DDW-2024-013137

November 7, 2024
Jason Wayne Taylor
South Salt Lake City Water System
195 West Oakland Avenue
Salt Lake City, Utah 84115
Subject:Plan Approval, 300 E 3300S Phosphate Injection Station (TP017); South Salt Lake City, System #18032, File #16739
Dear Jason Taylor:
The Division of Drinking Water (the Division) received the plans and specifications for the proposed 300 E 3300 S Phosphate Injection Station (TP017) from your consultant Ben Miner of
Hansen, Allen & Luce Engineers on September 26, 2024. The update on the project design was provided to the Division on October 29, 2024. This project has met the conditions for receiving
plan approval.
Our understanding of the project is that South Salt Lake will construct a phosphate injection station at the existing Jordan Valley Water Conservancy District's metered connection to
South Salt Lake City's water system at 300 East 3300 South. The phosphate injection station will help the South Salt Lake sequester iron and reduce corrosion of the City's cast iron
pipe.
South Salt Lake City received complaints of red water in the past. The city believes that the red water complaints are attributed to seasonal changes to their source water from wells
to water provided by Jordan Valley Water Conservancy District (JVWCD) (WS010-Utah 18027 JVWCD). The well water has been treated with polyphosphates, while the water that JVWCD supplies
does not contain phosphate.
When the City uses well water, the polyphosphates create a film on the inside of unlined cast iron mainlines that prevent corrosion. In addition, there is a natural biofilm inside of
the pipeline that is believed to be using phosphates as a nutrient source. When the wells are shut off and JVWCD water fills the mainlines, the phosphate concentrations are absent, and
the biofilms no longer have a source of nutrients. In response, the biofilms slough off the walls of the pipeline and the iron corrosion starts to occur, which is the source of the red
water.
The City proposes utilizing a phosphate injection system to address the red water by maintaining the phosphate concentrations in their mainlines. The phosphate treatment would be applied
at 300 East 3300 South, where the JVWCD wholesale water connection exists. All water in the system would have phosphate treatment and would reduce the seasonal biofilm sloughing.
The Phosphate Injection (TP017) system would inject polyphosphate into drinking water at JVWCD metered connection located at 300 E 3300 S in SLC to ensure reduction of corrosion in City’s
iron pipeline. The phosphate solution is AmeriGuard 935, which is 50/50 orthophosphate and polyphosphate and is NSF60 certified. The dosing pump proposed is M2 FLEXFLO® Peristaltic Metering
Pump by Blue-White Industries.The phosphate dosing rate calculated is at 5 ppm ( 5 gallons of chemical per million gallons of water) coming from a 70 gallon phosphate solution tank.The
purpose of the proposed chemical treatment is to maintain the phosphate concentrations in South Salt Lake’s water mainlines.The feed rate is adjusted by the flow rate. The flow varies
from 400 gallons per minute (gpm) to 1000 gpm.
We have completed our review of the plans and specifications; stamped and signed byBen Miner, P.E., dated September 19, 2024,and find they basically comply with the applicable portion
of Utah’s Administrative Rules for Public Drinking Water Systems in R309. On this basis, the plans for 300 E 3300S Phosphate Injection Station (TP017) are hereby approved.
This plan approval pertains to construction only. An Operating Permit must be obtained from the Director before 300 E 3300S Phosphate Injection Station 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.Approval or permits from the local authority or the county may
be necessary before beginning construction of this project. As the project proceeds, 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.
If you have any questions regarding this approval, please contact Nagendra Dev, of this office, at (801) 68-5296, or me at [phone].
Sincerely,
Michael Newberry, P.E.
Permitting and Engineering Support Manager
ND/mrn/mdbEnclosuresOperating Permit Checklistcc:Matthias Neville, Salt Lake County Health Department, [e-mail] Wayne Taylor, South Salt Lake City W System, [e-mail]
Chris Merket, South Salt Lake City Water System, [e-mail]
Benjamin Miner, Hansen, Allen & Luce Inc., [e-mail]
David Kruse, Division of Drinking Water, [e-mail]
Dylan Martinez, Division of Drinking Water, [e-mail]
Nagendra Dev, Division of Drinking Water, [e-mail] 18032 16739 PA Phosphate Injection
Utah Division of Drinking Water ― Checklist for Issuing Operating PermitsWater System Name:System Number: Project Description:File Number:
Items 1 through 8 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, none positive (e.g., every 1,200 feet, end-of-line, each branch)☐ANSI/AWWA
C652-11 AWWA Standard for Disinfection of Water-Storage FacilitiesOne or more samples, none positive☐ANSI/AWWA C653-13 AWWA Standard for Disinfection of Water Treatment PlantsTwo consecutive
samples per unit, none positive, no less than 30 minutes apart☐ANSI/AWWA C654-13 AWWA Standard for Disinfection of WellsTwo consecutive samples, none positive, no less than 30 minutes
apart
☐5.Water quality data — Specify the required finished water and/or raw water data to demonstrate WTP performance before an OP can be issued, e.g., arsenic data/interval/frequency/sampling
location.☐6.If applicable, all other documentation that may have been required during the plan review process☐7.If applicable, confirmation that the water system owner has received the
O&M manual for the new facility☐8.If applicable, location data of new storage tank, treatment facility, or source