LMDT_WTP_Membrane_Pilot_1_-_SOW.pdf

Leadville Mine Drainage Tunnel Water Treatment Plant - Leadville - Colorado Section C Leadville Mine Drainage Tunnel Water Treatment Plant Membrane Pilot Study Specifications No. XXXXXX

SECTION C – STATEMENT OF WORK

Leadville Mine Drainage Tunnel Water Treatment Plant Membrane Pilot Study Leadville Mine Drainage Tunnel Water Treatment Plant – Leadville – Colorado

PART 1 INTRODUCTION:

1.01 Acronyms

CDPHE – Colorado Department of Public Health and Environment CEB – Chemical Enhanced Backwash CIP – Clean in Place CO – Contracting Officer COR – Contracting Officer Representative EPA – Environmental Protection Agency JHA – Job Hazard Analysis LHM – List of Hazardous Materials LMDT – Leadville Mine Drainage Tunnel MF - Microfiltration OGR – Onsite Government Representative OSHA – Occupational Safety and Health Administration QAE – Quality Assurance Evaluator Reclamation – Bureau of Reclamation RSHS – Reclamation Safety and Health Standard RSN – Required Submittal Number SCC – Solids Contact Clarifier SDS – Safety Data Sheet TMP – Transmembrane Pressure UF – Ultrafiltration WTP – Water Treatment Plant

1.02 Background

The existing Leadville Mine Drainage Tunnel (LMDT) Water Treatment Plant (WTP) treats flow from the LMDT to meet permit requirements for discharge to the headwaters of the Arkansas River. The facility currently has a mixed media gravity filter as a polishing step following the solids contact clarifier (SCC), where primary precipitation and removal of metals occurs.

The LMDT WTP has constituents (principally calcium and manganese) that are present in the influent to the mixed media filtration process (Part 11.02-1) and historically have precipitated on the media, causing plugging, clumping and changes to specific gravity (Part 11.01-1). This in turn causes backwashing problems, filter channeling, and mixing of the different media layers, rendering the filtration process to require frequent backwashing and media replacement every 15 months. The frequent need to rebuild media filtration equipment at the LMDT WTP has been extremely costly and disruptive to the reliability of WTP operation. Since the existing media filter was constructed in 2013, Reclamation has contracted to rebuild the filter two times. The LMDT WTP staff have implemented an acid feed system to lower the pH that was feeding the

Statement of Work media from the 9.8-10.3 range to maintaining a pH 8.2 setpoint, to control calcium carbonate precipitation on the media, but manganese precipitation is not a pH driven precipitation process and could still be problematic. It is difficult to aggressively clean (e.g. low pH) the media in-situ due to potential release of problematic constituents, generation of large quantities of hazardous backwash and potential difficulty in treating the volume of aggressive solution. Current understanding of membrane filtration indicates that replacing media filtration with membrane filtration may improve reliability of WTP operation and reduce long term costs.

Membrane filtration is a viable filtration process that can be used in lieu of media filtration.

Membrane filtration for the purposes of this section will be limited to a discussion on microfiltration (MF) and ultrafiltration (UF), since these membranes are used to principally remove suspended solids (similar to a media filter) from a liquid matrix (water in this case). MF has an approximate pore size of 0.1 micron and UF has an approximate pore size of 0.01 micron, allowing for greater than an order of magnitude particle size removal as compared to media filtration (3-5 micron). MF and UF membranes are typically cleaned with solutions that target organic fouling (high pH and/or a disinfectant – typically chlorine) and target inorganic scaling (low pH using an organic acid, e.g. citric acid). MF and UF membranes are typically fabricated as a hollow fiber, where the water to be treated is typically on the outside of the fiber and flows

in. Alternatively, the membranes can also be fabricated to facilitate an inside to outside flow treatment path. Another potential option would be to use ceramic membranes.

The success of the MF or UF membrane unit is dependent upon how well the process operates without scaling, or if scale is formed, how well it is removed through back-pulsing and chemical cleaning. Engineering controls to the potential risks include analysis of feed water quality to determine if any problematic scaling can form. If scaling can be removed through cleaning, the frequency of cleaning could impact membrane replacement frequency (e.g. from a typical 7-year replacement interval to a significantly higher replacement interval). Cleaning frequency is also an important parameter to understand to design membrane units for proper process throughput.

Replacing the mixed media filter with an MF or UF process would yield a process with a significantly smaller pore size causing more suspended solid material to be intercepted by the MF or UF unit. This could increase the potential of scale formation but would also improve WTP effluent water quality. If scale formation has been detected it should be determined if cleaning solutions are effective at fully recovering membrane permeability. It is important to pilot test this process over a long period of time encompassing runoff conditions and simulated system upsets to determine if any operational problems arise which cannot be rectified through chemical cleaning and backwashing.

Due to chemical storage considerations at the LMDT WTP, it is preferred that if new processes are added that no new chemicals be introduced with them. Currently, sulfuric acid (H2SO4) and sodium hydroxide (NaOH) are used for pH adjustment at the LMDT WTP. It also should be determined if waste streams of these chemicals in a MF or UF process could actually be repurposed for beneficial use in the WTP.

The LMDT WTP is located just north of Leadville, CO at 749 N. Hwy 91 Leadville, CO 80461.

Statement of Work

Statement of Work

PART 2 SCOPE:

This is a prescriptive requirement to pilot test a membrane unit at the LMDT WTP. The Contractor shall be responsible for all aspects of supplying a pilot membrane filtration process including: rental of a unit on a monthly basis, commissioning, training, startup, decommissioning, five site visits in addition to startup and decommissioning and remote monitoring and support.

2.01 Area of responsibility for Contractor:

The specific scope requirements are to provide rental pilot equipment, remote and site support, encompassing the following:

a. Provide a membrane pilot unit with at least one full scale membrane module with a nominal pore size of sub 0.1 micron and automatic backwash capability. The minimum flow rate per membrane module will be at least 10 gpm.

b. The membrane must be made of polyethersulfone (PES) or ceramic material.

c. Chemical maintenance and clean in place cleanings of the membrane must be accomplished with sodium hydroxide and sulfuric acid and no additional chemicals (no chlorine or citric acid).

d. The pilot system will be delivered to the LMDT WTP.

e. Site hookups to existing water, power and any other requirement for operation are the Contractors responsibility. Site hookup information will be provided in RSN 2.01-1

f. Startup, commissioning, and training will be provided by Contractor.

Training will be performed in accordance with the Contractor Operation Manual (RSN 2.02-2).

g. Daily monitoring of pilot performance and operations will be performed via remote access by the Contractor, this includes data charting and optimization of operating parameters. Data will be shared with the Owner on a biweekly basis and will include turbidity, inlet pressure, outlet pressure, trans-membrane pressure (TMP), temperature, conductivity, pH and flux for each module. A trended data sampling and reporting plan will be provided as RSN 2.02-3 and approved by the Owner.

h. Clean in Place assistance and supervision will be provided as needed by the Contractor. The Contractor will be on-site to provide training during the first Clean in Place cycle.

i. Timely consultation, equipment repair and replacement services during the pilot study will be provided by the Contractor.

j. Calibration of instrumentations and the pilot system flow and pressure equipment to be performed by the Contractor during site visits.

Statement of Work

k. Contractor participation is required for updates in bi-weekly conference calls. Additional calls may be scheduled upon agreement.

l. A final pilot testing report will be furnished by the Contractor within 3 weeks of completion of the pilot.

m. If requested, one pilot-tested membrane module can be provided to the Owner for autopsy.

n. If unit is larger than 5.5 ft x 12 ft it will be located outside. Contractor must include provisions to prevent freezing (RSN 2.01-4)

o. The Contractor will provide lifting, unloading and placement services for the pilot equipment. If the pilot equipment is to be located inside, Contractor is responsible for placing equipment in 5.5 ft x 12 ft space through a 14 ft wide x 13 ft high roll-up door.

2.02 Area of responsibility for Owner/End User:

a. Feed water supply from SCC effluent after pH adjustment to approximately 8.2, although a pH as high as 10.3 may be fed to the membrane during challenge conditions. Connection to pilot equipment will be coordinated with the Contractor. A schematic of connections to the membrane pilot equipment, including feed water supply, will be provided as RSN 2.01-2 as described previously.

b. Neutralization of Chemical Enhanced Backwash (CEB) and Clean-in- Place (CIP) wastewater and disposal. This includes all collection/holding tanks which may be necessary.

c. Owner will provide a relatively flat gravel surface outside or space on plant floor for process equipment. Maximum space on plant floor available for equipment is 5.5 ft x 12 ft.

d. Daily checks and chemical supply top-up/refill during non-staffed operation.

e. All CEB/CIP chemicals and coagulants.

f. All spill containment, overflow provisions, environmental protection provisions, stormwater runoff and other safety provisions will be addressed in the safety program (see 7.03)

g. All necessary laboratory testing will be performed by Owner. Laboratory testing of the influent and effluent should occur once per week, and at more frequent intervals during periods of upset. Laboratory sampling will take place at a Colorado Department of Public Health & Environment (CDPHE) certified lab and will include weekly influent and effluent pH, calcium, manganese, zinc, cadmium, aluminum, copper and iron as grab samples. All metals will be analyzed as total. Additionally, monthly influent and effluent grab samples of all metals regulated in discharge permit. Additionally, bi-weekly samples of backpulse/backwash, CIP

Statement of Work cleans and maintenance cleans should be analyzed for the aforementioned constituents.

h. Laboratory sample collection and shipping during non-staffed operation.

i. Owner may perform on-site testing at any time, including turbidity, pH, etc.

PART 3 OBJECTIVES:

a. The intent of this contract is to evaluate the treatment efficacy and operation requirements of membrane filtration to treat effluent water from the solids contact clarifier at the LMDT WTP during a three month pilot study.

PART 4 PERIOD OF PERFORMANCE:

a. The period of performance for testing is three months.

b. The testing shall include a time period sufficient to incorporate the spring run-off season (approximately May - June) and a baseline period before the runoff occurs.

c. All necessary equipment shall be in place and the pilot should be operational on or before April 15th, 2019.

d. RECOGNIZED HOLIDAYS. The Contractor may be not required to provide services on recognized Federal holidays established by Federal law (5 U.S.C. 6103). A schedule of the recognized holidays can be found at the following website: https://www.opm.gov/policy-data-oversight/snow-dismissal-procedures/federal-holidays/#url=2018

PART 5 PLACE OF PERFORMANCE

a. Work will take place at the site of the Leadville Mine Drainage Tunnel Water Treatment Plant. The physical address of the plant is 749 N. Hwy 91 Leadville, CO 80461.

b. The Contractor shall have access to the site from 06:30 to 17:00 Monday through Friday. Should Contractor require site access outside these times, it must be coordinated at least one week in advance with the plant supervisor and COR.

c. The Contractor shall notify the on-site government representative (OGR) of any unscheduled site visits at least two hours prior to entrance.

Statement of Work

d. The Place of Performance is located at approximately 10,000 ft elevation.

Precautions to prevent freezing must be included.

PART 6 SECURITY AND SITE ACCESS

A. In accordance with WBR 1452.237-80, the Contractor shall be required to supply Reclamation with a list of Contractor and subcontractor personnel and equipment which will be on site for the duration of this contract as RSN 6.01-1.

B. All Contractor produced and Government furnished information related to this contract is designated Public Information (Non Official-Use-Only).

C. All vehicles entering the worksite will be subject to search.

PART 7 COMMON REQUIREMENTS

7.01 MOBILIZATION:

A. Use of Site:

1. The Contractor shall clean all equipment in accordance with Reclamation

Technical Memorandum No. 86-68220-07-05 “Inspection and Cleaning Manual for Equipment and Vehicles to Prevent the Spread of Invasive Species”, 2012 edition, prior to delivery to the worksite.

a. The Contractor shall coordinate delivery of equipment to the worksite with the OGR to provide the Government with the opportunity to inspect the equipment.

2. The Contractor shall restore use areas to pre-pilot condition.

7.02 SAFETY DATA SHEETS:

A. Comply with paragraph (e) of clause at FAR 52.223-3, Hazardous Material Identification and Material Safety Data - Alternate 1.

B. Submit copies of updated List of Hazardous Materials (LHM) and Safety Data Sheets (SDS) to OGR at least 14 days before delivering hazardous materials to job site.

C. Submit the following to OGR

1. RSN 7.02-1, Complete LHM and SDS.

2. RSN 7.02-2, Updated LHM and SDS.

D. Do not deliver hazardous materials to jobsite which are not included on original or previously updated LHM and SDS before receipt of updated LHM and SDS by OGR.

Statement of Work

E. For the purposes of this contract, “delivered under this contract” in paragraph (b) of the clause at FAR 52.223-3, Hazardous Material Identification and Material Safety Data - Alternate 1, includes:

1. Materials delivered to Government.

2. Materials incorporated into work.

3. Materials used by the Contractor during contract performance at the jobsite.

7.03 SAFETY AND HEALTH:

A. The Contractor shall provide necessary precautions at all times for the protection of the public and employees as outlined by federal, state and local regulations.

1. These include, but not limited to: OSHA, EPA (Environmental Protection

Agency), and Reclamation Safety and Health Standards (RSHS) in accordance with WBR 1452.223-81.

B. Submit the following

1. RSN-7.03-1, Site Specific Safety Program:

a. Written Safety Program in accordance with Section 3 of the RSHS.

b. Cover all aspects of on-site and applicable off-site operations and activities associated with this contract.

c. Program must follow the format of the outline in Appendix B of RSHS.

d. Will not be accepted for review by the COR unless it addresses, in order, lettered and numbered per Appendix B, a narrative for each applicable item in the outline.

1) For items in the outline that do not apply to this contract write

“Not Applicable to Contract” next to the number/letter.

e. Provide a list of Job Hazard Analyses (JHA) for all major or distinct phases of work that will be submitted throughout the project as RSN 7.03- 2.

f. A generic Company Safety Plan is not acceptable. The Safety Program must be site specific for this contract.

g. The Contractor’s Safety Program must be submitted and accepted by COR prior to commencing on site work.

2. RSN-7.03-3, Monthly accident summary report:

a. Form 7-2218 or other acceptable form in accordance with paragraph 3.8 of

RSHS.

7.04 UTILITIES:

A. ELECTRICITY:

Statement of Work

1. Electricity is available at the work site as follows:

a. 460 V, 3 phase, 60 Hz, 200 amp fusible breaker

B. HIGH SPEED DATA NETWORK:

1. A very poor cellular signal is present. Contractor should provide cellular hot spot.

2. Internet connectivity is not available.

C. POTABLE WATER:

1. The Contractor shall provide potable water for staff.

D. RESTROOM/LAVATORY:

1. Toilet facilities with lavatories are available on site.

7.05 QUALITY PROCEDURES:

A. Government Quality Assurance: Pilot is to be operational for at least 95% of time it is onsite in either water production, backwashing/backpulsing, maintenance or Clean in Place operation. If the pilot is inoperable due to a process failure where parts are readily available for repairing the unit the repair must be conducted within 72 hours of failure.

If the repair requires process equipment that has a long lead time, Contractor will discuss with Owner possible solutions to the issue and pilot testing will be extended for the same amount of time as system shutdown.

PART 8 GOVERNMENT FURNISHED PROPERTY:

A. No Government Property, Materials, or equipment will be provided to conduct the work.

PART 9 DELIVERY:

9.01 SUBMITTALS:

A. A table of required submittals is included in Part 11.02-2

PART 10 POINTS OF CONTACT:

Contracting Officer (CO)

Edward Marshburn

Statement of Work

PART 11 APPENDICES

11.01 Figures

1. Scaling on the media of the existing LMDT WTP filter process. Note the anthracite that is typically black is white in color, indicating the presence of calcium carbonate scaling. Additionally note the uneven surface of the filter bed indicating ineffective backwashing and potential for short circuiting while operating

Statement of Work

11.02 Tables

1. Median Water Quality at Influent to LMDT WTP Media Filters

Parameter Media Filtration Influent (Total) Aluminum [ug/L] 20 Ammonia [mg/L] <0.10

Arsenic [ug/L] <2.0 Bicarbonate [mg/L as CaCO3] 18.6

Cadmium [ug/L] <0.1 Calcium [mg/L] 49.5 Chloride [mg/L] 6.6 Copper [ug/L] 10

Flouride [mg/L] <0.10 Iron [ug/L] 40 Lead [ug/L] <1.0

Magnesium [mg/L] 25.5 Managnese [ug/L] 250

Mercury [ug/L] <0.25 Nitrate [mg/L] <0.30 pH 8.5 Potassium [mg/L] 1.1 Selenium [ug/L] <2.0

Silver [ug/L] <0.2 Sodium [mg/L] 20.6 Sulfate [mg/L] 240.5

Turbidity [NTU]* <0.1 - 0.3 Zinc [ug/L] 60

*Turbidity during upset events as high as 20 NTU

2. Required Submittals

RSN

Clause or

Section Title Submittals Required

Due date or delivery time

Responsible Code

No. of sets to be sent to: **

CO OGR COR QAE

2.01-1 Mobilization and Site Use

Site Hookup Schematic

Within 21 days after receipt of Notice to Proceed OGR 1 1 1 1

2.01-2 Pilot Operation

Contractor Operation Manual

Within 21 days after receipt of Notice to Proceed OGR 1 2 1 1

Statement of Work

2.01-3

Quality Assurance and Quality Control

Trended Data Sampling Plan

Within 21 days after receipt of Notice to Proceed QAE 0 1 0 1

2.01-4 Mobilization and Site Use

Provisions to Prevent Freezing

Within 21 days after receipt of Notice to Proceed COR 1 1 1 1

6.01-1 Site Security and Access

Personnel and equipment list

Submitted and accepted by OGR before commencing onsite work OGR 1 1 1 1

7.02-1 Safety Data Sheets

Complete LHM and SDS

At least 14 days before jobsite delivery of hazardous material not previously listed COR 1 1 1 1

7.02-2 Safety Data Sheets

Complete LHM and SDS

At least 14 days before jobsite delivery of hazardous material not previously listed COR 1 1 1 1

7.03-1 Safety and Health

Safety Program

Submitted and accepted by OGR before commencing onsite work OGR 1 1 1 1

7.03-2 Safety and Health JHA

Submitted to OGR at least one business day prior to start of work OGR 0 1 0 1

7.03-3 Safety and Health

Monthly Accident Summary Report

First day of the month COR 1 1 1 1

** CO indicates Contracting Officer, OGR indicates On-site Government Representative, COR indicates Contracting Officer Representative, and QAE indicates Quality Assurance Evaluator