DWQ-2025-001922

UPDES INSPECTION SUMMARY and FINDINGS
Permittee Name:Cedar CityCorporation
Facility Name:Cedar CityRegional Wastewater Treatment Facility
Inspection Type:Compliance Evaluation Inspection
Permit Number: UT0024970
Start Date and Time: 21 February 2025, 09:00 AM
End Date and Time: 21 February 2025, 10:45 AM
Facility Location: 7218 North2300 WestCedar City, Utah
OVERVIEW
Jeff Studenka of the Division of Water Quality (DWQ) met with Eric Bonzo, Jeff Lennert and Pete Sury of the Cedar City Regional Wastewater Treatment Facility (Facility) to perform a
biennial UPDES Permit Compliance Evaluation Inspection (CEI). The purpose and scope of the inspection was explained, DWQ credentials were presented, the DWQ inspection checklist was
completed, and a full facility tour was conducted. There were no deficiencies noted from the last inspection (2-10-2023 CEI) that required follow up at this time.
PERMIT INFORMATION
Discharge
Receiving Waters:None (land applied effluent)
Permitted Outfalls:None (land applied effluent)
Permit Issuance Date:07/01/2023
Permit Expiration Date:06/30/2028
Treatment Design Flow:4.8 MGD
Biosolids
The permit includes provisions for Biosolids in Part III. The Facility has a Biosolids Program, which is inspected more thoroughly during separate DWQ Biosolids inspections. Therefore,
this was not discussed further as part of this CEI.
Pretreatment
The permit includes provisions for Pretreatment requirements in Part II. The Facility has been approved by DWQ to implement an Approved Pretreatment Publicly Owned Treatment Works Program.
This is inspected more thoroughly during separate DWQ Pretreatment inspections. Therefore, this was not discussed further as part of the this CEI.
Wastewater Collection System
Cedar City operatesand maintains the collection system separate from the Facility. Therefore, this was not discussed further as part of the CEI other than the MWPP information portion
of the CEI Checklist. Requirements regarding overseeing the collection system are included in the General Permit issued by DWQ Permit No. UTG580000. Additional information regarding
this permit can be found at:
https://deq.utah.gov/water-quality/utah-sewer-management-program-usmp
BACKGROUND/PROCESS INFORAMTION
Facility Process:The wastewater treatment process, beginning with the raw influent that flows into the Facility, consists of a headworks building with two mechanical fine screens, followed
by two aerated grit chambers, two primary clarifiers, two oxidation ditches, three final clarifiers, two anaerobic digesters, two chlorine contact chambers, along with nine drying beds
andthe dewatering screw press building for processing biosolids.
INSPECTION ACTIVITIES
Flow Measurements:Flow is continuously measured for both the influent and the effluent. The primary flow measuring device at the influent is an 18” Parshall flume with a corresponding
secondary measuring device (HACH SC200 ultra sonic meter). The primary flow measuring devices for the effluent are two 4.5’ rectangular concrete weirs, one for the south chlorine contact
chamber and one for the north chlorine contact chamber, and coming together into a single effluent discharge. Each weir is associated with a secondary flow measuring device (DrexelbrookUSonic-R
flow meters). On a regular and weekly basis, the Facility compares and records the difference in flow readings between the primary and secondary devices to confirm that they are consistently
within the 10% difference criteria as recorded.
Self-Monitoring Program:Monthly monitoring is conducted by the Facility as per the permit requirements with data submitted via NetDMR as appropriate. The Facility routinely meets holding
time requirements with the appropriate number of samples collected and reported as required in their UPDES permit. Information provided via NetDMR is consistent with the data reported
on the monthly operating reports and the laboratory bench sheets. Both composite and grab samples are conducted by the Facility as required in their UPDES Permit. Composite samplers
(Hach-Sigma) are located at both the influent and effluent monitoring stations and were observed to be functioning properly at the time of the inspection. Biochemical oxygen demand
(BOD), total suspended solids (TSS), and pH are required to be monitored monthly from both the influent and effluent. E-coli and Total Inorganic Nitrogen are required to be monitored
monthly from the effluent only. Oil & Grease and the following metals are to be monitored quarterly from both the influent and effluent; arsenic, cadmium, chromium, copper, cyanide,
lead, mercury, molybdenum, nickel, selenium, silver and zinc. The Facility also analyzes the influent and effluent on an annual basis for the total toxic organics found in 40 CFR 122,
Appendix D Table II as appropriate. Effluent flow to the land application site is monitored continuously (see below). Whole effluent toxicity (WET) biomonitoring testing is not required
at the Facility because there is no discharge to any surface waters of the State. The Facility utilizes Chemtech Ford Labs in Salt Lake County for metals, organics and Oil & Grease
analyses. All other required monitoring and analyses are conducted by the onsite NELAC certified lab.
Facility Site Walk & Tour:A full Facility walk through was conducted starting with the influent at the headworks building and following the treatment process to the effluent monitoring
station and land application site. All treatment units were in operation at the time of the inspection, including the new and third final clarifier that was installed in 2022. The
Facility was observed to be properly operated and with adequate safety features throughout the facility at the time of the inspection. Photos were collected and are included herein for
reference. Overall the entire Facility was observed to be very clean, organized, and well maintained.
DISCHARGE INFORMATION
At the time of the inspection, the final effluent discharge from the chlorine contact basins was observed to be flowing clear and steady with no odors, discoloration, excessive foaming,
or any other issues noted. The adjacent land application site was also observed with no deficiencies noted. Facility photosare included below.
DEFICIENCIESNone observed.
RECOMMENDATIONS

Continue keeping DWQ informed of any future changes regarding site conditions and operations with respect to the UPDES Permit and requirements therein.
PHOTO LOG
Photo No. 1
Date: 2-21-2025
Description: Onsite NELAC certified lab within administration building.
Photo No. 2
Date: 2-21-2025
Description: Influent structure outside of headworks building.
Photo No. 3
Date: 2-21-2025
Description: Influent autosampler inside headworks building.
Photo No. 4
Date: 2-21-2025
Description:Influent flow meter inside headworks building.
Photo No. 5
Date: 2-21-2025
Description:Weekly inflow measurements comparison log inside headworks building.
Photo No. 6
Date: 2-21-2025
Description:Mechanical fine screens inside headworks building.
Photo No. 7
Date: 2-21-2025
Description:Aerated grit chambers, post-headworks building.
Photo No. 8
Date: 2-21-2025
Description:Primary clarifiers with Administration building in background.
Photo No. 9
Date: 2-21-2025
Description:Oxidation ditches looking east.
Photo No. 10
Date: 2-21-2025
Description:View of digesters from oxidation ditches facing west.
Photo No. 11
Date: 2-21-2025
Description:Final clarifiers.
Photo No. 12
Date: 2-21-2025
Description:Chlorine contact basins. Note construction for new reuse building in background.
Photo No. 13
Date: 2-21-2025
Description:Rectangular weirs, flow monitoring and final effluent discharge from chlorine basins.
Photo No. 14
Date: 2-21-2025
Description:Effluent flow meter for north weir.
Photo No. 15
Date: 2-21-2025
Description:Effluent flow meter for south weir.
Photo No. 16
Date: 2-21-2025
Description:Continuous effluent Nitrogen monitoring for both weirs.
Photo No. 17
Date: 2-21-2025
Description:Effluent autosampler post-chlorine basins.
Photo No. 18
Date: 2-21-2025
Description:New chlorine injection controls inside chlorine building.
Photo No. 19
Date: 2-21-2025
Description: Final effluent pipe from chlorine basins to land application site exposed for new reuse bldg.
Photo No. 20

Date: 2-21-2025
Description:Facing east towards the adjacent fenced land application site.