GOVERNING SPECIFICATIONS for Development Design and Construction

Transcription

1 GOVERNING SPECIFICATIONS for Development Design and Construction Unless otherwise noted all references are to the latest editions of the: FDOT Standard Specification for Road and Bridge Construction (FDOT Section) FDOT Design Standard Index (FDOT Index) FDOT Manual of Uniform Minimum Standards for Streets and Highways Manual on Uniform Traffic Control Devices (MUTCD) 1. Asphalt: FDOT Section 320, 330 and Base: FDOT Section 200 ~ Subgrade: FDOT Section Grassing: FDOT Section Sodding: FDOT Section Stripes & Markings: FDOT Section 710 & Retroflective Pavement Markers FDOT Section 706 and Signage: See FDOT Index 11860, 11862, 11865, 17302, 17357, and Guardrail Components - See FDOT Index 400 and FDOT Section Maintenance of Traffic - See FDOT Index 600 series and MUTCD GENERAL NOTES: 1. All construction shall be completed by a contractor licensed with the State of Florida. All paving shall be completed by a contractor prequalified with the Florida Department of Transportation. 2. All roadway surveying, layout and benchmarks shall be performed under the direct supervision of a surveyor licensed in the State of Florida and shall conform to the requirements of 61G17-6, FAC and Section 5-7, FDOT Specifications. 3. All roadway and drainage construction and materials shall be per FDOT standards and specifications. Materials shall meet FDOT specifications and shall be produced or obtained from an FDOT approved source. 4. The minimum criteria for design shall meet or exceed the more stringent requirement required by the Taylor County Land Development Regulations or the FDOT Manual of Uniform Minimum Standards for Streets and Highways. 5. Roadway construction plans shall include the following minimum requirements: a. Notes and Construction Specifications b. Typical Sections c. Stationed and dimensioned Horizontal Alignment d. Finish Grade Centerline, Right and Left Ditch profiles w/ all points of inflection and curvature labeled with station and design information e. Cross sections: i. Existing and Finish Grade surfaces ii. Existing and Finish Grade Centerline elevations F:\Engineering\Land Development Regulations\Development Construction Guidelines.doc Page 1 of 3

2 iii. Asphalt, Base and Subgrade limits and thicknesses f. Offset and Station for all stormwater facilities, utilities, signage, and pavement markings g. Invert, slope, diameter and dimensions for all stormwater facilities and outfall structures h. Location and description of erosion and sedimentation control measures i. Location and results on on-site geotechnical investigation j. Project Limit of disturbance 6. Any public land corner within the limits of construction is to be protected. If a corner monument is in danger of being destroyed and has not been properly referenced, the Contractor shall notify the County Engineering Division without delay. Any survey monuments removed by the Contractor without reference being established, shall be replaced by the Contractor at his expense. 7. Any existing benchmarks are to be reestablished by the Contractor's licensed surveyor, if disturbed. 8. The horizontal location and vertical elevation of all existing utilities within the limits of construction shall be field verified prior to commencing work and the Contractor shall coordinate with the utility company to relocate utilities as required. 9. Care shall be exercised to avoid damage to all existing utilities. The repair and/or replacement of all existing utilities damaged or destroyed during the construction shall be the Contractor's responsibility. 10. Care shall be exercised to avoid damage to all trees protected by Taylor Code of Ordinances Section Tree protection zones shall be enclosed by fencing or similar barrier. 11. All unsuitable material encountered shall be undercut beneath the proposed limerock base course to a depth of 24" (in) below the bottom of the base and shall be backfilled with clean suitable fill. 12. All backfill and borrow material (or embankment) shall meet the requirements of FDOT Index 500 and 505 and shall be furnished by the Contractor from areas provided by the Contractor and approved by the County Engineering Division. 13. Construction materials shall be stockpiled in safe areas acceptable to the County Engineering Division. No materials are to be wind-rowed on the pavement or shoulders. 14. Only the excavation for base placement and pipe trenches that can be backfilled by the end of the work day will be excavated. No open pipe trench or roadway excavation will be allowed to remain after work ends for the day. F:\Engineering\Land Development Regulations\Development Construction Guidelines.doc Page 2 of 3

3 15. All undamaged existing signs shall be relocated in accordance with FDOT Index Relocation shall be considered a part of maintenance of traffic. Contractor shall install new signs to replace damaged or missing signs. All damaged/discarded signs and posts shall be salvaged to the County and delivered to the Public Works Division facility on US All existing mailboxes shall be relocated in accordance with the procedures outlined in FDOT Index No Relocation shall be considered a part of maintenance of traffic. 17. Driveway turnouts shall be constructed at all new and existing driveways per FDOT Index No. 515 and 516. All concrete aprons at the edge of the existing driving lane shall be removed prior to constructing the widened roadway or paved shoulder. Two foot feathering will be required at existing paved drives or roadways. Unpaved county roads are to be paved to the R/W line. 18. All materials not salvaged to the County or incorporated into the project shall be removed and lawfully disposed of off-site. Excess fill material shall be utilized to the fullest extent possible. Remaining fill shall be salvaged to the County at an approved location for stockpiling. Undamaged guardrail shall be salvaged to the County and delivered to the Public Works Division facility on US Type S or SP asphaltic concrete is to be placed with a mechanical spreader using electronic transverse & longitudinal screed controls. 20. Pavement thickness transitions along the mainline roadway are to be constructed on a 1:600 ratio. 21. Contractor s licensed Surveyor shall place all required PCP points in finished asphalt roadway after completion of construction. 22. All disturbed areas shall be stabilized by seeding, fertilizing, and mulching. Sodding is required on any slopes steeper than 3:1 per FDOT Index 500. (See typical roadway modification section for sod locations) F:\Engineering\Land Development Regulations\Development Construction Guidelines.doc Page 3 of 3

4 MAINTENANCE OF TRAFFIC 1. The Contractor shall be responsible for maintaining safe passage of traffic and protection of his work force throughout the project. 2. A maintenance of traffic plan shall be submitted by the Contractor in accordance with Part Six of the MUTCD and the FDOT Design standards. Unless specifically authorized, the Contractor shall maintain at all times at least one way traffic with a minimum of a 10' (ft) wide lane and a posted speed of not more than 25 miles per hour, with appropriate traffic control. Both lanes shall be opened to traffic during non-working hours. 3. Contractor is to check and maintain on a daily basis all signs, flashing lights, striping and other items as required to conform with the maintenance of traffic plan. 4. Work zone traffic control shall adhere strictly to the requirements of FDOT Design Standards, Index Series 600, the MUTCD and any specific instructions of the County. Noncompliance with these standards will serve as just cause for stopping work at no expense to the County. 5. The proposed sequence of operations and specific maintenance of traffic plans shall be reviewed and approved by the County Engineering Division prior to their implementation. 6. All above ground obstructions within the clear zone of temporary or permanent lanes shall be marked and protected in accordance with FDOT Standard Specifications or specific instructions of the County Engineering Division. 7. Temporary lanes shall be stabilized and suitable for all weather conditions.

5 EROSION AND SEDIMENTATION CONTROL The Contractor is responsible for erosion/sedimentation control practices during construction to minimize on-site erosion/sedimentation and to protect against damage to off site property. The following practices shall be employed: 1. The limits of disturbance for all aspects of development shall not extend beyond the limits of the property or right-of-way. 2. Erosion and sedimentation control shall be the responsibility of the Contractor. Areas of off-site discharge during construction shall be protected with a sediment barrier per FDOT Index 102 to prevent off-site discharge of sediments. 3. All perimeter control measures shall be installed prior to any excavation/filling, clearing and grubbing or site grading activities. 4. Temporary seed and mulch should be used to control on-site erosion when it is not practical to establish permanent vegetation and where disturbed areas will not be fine graded for periods of 14 days or more. 5. Mulch shall be applied at a rate of 1.5 ~ 2 bales per 1,000 ft2 or 1.5 ~ 2 tons per acre. 6. Straw bales shall be staked with two (2) 2 x 2 wooden stakes or two (2) #5 steel rebar w/ rubber caps. 7. Permanent vegetation shall be placed as early as possible on all slopes steeper than 5 (ft) horizontal to 1 (ft) vertical (if applicable). 8. Sod is required for all surfaces with slopes greater than 4 H:1V. Sod shall be installed perpendicular to the expected flow and pinned for slopes 3 H:1V or greater. 9. Permanent vegetative stabilization shall be applied on fine graded sites as soon as practical. Temporary seeding should be employed to prevent exposure of barren soils until permanent vegetation can be applied. 10. All erosion and sedimentation control measures shall be inspected weekly and after rain events. Control measures shall be maintained or modified at any point they cease to function properly or have an accumulated sediment height of 50%.

6 STORMWATER MANAGEMENT FACILITIES 1. All Storm Water Management Facilities shall be designed by a registered Professional Engineer and approved by the Suwannee River Water Management District or the Florida Department of Environmental Protection. 2. An approved copy of the application and permit shall be provided to the County for those developments that will be maintained by the County. 3. All Detention/Retention facilities shall be constructed with 4 H:1V minimum slopes and designed to allow for 6 minimum freeboard under all modeled 100 YR storms. 4. All slopes and berms of storm water management facilities shall be completely sodded. The tops of all pond berms shall be no less than five feet (5 ) wide with ten feet (10 ) preferred. 5. The maximum stage for storm water management facilities within thirty feet (30 ) of a roadway or parking area shall be no higher than 6 below the bottom of the proposed base (limerock) course. 6. Cross Drain and Side Drain culverts shall be 18 (or equivalent) x 30 minimum and constructed of RCP, CMP or CPP. Cover heights shall be per FDOT Index 205. Maximum length of culverts shall be forty-five feet (45 ) from opening-to-opening. 7. MES shall be constructed at a 4 H:1V slope. All sides of each Mitered End Section (MES) and Endwall shall receive a five (5) foot minimum sod strip. 8. All earthwork shall be constructed within 0.3 feet of plan grade. This tolerance is reduced to 0.1 ft for shoulders and roadways (FDOT Spec ). 9. All storm sewers and pipe culverts shall be laid within 1/16 per foot (not to exceed 1 ) of plan grade and alignment (FDOT Spec ). Box culverts shall be placed within 0.1 ft of plan alignment and grade (FDOT Spec ). 10. All drainage structures and any associated openings shall be constructed and placed within 0.02 feet (1/4 ) of plan grade and approved submittals (FDOT Stormwater Management Facility Handbook, 3.2.1). 11. Contractor shall provide the Public Works Division with a manual detailing all Operation and Maintenance requirements for storm water management facilities that will be maintained by the County.

7 SIGNAGE AND PAVEMENT MARKINGS 1. All required pavement markings shall meet the criteria of FDOT Section 709 "Traffic Stripes and Markings-Two Reactive Components" and FDOT Section 710 "Painting Traffic Stripes". 2. All proposed roadways shall be striped based on FDOT and MUTCD passing/no-passing criteria. Edge lines and RPMs will be required on Collector and Arterial Roads and those roads that have an ADT>1, Pavement Markings shall be as per FDOT Index Retro-reflective pavement markers shall be installed as per FDOT Index Sign brackets, columns, and foundations shall comply/be selected using FDOT Index 11860, 11862, and 11865, respectively. 6. Signage designated to be reused and relocated shall include furnishing new brackets, columns, and foundation. 7. Unless designated otherwise, all signs shall meet the size requirements for "Conventional Roads" per the MUTCD. 8. All intersections shall receive a minimum of a 24 stop bar, R1-1 Stop Sign, 50 feet of Centerline Striping and Street name and intersecting street name signage.

8 TESTING REQUIREMENTS 1. All testing shall be performed by a licensed/certified laboratory. Upon selection, the laboratory shall be approved in writing by the County prior to beginning any on-site testing or material collection. 2. Copies of all test results shall be provided to the County Engineering Division. Passing results will be required prior to beginning the next phase of construction. 3. The County Engineering Division shall be notified no less than 24 hours in advance for scheduling inspection of pertinent stages of construction including subgrade preparation, limerock placement, prime and tack coats, asphalt placement, culvert installations, concrete pours and others as required for approval. 4. Perform compaction testing for stabilized subgrade and fill the full depth at a frequency of one test per lift per 500 foot section, or at a minimum of two tests per roadway segment, whichever is greater. Compaction shall achieve 98.0% of Modified Proctor density (AASHTO T 180). 5. Perform Limerock Bearing Ratio (LBR) testing for stabilized subgrade at a frequency of four tests per lift per roadway mile, or at a minimum of two tests per roadway segment, whichever is greater. LBR value shall equal or exceed For widening only, perform LBR testing for stabilized subgrade at a frequency of one test per lift per roadway mile per side, or at a minimum of two tests per roadway segment, whichever is greater. 7. For widening only, perform LBR testing for limerock base course at a frequency of one test per lift per roadway mile per side, or at a minimum of two tests per roadway segment, whichever is greater. 8. Perform compaction testing for base course the full depth at a frequency of one test per lift per 500 foot section, or at a minimum of two tests per roadway segment, whichever is greater. Compaction shall achieve 98.0% of Modified Proctor density (AASHTO T 180). 9. In-place thickness of each course of a base course shall be determined using 3" cores at a frequency of one test per lift per 200 foot section, or at a minimum of two tests per roadway segment, whichever is greater. 10. Asphalt concrete mixes shall be a current FDOT approved design of the material actually used. Samples of materials delivered to the site shall be tested in accordance with FDOT requirements to verify that aggregate gradation and asphalt content meets approved design criteria. 11. Surface smoothness and in-place density of each course of asphalt concrete shall be determined in accordance with current FDOT Standard Specifications. Field densities, F:\Engineering\Land Development Regulations\Development Construction Guidelines.doc Page 1 of 2

9 coring locations and Plant Sampling shall be conducted and obtained according to the random number tables provided by the County. A minimum of three density tests per roadway segment per day and testing of one plant sample per day will be required. 12. Perform compaction testing for culverts and culvert extensions as described in Section 125, FDOT Specifications, latest edition. A minimum of one test on each side of the culvert per lift is required for the bedding and cover zone. A minimum of one test per lift is required in the top zone. Perform additional testing as directed by the authorized representative. F:\Engineering\Land Development Regulations\Development Construction Guidelines.doc Page 2 of 2

10 PROJECT CONSTRUCTION SEQUENCE A. Post all applicable permit placards. The permit placards shall not be nailed to trees. B. Construct, Install and Operate the approved Maintenance of Traffic. C. Flag or stake the proposed limits of clearing prior to demolition commencement. D. Construct tree barricades or fences around protected trees in the vicinity of any vehicular traffic or proposed construction areas. E. Designate vehicular pathways within the limits of the site. F. Designate employee parking areas, materials storage areas, and topsoil storage areas. G. Designate refueling areas away from the water bodies or watercourses onsite. H. Construct and install erosion and sedimentation control devices. Construct tree barricades continuous along limits of clearing except where silt fence defines limits. I. Secure approval to commence construction from County Representative. J. Clear and grub within limits of stormwater management facilities. K. Construct Stormwater Management Facilities (1 ft above proposed finish grade). L. Clear and grub balance of site within limits of clearing. M. In-fill areas, prepare suitable soils per geotechnical report and place in 8 max. lifts compacted per report. N. Construct utilities, internal storm drains, and sleeves for irrigation and electric, if required. O. Construct roadway subgrade and base. Upon completion the base shall be primed (and protected with sand cover or screenings if open to traffic) and the prime allowed to cure for a minimum of 24 hours before paving. P. Seed, fertilize and mulch all disturbed areas not paved or sodded with minimum 80% coverage of a perennial type ground cover within 90 days of planting. At least 75% coverage must be provided by a seasonal coverage within 30 days of planting. Q. Construct asphalt pavement layer(s). R. Install pavement striping and signs. S. Install all required PCP s in roadway centerline. T. When construction is complete, all unpaved areas shall be stabilized with vegetation consisting of either shrubs or grass.

11 PRE-PAVING REQUIREMENTS 1) Provide FDOT Approved Design Mix to Engineering Division for review and approval. 2) County Engineering Division will provide Random Number tables for Asphalt sampling based on contractor provided estimate of project tonnage. Asphalt delivery tickets shall have the following information: (a) Sequential load number (b) Project number (c) Date (d) Name and location of plant (e) Type of mix (f) Place for hand-recording mix temperature (g) Truck number (h) Gross, tare, and net weights (as applicable) (i) Accumulated total of mix (j) Tons (k) Mix temperature at time of loading (1 st five and 1 out of every 5 trucks) Materials/Equipment to be on-site at all times during paving operations: Independent Geotechnical personnel for samples and testing Temperature sensing devices (HMA thermometer and infrared device) Nuclear density gauge Coring Rig (6 bit) Spirit and Smart level 15 ft manual straight edge 15 ft rolling straight edge (calibrate on site) 30ft Asphalt Paving Machine ski Asphalt saw Broom tractor Blower MOT signage and equipment including: Stop/Slow paddles w/ operators to limit traffic to one direction Two-way radios or follow-me Truck (pilot vehicle) w/ operator Advance warning signage Traffic cones Safety vests for all personnel FDOT Index 606 acceptable MOT; FDOT Index 604 preferred MOT Please Sign and Return with proposed paving timeline. Paving Contractor/Developer Signature Company Date Note: These requirements may be modified based on project specifics.