127.40(A) General.
127.40(A)(1) Catch basin grates and rim elevations as shown on plans may be adjusted to conform to new or existing grades after approval from the
is obtained who shall consult with the
prior to any adjustment.
127.40(A)(2) Distances and lengths shown on plans and profile drawings shall be referenced to the center of structures.
127.40(A)(3) All catch basin grates shall be oriented to align with centerline or radius of drive.
127.40(B) Materials.
127.40(B)(1) All stormwater pipes and conduits shall conform to the FDOT Design Manual and Standard Plans for Road and Bridge
, latest edition.
127.40(B)(2) The rip rap headwalls, which will be provided on an as needed basis, shall be constructed of sand/cement with a minimum 2000 PSI compressive strength to meet FDOT standards. The bags shall be permeable burlap, cloth or paper. A concrete cap shall be poured on top of sand/cement rip rap bags with a minimum of 3000 psi compression strength.
127.40(B)(3) All drainage structures shall be precast concrete. Block or poured-in-place catch basins will be allowed only where pre-cast is problematic and only upon approval of the
. The minimum wall and slab thickness shall be eight inches and the minimum reinforcing shall be No. 4 bars at 12 inches each way, unless otherwise indicated. Concrete shall be minimum compressed strength of 3,500 PSI at 28 days.
127.40(C) Installation.
127.40(C)(1) Pipe shall be placed on stable granular material, free of rock formation, other foreign formations, and constructed to uniform grade and line.
127.40(C)(2) Backfill material shall be well graded granular material, well tamped in layers, not to exceed six inches.
127.40(C)(3) Provide a minimum protective cover of 18 inches over storm
and avoid unnecessary crossing by heavy construction vehicles during construction.
127.40(C)(4) The contractor shall notify the local water control district at least 24 hours prior to the start of the construction and inspection.
127.40(D) Storm Drainage pre-treatment/exfiltration system.
127.40(D)(1) Any conflict with existing or proposed utilities shall immediately be brought to the attention of the
. Any impermeable material encountered in the excavation for the drainfield shall be removed as directed by the
.
127.40(D)(2) The trench liner shall be used on the sides and top of a drainfield ditch. The top section of the material shall be lapped a minimum of 24 inches and the contractor shall take extreme care in backfilling to avoid bunching of the fabric.
127.40(D)(3) Perforated pipe within the drainfield shall have three-eighths-inch perforations 360 degrees around the pipe with approximately 120 perforations per foot of pipe.
127.40(D)(4) Perforated pipe shall terminate five feet from the drainage structure. The remaining five feet shall be non-perforated pipe.
127.40(D)(5) Pipes shall terminate at an additional catch basin or a clean out structure.
(Ord. 2010-20, passed 10-4-2010; Am. Ord. 2019-12, passed 9-23-2019)