Exhibit E Aquatic Provisions.pdf

JEFFERSON BRIDGE FOUNDATION SCOUR REPAIR PROJECT

Olympic National Forest Service Hood Canal Ranger District

Jefferson County, Washington

Solicitation AG-05G2-S-12-0030 Part III Section J., J.13 – Project Drawings / Exhibits (Separate Attachments)

EXHIBIT E

AQUATIC PROVISIONS

July 23, 2012

Timing

1. In-water work shall not begin prior to August 1, 2012 and must be completed no later than

September 30, 2012 unless the contract requires completion by an earlier date. An expedited construction schedule may be needed to finish instream work by the required completion date.

Note: These aquatic provisions contain requirements for pile driving and sheet-piling installation.

Reference to these activities in the provisions does not imply or indicate that they are acceptable activities or possible repair options for this site. Refer to amended C.1, Scope of Contract, for additional requirements regarding the installation of piling and/or sheet-piling.

Project Area Monitoring/ Dewatering Project Area Monitoring for this project is defined as providing a schedule (and any schedule updates) and monitoring of sensitive construction activities that could produce noise, shock waves (pile driving), increase stream turbidity or have the potential of releasing contaminants into the stream (i.e.:

pile driving, excavation, hydro-excavation, grouting and non-permeable grout-filled bag placement.

Dewatering for this project is defined as providing a dewatered area in the immediate vicinity of the construction (prior to excavation and backfill requiring dewatering) including maintaining fish passage and maintaining a schedule to allow periodic Project Area Monitoring for fish in the vicinity in coordination with the Contracting Officer. This could include installing an approved diversion.

Site Isolation for this project is defined as providing an isolated area of construction where turbid water is separated from the live stream by a non-permeable barrier and adequate pumping and treatment of any turbid water outside of the live stream. Fish passage at the crossing will be maintained. Treat sediment-laden water created in an isolated dewatering area per Number 4 of the Erosion and Wastewater Control section below.

1. Cofferdams of either pea-gravel or sand-filled bags, bladder dams, sheet piles or with another approved method will be used to create a dewatered or isolation proposed in-water work area.

2. The cofferdam will be designed and installed to withstand all stream flows anticipated during the construction period after its installation.

3. The cofferdam will minimize constriction in the width of the active channel to maintain flow and fish access to upstream and downstream areas.

4. Prior to completing the last portion of the cofferdam, the Forest Service will attempt to remove fish out of the work area.

5. After completing the cofferdam and prior to dewatering the site or commencing in-water construction, any fish remaining in the work area will be captured by a combination of snorkeling, seining, minnow trapping, and electro-fishing and safely moved from the job site. If fish are present, the Forest Service will provide fish removal during Monitoring and Dewatering.

6. Equip any pump used for dewatering the construction area with a fish guard, to prevent passage of fish into the pump, with a screen of 3/32 inch or smaller mesh. Note that screening the pump intake will substantially reduce the capacity of the pump unless the size of the intake is increased.

7. Any materials used to construct the cofferdam will be removed prior to the completion of the project except where approved by the Contracting Officer (i.e.: acceptable part of the structural foundation repair that does not obstruct the stream).

Scour Repair Protection

1. Design and propose scour protection to protect the installed scour repair to minimize constriction of the active channel width and the active channel cross section under the bridge.

2. Propose protection material that is clean, angular rock installed to withstand 100-year peak flows.

3. Limit proposed placement of channel and bank protection material within the “original” bankfull channel and the “foundation and scour zone” to the minimum amount necessary to achieve project objective of repairing and protecting the bridge foundation support.

Pile Driving

1. Utilize vibratory pile driving rather than impact hammer driving whenever possible. A combination of vibratory driving and impact driving may be required to place an individual piling.

2. Isolation of the in-water work area is not required for driving sheet pile, if possible and allowed.

3. Prior to beginning pile driving in uncontained in-water work areas, the area will be snorkeled and fish will be chased from the immediate area to the extent possible. Additional periodic fish removal efforts may be needed throughout the duration of the pile driving activities.

4. The Forest Service will provide fish monitoring and removal during approved pile driving activities in uncontained in-stream areas.

Filling Stream Channel within Construction Area

1. If fill is placed within the coffered construction area to provide a flat work surface for equipment, all fill will be removed prior completion of in-water work and the streambed will be restored to the previously existing contours as much as possible.

Stream Crossings with Equipment

1. A single heavy equipment crossing of the Jefferson Creek channel shall be allowed for construction equipment to access the site. This may include multiple pieces of heavy equipment, if necessary. Each piece of equipment will be limited to a single crossing.

2. Wheeled vehicles will not be allowed to cross the stream channel.

3. NO equipment is allowed on the bridge.

Heavy Equipment

1. Used biodegradable or non-toxic hydraulic fluid in any heavy equipment used for this project.

2. Minimize operation of heavy equipment within the bankfull channel in streams and below the ordinary high water line to the extent practicable.

3. Remove accumulations of soil or debris from drive mechanisms (wheels, tires, tracks, etc.) and undercarriage of all heavy equipment prior to its working within the project area. (See equipment cleaning provision in the specifications.)

4. To prevent contamination, equipment shall be free of external petroleum-based products. Check equipment daily for leaks and complete any necessary repairs prior to commencing work activities. Fuel and perform any maintenance involving petroleum products on all machinery at a sufficient distance from stream channels, water bodies, or wetlands to prevent delivery of potential contaminants. Furnish spill containment equipment and material on site.

Erosion and Wastewater Control

1. Minimize alteration or disturbance of the bed, banks, and bank vegetation of water bodies and limit it to that necessary to construct the project.

2. Use erosion prevention and control methods as necessary during and immediately after project implementation to minimize loss or displacement of soils and to prevent delivery of sediment into waterbody. These may include, but are not limited to, operational techniques, straw bales, silt fencing, erosion control blankets, temporary sediment ponds, and/or immediate mulching of exposed areas. Protect ground disturbed by the project, with the potential to deliver sediment into water bodies, from surface erosion by seeding, mulching, or other methods prior to the fall rainy season.

3. After project completion, revegetate disturbed streambanks with site-appropriate vegetation to maintain soil stability.

4. Route wastewater from project activities to an area above the ordinary high water line to allow removal of fine sediment and other contaminants prior to infiltrating back into surface waters.

Sediment-laden water may need to be treated prior to release to prevent and minimize the likelihood of sediment discharge to surface waters.

Concrete and Grout

1. Do not allow fresh concrete or grout, concrete by-products, or other chemical contaminants to directly enter water bodies. Sufficiently cure structures containing concrete to prevent leaching prior to contact with the waterbody.

2. Use of treated wood is not permitted on this hydraulic project.