Sierra Pacific Industries 8/16/2020

CITY OF EVERETT CHAPLAIN BRIDGE INSTALLATION DETAILS,SPECIFICATIONS,AND REQUIREMENTS to remove any water that enters the coffer dam. The sediment-laden water shall be pumped to an upland area where the sediment will settle out before the water re-enters the stream. The site shall be monitored to ensure fish do not re-enter the work area. Water shall be diverted to the new channel to passively bypass the work site. Upon completion of the bridge installation,the coffer dam shall be carefully removed to allow water to begin flowing under the bridge. This procedure shall be done slowly to prevent turbidity. Then the bypass channel shall be restored to its former condition. Method 4: Active pumping to divert water around work area In this method pumps shall be used to actively bypass around the work site. A coffer dam shall be installed around the crossing to restrict water from entering the work site. Seines,minnow traps,dip nets,fish herding,or other approved fish exclusion methods shall be used to safely remove fish from the work area. A pump shall be placed in the work area to remove any water that enters the coffer darn. The sediment- laden water shall be pumped to an upland area where the sediment will settle out before the water re-enters the stream. The site shall be monitored to ensure fish do not re-enter the work area. One or two additional pumps shall be used to divert water around the work site during construction;the number of pumps will depend on water levels at time of installation. An additional pump shall be placed on standby in case one of the pumps stops working;this results in a total of three to four pumps for the project. Upon completion of the bridge installation the coffer dam shall be slowly removed to prevent turbidity. The bridge installation is expected to take two days. Method 5: If the contractor proposes an alternative method not listed above,the City shall discuss the proposed method with DNR to determine if it is an acceptable alternative that meets water quality and fish habitat protection objectives. Concrete disposal: For all the above methods,concrete removed from the existing six-barrel crossing shall not be used for streambed restoration material. Concrete waste material shall be removed from City of Everett ownership.