DWQ-2024-007905

Official Draft Public Notice Version Month Day, year
The findings, determinations, and assertions contained in this document are not final and subject to change following the public comment period.
FACT SHEET AND STATEMENT OF BASIS
MIMBACH
RENEWAL PERMIT: BIOSOLIDS
UPDES BIOSOLIDS PERMIT NUMBER: UTL026344
INDUSTRIAL
FACILITY CONTACTSOperator Name:Mimbach Co, Inc.Contact:Kylee MimbachPosition: OwnerPhone Number:[phone] Permittee Name:Mimbach CoFacility Name:Mimbach CoMailing and Facility Address:PO
Box 634Oakley, Utah 84055Telephone:[phone]
Actual Address:7756 Lower Bowl RoadPeoa, Utah
DESCRIPTION OF FACILITY
Mimbach Co, Inc. operates a composting and soil preparations facility in Peoa Utah. The Facilityis identified as Mimbach Co. They receive and compost different materials from different
location and distribute the compost to the public. They are planning to receive unclassified biosolids from POTWs in Summit and Wasatch Counties and compost them. They are permitted
to compost food and other wastes that are regulated through the Utah Division of Waste Management and Radiation Control (DWMRC). This permit is to add coverage for the addition of biosolids
to the process.
One local POTW has indicated that they may send dewatered biosolids to Mimbach Co for further drying, then transfer it to a landfill for disposal. Since this activity will not involve
the further processing of the biosolids for beneficial use, it does not require inclusion in this permit. Those materials will only be included in any monitoring, processing and reporting
requirements if they are incorporated in the other biosolids operations.
They have also indicatedthat in the future they are interested in land application of biosolids on a tree farm and other property they own, as well as producing biochar. These can be
added to the coverage of this permit at a later date when they know that they are going to proceed with either or both of these activities. It will just require them to notify DWQ prior
to the start of these activities with plans of how they intend to proceed.
DISCHARGE
There is no discharge authorized under this permit.
BIOSOLIDS
For clarification purposes, sewage sludge is considered solids, until treatment or testing shows that the solids are safe, and meet beneficial use standards. After the solids are tested
or treated, the solids are then known as biosolids. Class A biosolids, may be used for high public contact sites, such as home lawns and gardens, parks, or playing fields, etc. Class
B biosolids may be used for low public contact sites, such as farms, rangeland, or reclamation sites, etc.
DESCRIPTION OF TREATMENT AND DISPOSAL
The Permittee is a new facility that will start composting biosolids on site.
The solids will be received a publicly owned treatment works (POTW) and composted onsite with other compostable materials. As a new Permittee, the facility has not yet processed biosolids.

They have also expressed interest in drying biosolids for some POTW’s in Summit County.
Biosolids were hauled to the Wasatch Regional Landfill, Inc. by District employees. No contract hauler(s) were used. Approximately 957 DMT were hauled off-site to the landfill for disposal.
See attached application and Letter of Authorization from Republic Services, operators of Wasatch Regional Landfill, Inc
SELF-MONITORING REQUIREMENTS
Under 40 CFR 503.16(a)(1), the self-monitoring requirements are based upon the amount of biosolids processed per year and shall be monitored according to the chart below.
Minimum Frequency of Monitoring (40 CFR Part 503.16, 503.26, and 503.46)
Amount of Biosolids Produced, Processed, or Disposed of Per Year
Monitoring Frequency
Dry US Tons
Dry Metric Tons
Per Year or Batch
> 0 to < 320
> 0 to < 290
Once Per Year or Batch
> 320 to < 1650
> 290 to < 1,500
Once a Quarter or Four Times
> 1,650 to < 16,500
> 1,500 to < 15,000
Bi-Monthly or Six Times
> 16,500
> 15,000
Monthly or Twelve Times
The Permittee has yet to processes any biosolids. When they start composting, they will have to monitor according to the mass they receive. It is estimated that they will receive approximately
100 DMT or less of biosolids for composting to begin with.
Landfill MonitoringUnder 40 CFR 258, the landfill monitoring requirements include a paint filter test. If the biosolids do not pass a paint filter test, the biosolids cannot be disposed
in the sanitary landfill (40 CFR 258.28(c)(1).
BIOSOLIDS LIMITATIONS
Heavy MetalsThe intent of the heavy metals regulations of Tables 1, 2 and 3, of 40 CFR 503.13 is to ensure that heavy metals do not build up in the soil at home lawn, gardens, farms,

forest land, and land reclamation sites to the point where the heavy metals become phytotoxic to plants. The permittee will be required to produce an information sheet (see Part III.
C. of the permit) to be handed out to all people who are receiving and land applying the biosolids, if biosolids are only applied to land owned by the permittee, the information sheet
requirements are waived. If the biosolids are land applied according to the regulations of 40 CFR 503.13, to any reasonable degree, the biosolids will be able to be land applied year
after year, to the same farms, ranches, and land reclamation sites without any deleterious effects to the environment. Class A Requirements With Regards to Heavy Metals If the biosolids
are to be applied to a lawn or home garden, the biosolids shall not exceed the maximum heavy metals in Table 3 below. If the biosolids do not meet these requirements, the biosolids cannot
be sold or given away for applications to home lawns and gardens.Class B Requirements With Regards to Heavy Metals
If the biosolids are to be land applied to agricultural land, forest land, a public contact site or a reclamation site it must meet at all times:
The maximum heavy metals concentration limits listed in 40 CFR Part 503.13(b) Table 1 and the heavy metals loading rates in40 CFR Part 503.13(b) Table 2; or
The maximum heavy metals in 40 CFR Part 503.13(b) Table 1 and the monthly heavy metals concentration limits in 40 CFR Part 503.13(b) Table 3.
Tables 1, 2, and 3 of Heavy Metal Limitations
Pollutant Limits, (40 CFR Part 503.13(b)) Dry Mass Basis
Heavy Metals
Table 1
Table 2
Table 3
Table 4

Ceiling Conc. Limits 1, (mg/kg)
CPLR 2, (kg/ha)
Pollutant Conc. Limits 3 (mg/kg)
APLR 4, (kg/ha-yr)
Total Arsenic
75
41
41
2.0
Total Cadmium
85
39
39
1.9
Total Copper
4300
1500
1500
75
Total Lead
840
300
300
15
Total Mercury
57
17
17
0.85
Total Molybdenum
75
N/A
N/A
N/A
Total Nickel
420
420
420
21
Total Selenium
100
100
100

5.0
Total Zinc
7500
2800
2800
140
1, If the concentration of any 1 (one) of these parameters exceeds the Table 1 limit, the biosolids cannot be land applied or beneficially reused in any way.
2, CPLR - Cumulative Pollutant Loading Rate - The maximum loading for any 1 (one) of the parameters listed that may be applied to land when biosolids are land applied or beneficially
used on agricultural, forestry, or a reclamation site.
3, If the concentration of any 1 (one) of these parameters exceeds the Table 3 limit, the biosolids cannot be land applied or beneficially used in on a lawn, home garden, or other high
potential public contact site(40 CFR Part 503.31(d)). If any 1 (one) of these parameters exceeds the Table 3 limit, the biosolids may be land applied or beneficially reused on an agricultural,
forestry, reclamation site, or other high potential public contact site, as long as it meets the requirements of Table 1, Table 2, and Table 4.
4, APLR - Annual Pollutant Loading Rate - The maximum annual loading for any 1 (one) of the parameters listed that may be applied to land when biosolids are land applied or beneficially
reused on agricultural, forestry, or a reclamation site, when they do not meet Table 3, but do meet Table 1.Any violation of these limitations shall be reported in accordance with the
requirements of Part III.F.1. of the permit.If the biosolids do not meet these requirements they cannot be land applied.
PathogensThe table below presents Pathogen Control Class limitations that must be met.
Pathogen Control Class
503.32 (a)(1) - (5), (7), (8), Class A
503.32 (b)(1) - (5), Class B
B Salmonella species –less than three (3) MPN1per four (4) grams total solids (DWB)2 or Fecal Coliforms – less than 1,000 MPN per gram total solids (DWB).
Fecal Coliforms – less than 2,000,000 MPN or CFU3 per gram total solids (DWB).
503.32 (a)(6) Class A—Alternative 4
B Salmonella species –less than three (3) MPN per four (4) grams total solids (DWB) or less than 1,000 MPN Fecal Coliforms per gram total solids (DWB),
And - Enteric viruses –less than one (1) plaque forming unit per four (4) grams total solids(DWB)
And - Viable helminth ova –less than one (1) per four (4) grams total solids (DWB)
1 - MPN – Most Probable Number
2 - DWB – Dry Weight Basis
3 - CFU – Colony Forming Units
Class A Requirements for Home Lawn and Garden Use
If biosolids are land applied to home lawns and gardens, the biosolids need to be treated by a specific process to further reduce pathogens (PFRP), and meet a microbiological limit of
less than less than 3 most probable number (MPN) of Salmonella per 4 grams of total solids (or less than 1,000 most probable number (MPN/g) of fecal coliform per gram of total solids)
to be considered Class A biosolids (40 CFR 503.32(a)(7)(i)). The Permittee has chosen to achieve PFRP through a method of composting.1. Windrow Method-Using the windrow method of composting,
the temperature needs to be maintained at 55oC (131oF) or higher for fifteen days, with a minimum of five turnings during those fifteen days.
This composting method is found under (40 CFR 503.32(a)(8)(ii)).
The practice of sale or giveaway to the public is an acceptable use of biosolids of this quality as long as the biosolids continue to meet Class A standards with respect to pathogens.
If the biosolids do not meet Class A pathogen standards the biosolids cannot be sold or given away to the public, and the permittee will need find another method of beneficial use or
disposal.
Pathogens Class B
If biosolids are to be land applied for agriculture or land reclamation the solids need to be treated by a specific process to significantly reduce pathogens (PSRP). At this time the
Permitteedoes not intend to distribute bulk biosolids for land application and thus is not required meet Class B Biosolids requirements currently.
Vector Attraction Reduction (VAR)
If the biosolids are land applied the Permitteewill be required to meet VAR through the use of a method of listed under 40 CFR 503.33. The Permitteeintends to meet the vector attraction
reduction requirements through the method listed below, but may choose to use another method listed in 40 CFR 503.33(b)(1) through 503.33(b)(11).Composting-Under 40 CFR 503.33(b)(5)
the solids need treated through composting with a temperature of 40° C (104° F) or higher for at least 14 days with an average temperature of over 45° C (113° F).
If the biosolids do not meet a method of VAR, the biosolids cannot be land applied.
If the permittee intends to use another one of the listed alternatives in 40 CFR 503.33, the Director and the EPA must be informed at least thirty (30) days prior to its use. This change
may be made without additional public notice
Landfill Monitoring Under 40 CFR 258, the landfill monitoring requirements include a paint filter test to determine if the biosolids exhibit free liquid. If the biosolids do not pass
a paint filter test, the biosolids cannot be disposed in the sanitary landfill (40 CFR 258.28(c)(1)).
Record Keeping
The record keeping requirements from 40 CFR 503.17 are included under Part III.G. of the permit. The amount of time the records must be maintained are dependent on the quality of the
biosolids in regards to the metals concentrations. If the biosolids continue to meet the metals limits of Table 3 of 40 CFR 503.13, and are sold or given away the records must be retained
for a minimum of five years. If the biosolids are disposed in a landfill the records must retained for a minimum of five years.
Reporting
For calendar years during which biosolids are produced and/or processed the Permitteemust report annually as required in 40 CFR 503.18. This report is to include the results of all
monitoring performed in accordance with Part III.B of the permit, information on management practices, biosolids treatment, and certifications. This report is due no later than February
19 of each year. Each report is for the previous calendar year.
MONITORING DATA
The Permittee will be receiving biosolids from POTWs for further processing and distribution. The permittee may either use the metals monitoring results provided by the biosolids producing
POTWs, or sample the biosolids transferred to them for metals, but they do not need to do both.

Pathogen monitoring is required after composting, prior to distribution of the processed biosolids to confirm the process has achieved reduction requirements.
STORM WATER
Separate storm water permits may be required based on the types of activities occurring on site.
Permit coverage under the Multi Sector General Permit (MSGP) for Storm Water Discharges from Industrial Activities may be required based on the Standard Industrial Classification (SIC)
code for the facility and the types of industrial activities occurring.
Information onstorm water permit requirements can be found at http://stormwater.utah.gov
PRETREATMENT REQUIREMENTS
Any process wastewater that the facility may discharge to the sanitary sewer, either as direct discharge or as a hauled waste, is subject to federal, state and local pretreatment regulations.
Pursuant to Section 307 of the Clean Water Act, the permittee shall comply with all applicable Federal General Pretreatment Regulations promulgated found in 40 CFR Part 403, the State
Pretreatment Requirements found in UAC R317-8-8, and any specific local discharge limitations developed by the Publicly Owned Treatment Works (POTW) accepting the waste.
In addition, in accordance with 40 CFR 403.12(p)(1), the permittee must notify the POTW, the EPA Regional Waste Management Director, and the State hazardous waste authorities, in writing,
if they discharge any substance into a POTW which if otherwise disposed of would be considered a hazardous waste under 40 CFR Part 261. This notification must include the name of the
hazardous waste, the EPA hazardous waste number, and the type of discharge (continuous or batch).
BIOMONITORING REQUIREMENTS
A nationwide effort to control toxic discharges where effluent toxicity is an existing or potential concern is regulated in accordance with the Utah Pollutant Discharge Elimination System
Permit and Enforcement Guidance Document for Whole Effluent Toxicity Control (biomonitoring), dated February 2018. Authority to require effluent biomonitoring is provided in Permit
Conditions, UAC R317-8-4.2, Permit Provisions, UAC R317-8-5.3 and Water Quality Standards, UAC R317-2-5 and R317 -2-7.2.
The Permittee is a minor non-discharging facility. As a result, biomonitoring of the effluent will not be required. However, the permit will contain a WET reopener provision.
PERMIT DURATIONIt is recommended that this permit be effective for a duration of five (5) years.Drafted and Reviewed byDaniel Griffin, BiosolidsPermit WriterUtah Division of Water Quality,
[phone]PUBLIC NOTICEBegan: Month Day, YearEnded: Month Day, YearComments will be received at: 195 North 1950 West PO Box 144870 Salt Lake City, UT 84114-4870The Public Noticed
of the draft permit was published on theDivision of Water Quality Public Notice Webpage.During the public comment period provided under R317-8-6.5, any interested person may submit written
comments on the draft permit and may request a public hearing, if no hearing has already been scheduled. A request for a public hearing shall be in writing and shall state the nature
of the issues proposed to be raised in the hearing. All comments will be considered in making the final decision and shall be answered as provided in R317-8-6.12.During finalization
of the Permit certain dates, spelling edits and minor language corrections may be completed. Due to the nature of these changes they may not considered Major and the permit may not require
another Public Noticeperiod.
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