TECHSPECS_W912EF25BA001_amd0003.pdf

Little Goose Stilling Basin Sediment Removal W912EF25BA001 amd 0003

PROJECT TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

01 00 00.00 28 GENERAL REQUIREMENTS

01 11 01.00 28 SUPPLEMENTARY REQUIREMENTS

01 14 00.10 28 PROJECT SITE RESTRICTIONS

01 14 00.90 28 INTEGRATING ANTITERRORISM (AT) AND OPERATIONS SECURITY

(OPSEC)

01 22 00.00 28 MEASUREMENT AND PAYMENT

01 32 16.00 28 SMALL PROJECT CONSTRUCTION PROGRESS SCHEDULES

01 33 00 SUBMITTAL PROCEDURES

01 35 10.00 28 DIVING (GENERAL)

01 35 29.10 28 GOVERNMENTAL SAFETY REQUIREMENTS

01 42 00 SOURCES FOR REFERENCE PUBLICATIONS

01 45 00.00 28 CONTRACTOR QUALITY CONTROL

01 45 01.00 28 RESIDENT MANAGEMENT SYSTEM CONTRACTOR MODE (RMS CM)

01 51 00.00 28 TEMPORARY UTILITIES

01 55 10.00 28 CONTRACTOR WORK, ACCESS AND STORAGE AREAS

01 57 13.10 28 WATER QUALITY MONITORING

01 57 20.00 28 ENVIRONMENTAL PROTECTION

01 78 00.00 28 CLOSEOUT SUBMITTALS

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

35 01 50.59 28 DREDGING AND DIVING WORK

35 20 23.13 28 NATIONAL DREDGING QUALITY MANAGEMENT PROGRAM SCOW -

MONITORING PROFILE

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SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 14 00.10 28

PROJECT SITE RESTRICTIONS

PART 1 GENERAL

1.1 REFERENCES

1.2 SITE CONDITIONS AND OPERATIONAL RESTRICTIONS

1.3 LITTLE GOOSE PROJECT SECURITY

1.3.1 Contractor Vehicle Access

1.3.2 Identification of Employees

1.4 DELIVERY OF EQUIPMENT

1.5 BOAT RESTRICTED ZONE POLICY (BRZ)

1.6 FACILITY OCCUPANCY CLOSURE

1.7 WORK SCHEDULES

1.7.1 Contractor's Work Schedule

1.7.2 Government's Work Schedule

1.8 USE OF WALLA WALLA DISTRICT PARKS

PART 2 PRODUCTS (Not Used)

PART 3 EXECUTION (Not Used)

ATTACHMENTS:

Security Badge Form

Boat Restricted Zone (BRZ) Policy

-- End of Section Table of Contents --

SECTION 01 14 00.10 28 Page 1

SECTION 01 14 00.10 28 Page 2

SECTION 01 14 00.10 28

PROJECT SITE RESTRICTIONS

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by the basic designation only.

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 (2024) Safety -- Safety and Health Requirements Manual

Contractor shall be responsible for complying with the current edition and all changes posted on the web as of the effective date of this solicitation.

1.2 SITE CONDITIONS AND OPERATIONAL RESTRICTIONS

1. Work on this project will occur during the work window identified in Contract Clause 52.211-10 COMMENCEMENT, PROSECUTION AND COMPLETION OF WORK (1984).

2. The Navigation Lock Outage Work Window at Little Goose Dam commences as specified in Clause 52.211-10. Navigation Locks will remain unavailable to waterborne traffic until the end of the lock outage.

3. The Contractor is required to coordinate with the Control Room for site access outside of the Government's Typical Work Schedule listed below.

4. Contractor floating plant(s) must be clear of the BRZ during the Contractor's non-work hours any time there are not sufficient personnel onsite to facilitate its movement.

5. The Contractor is authorized to use the Fish Facility Barge Dock to moor their floating plant(s) and small craft and to use for land access.

1.3 LITTLE GOOSE PROJECT SECURITY

The Project site is a secured area and access onto the Project is restricted. The security measures affect all of the Contractor's vehicles and personnel. There will be delays when entering Projects due to locked gates, vehicle inspections, and personnel checks. Inspections and checks may include inspection of tool boxes, brief cases, lunch boxes, and other containers.

1.3.1 Contractor Vehicle Access

Project access roads on both sides of the dams are secured with locked gates. All vehicles that pass through the locked gates will be subject to being searched. No privately owned vehicles (POV's) will be allowed

SECTION 01 14 00.10 28 Page 3

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Line through locked gates. Only Contractor's work vehicles and equipment that are essential to the conduct of the work will be allowed in the work areas. All Contractor vehicles shall display suitable permanent or temporary identification.

1.3.2 Identification of Employees

Government Project personnel will provide the Contractor's personnel with identification badges as they arrive on site. The Contractor shall be responsible for furnishing the Security Badge Form(attached to the end of this SECTION) and initial identification (driver's license) for each employee five (5) business days prior to the employee arriving to work on the Project site, and upon issuance of official badges, for requiring each employee engaged on the work to display identification at all times.

Ensure each employee's full name with middle initial is included with the initial identification. All prescribed identification shall immediately be delivered to the Quality Assurance Representative for cancellation upon the release of the employee or project completion. If required by the Contracting Officer, employees will be photographed by the Government.

Employees who fail to submit to being photographed will not be allowed on the project site.

Every Contractor employee (prime or subcontractor) shall have a hard hat meeting the requirements of EM 385-1-1 . Hardhats shall display the Prime Contractor name, subcontractor name, and the employee's name. Contractor employee hardhats shall not be white with red markings. It shall be the responsibility of the Project Superintendent to enforce this requirement.

1.4 DELIVERY OF EQUIPMENT

Contractor shall be responsible for delivery and receipt of all materials and equipment. Government personnel will not be available to assist the Contractor in these activities. To the maximum extent possible, deliveries shall arrive on the same side of the river as the Contractor's work area. Delivery vehicles will be allowed to cross the river over the dam only with Government approval. Delivery vehicles arriving on the opposite side of the river as the work area shall be unloaded outside the locked gate, equipment shall be loaded onto Contractor's vehicles, and Contractor's vehicles will then be allowed to cross the dam to the work area.

1.5 BOAT RESTRICTED ZONE POLICY (BRZ)

The Boat Restricted Zone (BRZ) Policy is attached at the end of this SECTION. BRZ location is detailed in the GENERAL Section of the Drawings .

Check with the Contracting Officer for BRZ policy updates prior to the Pre-Construction Meeting.

1.6 FACILITY OCCUPANCY CLOSURE

Streets, walks, and other facilities occupied and used by the Government shall not be closed or obstructed without written permission from the Contracting Officer.

1.7 WORK SCHEDULES

1.7.1 Contractor's Work Schedule

At the Pre-Work Meeting, furnish a schedule of number of working days per

SECTION 01 14 00.10 28 Page 4 week, shifts per day, and hours per shift for contract work. Furnish notification of any change of schedule of regular work hours, overtime work hours, and shifts of work crews and personnel at the site. This notification shall be provided a minimum of 48 hours prior to any schedule change to allow suitable scheduling of Government personnel and inspection. Exception to this requirement may be allowed in case of schedule change due to emergency conditions.

1.7.2 Government's Work Schedule

a. The maintenance crews at the dam work from 6:30 a.m. to 5:00 p.m., Monday through Thursday. Crews and staff do not work on weekends and Federal holidays. If a Federal holiday falls on a Friday, the crews and staff do not work on the preceding Thursday. A powerhouse operator is at the site 24 hours a day, 7 days a week, including Federal holidays but is not available to assist the Contractor.

b. If the Contractor requires Government support or assistance outside of normal work hours, the Contractor must make a formal written request to the Contracting Officer at least one week prior to the date that support/assistance is needed. The Government will review this request, but there is no guarantee that Government support or assistance can be provided.

1.8 USE OF WALLA WALLA DISTRICT PARKS

Special consideration for the use of the Walla Walla District Camping Grounds will not be given to the Contractor if camping at these sites.

The Contractor's crew may not use Government parking lots near the Little Goose Lock and Dam for RV parking.

PART 2 PRODUCTS (Not Used)

PART 3 EXECUTION (Not Used) -- End of Section --

SECTION 01 14 00.10 28 Page 5

SECTION 01 14 00.10 28 Page 6

SECTION TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

SECTION 01 57 13.10 28

WATER QUALITY MONITORING

PART 1 GENERAL

1.1 DESCRIPTION OF WORK

1.2 REFERENCES

1.3 SUBMITTALS

1.4 WATER QUALITY MONITORING PLAN

1.5 QUALIFICATIONS

1.6 WATER QUALITY PARAMETERS

PART 2 PRODUCTS

2.1 WATER QUALITY MONITORING EQUIPMENT

2.1.1 Sondes

2.1.2 Computers

2.1.3 Data Collection Platforms (DCP) and Data Transmission Systems

2.1.3.1 Data Collection Platform (DCP)

2.1.3.2 Data Transmission Telemetry Systems

2.1.3.2.1 Satellite/Cellular Telephone

2.1.3.3 Global Positioning System (GPS) Units

2.1.4 Floating Platforms

PART 3 EXECUTION

3.1 MONITORING AND REPORTING

3.1.1 Monitoring

3.1.2 Types of Stations

3.1.3 Sampling Locations and Depths

3.1.3.1 All Dredging and In-Water Disposal Areas

3.1.4 Sampling Timing

3.1.5 Parameters Monitored

3.1.6 Equipment Calibration

3.1.7 Pre-dredging Monitoring System Test

3.1.8 Data Reporting

3.2 TURBIDITY

3.2.1 Turbidity Limits

3.2.2 Adjustments to Dredging and Disposal Operations

3.2.2.1 Active Dredging Sites

3.2.2.1.1 Early Warning Station

3.2.2.1.2 Compliance Station

3.2.2.2 In-Water Disposal Site

3.2.2.2.1 In-Water Disposal

3.2.3 Failure to Comply

3.3 WATER QUALITY MONITORING REPORT

3.3.1 Electronic Files

3.3.2 Database

SECTION 01 57 13.10 28 Page 1

ATTACHMENTS:

Figures 1 and 2

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SECTION 01 57 13.10 28 Page 2

SECTION 01 57 13.10 28

WATER QUALITY MONITORING

PART 1 GENERAL

1.1 DESCRIPTION OF WORK

This section specifies the requirements for water quality monitoring including preparation of a water quality monitoring plan, sampling and testing, notification of exceedance of action levels, and preparation of a final report. Water quality monitoring shall be performed before, during, and after all in-river work at each dredging site and at the in-water disposal site. Any changes to this plan shall be reviewed and approved by the Washington State Department of Ecology (Ecology) prior to the commencement of in-water work.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

WASHINGTON ADMINISTRATIVE CODE (WAC)

Chapter

173-201A WAC (2022) Water Quality Standards for Surface Waters of the State of Washington location: https://app.leg.wa.gov/WAC/default.aspx?cite=173-201A&full=true

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals having an "I" designation are for information only. A designation following the "G" or "I" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with SECTION 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

Water Quality Monitoring Plan ; G PEC

SD-06 Test Reports

Equipment Calibration ; G PEC

Water Quality Monitoring Report ; I PEC

Electronic Files ; I PEC

Database ; I PEC

SECTION 01 57 13.10 28 Page 3

1.4 WATER QUALITY MONITORING PLAN

Prior to commencement of any in-river dredging or disposal operations, the Contractor shall submit draft and final Water Quality Monitoring Plans to the Corps and the Washington State Department of Ecology and receive approval of a Water Quality Monitoring Plan prior to a pre-dredging meetin, as required by Section 401 certification conditions. The Plan shall be consistent with USACE's Joint Aquatic Resource Permit Application (JAPRA) and include, at a minimum, the following:

a. Resume for each employee including a detailed description of their qualifications to perform water quality monitoring.

b. List of all equipment and materials to be used.

c. Manufacturer's specifications for each piece of equipment to be used.

d. Calibration history for each piece of equipment.

e. Detailed narrative of activities proposed for performance of water quality monitoring including, but not limited to, field methods used for sonde calibration, in-vitro turbidity, DCP programming, data transmission and display, and structure of proposed database.

f. Best Management Practices (BMPs) proposed for response to early warning point elevations in PART 3 EXECUTION Paragraph "Early Warning Station" and exceedances at the point of compliance in Paragraph "Compliance Station".

1.5 QUALIFICATIONS

Water quality monitoring personal shall have a minimum of 3 years of experience in water quality monitoring for the parameters specified using equipment and methods that meet the requirements of this specification.

Additionally, they shall have experience installing real-time data acquisition systems that use satellite/cellphone telemetry.

1.6 WATER QUALITY PARAMETERS

Water quality monitoring shall be performed for the following parameters:

a. Turbidity (nephelometric turbidity units, NTU).

b. Total suspended solids (mg/L).

PART 2 PRODUCTS

2.1 WATER QUALITY MONITORING EQUIPMENT

Water quality monitoring equipment, listed below, shall be furnished and maintained by the Contractor and shall be used for monitoring of all dredging and disposal activities. The Contractor shall replace any non-functioning equipment within twenty four (24) hours.

2.1.1 Sondes

The Contractor shall provide multiparameter probes (sondes), as required, with access to a minimum of two (2) spares, meeting the following

SECTION 01 57 13.10 28 Page 4 requirements:

a. A depth sensor to measure exact position in the water column. The sensor shall have a range of between 0 meters (0 feet) and to one hundred (100) meters (three hundred twenty eight (328) feet) with a resolution of 0.01 meters (0.03 feet) and a minimum accuracy of ± 0.05 meters (0.164 feet).

b. A self-cleaning turbidity sensor with an accuracy of at least ±1% up to 100 NTU, ±3% from 100-400 NTU, ± 5% from 400-3,000 NTU.

Turbidimeter shall be resistant to shock and weather and shall be reliable and accurate under adverse field conditions.

c. Internal memory sufficient to store 10 days of sensor readings at 15-minute intervals.

d. Weighted sensor guard sufficient to hold the sonde and cable vertical and protect the sensors from direct contact with objects larger than 3/4-inch diameter.

2.1.2 Computers

Laptop computers or tablets for instrument set-up, calibration, and manual downloading if necessary. The computers shall be suitable for use under adverse field conditions (i.e., weather and shock resistant, a display that is visible in full sunlight) with an appropriate electronic interface to connect to monitoring equipment.

2.1.3 Data Collection Platforms (DCP) and Data Transmission Systems

Data collection platforms (DCPs) and real-time data transmission sets (with access to 2 spare sets) for each monitoring station are required.

2.1.3.1 Data Collection Platform (DCP)

The minimum specifications for the DCPs are:

a. The DCP shall have a minimum of two (2) SDI-12 address channels. Each DCP shall be connected to two (2) sondes and each sonde shall have its own individual data cable.

b. DCPs shall have processors that meet or exceed federal SDI-12 standards.

c. The data logger shall have sufficient memory to store ten days of measurements recorded at fifteen (15) minute intervals.

d. The Contractor shall provide a source of electrical power to the DCPs. Possible power sources are solar panels or batteries. The Contractor shall be responsible for maintaining the power source. The power source must also be capable of supporting the telemetry system required by paragraph: Data Transmission Telemetry Systems.

e. Serial port communication (e.g., RS486 and RS232) can be used in lieu of SDI-12 if the Contractor can show it effectively provides the communication capability that would be provided by SDI-12 for the Water Quality Monitoring application.

SECTION 01 57 13.10 28 Page 5

2.1.3.2 Data Transmission Telemetry Systems

Data shall be transmitted every fifteen (15) minutes using a commercially available transmission system selected by the Contractor. The Contractor shall maintain and operate the web site and shall ensure it is updated on a 15 minute basis.

2.1.3.2.1 Satellite/Cellular Telephone

A satellite/cellular telephone, or conventional cellular telephone (if coverage is available) data transmission system may be used to transmit data to a central location. The phones shall be FCC data compliant. The Contractor shall be responsible for all air time and use-costs associated with obtaining and transmitting the data. The Contractor may poll and collect data at intervals exceeding the requirements as necessary to accomplish the work. The minimum requirements for transmission and updating the web site shall be met. Several DCPs can be slaved to a single satellite or cell phone system; however, a backup system shall be available in the event of failure.

2.1.3.3 Global Positioning System (GPS) Units

All GPS units shall have a minimum horizontal accuracy of 1.6 - 9.8 feet as indicated in Engineering Manual 1110-2-1003, "Hydrographic Surveying Manual". Engineering Manuals are available at http://www.usace.army.mil/publications/eng-manuals/em.htm.

2.1.4 Floating Platforms

Floating platforms with waterproof enclosures shall be provided for all floating stations to house the DCPs, satellite links, power source, and other electronic equipment. Each float shall have anchor points, an antenna for data transmission, and an approved navigation light. The Contractor shall be responsible for ensuring the floats meet all applicable navigation requirements and obtaining the necessary permits from the U.S. Coast Guard.

PART 3 EXECUTION

3.1 MONITORING AND REPORTING

3.1.1 Monitoring

The Contractor shall perform water quality monitoring for the specified parameters during all dredging and disposal operations. Monitoring for all water quality parameters shall follow the specifications in the Washington Administrative Code (WAC) 173-201A WAC .

3.1.2 Types of Stations

In-situ monitoring shall be performed using floating stations. Each station shall consist of two sondes suspended in the water column from a floating platform, a DCP for data collection, data telemetry system, power source, and U.S. Coast Guard approved navigation light. Data shall be measured at 15-minute intervals, stored in the sonde memory and DCP, and transmitted to a database/web site at the same intervals.

SECTION 01 57 13.10 28 Page 6

3.1.3 Sampling Locations and Depths

3.1.3.1 All Dredging and In-Water Disposal Areas

Sampling locations shall follow the conceptual plans shown in Figures 1 and

2. (Figures are attached at the end of this section.)

A monitoring zone approximately eight hundred (800) feet long by six hundred (600) feet wide will be created around the active dredging and disposal areas. A Background Reference Monitoring Station shall be located adjacent to the downstream face of the dam if sufficient water depth is available. Background readings at the active dredging sites shall be taken at a distance from shore as recommended by the Contractor unless otherwise specified. Background readings at the disposal site shall be taken at a minimum of four hundred (400) feet from shore to avoid back eddy effects.

An Early Warning Station shall be located two hundred (200) feet (+/- Thirty (30) feet.) downstream of the active dredging zone, but not at the in-water disposal area. The Early Warning Station shall be located in the main direction of river flow and, to the extent practicable, in the direct path of the plume. The Compliance Boundary monitoring stations shall be located nine hundred (900) Feet (+/- thirty (30) feet) downstream of the monitoring zone in the direction of flow towards the thalwag. At the disposal site, the station must be located a minimum of five hundred (500) feet from shore to avoid the back eddy.

The Contractor shall use GPS to record the position of each monitoring station every time the stations are relocated. Water quality measurements shall be recorded at two (2) depths in the water column at each floating platform.

At the active dredge site, one probe would be located one (1) meter (three point three (3.3) feet) below the surface, the second at approximately the middle of the water column, and the third would be situated approximately one (1) meter (three point three (3.3) feet) above the sediment.

At the disposal site, one probe would be located one (1) meter (three point three (3.3) feet) below the surface and the second one would be situated approximately three (3) meters (ten (10) feet) above the sediment. Additionally, sampling shall be subject to the following:

a. Spillway Stilling Basins

When dredging within three hundred (300) feet of the downstream end of the spillway stilling basins, locate the Background Reference Monitoring Station adjacent to the dam if sufficient water depth is available.

3.1.4 Sampling Timing

Timing of sampling shall be as follows:

a. Pre-activity water quality monitoring shall begin one hour prior to commencing work at each dredging site and at the disposal site.

b. If continuous monitoring is interrupted to the extent that sondes are removed from the water and not replaced within twenty four (24) hours (e.g., holiday leave, extended mechanical repairs to the

SECTION 01 57 13.10 28 Page 7 dredge), the pre-activity monitoring protocol shall be followed when dredging or disposal site activity resumes.

c. During all dredging and disposal activities, water quality monitoring shall occur at fifteen (15) minute intervals. Equipment shall be set up in a manner to transmit the fifteen (15) minute data to the database/website provided by the Contractor.

d. Post-activity monitoring shall be measured at fifteen (15) minute intervals at the early warning station at each dredging site and the disposal site until levels return to applicable state standards.

3.1.5 Parameters Monitored

The Contractor shall monitor and report turbidity and depth at 15-minute intervals for each sonde location identified in PART 3 EXECUTION Paragraph

"MONITORING AND REPORTING".

Water samples will be collected during daylight hours to confirm turbidity exceedances and for subsequent laboratory analyses as described in PART 3 EXECUTION paragraph "Adjustments to Dredging and Disposal Operations".

3.1.6 Equipment Calibration

Sondes and the turbidimeter shall be calibrated prior to use. The Contractor shall clean and recalibrate all equipment following the manufacturer's recommendations and whenever there is any indication that the equipment is not performing properly. Calibration of the instruments shall be in accordance with the equipment manufacturer's specifications using recognized industry standards. The Contractor shall submit calibration sheets as required in PART 3 EXECUTION paragraph "WATER

QUALITY MONITORING REPORT".

In the event of elevated turbidity readings during water quality monitoring, the water quality monitoring crew must verify that the sonde is functioning correctly. The monitoring crew shall determine whether the sensor or wiper is working properly and/or take a grab sample (only during daylight hours) at the same depth as the sonde reporting the elevated value with a van Dorn, Niskin, or equivalent sampler and verify the reading with the lab turbidimeter. Water samples to verify in situ turbidity measurements or for supplemental laboratory analyses will not be collected during nighttime hours.

3.1.7 Pre-dredging Monitoring System Test

The Contractor shall have the floating monitoring stations at the disposal site and the dredging site installed and tested no more no less than 24 hours, prior to the start of dredging. Testing shall include recording of data by the sondes and transmission of the data. The COR shall perform a field verification of the monitoring system with the Contractor.

3.1.8 Data Reporting

The Contractor shall report the data in near-real time. Each sonde shall transmit the 15-minute data to the DCP on the floating station. The DCP shall then re-transmit this information to the password protected database/website developed by the Contractor and accessible by the Corps and regulatory agencies. The website shall display the information in

SECTION 01 57 13.10 28 Page 8 tabular and graphical forms and shall be updated every 15 minutes.

3.2 TURBIDITY

3.2.1 Turbidity Limits

Turbidity shall be measured in nephelometric turbidity units (NTU) and shall be maintained below the following limits at the compliance point:

Washington

Turbidity shall not exceed 5 NTU's above background for background levels 50 NTU's or less and shall not exceed a maximum 10% increase when background is more than 50 NTU's.

Background levels for turbidity monitoring shall be measured at the Background Reference Monitoring Station.

3.2.2 Adjustments to Dredging and Disposal Operations

The Contractor shall evaluate measured turbidity data for trends using fifteen (15) minute intervals at the Early Warning and Compliance Boundary stations.

3.2.2.1 Active Dredging Sites

3.2.2.1.1 Early Warning Station

The purpose of the Early Warning station is to provide information that can be used to adjust the dredging operation to mitigate elevated readings at the Compliance Boundary downstream. As such, actions triggered by elevated turbidity readings at this station may be modified using adaptive management, with the goal being no turbidity exceedances at the point of compliance.

The data acquisition system shall be programmed to notify field managers (e.g., use of red, yellow, green color coding or an audible alarm) when the turbidity at one of the sensors is greater than the NTU over the applicable background criteria.

a. If a calculated value surpasses the water quality criteria for two consecutive 15-minute instances the monitoring crew shall:

1. Verify that the sonde is functioning correctly (see PART 3 EXECUTION paragraph "Equipment Calibration"),

2. Visually assess the station vicinity for potential outside influences such as malfunctioning dredging equipment or turbidity produced by a tug boat propeller, wake, barge, or wind if conditions permit, and

3. Evaluate the data at the Compliance Boundary, taking into consideration the water travel time from one station to the other (see PART 3 EXECUTION paragraph "Compliance Station" (a).

b. If the monitoring crew determines that the elevated turbidity is attributed to the dredging, then:

1. If there are signs of elevated turbidity at the point of

SECTION 01 57 13.10 28 Page 9 compliance (i.e. turbidity is above background - even if it is below the standard) the monitoring crew shall notify the contractor's dredge operator. The contractor shall assess the current work methodology and implement best management practices (BMP's) to reduce turbidity. The monitoring crew shall wait at least thirty (30) minutes to one (1) hour after implementing any additional BMPs and re-evaluate the Early Warning measurements.

2. If turbidity at the point of compliance is equal to or less than background, then no further action is required.

3. If repeated elevated turbidity at the Early Warning point is not associated with either elevated turbidity or turbidity exceedances at the point of compliance, then the turbidity trigger for BMPs may be re-assessed for the Early Warning point. The contractor must meet with Corps and Ecology to modify the Early Warning point turbidity trigger.

c. if the monitoring crew determines that the elevated turbidity is attributed to the disposal, then:

1. If there are signs of elevated turbidity at the point of compliance (i.e., turbidity is above background - even if its is below the standard) the monitoring crew shall notify the contractor's dredge operator. The contractor shall assess the current work methodology and implement Best management Practices (BMP's) to reduce turbidity. The monitoring crew shall wait at least 30-minutes to one-hour after implementing any additional BMPs and reevaluate the Early Warning measurements.

2. BMPs at disposal sites will include:

i. Relocating the disposal site within the disposal site boundary, and

ii. Changing the disposal release speed.

3. If turbidity at the point of compliance is equal to or less than background, then no further action is required.

4. If repeated elevated turbidity at the compliance point is not associated with either elevated turbidity or turbidity exceedances at the point of compliance, then the turbidity trigger for BMPs may be re-assessed for the compliance point. The contractor must meet with USACE and Ecology to modify the compliance point turbidity trigger.

3.2.2.1.2 Compliance Station

The fifteen 15) minute data from the Compliance Boundary location shall also be set-up with an alarm system to alert the monitoring crew if the compliance station data, allowing for estimated water travel time from the active dredging area and sensor accuracy, exceeds the applicable NTU level.

a. If a fifteen (15) minute calculated value from either of the turbidity sensors exceeds the applicable NTU level, the monitoring crew shall:

SECTION 01 57 13.10 28 Page 10

1. Verify that the sonde is functioning correctly,

2. Visually assess the station vicinity for potential outside influences such as malfunctioning dredging equipment or turbidity produced by a tugboat propeller, wake, barge, or wind if conditions permit .

3. Determine if there is a correlation to a similar event at the Early Warning station, taking into consideration the estimated water travel time between stations, and

4. Determine if the elevated turbidity is confirmed by a consecutive reading above the turbidity criteria.

b. If a turbidity exceedance is confirmed by the evaluations listed in PART 3 EXECUTION paragraph "Compliance Station" (a) above, the monitoring crew shall notify the dredge contractor. In addition,

1. The contractor shall take appropriate corrective action (beyond those taken to modify the work activity for the elevated measurements at the Early Warning station) as necessary in order to meet turbidity standards and shall submit its contingency response action(s) to the Corps immediately.

2. The monitoring crew shall wait one hour after the dredge operator has implemented its contingency response actions to allow time for the changes to take effect, and then evaluate the 15-minute data again.

c. In the event that the contractor's contingency response actions do not achieve compliance with the water quality criteria, or in case or repeated exceedances at the point of compliance, the contractor shall:

1. Discontinue any additional in-water work until the problem is resolved.

2. Meet with the Corps and Ecology to discuss the water quality monitoring observations and contingency response actions taken by the contractor, and to identify additional contingency response actions that the contractor could implement to comply with the water quality criteria.

3.2.2.2 In-Water Disposal Site

Water quality monitoring at the in-water disposal site shall follow a protocol similar to the one presented for the active dredging site.

However, since the discharge from the bottom-dump barge is episodic (approximately three to six events per twenty four 24) hour period) compared to the near-continuous activity at the dredging site, the bottom-dump phase of the monitoring is modified.

3.2.2.2.1 In-Water Disposal

An Early Warning station will not be utilized when in-water disposal is occurring. The fifteen (15) minute data from the Compliance Boundary station shall be used to assess whether turbidity is produced by the bottom-dump barge operation. Since the scow would have completed its

SECTION 01 57 13.10 28 Page 11 bottom-dump action by the time any increase in turbidity is registered at the monitoring station, real-time management is not practical. However, if the resulting turbidity at the Compliance Boundary is greater than the water quality criterion, the feasibility of increasing the rate of discharge from subsequent barges to minimize turbidity effects shall be assessed.

NOTE: Bottom-dump barge operations is used in the paragraphs above, but others disposal methods that meet the turbidity standards are acceptable such as using an excavator/loader on a material barge to offload material at the disposal site.

3.2.3 Failure to Comply

If the Contractor fails or refuses to act promptly, the Contracting Officer may issue an order stopping all or part of the work until satisfactory corrective action has been taken. No part of the time lost due to any such stop orders shall be made the subject of a claim for extension of time or for excess costs or damages by the Contractor.

3.3 WATER QUALITY MONITORING REPORT

Following completion of all dredging and disposal activities, the Contractor shall submit a final water quality monitoring report.

The report shall contain:

a. Methods used for sonde and turbidimeter calibration, as well as DCP programming.

b. Calibration information to include:

1. Performance of each sonde and turbidimeter relative to the standards.

2. Calibration sheets indicating corrective actions taken if the equipment calibration was out of specification.

3. Suppliers and lot numbers of calibration and reference standards.

c. QA information for turbidity to include:

1. Results of the certified turbidity samples measured by the turbidimeter.

2. Recoveries for batch QA samples when using reference material.

3. Results of Government provided performance evaluation (PE) material or blind QA samples, if applicable.

d. GPS coordinates and total depth where field measurements were taken.

e. Results of the turbidity plume tracking described in PART 3 EXECUTION paragraph "Compliance Station" (b) for dredging and in-water disposal.

f. Statistical analyses (e.g. means, standard deviations, t-tests, and 95 percent confidence intervals) along with a discussion that

SECTION 01 57 13.10 28 Page 12

G4EDDMTJ

Line correlates the quality of the data measured by the sondes to the calibration and in-vitro data.

g. Project event log documenting all non-routine events that occurred during the project, and what corrective measures were taken in each instance.

h. Location and date of sampling shall be included for all data in the report.

3.3.1 Electronic Files

All information (e.g., electronic data, scanned material, analyses, graphs, and tables) shall be turned over to the Corps in Microsoft Office 365, or newer version. The location and date of sampling shall be included for all data in the report. A complete electronic copy of the data shall be submitted at the end of the project.

3.3.2 Database

All of the water quality data measured by the water quality sondes and transmitted to the website shall be input into a Microsoft Access database and delivered to the Corps when the project is complete.

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SECTION 01 57 13.10 28 Page 13

SECTION 01 57 13.10 28 Page 14

1.8 USE OF WALLA WALLA DISTRICT PARKS

2.1.3.3 Global Positioning System GPS Units

2.1.4 Floating Platforms

3.2.3 Failure to Comply