Title 312500-Erosion Control.pdf ✅

EROSION & SEDIMENTATION CONTROLS 31 25 00 - 1 SECTION 31 25 00 - EROSION AND SEDIMENTATION CONTROLS PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General Requirements and Specific Requirements, apply to this Section. B. “Connecticut Guidelines for Soil Erosion and Sediment Control”, Connecticut Council on Soil and Water Conservation, May 2002, inclusive of all supplements and/or its latest revision or edition. 1.02 SECTION INCLUDES A. Hay bales, filter fabric fence, sediment barriers and sedimentation structures B. Temporary mulch C. Temporary sediment basins as required by field conditions 1.03 QUALITY ASSURANCE A. All erosion and sediment control measures will be constructed in accordance with the standards and specifications of the “Connecticut Guidelines for Soil Erosion and Sediment Control”. 1.04 PROJECT CONDITIONS A. Land disturbance will be kept to a minimum; re-stabilization will be scheduled as soon as possible. Temporary seeding or permanent hydro-seeding should take place immediately upon completion of grading. Permanent seeding will be scheduled during March 15 - June 15: August 15 - October 15. B. Erosion and sediment control measures will be installed prior to construction whenever possible and will be maintained in effective condition throughout the construction period. C. Hay bale filters will be installed at the base of all proposed slopes and on the downhill side of any area receiving new planting and as instructed by the Engineer. D. Additional control measures will be installed during the construction period as required by field conditions or as requested by the Engineer. E. Sediment removed from control structures will be disposed of on site in a manner approved by the Engineer. F. Mulch all new slopes 3% or greater. Use straw or hay (70-90 lbs. 1,000 sq. ft.), free of weeds or coarse matter. Chemical binder such as Petroset Terratack Hydro Mulch and Aerospray will be used as recommended by manufacturer to anchor mulch. Mulch must
EROSION & SEDIMENTATION CONTROLS 31 25 00 - 2 be inspected periodically, in particular, after rainstorms to check for rill erosion. Where erosion is severe, repair the eroded area and place additional mulch as required to control the erosion. Grasses shall not be considered established until a ground cover is achieved, which is mature enough to control soil erosion and to survive severe weather conditions. PART 2 - PRODUCTS 2.01 MATERIALS A. Hay bales: 1. Hay bales shall be made of hay with 40 lbs. minimum weight, and 120 lbs. maximum weight. The hay bales shall be sufficiently bound with either wire or nylon twine to resist breaking apart during their use, shipment or placement. 2. Stakes shall be wood, minimum two inches (2") by two inches (2") by three feet (3') long. Filter fabric: 3. Synthetic filter fabric shall be a pervious sheet of propylene, nylon, polyester or ethylene filaments and shall be certified by the manufacturer or supplier as conforming to the following requirements: Minimum Filtering Efficiency: 75% Minimum Tensile Strength at 20% Elongation for Extra Strength: 50 lbs./lin. in. for Regular Strength: 30 lbs./lin. in. Minimum Flow Rate: 0.3 gal./min./sq.ft. B. Temporary mulch: clean oat straw, wheat straw, timothy hay, a mixture of clover and timothy hay or other approved native or forage grasses; well-seasoned before bailing, free from mature seed-bearing stalks or roots of prohibited or noxious weeds. C. Crushed stone: crushed or broken stone conforming to the requirements of Section M.02.01-1 “Broken or Crushed Stone” of CTDOT Form 817. Gradation shall conform to No. 8 (1/4” stone) per Section M.01.01. PART 3 - EXECUTION 3.01 PREPARATION A. Conduct construction operations in compliance with all terms of regulation agency requirements, including requirements noted on the Contract Drawings. B. Retain all sediments within the contract limits, and within designated disposal areas. C. Install erosion control measures prior to beginning site disturbance. Maintain erosion control measures throughout construction period, install additional measures if necessary to retain all sediment on site. Install any additional erosion control measures which may be required by local regulatory officials.

EROSION & SEDIMENTATION CONTROLS 31 25 00 - 4 B. Crimp straw into soil by mechanical means. C. On all slopes 4:1 or steeper, anchor mulch with liquid tackifier applied uniformly at a rate of 60 gallons per acre. D. Protect buildings, paving, planting and all non-seeded areas from liquid tackifier over- spray. 3.04 INSPECTION AND MAINTENANCE E. General 1. Inspection shall be frequent, and shall be made after each storm event. Repair or replacement shall be made promptly as needed. F. Hay Bales 1. Cleanout of accumulated sediment behind the bales is necessary if 1⁄2 of the original height of the bales becomes filled with sediment. 2. Hay bales shall be replaced after their expected useful life of 60 days. 3. Bale barriers shall be removed when they have served their usefulness, but not before the upslope areas have been permanently stabilized and the completion of construction activities. G. Filter Fabric Fence 1. Fabric placed around grates shall be replaced whenever the fabric becomes torn, stretched or otherwise damaged so that it can no longer perform its function. H. Sedimentation Basins 1. Temporary sedimentation basins shall be cleaned-out once one-half of the basin volume becomes filled with sediment. END OF SECTION 31 25 00