Storm drain inlet protection. Wattles placed along the back of curb should be offset, as required to go around structures such as curb intakes that project

behind the back of curb. At these locations, the wattle should be placed behind the structure (not over it) and shaped to direct water around either side of the structure to prevent ponding. At area intake locations, a shallow trench should be constructed 1 to 2 feet away from the edge of the intake. The wattle should be placed in the trench and firmly staked in place.

4. Slope application. Wattles should be installed on the contour from the bottom of the slope upward.

5. Materials. Wattles can be made from straw, rice straw, coconut husk, or other approved material. The netting consists of biodegradable burlap or ultraviolet (UV) degradable plastic netting. Straw should be Certified Weed Free Forage, by a manufacturer whose principle business is wattle manufacturing. Coir (coconut fiber) can be in bristle and mattress form, and should be obtained from freshwater cured coconut husk.

6. Application. Wattles are available in a variety of diameters ranging from 9 inches to 20 inches. The most common sizes are 9 and 12-inch wattles. The allowable spacing for these diameters shall be, as follows:

Slope Spacing Intervals (ft)

9” Diameter 12” Diameter

<4:1 20 40

2:1 to 4:1 15 30

2:1 or greater 10 20

7. For soft, loamy soils, the spacing interval should be decreased. For hard, rocky soils, the spacing interval may be increased.

8. For highly erosive soils, and for slopes 2:1 or greater, an additional row of wooden stakes should be provided on the downhill side of the wattle.

9. Maintenance. Repair or replace split, torn, unraveling or slumping wattles. If the wattle is used as a sediment capture device, or as an erosion control device to maintain sheet flows, sediment that accumulates in the wattle must be periodically removed when accumulation reaches one-half the designated sediment storage depth, usually one-half the distance between the top of the fiber roll and the adjacent ground in order to maintain effectiveness. If wattles are used for reduction of slope length, sediment removal should not be required as long as the system continues to control the grade. Additional sediment control practices are required to be used in conjunction with this type of application.

3.05 PIT/TRENCH DEWATERING

A. Water removed from open pits and/or trenches shall have silt removed prior to leaving the immediate site of construction. Silt shall be removed by natural vegetation, a straw bale trench dewatering inlet device, settling pond, filter bag, a rock/geotextile fabric sediment trap/basin, or other appropriate sediment control measure. Water filtered through a basin shall not violate any water quality standard and shall have efficient sediment/silt removal prior to discharging to a waterbody.

B. Contractor shall be responsible for providing adequate number of pumps for prompt and efficient dewatering. Ends of discharge hoses shall be provided with flow dispersion and filtration devices to prevent scouring of surface soils, discharge of turbid water, and/or washout of stream banks. Discharges from dewatering activities shall not be conveyed into or upon any roadside ditch, curb and gutter, street or publicly used thoroughfare.

C. The direct discharge of silty/muddy water to a stream is strictly prohibited.

D. The direct discharge of silty/muddy water off of the project site is strictly prohibited.

E. The direct discharge across areas of equipment access points and/or construction haul roads is strictly prohibited.

F. Contractor is solely responsible for adequate maintenance of dewatering filtration and sedimentation structures to assure they are working in an efficient manner.

3.06 OTHER CONTROLS

A. A dedicated concrete truck wash out area shall be maintained to include adequate containment to prevent runoff of concrete truck wash water. Concrete truck drivers shall be notified to use wash out area.

B. Contractor shall follow the appropriate waste storage and disposal practices, as per applicable environmental regulatory requirements. Solid waste dumpsters/roll-offs, or other appropriate waste receptacles will be maintained and used at the site. Good housekeeping practices will preclude trash, construction wastes, and debris to be dumped or scattered on the construction site. There shall be no open burning of any waste material. No solid materials, including building materials, shall be discharged to waters of the State.

C. No liquid waste chemicals, fuels, and/or oils are to be leaked or spilled on ground surfaces. Bulk storage of liquid chemical wastes will be provided with secondary containment with a capacity sufficient to contain the volume of the largest container within the secondary containment. All waste materials shall be stored in a manner to prevent releases and should be disposed of by a qualified waste disposal firm at an acceptable waste disposal facility. Records of the disposal of all solid, hazardous, non-hazardous, and liquid wastes are to be maintained by the Contractor. Contractor shall notify the Engineer of any spills or leaks that occur in spite of the preventive measures taken. Contractor will prepare a report of any spills or leaks in accordance with the reporting and recordkeeping measures described in the BMPs. No contaminants from fuel storage areas, hazardous waste storage and truck wash areas shall be discharged to waters of the State. These areas should not be located near a water body, if there is a water body on or near the project.

D. Contractor shall maintain compliance with applicable State and/or local sanitary sewer, septic system, and waste disposal regulations.

E. Used and/or waste oil generated from equipment maintenance is exempt from the hazardous waste rules, as long as it is transported offsite to be recycled/reused.

Contractor shall be responsible for disposal of waste oils, fuels, and fluids at a recycling/reuse facility and shall provide written documentation of the final waste disposal method and facility location, including EPA identification number of transporter and disposal facility to the Engineer.

F. Off-site vehicle tracking of sediments and the generation of dust must be minimized. Measures such as stone at construction access points, parking areas, and unpaved roads that carry significant amounts of traffic (e.g. more than 25 vehicles per day), providing entrance wash racks or stations for trucks, and/or street sweeping shall be implemented where appropriate. Application of water to construction haul roads should be done, as appropriate, to control dust generation.

3.07 PERMANENT EROSION CONTROL

A. The Contractor shall incorporate permanent erosion control features into the project at the earliest practicable time as the construction progresses all in accordance with the City or State "Erosion Control Standards", and the following as necessary: