DWQ-2025-004304

INSPECTION SUMMARY and FINDINGS
Company Name/ Permittee:Brigham City
Facility:Brigham City Wastewater Treatment Plant (BCWTP
Inspection Type:Biosolids Inspection
Permit Number: UTL022365
Start Date and Time: 09:00 18 March 2025
End Date and Time: 11:00 18 March 2025
Location: 600 North 1200 West
Brigham City, Utah 84302
OVERVIEW
Daniel Griffin of the Division of Water Quality (DWQ) met with Bryce Lofthouse, Plant Superintendent to conduct a Biosolids Inspection at the UPDES facility referenced above. The purpose
and scope of the inspection were 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.
PERMIT INFORMATION
Discharge
DWQ has issued an UPDES Permit to BCWTP; the permit number is UT0022365. The effective date of the UPDES Permit is January 3rd, 2020; the expiration date is December 31st, 2024 and is
in the process of being renewed. The Discharge Provisions are included in /Part I of the UPDES Permit. The effluent discharges to Box Elder Creek. This was not discussed as part of the
inspection.
Biosolids
The permit includes provisions for biosolids in Part III. The BCWTP has a Biosolids Program, the permit number is UTL022365. 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 BCWTP 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.
Wastewater Collection System
The BCWTP owns, maintains and operates a collection system. 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
The effective date of the Permit is 1 April 2023; the expiration date is 31 March 2028. The permit requires BCWTP to reapply 30 days before the permit expires.This was not discussed
as part of the inspection.
INSPECTION
BCWRP uses an activated sludge treatment process with ultraviolet (UV) disinfection. The Facility consists of 2 aerated grit chambers, 2 carousel oxidation ditches, 3 final clarifiers
operated in parallel, a DAF, 2 aerobic digesters, two incline dewatering presses, 4 UV disinfection units in series, a post-aeration chamber, and 18 sludge drying beds. The sludge generated
from the ditches is dried and composted onsite, then utilized for landscape and gardening purposes.
Solids from the clarifiers is pumped to the DAF where it is thickened then sent to the aerobic digesters. From here it is dewatered in the screw presses and moved to one of the drying
beds where it will accumulate and be mixed with green waste. When they have accumulated enough for a full row it will be moved to the composting area and they will start the composting
process.
Once composting has completed it will be sampled and moved to the distribution and storage area where it will be screened and staged for different uses. The distribution is done from
a property next to the BCWTP where the City also distributes other compost and products to the public. This includes composted green waste, sand, gravel, rocks, woods chips and finished
Class A Biosolids Compost. The area also has space to receive green waste from the area for processing.
The composting and distribution areas are asphalted and separated by a fence. The runoff from the areas is kept separate by sloping the areas down and away from the fence. All runoff
from the composting area is collected in the plant storm drains and directed back to the head works.
Brigham City uses an activated sludge treatment process with ultra violet (UV) disinfection. The physical plant consists of; 2 aerated grit chambers; 2 carousel oxidation ditches; 2
final clarifiers operated in parallel; 2 aerobic digesters; 2 UV disinfection units in series; a post aeration chamber; and 18 sludge drying beds. The facility was placed in service
in 1987 replacing a 3.0 million gallons per day (MGD) trickling filter plant. The existing facility has a design capacity of 4.0 MGD. The facility is designed for a population equivalent
of 29,000 and influent organic loadings of 216 milligrams per liter (mg/1) biochemical oxygen demand (BODs) and 216 mg/1 total suspended solids (TSS). The area population serviced by
the plant is estimated at 17,665 including the town of Brigham City (17,000) and Mantua (665). The facility is located at 600 North 1200 West, Brigham City, Box Elder County. The sludge
generated from the ditches is dried and composted onsite, then utilized for landscape and gardening purposes.
BCWRP submits and annual report for their biosolids program. A review of submitted reports shows they average just under 400 dry metric tons (DMT) of biosolids a year, and the metals
monitoring indicates they levels have always been below table 3 limit, and therefore the biosolids that are distributed to the public have been considered Exceptional Quality (EQ) Class
A Biosolids.
During the site tour the digestors, screw presses, drying beds, compost pad, and distribution area were all visited.
DEFICIENCIES
There were no deficiencies identified during the inspection.
RECOMMENDATIONS
There are no recommendations identified during the inspection.
DWQ-DWQ-2025-004
Letter DWQ-2025-004
Checklist DWQ-2025-004