WB_JMMCRWRP_Scope_of_Supply_RO_Membranes.pdf

West Basin Municipal Water District Reverse Osmosis Membrane Elements February 2026

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EXHIBIT A: SCOPE OF SUPPLY

REVERSE OSMOSIS (RO) MEMBRANES

PART 1 – GENERAL

1.01 DESCRIPTION

A. The Juanita Millender-McDonald Carson Regional Water Recycling Plant (JMMCRWRP) has four reverse osmosis trains that treat tertiary effluent from the Edward C. Little Water Recycling Facility (ECLWRF) in El Segundo, California. This document pertains to the specification of reverse osmosis membrane elements for replacement of elements in two RO Trains at the JMMCRWRP.

B. The following items define the scope of work for this project:

1. Furnish a quantity of eight hundred fifty-two (852) membrane elements (8 x 40 inches) as specified in Part 2 of Scope of Supply, herein. Of this total, seven hundred and ninety-two (792) will be initially installed in the system, and sixty (60) will be spares.

2. Delivery –The completion time of the membrane replacement is paramount. The time of completion for the work will be Sixty (60) consecutive calendar days from the Notice of Award or no later than April 30, 2026, whichever is earlier.

3. Furnish new membrane element inter-connectors, end-cap adapters, O-rings for original installation and related spare parts, as specified in Part 2 of Scope of Supply, herein. All inter-connectors, end-cap adapters, O-rings and spare parts shall be fully compatible with Advanced Structures Codeline Model 80A45,6-element pressure vessels.

4. Provide technical data related to proper installation, operation, cleaning and storage of the products supplied.

5. Provide on-site representation during membrane installation (approximately one day per RO train) per section 3.03 below.

6. Provide a system performance warranty for all elements furnished in this contract, as specified in Section 1.05 below.

C. The membrane element manufacturer (herein called Supplier) shall furnish the membrane elements and appurtenances, in accordance with the requirements specified herein.

1.02 QUALITY CONTROL / QUALITY ASSURANCE

A. Reference Standards

1. American Society for Testing and Materials (ASTM)

a. ASTM-D4516

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b. ASTM D4194

c. ASTM D6161

d. ASTM D6284

2. American National Standards Institute (ANSI)/ National Sanitary Foundation (NSF) Standard 61

B. Manufacturers QA/QC

1. Membrane elements shall be manufactured in accordance with ISO/9000-9001.

C. NSF Certification

1. Requirements for NSF Standard 61 for membranes supplied shall apply to this specification.

1.03 SUBMITTALS

A. Shop Drawings

1. Membrane Supplier shall submit drawings and other information necessary to describe the membrane elements and related accessories, including:

a. Dimensions.

b. Weight.

c. Materials of construction.

d. Active membrane surface area.

e. Feed channel spacer thickness.

f. Standard performance parameters (including flow and salt rejection).

g. Standard application data including limits for pH, (operating and cleaning) temperature (operating and cleaning), maximum feed water flow, maximum feed water turbidity, maximum feed water SDI, applied pressure, differential pressure (element and vessel), chlorine tolerance, chloramine tolerance, and cleaning limitations.

h. Storage and handling requirements.

i. Commercial part numbers and standard O-ring size nomenclature for the elastomer interconnector O-rings and brine seals.

j. Material certification for elastomers provided as part of the specification.

k. NSF 61 Certification for the membrane and model provided.

2. Normalization equations used in factory (performance) testing.

3. Normalization equations used for calculation of system values including:

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a. Salt passage temperature correction factor

b. Water temperature correction factor

c. Normalization equation for system monitoring calculations including:

1) Net driving pressure,

2) Normalized differential pressure,

3) Normalized permeate conductivity.

4. Software projections of the membrane performance using year 0, 1, 3, and 5 year performance and the average conditions described in paragraph 2.01 and 2.02.

5. Software projections of the membrane performance using year 0, 1, 3, and 5 year performance and the average water quality and maximum temperature conditions described in paragraph 2.01 and 2.02

B. Factory Testing and Reports

1. Factory Testing

a. Subject to the requirements of section 3.01, Membrane elements shall be factory tested by the membrane supplier and signed test data for each membrane element shall be supplied to the District or its Representative prior to shipment (Refer to Paragraph 3.01).

b. The test data shall be accepted by the District or its Representative in writing prior to shipment.

C. Installation Instructions

1. The supplier shall provide installation instructions with the membranes.

2. If the supplier requires membranes to be installed in any particular matter, a loading schedule shall be prepared and delivered to the District by the supplier. Membranes shall be organized by rejection and/or productivity and delivered to the project site to facilitate installation.

1.04 OPERATION AND MAINTENANCE MANUALS

A. Provide 1 copy of printed materials, and an electronic file in (PDF) format.

B. Provide technical data related to proper installation, operation, cleaning and storage of the products supplied.

C. Provide standard operating and maintenance data and instruction sheets for the membrane elements, covering such topics as recommended cleaning solutions as well as long and short-term storage protocols.

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1.05 WARRANTY

A. The Membrane Supplier shall furnish a separate warranty for the RO membrane elements.

This warranty must be signed by an individual authorized to execute contracts on behalf of the Membrane Supplier and shall state the following provisions with no additional conditions or exceptions:

1. The Membrane Supplier shall warrant the performance of the membrane elements for a period of three (3) years from the start of System Performance Testing (30-day acceptance test). The Membrane Supplier shall warrant the membrane elements during that three (3) year period in accordance with the performance requirements specified herein and the following prorated replacement conditions if the elements fail to meet the warranted performance.

a. Elements shall be free of defects in workmanship and materials.

b. During the warranty period, permeate conductivity will be continuously monitored and periodically normalized. Conductivity profiling of vessels is also performed periodically. Routine sampling of feed, concentrate and permeate for ionic constituents is also performed.

c. Upon installation the initial membrane performance for salt passage shall be within 20 percent of the projected values.

d. During the warranty period, the individual element sodium rejection or chloride rejection shall remain greater than 99.0 percent when tested under standard conditions.

The above criteria shall not apply for a period of one week after membrane installation or cleaning to allow the membrane performance to stabilize.

2. The warranty shall commence on the date that System Performance Testing begins as described in 3.03.F.

3. In the event of a warranty claim, a conductivity profile will be used to assess the condition of the membrane and determine if the loss of rejection is localized or across the entire unit.

a. Individual vessels that exhibit loss of integrity by greater than 50 percent of the median conductivity shall have elements probed and/or removed and tested.

b. If the conductivity profile suggests that the loss of integrity is not localized, a minimum of 5 elements shall be removed and witness tested by the manufacturer or independently by a third party to determine the unit performance. If the average of the 5 elements is less than the lower limit, the remaining elements in the units shall be eligible for replacement under the warranty.

B. The warranty conditions specified above shall be valid under the following conditions:

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1. The RO system has been operated as designed in terms of product water recovery, array configuration, and feed water pH.

2. The feedwater has not contained chemicals that chemically or physically destroy the elements.

3. The elements are periodically cleaned with an effective cleaning solution to remove membrane foulants.

4. The elements are cleaned using standard cleaning solutions prior to performance testing for warranty purposes.

5. Biological matter or sparingly soluble substances in the feed water have not irreversibly fouled the elements.

6. Should the RO unit performance not meet the warranty requirements, the Membrane Supplier shall provide sufficient replacement elements to achieve the specified unit performance.

7. After successful completion of the System Performance Test (30-day acceptance test), the replacement elements will be provided at the original purchase price, less a credit of 1/36 of the purchase price for each unused month of the warranty period.

The Membrane Supplier shall warrant that future replacement elements will be sold to the District at a price not to exceed 15 percent above the original purchase price per 40-inch element at any time within three years from acceptance of the RO membrane elements.

1.06 PRODUCT DELIVERY STORAGE AND HANDLING

A. Membranes, interconnector and brine seal sealed in a heavy bag. Performance (wet) tested membranes shall include sodium bisulfite solution as a preservative. Other inorganic preservatives or non-organic based preservatives will be considered on a case-by-case basis. However, the use of organic based solution preservatives is not acceptable.

B. Membrane Elements shall be supplied in a cardboard box which is constructed from 180 lb/1000ft2 cardboard. The packaging shall contain spacers to center and secure the membrane element in the box. The membrane model and serial number shall be displayed on the box.

C. If applicable, membrane elements shall be organized in accordance with the membrane suppliers loading schedule and serial number.

D. Membrane boxes shall be palletized and shrink wrapped for shipment.

E. For orders in excess of 100 elements, the District will consider alternative packaging approaches to eliminate cardboard and packaging waste.

F. Membranes shall be transported to the jobsite using methods to prevent freezing.

PART 2 – PRODUCTS

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2.01 PROCESS SYSTEM DESIGN AND PERFORMANCE

A. Juanita Millender-McDonald RO Trains

1. The feedwater to each RO system will be a secondary effluent municipal wastewater that has been further pretreated as shown in Figure 1. Avista Technologies Vitec 1400 is dose at a rate of 1-1.5 mg/L to prevent precipitation of sparingly soluble salts.

Sulfuric acid is added to maintain a pH of 6.8 ahead of Trains 1-4. Table 1 lists the 2025 water quality analyses for the RO feedwater after chemical addition.

Figure 1- JMMCRWRP Process Flow Diagram

2. The RO system consists of four trains in parallel. This Scope of Supply pertains to the replacement of all membranes in two of the four RO Trains.

3. The trains each consist of 66 eight-inch diameter pressure vessels, configured in a 36:20:10 array. Each vessel contains six (6) spiral-wound 8-inch diameter by 40-inch-long membrane elements. There are 396 elements per train.

4. The design permeate flow for each train is one million gallons per day (1.67 mgd, 1160 gpm) at 85 percent recovery. Figure 1 indicates the pretreatment process.

5. Based on a nominal active membrane element area of 400 square feet per RO element, the average operating flux is approximately 10.54 gallons per square foot per day (gfd).

6. Each train has a dedicated R.O. feed pump equipped with a variable frequency drive.

The maximum available pump discharge pressure is approximately 300 psig.

B. ClP System and Procedures

1. Each unit is connected to a CIP system. The CIP system has been designed to provide a minimum of 40 gpm per vessel at 60 psi of pressure. Cleaning may be performed up to 3 times per year under the following conditions.

a. Water: RO Permeate

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b. Chemicals

1) Sodium Tri Poly Phosphate (STPP) (1-2.5 percent)

2) Sodium Dodecyl Benzene Sulphonate (SDDBS) (0.1 to 0.25 percent)

3) pH adjustment (up to 12.0)

c. Duration

1) 3.5 total hours circulation,

2) 3 total hours soak,

3) 15-min flushing

d. Temperature

1) 38 degrees C. maximum

e. The District may use proprietary chemical formulations specifically designed for the cleaning of polyamide RO membranes at the time, temperature and concentration limits provided by the supplier without voiding the membrane warranty. West Basin currently uses AWC-227 and PWT Lavasol V as proprietary cleaning chemicals.

f. The District may use membrane supplier approved chemicals and formulations designed for the cleaning of RO polyamide membranes at the time, temperature and concentration limits provided by the membrane supplier without voiding the membrane warranty.

g. Other cleaning regimes may be used on a case-by-case basis. The District will notify and obtain approval for the use of alternative cleaning procedures with the membrane supplier if required to maintain warranty.

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C. Feed Water Quality

Table 1: JMMCRWRP RO Feedwater Quality Basis for Design

Constituent Units Average Range

Temperature °F 78 67 - 80 pH Units 7.0 6.8 - 7.1

Total Dissolved Solids mg/L 1,015 832 - 1,110

Bicarbonate (as CaCO3) mg/L 237 183 - 262

Chloride mg/L 301 240 - 350

Sulfate mg/L 132 101 - 164

Sodium mg/L 182 150 - 216

Calcium mg/L 47 41 - 53

Magnesium mg/L 26 22 - 29

Total Hardness (as CaCO3) mg/L 224 202 - 252

Potassium mg/L 20 16 - 25

Silica mg/L 17 13 - 18

Ammonia (NH3 as N) mg/L 39 30 - 46

Nitrate (NO3 as N) mg/L 2.57 1.15 - 5.20

Nitrite (NO2 as N) mg/L 1.57 0.24 - 3.03

Total Nitrogen (as N) mg/L 42.2 32.4 - 48.4

Total Organic Carbon mg/L 10 5 - 12

Residual Chloramine mg/L 3 1 - 5

Silt Density Index Units <3.0 0 - 3

Turbidity NTU 0.08 0.02 - 0.86

D. Performance and Filtered Water Requirements

1. Individual membrane elements shall retain a minimum sodium chloride rejection above 99 percent when measured under standard test conditions and achieve the following unit performance objectives.

2. JMMCRWRP Permeate Water Quality Requirements (normalized)

JMMCRWRP RO Permeate (Instantaneous)

Hardness ≤ 0.35 mg/L*

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Ammonia ≤ 5 mg/L* Silica ≤ 2 mg/L* Total Dissolved Solids ≤ 50 mg/L* Iron ≤ 0.15 mg/L* Electrical Conductivity ≤ 100 mg/L**

* Grab sample **Online Analyzer

JMMCRWRP RO Permeate (Rolling Average) Hardness ≤ 0.25 mg/L (3 day)* Ammonia ≤ 4 mg/L (3 day)* Silica ≤ 1 mg/L (12 week)* Total Dissolved Solids ≤ 35 mg/L (12 week)* Iron ≤ 0.10 mg/L (12 week)* Electrical Conductivity ≤ 70 mg/L (3 day)**

* Grab sample **Online Analyzer

3. Membranes shall be provided that meet the performance criteria described in Section

2.02 and as indicated by the membrane supplier’s projection software.

2.02 PRODUCT DESIGN AND FABRICATION

A. General

1. All products furnished under this specification shall be new and standard products of a manufacturer, regularly engaged in the manufacture of the products to be furnished.

2. The membrane supplier shall maintain offices and service facilities in the United States.

3. The membrane elements shall be fully compatible with the pressure vessels.

4. Membranes shall be limited to the models and manufacturers listed as it is acknowledged that the treatment of municipal wastewater effluents using some polyamide composite type RO membranes has resulted in unsustainable permeability and irrevocable fouling. Therefore, the specific membrane proposed shall have demonstrated competent performance in treating ECLWRF’s microfiltered secondary or tertiary effluent.

5. Pursuant to 2.02.A.4, the only acceptable membrane suppliers and models are listed below:

a. Toray - TM720D-400

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b. LG - BW400AFR

c. Hydranautics - CPA5-LD

B. Performance Requirements

1. Membranes provided shall satisfy the following operational limits.

a. pH, range (operating) 2-11

b. pH range (cleaning) 1-12

c. Free chlorine tolerance < 0.1mg/L continuous

d. Monochloramine tolerance <5.0 mg/L continuous

e. Maximum temperature (cleaning) 45oC

f. Max. feed water flow < 60 gpm

g. Max. element recovery 20 percent

h. Max feed water turbidity 1.0 ntu

i. Max. feed water SDI 3

j. Max. applied pressure <450 psi

k. Max. differential pressure (element) <10 psi

l. Max. differential pressure (vessel) < 50 psi

2. Performance Testing: Membranes shall be performance tested prior to shipment.

Performance testing shall demonstrate that individual and lot acceptance performance criteria shall be satisfied. The quantity of elements required to be tested is described in Section 3.01.A.

a. Performance shall be established by wet testing by the membrane supplier.

b. Testing shall be performed under the following conditions:

1) The test equipment instrumentation for data collection shall be configured such that there are no more than two elements in parallel or in series. Permeate flow from each membrane shall be individually measured.

2) The feedwater to each element shall contain between 1,500 and 2,000 mg/l of sodium chloride (as per manufacturer’s standard test conditions) and it shall be at a temperature of 25°C (77°F) with a pH of between 6.5 and 8.0. Testing procedures must comply with ASTM Method A, D4194-08 (2008) as described in State of California Groundwater Replenishment with Recycled Water 60320.201 a (1).

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Membrane rejection performance values may be higher than those stated above, and the values contained in this section shall apply.

3) The feedwater shall contain no foreign substance, such as large dye molecules, that will mask performance of the element.

4) The elements shall be under test at 225 psig (as per manufacturer’s standard test conditions) for a period of 30 minutes prior to data collection. (Any change in test duration shall be approved at the discretion of West Basin.)

5) The recovery for each element during the test shall be set at 15 percent.

3. Individual Element Performance Testing: When tested under these conditions, individual elements shall have rejection equal to or better than the rejection indicated, the productivity shall fall within the range specified, and the differential pressure shall be equal to or less than that specified below:

Supplier

Model No.

Productivity Range [gpd]

Minimum Rejection

Toray TM720D-400 9,900 – 12,100 99.65

LG BW400AFR 9,450 – 11,550 99.5

Hydranautics CPA5-LD 9,900 – 12,100 99.6

4. Lot Acceptance Performance Testing: The average performance of all the elements (lot acceptance) supplied under this specification shall meet the following minimum performance criteria:

Supplier

Model No.

Minimum Average Lot Productivity

[gpd]

Minimum Average Lot

Element Rejection

Toray TM720D-400 11,000 99.8

LG BW400AFR 10,500 99.6

Hydranautics CPA5-LD 11,000 99.7

C. Fabrication and Material Requirements

1. Membrane Element Construction

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a. The membrane shall be a composite structure consisting of a support material, a coarse base membrane and a fine “thin film” polymer membrane of polyamide composition.

b. The elements shall have nominal dimensions of eight inches in diameter and 40 inches in length. The active membrane area of the elements shall be 400 square feet.

c. The membrane elements shall be spiral wound with feed and concentrate flow through the element parallel to the permeate (product water) tube of the element.

d. The element permeate connection design and dimensions shall be the same for all elements supplied in this contract.

e. The feed/concentrate spacer material shall have a nominal thickness of

0.034 inches (based on product specification).

f. The membrane shall include a permeate collection spacer designed to transport water to the permeate tube.

g. The membrane edges shall be sealed or glued around the permeate collection spacer. If membranes are glued, the rolled membrane sheets shall be flush-cut through the cured glue line to prevent the formation of membrane flaps or separation of the membrane sheets at the feed and concentrate ends of the element.

h. Elements shall have a reinforced fiberglass outer wrap.

i. Elements shall use a nominal 1-inch diameter permeate tube.

j. The element serial number and direction of feed/concentrate flow shall be permanently affixed to the element.

2. Accessories

a. Each element shall be furnished complete with the following:

1) interconnector,

2) brine seal.

3. Materials

a. Each element shall be furnished complete with element-to-element interconnector, interconnector o-rings, and u-cup brine seal. O-rings and brine seals shall be constructed of 100% Virgin DuPont Dow VITON® fluoroelastomer Type B with 68 percent fluorine, with a durometer rating of 70 Shore A., and shall be standard products available from vendors other than the membrane manufacturer. Bidirectional brine seals made from high density polypropylene will be accepted. The elements shall be fully

A-13 compatible with Advanced Structures Codeline Model 80A45, 6-element pressure vessels.

2.03 SPARE PARTS

A. The Membrane Supplier shall furnish the following spare components, in addition to those required for original installation of the elements. Spare parts packaging shall indicate both an explicit written description (as shown below) and part number of the contents.

1. Ten (10) u-cup brine seals per train.

2. Twenty (20) O-rings for the element interconnectors per train.

3. Two hundred sixty-four (264) O-rings for seal between pressure vessel end adapters and element (if different from Item 2 above), per train.

4. One hundred thirty-two (132) O-rings for seal between pressure vessel end adapters and end cap, per train

5. Ten (10) element interconnectors, per train

6. One hundred thirty-two (132) pressure vessel end adapters, per train

7. Twenty (20) vessel head seals (8” nominal diameter)

3PART 3 – EXECUTION

3.01 MANUAFACTURING AND TESTING PRIOR TO SHIPMENT

A. Factory Testing

1. Membrane elements shall be factory tested by the Membrane Supplier.

2. Signed performance test data for each membrane element shall be supplied to the District or its Representative prior to shipment.

3. The performance test data shall be accepted by the District or its Representative in writing prior to shipment.

4. The District reserves the right to have a representative observe factory testing at any time during regular testing by the Membrane Supplier.

5. 100 percent of membrane elements shall be performance (wet) tested to satisfy Section 2.02.B unless the membrane supplier is able to provide information to support 5 percent performance (wet) testing described below.

6. 5 percent performance (wet) testing requirements:

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a. The membrane supplier shall demonstrate the following manufacturing and Quality Control practices to the satisfaction of the District.

1) Lot acceptance testing (flow/rejection) of membrane flat sheet media across the width and length of each production roll at predetermined intervals.

2) Automated membrane element (gluing and rolling) assembly.

3) Automated dimensional analysis of membrane element diameter and length.

4) Intermediate integrity testing of membrane subassemblies with air or vacuum based test methods.

5) Finished membrane element defect rates of less than 0.1 percent (1 in 1000)

6) 5 years minimum prior experience with the packaging and supply of dry membrane elements.

7) A statistical analysis of the performance wet test data to demonstrate within a 99 percent confidence interval that all membrane provided will satisfy the specified limits for salt rejection and productivity.

b. Membrane elements that are not wet tested by the Membrane supplier shall be packaged and shipped dry.

B. Performance Test Data

1. The signature for all test data shall be of the Membrane Suppliers quality control person responsible and witness to the testing of elements.

2. The test data shall be submitted at least 14 days prior to shipment of the membrane elements in Microsoft Excel spreadsheet format.

3. Raw test data shall be normalized to the reference conditions indicated. The membrane supplier shall provide the equations used for the normalization of test data.

4. The membrane supplier shall sign and submit test data for elements furnished as specified herein. The test data shall include productivity, salt rejection, and differential pressure for each element. The District reserves the right to waive any or all portions of the test data listed at its sole discretion.

5. The membrane supplier shall sign and submit lot acceptance average calculations for the membranes to be provided.

6. Membranes (individual or as a lot) which do not satisfy the stated performance criteria shall not be shipped.

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3.02 SHIPMENT, HANDLING, AND STORAGE

A. All equipment, including spare components, shall be delivered complete by the date required by the District.

B. Shipment shall be made only after the District’s written acceptance of Membrane Supplier’s factory test data.

C. Packing slips shipped with each container shall contain Material Safety Data Sheets (MSDS) indicating the properties and safe handling of chemical solutions entrained within the elements as a preservative.

D. The supplier shall provide packing information to the District prior to delivery. The supplier shall include WEIGHT, HANDLING INSTRUCTIONS, TYPE OF STORAGE REQUIRED, AND INSTRUCTIONS FOR PROTECTIVE MAINTENANCE DURING STORAGE WITH

EACH SHIPMENT TO THE PROJECT SITE.

E. Deliveries will be accepted at the treatment plant at the following location:

West Basin Municipal Water District Edward C. Little Water Recycling Facility

1935 Hughes Way El Segundo, CA 90245

F. Deliveries are accepted between the hours of 8:30 a.m. and 3:30 p.m. only, Monday through Friday. No deliveries will be accepted on Saturday, Sunday, or holidays. Prior to shipping, the Supplier shall contact West Basin to schedule the date and time of delivery.

G. The District shall store the membrane per the manufacturers requirements. If no requirements are provided, store membrane in a dry location temperature controlled between 40 and 110 degrees F.

3.03 INSTALLATION

A. The Membrane Supplier shall be present to ensure proper installation of membrane elements and to help evaluate initial operation of the system as it impacts the performance of the membrane elements.

B. District Responsibilities

1. The District is responsible for unloading existing membrane elements.

2. The District is responsible for any testing required before membrane installation.

3. The District is responsible for cleaning the pressure vessels.

4. The District will provide glycerine for use as a lubricant for installation.

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C. The Membrane Supplier shall visibly inspect each pressure vessel prior to membrane installation.

D. The Membrane Supplier shall instruct the District on the proper installation of membranes.

Installation shall include the lubrication of O-rings and seals and adapters using the lubricant provided by the District.

E. The Membrane Supplier shall record the vessel, position and serial number of membranes as they are installed into the pressure vessels. The data shall be provided to the District in an Excel (.xlsx) file format.

F. After Start Up and Flushing the membrane supplier shall perform the following:

1. The Membrane Supplier shall perform unit conductivity profiling and identify individual vessels which are producing permeate of unacceptable quality (vessels producing permeate with conductivity 40 percent higher than the median stage conductivity).

2. The Membrane Supplier shall identify these vessels and shall be present when the unit is taken off-line to inspect the off-spec vessels and help identify problems with element adapters, rolled brine seals, or other like causes.

3. The Membrane Supplier shall continue conductivity profiling and identification until all of the pressure vessels are conforming. Vessels that exhibit conductivity of greater than 30 percent of the median shall be remedied through seal replacement or membrane replacement until all vessels are less than 30 percent of the median.

4. If required, the Membrane Supplier shall perform single element testing questionable vessels to locate the problem area within the vessel using District provided test equipment. The membrane supplier may exchange installed membrane elements with spare membrane elements. Membrane elements that have been exchanged shall be replaced at no charge to the District.

G. The District shall normalize operational data for the RO Unit feed pressure required for production after 2 hours of operation shall be no more than 30 percent higher than the projected pressure required as indicated in the Year 0 projection.

H. Once the operating pressure and conductivity of the membranes has been determined to be acceptable, the membrane supplier shall provide written acknowledgment to the District that the membranes have been properly installed and are operating in a manner acceptable to the membrane supplier.

3.04 SYSTEM PERFORMANCE TESTING

A. Following installation of the membrane and receipt of the acknowledgment of proper installation and initial operation, a System Performance Test (30-day acceptance test) shall demonstrate successful operation of the membrane, at the design conditions equal to or less than the design limits for design flow and recovery.

1. Water quality and operational performance data shall be normalized to the design conditions using ASTM, membrane supplier provided, or other generally recognized

A-17 methodology agreeable to the District and membrane supplier and shall include a temperature compensation factor for salt rejection and water permeability. A single method shall be used and established prior to system performance testing. The parameters of specific flux, normalized differential pressure, and normalized permeate conductivity shall be calculated.

2. Membrane vessel integrity shall be established using conductivity profiling from pressure vessels weekly. Conductivity profiling will be performed by the District.

Permeate quality of vessels outside of a statistical sampling (a conductivity result greater than 40 percent of the median for vessels in the stage) shall be inspected and/or repaired to the satisfaction of the District.

3. The feed and permeate water quality shall be established using grab samples, based on the average of grab-samples taken once per week over the 30 days. This value will be used to establish the normalized permeate conductivity and average feed water quality. Normalized parameters shall be calculated using the average of the second, third and fourth sample (average initial water quality).

B. Successful completion of the acceptance test will be determined at the end of the System Performance Test (30-day acceptance test). Any observed deficiency in performance of the membrane elements shall be corrected to the satisfaction of the District at no additional cost to the District.

C. A deficiency is defined as the permeate water quality as having higher than projected levels of constituents. A deficiency in water quality occurs when the permeate water quality is greater than 20 percent higher than projected Year 0 water quality normalized to the design conditions for any of the following constituents.

1. Sodium

2. Chloride

END OF SECTION

C. The membrane element manufacturer (herein called Supplier) shall furnish the membrane elements and appurtenances, in accordance with the requirements specified herein.

2. American National Standards Institute (ANSI)/ National Sanitary Foundation (NSF) Standard 61