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(A) Geotechnical investigations prior to construction. The developer shall submit a soils report including soil borings at a maximum interval along street centerlines of 500 feet. The minimum depth of boring shall be five feet below profile grade, or two feet below the storm or sanitary sewer, whichever is greater. Not less than two borings shall be taken per street. American Association of State Highway and Transportation Officials soils classifications, gradation, determination of water table elevation (24- hour test), and anticipated wet/dry season fluctuation shall be included in the report.
(B) Clearing and grading of rights-of- way. The developer shall clear all rights- of-way and recovery areas, which shall conform to minimum standards, according to the "Manual of Uniform Minimum Standards for Design, Construction, and Maintenance for Streets and Highways," prepared by the State Department of Transportation, in accordance with F.S. § 335.075. Trees may be selectively cleared away from the recovery area, and all grades, including grades for streets, alleys, and drainage, shall be consistent to grades approved for the subdivision. All debris shall be moved from rights-of-way.
(1) All unstable materials, such as muck, peat, plastic clays, or marls shall be removed from roadbed areas. The areas then shall be backfilled with suitable material, and the subgrade stabilized to a depth of ten inches or twelve inches depending upon the functional classification of the street below the base course, to 75 pounds per square inch bearing value. The materials to be added for stabilization, if needed, shall be either high bearing soil, sand clay, ground limerock, or any other material which is suitable. Muck shall not be used. For rural sections, subgrade shall be stabilized to include the entire width of both shoulders. Where curb and gutter are utilized, subgrade shall be stabilized underneath curb and for a distance of one foot beyond the back edge of curbs.
(2) Written test results, taken by a competent testing laboratory, shall be submitted giving bearing value sufficient to obtain uniform results for each and every type of soil appearing in the roadbed at least every 250 feet, or at random location designated by the City Inspector.
(3) After the subgrade is mixed, brought to grade, and ready for the base course construction, it shall be tested for density. Written test results by a competent testing laboratory shall be submitted showing not less than 98% modified maximum density for samples taken not more than every 250 feet apart alternating from side to center, thence to opposite side and back to center; or, in addition, wherever the City Inspector may require. The City Inspector must be present when the samples are taken.
(4) Separate test results will be required if stabilization is performed under curb areas separately from stabilization of the roadbed.
(D) Base courses.
(1) Base courses acceptable to the city shall be eight inches thick for all arterial streets, all collector streets, and all streets in a commercial or industrial subdivision, and six inches thick for residential and local streets.
(2) Base courses shall consist of compacted Ocala limerock or soils cement. Base courses shall extend six inches beyond edge of paving where curb and gutter is omitted.
(a) Limerock base courses.
1. This base course, including the materials to be used, shall be constructed in accordance with the latest applicable State Department of Transportation specifications, and shall be compacted in one layer if six inches thick, or two layers if eight inches thick.
2. Following compaction, written test results completed by an independent testing laboratory shall be submitted to the City Inspector showing not less than 98% modified maximum density (as determined by the American Association of State Highway Officials Specification T-180) for samples taken not more than every 250 feet apart, alternating from side to center, or, in addition, wherever the City Inspector may require. The City Inspector must be present when the samples are taken.
3. Tests shall be required for each layer if construction is in two layers. The contractor shall make borings in areas designated by the City Inspector to enable measurement of thickness.
4. Finished limerock base courses shall be primed without delay, and continuously maintained free of damage until the wearing surface is applied. The wearing surface shall be applied immediately upon completion, but, in no case, later than 15 days.
(b) Soil cement base course.
1. The composition and consistency of this base course shall be under the design and construction supervision of a competent commercial engineering and testing laboratory which shall have an engineer registered in this state as one of the responsible officials of the laboratory. Design mix and test results shall be submitted to the City Engineer prior to construction. Sufficient mixing shall be performed to produce a homogeneous mix of uniform color, and a City Inspector shall be called and inspection shall be made prior to commencing mixing operations.
2. Soil cement base courses shall not be constructed until after subgrade construction has been completed and required subgrade test results have been submitted in writing and approved by the City Inspector.
3. The finished base course shall be primed without delay, protected from heavy traffic, and continuously maintained free of damage until the wearing surface is applied. If not barricaded, and light traffic is permitted over the completed and primed base course, it shall be sanded sufficiently to prevent pickup. All bad areas shall be cut out and replaced.
4. Assuming acceptable curing, the wearing surface shall be applied no sooner than seven days and no later than 30 days after completion.
5. The contractor shall make borings in areas designated by the City Inspector to enable measurement of thickness.
(E) Wearing surface.
(1) The material used for the wearing surface shall be a State Department of Transportation asphaltic concrete mix or State Department of Transportation modifications thereof, having a Jubbard-Field Stability or Marshall Stability, in accordance with State Department of Transportation specifications, of not less than 2,000 pounds. See Section (I), Standards for wearing surface thickness. On all streets the wearing surface shall be constructed at twice the largest aggregate size used in the mix. Ponded water due to paving inaccuracies shall be limited to a water depth of no greater than one-fourth inch. Ponding in excess of this depth shall require correction.
(2) A certified copy of the design mix shall be filed with the city, stating the type of design stability of the product used.
(3) The completed road shall be guaranteed by a maintenance bond for a period of two years.
(F) Friction course.
(1) On arterial and major collector streets, pavements shall be designed and constructed so as to maintain adequate skid resistance. A durable skid resistant surface texture shall be incorporated in the pavement to allow for adequate friction capabilities between the vehicle tires and the roadway surface. The friction courses allowed for use are FC-1, FC-2, and FC-4 as directed by the City Engineer.
(2) The required materials, composition, job mix formula, plant and equipment shall conform to the latest Florida Department of Transportation's Specification for Road and Bridge Construction.
(Ord. 241, passed 11-27-85; Am. Ord. 640, passed 6-3-93) Penalty, see § 23