Section 237 Section 237
237.02 Materials . Wattles used around inlets shall have a diameter of twelve inches
(12”) and a length adequate to meet field conditions. Wattles used at other locations shall have a diameter of twenty inches (20”) and a length adequate to meet field conditions. The minimum diameter for the above wattle sizes shall be one inch (1”) less than the specified diameter. The stakes used in securing the wattles in place shall be placed appr oximately three feet (3’) apart throughout the length of the wattle. Stakes shall be wooden and of adequate size to stabilize the wattles to the satisfaction of the Engineer. Wattles shall be one from the Department’s APL.
237.03 Construction Requirements .
237.03.1 General. The wattles shall be constructed at the locations and according to the
requirements shown on the erosion control plan. 237.03.2--Maintenance and Removal . The Contractor shall maintain the wattles and remove and dispose of silt accumulations. When the wattles are no longer needed, they shall be removed and the Contractor shall dispose of silt accumulations and treat the dist urbed areas in accordance with the contract requirements.
237.04 Method of Measurement . Wattles of the size specified will be measured per
linear foot.
237.05 Basis of Payment . Wattles, measured as prescrib ed above, will be paid for at
the contract unit price per linear foot, wh ich price shall be full compensation for installation, maintaining and removal of the wattles, the removal and disposal of silt accumulations and any required rest oration of the disturbed areas. Payment will be made under: 237-A: Wattles, Size - per linear foot SECTION 239 - TEMPORARY SLOPE DRAINS
239.01 Description. This work consists of furnishing materials for, constructing and
maintaining temporary slope drains, to include berms, pipe and riprap, as directed by the Engineer in accordance with the requirements shown on the plans and these specifications to control soil erosion and water pollution. Also, the work includes removing and disposing of the temporary slope drains. This temporary erosion control provision shall be coordinated with the permanent erosion control features to assure economical, e ffective and continuous erosion control throughout the construction period. Measurement and payment for temporary slope drains will be made only when a pay item is included in the bid schedule of the propo sal. The quantity is estimated for bidding purposes only and may vary depending upon actual construction requirements.
239.02 Materials. The temporary shoulder berm may be constructed from embankment
material. The temporary pipe shall be 8-inch minimum diameter and leak proof. The temporary riprap shall be hard, durable stones or broken concrete, angular in shape and shall be of sufficient size to prevent scour where installed.
239.03 Construction Requirements. Temporary slope drains shall be constructed at
the intervals and locations designated or deemed appropriate by the Contractor and approved by the Engineer for channeling runoff waters down embankment slopes and according to the requirement s shown on the plans. Slope drains shall be adequately anchored to the slopes and their outlets constructed or placed to prevent erosion. Berms may be constructed from embankment material using the heel of a motor grader, bulldozer blade or other approved equipment and compacted using the wheels or tracks of same equipment. Riprap shall be placed in ac cordance with the plans where the pipe outlet location is subject to scour. The riprap may be end dumped. Pipe shall be placed in accordance with the plans and extended as required to coincide with the height of embankment by the end of each work day. Prior to the suspension of grading operatio ns each day, the Contractor shall shape the earthwork in a manner that will direct storm water runoff to the temporary slope drain installations. The temporary slope drains shall be operated and maintained by the Contractor in an acceptable functional condition until the slopes are protected with permanent erosion control measures. When the temporary erosion and pollution control installations are no longer required, the Contractor shall remove and dispose of all materials and restore the areas by establishing growth and coverage of vegetative items as required for the remainder of the project.
239.04 Method of Measurement. Temporary slope drains will be measured by the
linear foot of temporary pipe, which includes berms, riprap, and pipe including elbows or special sections. Measurement shall be alo ng the line and grade of the pipe installation from end to end along the centerline of the pipe installed and accepted. Temporary shoulder berms and temporary riprap will not be measured for separate payment. Their costs shall be included in the per linear foot price bid for temporary slope drains.
239.05 Basis of Payment . Temporary slope drains, measur ed as prescribed above, will
be paid for at the contract unit price per linear foot, which price shall be full compensation for completing and maintaining the work and for the removal and disposal of, when no longer required, all items comprising the temporary slope drains. Payment will be made under: 239-A: Temporary Slope Drains - per linear foot SECTION 245 - SILT DIKE
245.01 Description . This work consists of furnis hing, installing, maintaining and
removing temporary silt dikes. Silt dikes shall be used for velocity reduction of stormwater run-off. Silt dikes shall be considered to have “minimal” capabilities for sediment filtration of stormw ater run-off. With the ex ception of placement along the ends and edges of a construction bridge across a Water of the U.S., silt dikes shall not be used as a discharge structure or the last sediment control item in a “BMP train” prior to stormwater discharge off Department Right-of-Way or into Waters of the U.S.
245.02 Materials. Silt dikes shall have a dike height of at least nine inches (9”) in the
center. The outer cover shall be a woven ge otextile fabric placed around the inner plane and allowed to extend beyond at least one side of the device for a minimum of two feet (2’) to form an apron. The device may also have aprons on both sides, each of which shall extend from the device a minimum of two feet (2’). In the event that the silt dike has an apron extending from only one side, geotextile fabric shall be placed under the silt dike as shown on the standard drawing. Silt dikes shall rebound to their originally installed height when driven over by vehicles or equipment. Silt dikes shall not be damaged when driven over by vehicles or equipment. The silt dike shall also be one listed on the Department’s APL.
245.03 Construction Requirements. The flexibility of the materials in silt dikes allows
them to conform to various channel configurations. The dikes shall be attached to the ground with wire staples. The staples shall be No. 11 gauge wire and be at least six inches long. As a minimum, the staples shall be placed as recommended by the manufacture. Prior to placement of the silt dikes, the Cont ractor shall make sure the surface on which the dike is to be placed is flat. The silt di kes shall be placed in ditch, keeping excess fabric extended up and downstream of the dam. Excess material shall be trenched into the ground on the upstream end and stapled on the downstream end. A minimum 6-inch overlap between end sections shall be required should the width require multiple silt dikes to be installed. The overlapped end se ctions shall be connected with wire wraps or staples every 12 inches on center. The dike aprons shall be entren ched at the upstream side and anchored to the ground at downstream end using staples. This device can be used on surfaces that do not allow for trenching by securing the aprons with sand or gravel bags or other manner as described by the manufacturer. The device can be easily removed for maintenance and is considered to be reusable. Silt dikes which do not