Amend 0010 Revised_022450.pdf

Environmental Restoration of Outfall 008

SECTION TABLE OF CONTENTS

DIVISION 02 - EXISTING CONDITIONS

SECTION 02 24 50

CONSTRUCTION WATER TREATMENT

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 DESCRIPTION OF WORK

1.3.1 General

1.3.2 Project Conditions

1.3.3 Work Included

1.3.3.1 Contractor's Plan

PART 2 PRODUCTS

2.1 PRIMARY WATER TREATMENT EQUIPMENT

2.2 WATER TREATMENT PLANT CONTROLS

PART 3 EXECUTION

3.1 WATER TREATMENT - GENERAL

3.2 SEQUENCING AND SCHEDULING

3.3 SYSTEM DESCRIPTION

3.3.1 Commissioning Step

3.3.2 Start-Up Step

3.4 TESTS, INSPECTIONS, AND VERIFICATIONS

3.4.1 Treatment System Performance Monitoring Reports

3.4.2 Treatment System Start-Up

3.5 DISPOSAL OF OTHER RESIDUALS

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SECTION 02 24 50

CONSTRUCTION WATER TREATMENT

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 within the text by the basic designation only.

AMERICAN PETROLEUM INSTITUTE (API)

API Std 650 (2013; Errata 1 2013; Addendum 1 2014;

Errata 2 2014; Addendum 2 2016; Addendum 3 2018) Welded Tanks for Oil Storage

AMERICAN WATER WORKS ASSOCIATION (AWWA)

AWWA 10084 (2017) Standard Methods for the Examination of Water and Wastewater

ASME INTERNATIONAL (ASME)

ASME B40.100 (2013) Pressure Gauges and Gauge Attachments

ASTM INTERNATIONAL (ASTM)

ASTM D2035 (2013) Standard Practice for Coagulation-Flocculation Jar Test of Water

ASTM D3299 (2010) Filament-Wound Glass-Fiber-Reinforced Thermoset Resin Corrosion-Resistant Tanks

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE C2 (2017; Errata 1-2 2017; INT 1 2017) National Electrical Safety Code

INTERNATIONAL SOCIETY OF AUTOMATION (ISA)

ANSI/ISA 5.1 (2009) Instrumentation Symbols and Identification

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA MG 1 (2016; SUPP 2016) Motors and Generators

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2017; ERTA 1-2 2017; TIA 17-1; TIA 17-2;

TIA 17-3; TIA 17-4; TIA 17-5; TIA 17-6;

TIA 17-7; TIA 17-8; TIA 17-9; TIA 17-10;

TIA 17-11; TIA 17-12; TIA 17-13; TIA

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17-14; TIA 17-15; TIA 17-16; TIA 17-17 )

National Electrical Code

NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY (NIST)

NIST SP 250 (1991) Calibration Services Users Guide

1.2 SUBMITTALS

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

submittals not having a "G" designation are for information only. When used, a designation following the "G" 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

Contractor's Plan; G, DO

SD-02 Shop Drawings

System Components; G, DO

SD-06 Test Reports

Treatment System Performance Monitoring Reports; G, DO

Treatment System Start-Up; G, DO

SD-11 Closeout Submittals

Daily Report; G, DO

1.3 DESCRIPTION OF WORK

1.3.1 General

The contractor shall submit a waste water treatment and management plan as part of the environmental protection plan described in 01 57 20.

Contractor shall provide and maintain a water treatment plant (WTP) that is capable of treating and discharging water in accordance with the allowable discharge limits and other requirements of the discharge permit equivalency to be provided by the Connecticut Department of Energy and Environmental Protection (CT DEEP) and the Drawings/Specifications.

Contractor shall provide, install, operate and maintain collection, conveyance, treatment trains, and discharge conveyance for water generated and treated from all sources.

Contractor shall maintain Daily Discharge Volume Logs obtained from a continuously totalizing water meter (gallons treated), hours of treatment system operation, and other pertinent data for the COR's verification and approval, in accordance with the discharge permit equivalency.

Contractor's Daily Report of water treatment activities shall be in a format acceptable to the USACE and shall include the results of daily system inspections.

Minimum requirements for a the WTP are provided in the following sections of this specification. The Contractor is responsible for the final design and performance of the WTP.

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Contractor shall prepare and submit a design including but not limited to treatment train process and flow diagram, design flow, System Components, system layout, location layout, discharge location and criteria within the Contractor's Plan in accordance with the procedures set forth in Specification Section 01 33 00 SUBMITTAL PROCEDURES.

Contractor shall follow the approved water treatment plan, and be responsible for meeting the requirements of the discharge permit equivalency.

All equipment and electrical systems shall be in compliance with NFPA 70 .

Contractor is responsible for all fines and penalties associated with non-conformance of the system in meeting the discharge permit equivalency.

1.3.2 Project Conditions

Remediation construction activities will generate water impacted with target SAEP site contaminants and potentially other Non-target site contaminants. Contractor will be required to meet all discharge requirements for treatment and disposal, whether they are disposed via NPDES, at a Publicly Owned Treatment Works or other means.

Contractor must discharge water resulting from dewatering of sediments associated with the Outfall 008 remedial work areas. Dewatering discharge points will be at the end of the causeway for remediation of the Outfall 008 work.

For these discharge waters, discharge will be off the causeway at a rate not to exceed 250 gallons per minute (gpm) from a 8 inch pipe that will rest on the bottom of the river for a distance of 20 m or more offshore such that discharge occurs in the main channel of the Housatonic River but outside of the Federal Channel, does not create substantial pluming of suspended sediment, does not contribute to erosion, and does not interfere with the work area. Effluent must be pretreated such that discharge complies with the substantive provisions of the CT DEEP General Permit for water discharge of the General Statutes of the State of Connecticut.

Sampling of effluent must occur after the final treatment stage but before it is discharged, therefore the system must be designed to accommodate sample collection (refer to Subpart 1.3.3 below).

1.3.3 Work Included

Procurement or rental and installation of the required treatment plant components, including storage on the influent and effluent sides of the plant, extraction of the dewatering liquids, means of conveyance to the WTP, and the treated effluent discharge system.

Procurement and installation of a secondary containment system for the WTP.

All sampling, testing, and reporting required for start-up and operation of the WTP.

Cleanup and removal of all solids generated during dewatering liquid treatment as well as the WTP components are included along with the dewatering fluid extraction and transportation system.

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1.3.3.1 Contractor's Plan

(Prior to bidding, the Contractor may, at its discretion and expense, conduct a treatability study of the material.) Prepare a detailed work plan for on-site treatment of all water collected that has contacted contaminated materials throughout the proposed remediation activities. The work plan shall be submitted for review and approval by the USACE prior to startup of the treatment plant. The work plan shall include as a minimum:

a process flow diagram, site layout of the proposed WTP, unit sizing, a description of handling and off-site disposal of all solids generated (sediments, sludges, and used or spent consumable media or parts), off-site disposal methods, operating schedule, storage requirements, and sampling and analysis schedule (in accordance with requirements of the permit equivalency). The analysis schedule shall indicate which parameters are to be analyzed for and each sample taken. The method of secondary containment shall be provided in the work plan.

Work Plan shall also include preliminary plans for conveyance from the contaminated sediment handling areas (Excavation site, Sediment Management Bins, and Beneficial Reuse stockpile) to the WTP. Contractor shall provide design calculations that capture and treat stormwater runoff for up to a 25 year design storm frequency in the region. Calculations shall include all necessary means and methods for the transfer of stormwater to the WTP including any temporary on-demand pumping systems and conveyance piping

PART 2 PRODUCTS

2.1 PRIMARY WATER TREATMENT EQUIPMENT

Contractor shall provide a system capable of performing the following unit process functions at a minimum:

1. Influent water storage, equalization, and settling.

2. Removal of suspended solids by gravity separation and filtration.

3. Removal of dissolved components via activated carbon filtration.

Contractor shall choose the type and size of equipment, gauges (compliant with ASME B40.100 ) and components needed to accomplish the functions designated.

The WTP(s) shall be designed to treat all water generated during excavation/restoration dewatering, sediment dewatering and decontamination water.

Contractor shall provide and maintain conveyance and connection to discharge point. Contractor shall provide all materials, labor, traffic control, permits, roadwork and all other work for connecting the water treatment system permitted/approved discharge point.

Contractor shall furnish a discharge pump with sufficient capacity to achieve the discharge requirements of the treatment system.

Contractor shall provide a standby generator with sufficient capacity to provide power to the WTP and dewatering operations in the case of hard line electrical outage. Equipment wiring shall be such that dewatering and treatment may continue without interruption or minor interruption in the event of a power outage. Generators shall be whisper quiet to the extent

SECTION 02 24 50 Page 5 possible.

Contractor shall utilize sound enclosures for any backup or primary generators used to power water treatment equipment.

Contractor shall provide freeze protection for all water treatment equipment, piping, and pipe connections to allow for operation through the winter months, which will be required to meet the overall project schedule objectives, including but not limited to: insulation, enclosures, heaters, heat tapes, and circulation pumps.

The materials and equipment used for the WTP may be new or used but must be suitable for the work and be maintained in good condition.

Contractor shall keep on hand, or have immediate access to, spare components to provide reasonably for any breakdown.

All water treatment and storage equipment shall be compliant with API Std 650 and ASTM D3299 and remain the property of the Contractor and shall be properly decontaminated prior to removal from the site at the completion of the Work.

Contractor shall provide and maintain at all times a flow meter to record water discharged to the discharge system. The flow meter shall record instantaneous and totalized flow.

Contractor shall provide sampling ports for collecting samples in accordance with the discharge requirements.

Contractor shall provide all necessary safety equipment and personnel protective equipment for safe handling of contaminated water and water treatment chemicals. SDSs for all water treatment chemicals shall be stored on site and submitted to the USACE. Copies of these shall be available upon request at the project.

2.2 WATER TREATMENT PLANT CONTROLS

Contractor shall provide adequate system controls to permit unattended operation with occasional operator checks for monitoring and adjustments;

however, a Contractor representative must be on site during all times of system operation. System shall be capable of 24 hours per day and 7 days per week operation.

Contractor shall install gauges and other monitoring equipment to monitor the pipeline discharge performance to ensure sufficient flow rates to ensure adequate dilution continually occurs. The Contractor shall provide a notification system, such as pressure gages, to alert an operator if the system experiences conditions that will potentially cause the WTP to shut down or cause a malfunction that would result in an exceedance of the discharge criteria.

Contractor shall provide high-level alarms on tanks to prevent overflow conditions. Alarms may cause automatic actions to relieve the condition or may warn the operator.

If an upset condition occurs, which may result in a release or nonconformance with discharge requirements, Contractor shall immediately suspend operation and notify the USACE.

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Secondary containment equal to 110% of the volume in storage shall be provided for all water containing vessels associated with the treatment system.

All controls and electrical shall be compliant with IEEE C2 , ANSI/ISA 5.1 and NEMA MG 1.

PART 3 EXECUTION

3.1 WATER TREATMENT - GENERAL

Contractor shall furnish all labor, materials and equipment, and perform all operations required to design, furnish, install, test (in compliance with AWWA 10084, ASTM D2035 and NIST SP 250 , if necessary), operate, and maintain the water treatment equipment, including: storage tanks, pumps, process equipment, water treatment chemicals, water meters, process controls, operator alarms, dikes, sandbags, electric power supply and distribution, and domestic water supply and distribution, as required to treat the collected water.

Contractor shall place equipment at the location designated on the Drawings or propose a new location to be approved by USACE. In as much as possible, equipment should be located in a permanent location for the entire duration of the project.

Contractor shall arrange components and provide means to contain any spills or overflows from the treatment process within the secondary containment.

Contractor shall provide spill containment for any water treatment chemicals used on the site.

Contractor operate and maintain collection, conveyance and tertiary treatment trains for water generated.

Contractor shall establish, maintain and document quality control, as required in Specifications Section 01 33 00 - Submittal Procedures.

USACE may specify and require additional records from the Contractor as needed to satisfy permit equivalency and project requirements.

The Contractor is responsible for payment of any fines or fees levied due to the proposed discharge and for any financial penalty imposed for not meeting the discharge limitations stated in this specification section.

3.2 SEQUENCING AND SCHEDULING

Contractor shall conduct water treatment activities in conjunction and coordination with decontamination, excavation, dewatering and backfilling Work. Contractor shall be responsible for coordinating water treatment with all other site activities.

The Contractor shall provide a water treatment system with the treatment and storage capacity to manage water from dewatering operations without causing construction delays.

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3.3 SYSTEM DESCRIPTION

3.3.1 Commissioning Step

After installation of the dewatering treatment facility is complete, the treatment facility shall be run using clean, potable water to test piping, pumps, and tanks for leaks. Once the treatment system is determined to have no leaks, the treatment system may be started.

3.3.2 Start-Up Step

Provide enough water volume necessary to operate the treatment system for at least a 4-hour period at the design flow rate.

Start the pumps (dewatering/transfer) and fill the influent storage tank(s).

Start the WTP.

Operate the WTP for a minimum 4-hour period, store the treated effluent in the effluent storage tank(s) provided, and test the treated effluent for conformance with the discharge limitations. (See Appendix C ).

If the discharge limits are met, the treated effluent can be discharged.

If not, modifications and/or additions to the treatment system will have to be made and the treated effluent will be retreated, until it meets the discharge criteria. The start-up procedure will be repeated until the water can be treated in one pass and meet the discharge criteria.

Run the WTP as required to treat dewatering and other remediation fluids during remediation activities in accordance with the discharge limits

3.4 TESTS, INSPECTIONS, AND VERIFICATIONS

3.4.1 Treatment System Performance Monitoring Reports

Including sample dates, time, record of laboratory results, and reports of exceedances of the discharge limits.

3.4.2 Treatment System Start-Up

Written report of treatment system start-up including discussion of any mechanical problems, treatment problems, and number of treatment recycles utilized. Include discussion on any modifications or additions required to be made to the treatment facility during this period. If additional equipment is added to the treatment system, provide a modified process flow diagram, site layout sketch, and a description of the changes made.

3.5 DISPOSAL OF OTHER RESIDUALS

Contractor shall dispose of settled solids, and spent media to an approved disposal facility. Granular activated carbon adsorption media can also be transported to an USACE-approved facility for regeneration.

Contractor shall manage and dispose of settled solids, and spent media in accordance with all transportation laws and regulations and the receiving facility requirements.

SECTION 02 24 50 Page 8 shown in Appendix C.

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