DWQ-2025-003319

UPDES INSPECTION SUMMARY and FINDINGS
Permittee Name:Grantsville City Corporation
Facility Name:Grantsville City Water Reclamation Facility
Inspection Type:Compliance Evaluation Inspection
Permit Number: UT0021130
Start Date and Time: 09 April 2025, 10:00 AM
End Date and Time: 09 April 2025, 11:20 AM
Facility Location: 630 North Race RoadGrantsville, Utah
OVERVIEW
Jeff Studenka, Dan Griffin and George Meados of the Division of Water Quality (DWQ) met with Markus Seat, Operator and Deputy Public Works Director,Christy Mortierth, Public Works Director
and other staff representing the Grantsville City Water Reclamation Facility (Facility) to perform a 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 conducted on August 21, 2018 that required follow-up at this time.
PERMIT INFORMATION
Discharge
Receiving Waters:Irrigation Ditch to Blue Lakes
Permitted Outfalls:001
Permit Issuance Date:07/01/2024
Permit Expiration Date:03/31/2029
Treatment Design Flow:1.9 MGD (currently as permitted)
Outfall Coordinates: latitude 40°37'15" and longitude 112°26'50"
Biosolids
The State of Utah has adopted the 40 CFR Part 503 federal regulations for the disposal of sewage sludge (biosolids) by reference. However, since this Facility is a lagoon-type facility,
there is not any regular sludge production. Therefore 40 CFR Part 503 does not apply at this time. In the future, if the sludge needs to be removed from the lagoons and is disposed
in some way, DWQ must be contacted prior to the removal of the sludge to ensure that all applicable state and federal regulations are met.
Pretreatment
The Permit includes provisions for Pretreatment requirements in Part II. The Facilitydoes not currently have 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 this CEI.
Wastewater Collection System
TheFacility operatesand maintains the collection system. 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 the following
website:
https://deq.utah.gov/water-quality/utah-sewer-management-program-usmp
BACKGROUND/PROCESS INFORAMTION
Wastewater Lagoons Facility:The Grantsville wastewater lagoons and Facility was initially constructed in 1972 to service Grantsville City,which has a current population of approximately
12,000residents and a currentFacility peak design flow of 1.9 MGD. The Facility consists of a headworks building containing a step screen and disposal setup along with the influent
autosampler. The Facility is equipped with a diesel-powered generator as a backup power source for the headworks building. Following the headworks, the Facility consists of 4 lagoon
cells; 1 primary, 1 secondary, 2 tertiary, and then 4additional holding cells that can receive effluent during times when discharging is not the preferred option, or if any permit limits
might be exceeded. The holding cells operate as infiltration basins and evaporation ponds when needed. The primary lagoon has an ATLAS aeration system which has improved the process
and water quality for the facility over time. The secondary lagoon has 5 aerators and the first tertiary cell has 3 aerators when needed. The lagoon cells are contained on 102.2 acres
in total. The following is a summary of each of the lagoon cells:
Lagoon Cell #
Type/Function
Surface Area, acres
Depth, ft
1
Aerated/Primary
2.69
10
2
Aerated/Secondary
2.66
10
3
Aerated/Tertiary
3.64
10
4
Facultative/Tertiary

3.26
7
5
Holding/Evaporation/Infiltration
7.0
7
6
Holding/Evaporation/Infiltration
6.1
3
7
Holding/Evaporation/Infiltration
6.1
3
8
Holding/Evaporation/Infiltration
7.9
3
Following the lagoon cells is the disinfection building. The disinfection building contains the effluent flow meter and the ultraviolet (UV) light channel for disinfection. The UV
channel is 21 feet long, 20 inches wide and contains two banks of UV lights in series, with 40 lights per bank. The building also houses the onsite laboratory and Operator’s office.
Following the UV disinfection is the final effluent flow measurement flume and discharge (Outfall 001).
INSPECTION ACTIVITIES
Flow Measurements:Flow is continuously measured for both the influent and the effluent using 15-inch Palmer-Bowlus flumes with correspondingultrasonic flow meters. Both flow measurements
are recordedin the effluent building near the lab. This is the primary method of measuring flows for UPDES reporting purposes. The flows can also be measured with a staff gauge or
measuring tape at each flume if necessary as a backup option. Annualflow meter servicing and comparisons are conducted by an outside vendor as recorded (See photos).
Self-Monitoring Program:Discharge Monitoring Report (DMR) data for several months of 2024-25 were reviewed and compared to the monthly operation summary report, as well as the laboratory
reports for all UPDES permit compliance monitoring. DMRs are submitted monthly via NetDMR as required.Both composite and grab samples are conducted as required in the UPDES Permit.Hach
auto-samplers are utilized for composite samples for both the influent and effluent monitoring as required as were observed to be functioning properly at the time of the inspection.
Samples for pH and DO permit compliance are instantaneously analyzed at the on-site laboratory. When a pH sample is taken as required by the permit, it is immediately analyzed onsite
within the 15-minute holding time requirement, however the sample times and analyses times for both pH and DO were not being recorded. DWQ recommended that the Facility also record sample
times and analyses times for pH and DO as is done with the other permit sampling requirements (See Recommendations below).All other permit compliance samples, including BOD, TSS, TDS,
ammonia, TP & other nutrient parameters, along with metals and toxic organics, are hand delivered on ice same day to Chemtech Ford in Sandy, Utah for analyses. Information provided
in NetDMR was consistent with the data reported on the laboratory reports and monthly summary sheets for the months reviewed in 2024-25. Holding times were consistently met, and the
appropriate numbers of samples were collected as specified in the permit.
Facility Site Walk & Tour: A full Facility tour was conducted following the treatment process from influent to effluent. Safety features and good housekeeping practices were observed
throughout the plant as appropriate. At the time of the inspection, the Facility appeared to be well-maintained and operated, with no deficiencies observed and no concerns noted. Photos
from the Facility walk-through are included below.
DISCHARGE INFORMATION
At the time of the inspection, the final effluent discharge was observed to be clear and steady at the Outfall 001 location. There was no odor, discoloration, foaming, or other issues
noted at the time of the inspection. The receiving water of the irrigation ditch to Blue Lakes was also observed with no issues identified. Photos of the effluent discharge are included
below.
DEFICIENCIESNone observed.
RECOMMENDATIONS
Ensure that sample times and analyses times are also recorded for instantaneous monitoring of pH and dissolved oxygen as we discussed onsite. This will better document that the instantaneous
monitoring as required in the UPDES Permit is conducted within the 15-minute holding times as appropriate.
Continue keeping DWQ informed of any changes to site conditions and operations in regards to future Facility expansion and UPDES Permit requirements.
PHOTO LOG
Photo No. 1
Date:4-9-2025
Description:Step screen inside headworks building.
Photo No. 2
Date:4-9-2025
Description:Influent autosampler inside headworks building.
Photo No. 3
Date:4-9-2025
Description: Influent flow meter (note calibration service info).
Photo No. 4
Date:4-9-2025
Description:Influent flume just outside headworks building.
Photo No. 5

Date:4-9-2025
Description:First lagoon cell with ATLAS aeration system.
Photo No. 6
Date:4-9-2025
Description:Second lagoon cell.
Photo No. 7
Date:4-9-2025
Description:Third lagoon cell.
Photo No. 8
Date:4-9-2025
Description:Fourth lagoon cell with effluent building in background.
Photo No. 9
Date:4-9-2025
Description:One of four holding pond cells (note headworks building in far background).
Photo No. 10
Date:4-9-2025
Description: Another holding pond cell near the effluent building.
Photo No. 11
Date:4-9-2025
Description:Effluent autosampler near UV system in side effluent building.
Photo No. 12
Date:4-9-2025
Description:UV disinfection channel inside effluent building.
Photo No. 13
Date:4-9-2025
Description: Effluent flume just after UV disinfection and right before Outfall 001.
Photo No. 14
Date:4-9-2025
Description:Outfall 001 discharging to the irrigation ditch.
Photo No. 15
Date: 4-9-2025
Description:Looking downstream from Outfall 001.
Photo No. 16
Date: 4-9-2025
Description:Effluent flow meter inside effluent building (note calibration service info).
Photo No. 17
Date: 4-9-2025
Description:Lab area inside effluent building (note pH and DO meters).
Photo No. 18
Date: 4-9-2025
Description:Area adjacent to the headworks building where the new mechanical plant will be built.
DWQ-2025-00