HomeMy WebLinkAboutDWQ-2025-003202
INSPECTION SUMMARY and FINDINGS
Permittee Name: Timpanogos Special Service District (TSSD)
Facility: Timpanogos Wastewater Treatment Facility
Inspection Type: Biosolids Inspection
Permit Number: UTL023639
Start Date and Time: 17 March 2025, 1:00PM
End Date and Time: 17 March 2025, 3:00 PM
Facility Location: 6400 N 5050 W, American Fork, UT 84003
OVERVIEW
Daniel Griffin of the Division of Water Quality (DWQ) met with Rich Mickelsen, District Manager, Sam Grimes, and Meghan Pope representing TSSD to conduct a Biosolids Inspection at the
UPDES facility referenced above. The purpose and scope of the inspection was discussed with credentials presented, the DWQ UPDES Inspection Checklist was completed, and a facility tour
was conducted. There were no deficiencies noted for follow up from the previous Inspection conducted in September 2019.
PERMIT INFORMATION
Discharge
DWQ has issued an UPDES Permit to TSSD; the permit number is UT0023639. The effective date of the UPDES Permit is July 8th, 2020; the expiration date is July 7th, 2025. The Discharge
Provisions are included in Part I of the UPDES Permit. The effluent discharges to Utah Lake. This was not discussed as part of the inspection.
Biosolids
The permit includes provisions for biosolids in Part III. The TSSD has a Biosolids Program, the permit number is UTL023639. This was discussed as part of the inspection. Information
regarding the discussion can be found in the Biosolids Section of this report.
Pretreatment
The permit includes provisions for pretreatment requirements. The TSSD has been approved by DWQ to implement an Approved Pretreatment Publicly Owned Treatment Works Program. This is
inspected more thoroughly during pretreatment inspections by DWQ. This was not discussed as part of the inspection.
INSPECTION
Influent flows are treated in aerated bioreactors, then through 9 clarifiers for settling. The treated wastewater then passes through an ultraviolet (UV) disinfection unit and is then
discharged. Outfall 001 is located at a latitude of 40º 20' 26" and a longitude of 111º 46' 35" discharging to Utah Lake.
The solids from the clarifiers are sent to aerated holding basins and periodically dewatered by belt press and loaded into trucks and transferred to holding pads to wait for to be loaded
into truck for hauling to a landfill, or they are directly loaded into truck for hauling to a landfill. hauling to a landfill. Biosolids are hauled by a contractor to one of three landfills
(i.e., Bay View, Intermountain Regional Landfill or Wasatch Regional Landfill), and only on weekdays.
The day of the inspection, TSSD had taken possession of two new trailers for hauling biosolids that will help them reduce the number of times they handle biosolids onsite. Typically,
they fill a dump truck from the overhead hopper then deposit it in a drying bed. The contract haulers trailers are loaded from the drying bed. Sometimes this is done while the drivers
are waiting, reducing the time the drivers have to deliver the loads.
The new trailers will allow them to fill delivery trailersfrom the overhead hopper directly over the weekend, or while others were being emptied at a landfill, and have them ready to
be hauled to a landfill when the drivers get back. Increasing the number of loads going to the landfill, and reduce wait times.
While explaining this, Rich Mickelson updated me on the planned upgrades to the biosolids processing that are to be completed by 2029. These biosolids processing changes are being added
to support the plant wastewater treatment upgrades that are being underway at TSSD.
First, they plan to bring another aerated biosolids holding basin online.
Second, they plan to add an Anerobic Digester to reduce the final volume of biosolids produced rate.
Third they will add a biosolids thermal dryer after the belt presses.
The dryer along with the digestors will enable TSSD to produce a Class B biosolids product that is easily used for land application. They also, may be able to generate a Class A biosolids
product for unrestricted land applicationwith the improvements.
DEFICIENCIES
No deficiencies were identified during the inspection.
RECOMMENDATIONS
No deficiencies were identified during the inspection.