet beyond the project boundary) based upon accepted vertical datum. Surveys will be less than 12 months old and accurately reflect current site conditions, meeting standards set forth in Ch. 5J-17 FAC. Alternate topographic data may be accepted if pre-approved by the Marion County Land Surveyor.
APPLICANT - A waiver is requested for survey more than 12 months old. The existing waiver requested for number of borings in DRAs 5 & 7. We have provided a survey from October 2022, and the project area has an approved mass grading plan. Active mass grading makes updating the survey impractical. An updated survey covering the DRA 5 & 7 area, and adjacent SE 92nd Loop and SE 110th Street Rd right of ways, was completed February 2026.
LDC 6.13.7 - Geotechnical Criteria
CODE states A. Methodology. The pattern and type of test borings shall be determined by the project engineer, geotechnical engineer, or geologist based on the project size, type, and complexity. (1) Infiltration/permeability rate tests shall follow methods acceptable to the governing State agency and shall be performed at the depth and location which will provide representative test results for use in the design of the retention/detention area. Soil identifications shall refer to the AASHTO Soil Classification System conforming to AASHTO Designation M 145-91. (2) Where visual reconnaissance, available published data, and/or initial borings suggest high karst sensitivity or lithologic variability, additional borings may be required if deemed necessary by the County Engineer or his designee. B. 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. C. Design considerations. (1) The estimated seasonal high water elevation and the confining layer shall be set no lower than the bottom of the boring for the purposes of stormwater system modeling. (2) The pond bottom elevation of a stormwater facility shall be designed a minimum of 1 foot above the estimated seasonal high water elevation. When the pond bottom is within 1 foot of the estimated seasonal high water elevation, a 50 percent reduction factor shall be used for percolation or ground water mounding analysis shall be included.
APPLICANT - Waiver requested for number of borings in DRAs 5 & 7. We have provided a survey from October 2022, and the project area has an approved mass grading plan. Active mass grading makes updating the survey impractical. An updated survey covering the DRA 5 & 7 area, and adjacent SE 92nd Loop and SE 110th Street Rd right of ways, was completed February 2026. One boring per acre rather than one boring for every 0.5 acre. The underlying soils are generally consistent, and the provided number of borings is sufficient to determine stormwater modeling parameters. No limestone was encountered in the DRA 5 & 7 area. Additionally, DRAs 5 & 7 are existing, constructed dry retention ponds that have been functioning without issue.
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