DDW-2024-012636

October 29, 2024
Jack Lytle
Dutch John Water System
P.O. Box 219
Manil, Utah 84046
Subject:Plan Approval, Dutch John Membrane Plant (TP002);
Dutch John Water System, System #05001, File #13036, SRF #3F1857
Dear Jack Lytle:This letter provides a summary of the Division of Drinking Water’s decision to issue Plan Approval for the Dutch John Membrane Plant (identified as TP002 in the Division’s
database). The letter includes the following sections and addenda:Plan Approval for Dutch John Membrane Plant (TP002)Project Overview (Addendum 1), which provides detailed description
of the proposed treatment plant design.Proposed Strategy for Achieving Surface Water Treatment Goals (Addendum 2), which describes the proposed strategy for achieving the required treatment
goals.Preliminary Summary of Surface Water Treatment Monitoring and Reporting Regulations (Addendum 3), which may be useful for this plant’s PLC and SCADA programming.
We have completed our review of the plans and specifications of the proposed Dutch John Membrane Plant (TP002) stamped and signed by Aaron Averett, P. E., and dated October 1, 2024,
and find they basically comply with the applicable portions of Utah’s Administrative Rules for Public Drinking Water Systems in R309. On this basis, the plans for the construction of
Dutch John Membrane Plant (TP002) are hereby approved.
This plan approval pertains to construction only. An Operating Permit must be obtained from the Director before Dutch John Membrane Plant may be put into service. A checklist outlining
the items required for issuing an Operating Permit for this treatment plant is enclosed for your information.Approvals or permits by local authority or county may be necessary before
beginning construction of this project. As the project proceeds, a notice of any changes in the approved design, as well as any change affecting the quantity or quality of the delivered
water, must be submitted to the Division. We may also conduct interim and final inspections of this project. Please notify us when actual construction begins so that these inspections
can be scheduled.
This approval must be renewed if construction has not begun or if substantial equipment has not been ordered within one year of the date of this letter.The project, as described herein,
is generally eligible for assistance under the Drinking Water Construction Assistance Program. All change orders will need to be reviewed and approved for compliance with the Drinking
Water Rules and the conditions of this construction approval.The project may now be advertised for bids. But, as a condition of the project funding, you must not award the contract or
proceed with construction until the Division of Drinking Water has authorized you to do so. This is necessary to comply with applicable requirements and to protect you, as the funding
recipient, by ensuring that the contract meets requirements for funded projects. Federal regulations require that a concerted effort must be made to encourage participation of small
and disadvantaged business enterprises (DBE) by providing requisite information, including plans and specifications on the project. In order to provide opportunities to DBE subcontractors,
utilization goals for Minority-owned Business Enterprises (MBE) and Women-owned Business Enterprises (WBE) have been determined to be 4% and 2%, respectively. As outlined in the contract
documents, the prime contractor must submit a list of prepared MBE/WBE subcontractors to be used on this project and documentation of solicitation efforts with the bid. The prime contractor's
efforts to provide opportunity to DBE's must be reviewed and approved by this office before the contract can be awarded.
If you have any questions regarding this approval, please contact Julie Cobleigh, of this office, at [phone], or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
JJC/mrn/mdbEnclosuresOperating Permit ChecklistAddendum 1. Project OverviewAddendum 2. Proposed Strategy for Achieving Surface Water Treatment GoalsAddendum 3. Preliminary Summary of
Surface Water Treatment Monitoring & Reporting Regulationscc:Cindy Austreng, Tri-County Health Department, [e-mail] Hall, P.E., District Engineer, [e-mail]
Averett, Sunrise Engineering, [e-mail] Lytle, Dutch John Town Water System, [e-mail] Page, PhD, Division of Drinking Water, [e-mail]
Cobleigh, P.E., Division of Drinking Water, [e-mail] Pattee, Division of Drinking Water, [e-mail]
Nathan Lunstad, P.E., Division of Drinking Water, [e-mail]
Mark Berger, Division of Drinking Water, [e-mail]
John Steffan, Division of Drinking Water, [e-mail]
jcobleigh 05001 13036 Dutch John WTP PA
Utah Division of Drinking Water ― Checklist for Issuing Operating PermitsWater System Name: ______________________________System Number: _______________Project Description: _______________________________File
Number: __________________
Items 1 through 11 below must be submitted to the Division and found to be acceptable prior to operating permit issuance (unless a water line project meets the requirements of R309-500-7
and is not required to obtain an Operating Permit).☐1.Certification of Rule Conformance by a professional engineer (P.E.) that all conditions of Plan Approval were accomplished, and
if applicable, changes made during construction were in conformance with rules R309-500 through 550☐2.As-built or record drawings incorporating all changes to approved plans and specifications
(unless no changes were made to the previously approved plans during construction)☐3.Confirmation that as-built or record drawings have been received by the water system☐4.Satisfactory
bacteriological samples as evidence of proper disinfection and flushing in accordance with the appropriate ANSI/AWWA standards:
☐ANSI/AWWA C651-14 AWWA Standard for Disinfecting Water MainsTwo consecutive sample sets at least 16 hours apart, nonpositive (e.g., every 1,200 feet, end-of-line, each branch)☐ANSI/AWWA
C652-11 AWWA Standard for Disinfection of Water-Storage Facilities (e.g., clearwell, storage tank).One or more samples, nonpositive☐ANSI/AWWA C653-13 AWWA Standard for Disinfection of
Water Treatment PlantsTwo consecutive samples per unit (filter), nonpositive, no less than 30 minutes apart☐ANSI/AWWA C654-13 AWWA Standard for Disinfection of WellsTwo consecutive samples,
nonpositive, no less than 30 minutes apart☐5.Water quality data —
New source chemistry data on combined raw water (with recycle) and finished water (one sample each)
IFE, CFE and clearwell turbidity (highest reading at 4-hour intervals for a minimum of 7 days)
Minimum chlorine residual, pH and temp, min. volume for detention time calculations (daily for a minimum of 7 days)
☐6. If applicable, all other documentation that may have been required during the plan review process.☐7. SWTR monthly report with at least 7 days of operational data demonstrating SWT
has been achieved. The WTP does not have to operate at full capacity or continuously (but at least 4 hours per day) for the purpose of this demonstration.☐8. Confirmation of turbidimeter
calibration.☐9. For membrane treatment:a statement of knowledge that the facility startup of Subsection R309-530-8(9) has been completed.normalized operating flux range.normalized operating
flux per membrane unit.maximum operating differential pressure for a membrane unit.membrane unit backwashing frequency.minimum, verified, operation, direct integrity testing resolution.maximum,
verified, operational, direct integrity testing sensitivity.verified, operational, direct integrity control limit.verified, indirect integrity monitoring performance-based upper control
limit.☐10.If applicable, confirmation that the water system owner has received the O&M manual for the new facility.☐11.If applicable, the location data of the new storage tank, treatment

facility, or sourceADDENDUM 1Project Overview
Dutch John Water System (UTAH#05001)
Dutch John Membrane Plant (TP002)
Project History
The Division of Drinking Water (the Division) received the plans and specifications of the proposed Dutch John Membrane Plant, stamped, and signed by Aaron Averett, P. E., and dated
June 27, 2024, on August 6, 2024. Review comments were provided on August 23, 2024, and revised plans were received on September 20,2024. The Dutch John Membrane Plant is identified
as TP002 in the Division’s database.
Project Summary
It is our understanding that the proposed Dutch John Membrane Plant (identified as TP002 in the Division’s database) will treat water from the Flaming Gorge Reservoir (WS001) and replace
the existing Flaming Gorge WTP (TP001). The Dutch John Town Water System conducted a pilot study from June 16, 2023 to September 4, 2023, to verify performance and suitability of a WesTech
membrane filtration system using a Toray HFUG-2020AN UF module followed by granular activated carbon (GAC) filtration. The Division concurred with the Preliminary Design Report on May
15, 2024.The proposed Dutch John Membrane Plant (TP002) is a surface water treatment plant consisting of ultrafiltration, granular activated carbon filtration and post-chlorination processes.
The Dutch John Membrane Plant (TP002) has a plant design capacity of 125 gallons per minute (gpm). The design includes 2 train(s) of ultrafiltration and GAC processes, with the design
capacity for each train of 125 gpm.The proposed treatment plant consists of the following processes in sequence:1-MG Raw Water Storage Tank (Plan Approval issued under File #13228)
200 Micron pre-screen each skid
Compliance Filters– WesTech Alta Pac membrane skid; Toray HFUG-2020AN ultrafiltration modules; 2 membrane trains; 6 modules installed per train (6 more could be added per skid);125 gpm
per train based on 6 modules.
Post compliance filters - 2 AquaSorb 3500 Granular Activated Carbon filters in parallel for total organic carbon (TOC) removal. NSF on media and vesselPost-chlorination – sodium hypochlorite
injection directly after the GAC filtersOrthophosphate addition for corrosion controlExisting 8-inch diameter pipeline segment and 500,000-gallon tank (ST004) for disinfection CT before
releasing the finished water to the distribution system.Monitoring and Reporting locations:
Raw Water Sampling Locations and Analyzers:
Sample taps on the influent and effluent of the 1 MG raw water tank
Hach Brand, Model LXV445.99.21112 Turbidimeter
Hach Brand, Model LXV525.97KT0020 pH and Temperature analyzers
Octave Ultrasonic Model, MasterMeter Brand Flow Meter
The Dutch John Membrane Plant water will recycle analyzer water from a 200-gallon recycled water tank to the 1-MG raw water tank and will total a very small percentage of the total flow
(~0.23%).
Individual Filter Effluent (IFE) Turbidimeter and Flow Meter on Each Skid:
Hach Brand, ModelTU5300 Turbidimeter
SitransBrand, FM MAG 5100 W Model Flow Meter 
No combined filter effluent (CFE) turbidimeter at this time. This will be required if additional skids are added.
GAC effluent turbidity meter:
Hach Brand, Model LXV 445.99.21112
Analyzers for Primary Disinfection and POE chlorine residuals will be taken from the 1-inch sample line off the 500,000-gallon storage tank (ST004) and include Hach Brand, Model CLF10SC
chlorine residual analyzer, Hach Brand, Model LXV525.97KT0020 pH and Temperature analyzer.ADDENDUM 2Proposed Strategy for Achieving Surface Water Treatment Goals
Dutch John Water System (UTAH#05001)
Dutch John Membrane Plant (TP002)Treatment Goals per Surface Water Treatment Rules
The Dutch John Membrane Plant (TP002) consists of ultrafiltration, granular activated carbon filtration post-chlorination processes. This plant shall be designed to meet the requirements
of the surface water treatment rules, as incorporated into Utah’s Rules in R309. These surface water treatment rules require removal and/or inactivation, expressed in terms of log10
credit, of Cryptosporidium, Giardia lamblia, and viruses through treatment techniques. The Surface Water Treatment Rule (SWTR) requires:3-log removal/inactivation for Giardia lamblia,
and4-log removal/inactivation for virus.
The Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR) established four bin classifications for Cryptosporidium based on concentration in the source water. If a water system
has source water classified in Bin 1, LT2ESWTER requires 2-log removal forCryptosporidium. If a water system has source water in Bin 2, Bin 3, or Bin 4, LT2ESWTR requires additional
treatment, disinfection, or inactivation for Cryptosporidium, as outlined in EPA’s “Long Term 2 Enhanced Surface Water Treatment Rule Toolbox Guidance Manual.”
The water source supplying this treatment plant is the Flaming Gorge Reservoir (WS001). Per the Division’s letter issued on November 20, 2018, the raw water source for this plant has
been determined to be in Bin 1 based on the second round of sampling under LT2ESWTR. The Dutch John Membrane Plant (TP002) water treatment plant is designed to meet the Bin 1 requirements,
i.e., 2-log10 removal for Cryptosporidium.
In the event additional log removal credit is needed for a higher Bin classification, additional treatment will need to be installed. New Plan Approval would be required for any additional
treatment.Proposed Strategy to Comply with Surface Water Treatment RequirementsPrimary FiltrationThe proposed Dutch John Membrane Plant (TP002) will be using a WesTechAltaPac Membrane
Filtration System with Toray HFUG-2020AN ultrafiltration modules, for primary filtration, followed by GAC for TOC removal. The Toray membranes are skid mounted, with two membrane trains
for the system. According to the Acceptance Letter of the Toray HFUG-2020AN membrane filtration module dated October 31, 2022 from the Colorado Department of Public Health and Environment,
the Toray HFUG-2020AN ultrafiltration module is credited for providing 3-log10 removal for Giardia lamblia and 3- log10 removal for Cryptosporidium if the process is operated such that
a maximum flux of 120 gal/ft2/day and a maximum trans-membrane pressure of 29 psi is not exceeded. The Division concurs with this determination.Please note that the turbidity performance
standards for the proposed treatment plant will be less than 0.1 NTU 95% of the time and shall not exceed 0.5 NTU (per R309-200-5(a)(ii) and R309-530-9).
Disinfection
A sodium hypochlorite disinfection process will be added following the ultrafiltration and GAC filters to provide additional treatment to complete the primary disinfection treatment
required to meet the 4-log10 removal/inactivation for virus treatment goal for compliance with the Surface Water Treatment Rules. A disinfection CT (CT = Concentration × Contact Time)
of 12 is needed to achieve the required 4-log10 inactivation for virus at a water temperature of 0.5 oC and pH range of 6-9. Note that a different CT value is required for varying pH
and temperature values.
The disinfected water will go through 150 feet of 8-inch diameter pipe (392 gallons) to the existing 500,000-gallon storage tank (ST004) and then to the distribution system. Based on

the monthly reports for the current treatment plant, using a minimumfree chlorine residual of 1.0 ppm at the sample line off the tank, a pipe volume of 392 with baffling factor of 1,
a minimum tank volume of 120,691gallons with a baffling factor of .3, and a peak flow rate of 125 gpm, an estimated disinfection CT of 293 will be provided, which meets the 4-log virus
inactivation requirement.
The Point of Entry (POE) sampling location for the Dutch John Membrane Plant (TP002) will be the 1-inch sample line off the 500,000-gallon tank (ST004).
Overall, the proposed design of the Dutch John Membrane Plant (TP002) is anticipated to meet the required treatment for Cryptosporidium for surface water classified as in Bin 1 under
R309-215-15 of Utah’s Rules. The processes of ultrafiltration and the post-chlorination together will achieve the treatment goals of:
3.0-log removal required for Giardia lamblia,
2.0-log removal required for Cryptosporidium (Bin 1 requirement), and
4.0-log inactivation for virus.
ADDENDUM 3
Preliminary Summary of Surface Water Treatment Monitoring and Reporting Regulations
Dutch John Water System (UTAH#05001)
Dutch John Membrane Plant (TP002)
This addendum summarizes the monitoring and reporting regulations related to the Dutch John Plant (TP002). It is provided to you for informational purposes only and may be helpful in
PLC and SCADA programming after the plant is constructed.
The actual monitoring and reporting requirements for this treatment plant will be provided to the water system by staff of the Division of Drinking Water with the issuance of the Operating
Permit.
Monthly Report — General
The Dutch John Water System (the System) is required to complete a monthly report for the Dutch John Membrane Plant using a template developed by the Division of Drinking Water (the
Division). As a minimum, the monthly surface water treatment plant report must include the following data and other applicable information.
Raw water pH, Temperature, turbidity, and flow rate. [R309-530-8(8)(p) and (q)]
Combined filter effluent (CFE) turbidity [R309-215-9(1)(a)]
Minimum chlorine residual of the treated water at the point of entry (POE)
Verification and calibration dates of turbidimeter(s)
Sufficient residual concentration, volume, flow, pH, and temperature readings in order to prove disinfection CT and/or Inactivation ratio demonstrating whether the log removal/inactivation
requirements are met R309-200-5(7), R309-215-15(19);
Summary of the daily direct integrity test, continuous indirect integrity test, and triggered direct integrity test results [R309-215-15(18)(b)]
Individual Filter Effluent (IFE) Flow rates. [R309-215-8(2)]
The System will be required to submit the surface water treatment plant report for the entire month to the Division by the 10th of the following month. This report must be submitted
by e-mail as an Excel file [e-mail]. Please contact Sarah Page [phone] or [e-mail] to schedule training regarding proper reporting.
All operational records pertaining to the monthly surface water treatment plant reports shall be maintained for a minimum of 5 years [R309-105-17].
Treatment Adequacy [R309-200-5(7), R309-215-15(19) and (20)]
Water systems using surface water or groundwater under the direct influence of surface water must provide treatment consisting of both disinfection and filtration. [R309-200-5(5)(a)].
The surface water treatment plant monthly report must include both disinfectionand filtration processes. The monthly report shall contain sufficient information to indicate whether the
minimum surface water treatment requirements (i.e., log removal/inactivation of Giardia, virus, and Cryptosporidium) are met.
Required Treatments Credit — The treatment credits required and granted for the processes in Dutch John Membrane Plant (TP002) are summarized below.
Dutch John Water System (UTAH#05001)
Dutch John Membrane Plant (TP002)
Primary Treatment Technique: Membrane Filtration
Treatment Goals
(Minimum Treatment Requirements)
Giardia
Virus
Cryptosporidium
Processes
3.0-log removal / inactivation
4.0-log removal / inactivation
2.0-log removal
(Bin 1 source water)
Credit Granted
Toray HFUG-2020AN Ultraf Filtration1
3.0-log removal
3.0-log removal
Chlorine2
4.0-log inactivation
Total Treatment Credit
3.0-log removal
4.0-log inactivation
3.0-log removal
Granted based on the State of Colorado Department of Public Health and Environment Acceptance letter dated October 31, 2022.

Based on estimated CT calculations using both existing plant and new plant design conditions.
Disinfection
The System is required to continuously disinfect the treated water from this WTP.
The disinfection treatment shall be sufficient to ensure the total treatment processes of this WTP achieve at least 3.0-log inactivation/removal of Giardia lamblia, 4.0-log inactivation/removal
of virus, and a minimum of 2.0-log Cryptosporidium removal (for treating Bin 1 source water). [R309-200-5(7)(a)(i); R309-215-15(12)].
The calculated disinfection CT for all processes shall be reported monthly to indicate the level of disinfection effectiveness. [R309-215-15(19)]
Disinfection at Point of Entry (POE)[R309-200-5(7), R309-215-15(19)]
The System is required to continuously disinfect the treated water from this WTP. [R309-200-5(7)]
The chlorine residual must not be below 0.2 milligram per liter (mg/L) free chlorine residual at the POE, where the treated water enters the distribution system, for more than four hours.
[R309-200-5(7)(a)(ii)]
The chlorine residual must not exceed the maximum residual disinfectant level (MRDL) of 4.0 mg/L free chlorine residual. [R309-200-5(3)(c)(iv) Table 200-5]
Lowest Daily POE chlorine residual readings shall be collected and recorded on the monthly report [R309-215-10(1) Table 215-2].
Systems serving a population less than 500 shall either continuously monitor chlorine residuals at the POE or collect 1 grab sample per day.
The chlorine analyzer should be verified for accuracy or calibratedat least quarterly per Standard Method 334.0 Determination of Residual Chlorine in Drinking Water Using an Online Chlorine
Analyzer. [EPA 815-B-09-013 September 2009 11.1.1.2 Page 13]
A Hach Pocket Colorimeter DPD colorimetric method (e.g. Method 8021) is an acceptable method for verifying on-line chlorine residual analyzers (e.g. for Hach Cl17 online analyzer). If
the verification fails, online analyzer adjustments will be made until the accuracy is achieved. A calibration will be conducted if verification testing cannot be accomplished successfully.
Turbidity Limit Issues
Filtration Technologies Other Than Conventional Filtration, Direct Filtration, Slow Sand Filtration, or Diatomaceous Earth Filtration [R309-200-5(5)(a)(ii); R309-215-9(1)]
The turbidity of the treated water or the combined filter effluent (CFE) shall be less than or equal to 0.1NTU inat least 95% of the measurements taken each month. The treated water
or CFE turbidity shall at no time exceed 0.5 NTU.
Turbidity Monitoring and Reporting — GeneralThe turbidity readings during the operation and maintenance procedures, such as plant start-up, clean-in-place, enhanced flux maintenance,
air scrub, integrity tests, etc., can be excluded from the report. Operational logs and/or SCADA shall reflect the conditions causing false turbidity readings.If a data recording delay
is programmed into SCADA after plant start-up, the delay shall not exceed 15 minutes, and the System shall inform the Division of the programming details.Signal averaging is not allowed.The
turbidity of the combined filter effluent (CFE) and each individual filter effluent (IFE) shall be continuously monitored. [See R309-215-9(1)(a) for CFE monitoring, and R309-525-15(4)(b)(vi)
and (4)(c)(vii) for IFE monitoring.]The turbidity of the combined filter effluent (CFE) and each individual filter effluent (IFE) shall be continuously recorded. [R309-215-9(1)(b)]The
System shall monitor the turbidity results of each IFE at a frequency no greater than every 15 minutes. [R309-215-9(1)(b)]The highest CFE turbidity reading at the end of eachfour-hour
(or shorter) intervalof operation must be included in the monthly surface water treatment plant report submitted to the Division, excluding data described in #5a. Data must be sufficient
to determine the information outlined below. [R309-215-9(1)(b); R309-215-9(1) (c), R309-215-9(4)(a) and R309-215-9(5)(a)]Total number of the 4-hour combined filter effluent (CFE) turbidity
measurements reported during the month (see #5e). The number and percentage of 4-hour combined filter effluent (CFE) turbidity measurements reported during the month, which are less
than or equal to 0.1 NTU, excluding data described in #5a.The date and value of any turbidity measurement taken during the month, which exceeds 0.5NTU for a System using membrane filtration.If
there is a failure in continuous monitoring equipment, the System shall conduct grab sampling for turbidity every four hours. [R309-215-9(1)(b)]
The grab sampling, in lieu of continuous monitoring, cannot be more than five working days for water systems serving a population of 10,000 or more, following the failure of equipment.
The grab sampling, in lieu of continuous monitoring, cannot be more than fourteen days for water systems serving a population of less than 10,000, following the failure of equipment.
If the set turbidity limit for the approved treatment technology is exceeded, the System must comply with the re-sampling and notification requirements. [R309-215-9(2)]
Re-sample as soon as practicable and preferably within one hour.
If re-sampling confirms the exceedance of the turbidity limit —
The System shall collect at least one bacteriological sample near the first service connection from the WTP within 24 hours of the turbidity exceedance. This sample result shall be included
in determining bacteriological compliance for that month.
The System shall report this turbidity re-sampling exceedance to the Director as soon as practical, but no later than 24 hours after the turbidity exceedance is known. This reporting
is in addition to reporting the incident on any monthly WTP reports.
The System shall inform the Division as soon as possible, but no later than the end of the next business day if at any time the combined filter effluent (CFE) turbidity in representative
samples of filtered water exceeds the maximum level set by the Director, i.e., 0.5 NTU for Dutch John Membrane Plant.[R309-215-9(6)(b)]
Turbidity Equipment Verification and Calibration
Continuous turbidity monitoring equipment for the combined filter effluent (CFE) and each individual filter effluent (IFE) shall be checked for accuracy and re-calibrated at a minimum
frequency of monthly. [R309-215-9(1)(d)]
The turbidimeter shall be calibrated andthe accuracy verified at least once per month.
The turbidimeters should be thoroughly cleaned and calibrated to primary standardsat least quarterly.
It is not allowed to calibrate online instruments by comparison with a bench-top turbidimeter.
The most recent verification/calibration date for the CFE turbidimeter and each IFE turbidimeter shall be reported in the monthly report.
Membrane Filtration — Direct Integrity Testing [R309-215-15(18)(b)(iii)]
The direct integrity test must be independently applied to each membrane unit in service.
The direct integrity test must have a sensitivity sufficient to verify the log treatment credit awarded. This sensitivity level or pass/fail criteria should be agreed upon by the Division
and the System based on the manufacturer’s recommendation or other testing.
The System must establish a control limit within the sensitivity limits of the direct integrity test indicative of an integral membrane unit capable of meeting the removal credit awarded.
If the result of a direct integrity test exceeds the control limit, the System must remove the membrane unit from service. The System must conduct a direct integrity test to verify any
repairs and may return the membrane unit to service only if the direct integrity test is within the established control limit.
A direct integrity test must be conducted on each membrane unit no less than once each calendar day of operation.
The System must submit a monthly report to the Director summarizing all excursions above the established control limit, the triggered direct integrity testing, and the action taken in
each case. [40CFR 141.721(f)(10)(ii)(B)]

Membrane Filtration — Indirect Integrity Testing [R309-215-15(18)(b)(iv)]
The System must conduct continuous indirect integrity monitoring (i.e., continuous filtrate turbidity monitoring) of individual membrane units (IFE) and combined filter effluent (CFE).
Continuous filtrate turbidity monitoring must be conducted at a frequency of no greater than once every 15 minutes. [40CFR 141.719(b)(4)(ii) and (iii)]
If the filtrate turbidity readings are above 0.15 NTU for a period greater than 15 minutes (i.e., two consecutive 15-minute readings above 0.15 NTU), excluding the data described in
#5a, direct integrity testing must immediately be performed on the associated membrane unit. [R309-215-15(18)(b)(iv)(D)]
Source Water Bin Classification
The source water (Flaming Gorge Reservoir, WS001) of the Dutch John Membrane Plant (TP002) has been classified as Bin 1 with respect to R309-215-15 after a second round of monitoring
completed September 30, 2018.