DWQ-2024-006812

ATTN: CHARLES W. AKERLOW
Tooele Valley Public Infrastructure District
8371 South State Street, Suite 202
Sandy, Utah 84070
([e-mail])
Subject:Approval-in-Concept – Tooele Valley Business ParkLarge Underground Wastewater Disposal System (LUWDS) – located South of the Burmester Interchange on I-80 (Exit 88) in Tooele
County (Parcel ID Numbers 05-054-0-0040, 05-054-0-0041, 05-054-0-0042 and 05-054-0-0044)
Dear Mr. Akerlow:
The Utah Department of Environmental Quality, Division of Water Quality (Division) has reviewed the feasibility report (DWQ-2024-006811) submitted by Richard Jex, of Jex Environmental
Solutions,on September17, 2024 for a LUWDS to serve multiple commercial connections for the subject project. Proposed cumulative wastewater discharge flows from multiple properties for
this project place review and permitting authority under the Division of Water Quality. An Approval-in-Concept, as constituted by this letter, is issued subject to the following conditions:
This Concept-in-Approval is for a LUWDS with the following characteristics:
The LUWDS shall be managed under the sponsorship of the Tooele Valley Public Infrastructure District;
The LUWDS shall be designed to serve multiple commercial connectionsthat will include warehouses, cafeterias, offices, and possible light industrial units;
Designed wastewater flows of 35,000 gallons per day;
A minimum septic tank capacity of 52,500 gallons;
Orenco recirculating textile filter treatment system capable of treating a minimum of 35,000 gallons of wastewater per day. The septic tank effluent loading rate for treatment units
may not exceed 30 gallons per day per square foot of treatment media;
An Orenco moving bed bioreactor (MBBR) unit capable of treating 35,000 gpd;
A drain field including both the drain field and the replacement areas (two duplicate systems), in addition to a suitable reserve area shall be required as described in R317-5-3.12.
Any changes to the design criteria described above shall be approved in writing by the Division. Any future proposal for expansion of the project facilities or wastewater flows exceeding
35,000 gpd may require Division review for additional wastewater treatment facilities and wastewater discharge permitting.
Soil data gathered in 2024 is within the general area of the proposed system and may be used for drain field sizing and placement. Test pit locations are appropriate and are of sufficient
number for the initial and replacement drain field areas. Any relocation or changes to drain field areas may require additional soil testing if deemed necessary by the Director. The
maximum soil application rate of 0.8 gallons per day per square foot shall be used for drainfield system design. A 30% drainfield size reduction for use of a recirculating textile filter
may be applied, provided acceptable plans and details are provided
Sponsorship proposed constitutes a management district. The permittee, Tooele Valley Public Infrastructure District(TVPID), shall acknowledge in a written document its sponsorship and
ownership of the LUWDS and its responsibilities for operation, maintenance, repairs, inspections, reporting, and sampling, and record keeping as required in R317-5-9 and R317-5-10.
A plan of operation, as listed in R317-3-1.1.8, shall be required to be submitted to the Division as a condition of any construction permit.
The permittee shall submit a completed Utah Underground Injection Control (UIC) Inventory Information Form for UIC-Regulated Domestic Wastewater Disposal Systems as required in R317-7
as a condition of any LUWDS construction permit. This form is available online at: https://deq.utah.gov/legacy/programs/water-quality/utah-underground-injection-control/index.htm. Please
contact Porter Henze, of the Division, by telephone at [phone]or by email at [e-mail] more information.
The permittee shall obtain a construction permit before allowing any excavation, construction, or installation of equipment to begin. A construction permit application, consisting of
an engineering report and design calculations, engineering plans, and specifications, shall be submitted for Division review prior to the Division issuing a construction permit. The
following shall be incorporated in the construction permit application:
All plans and design reports shall meet the applicable requirements of R317-3 and R317-5 and shall be submitted by the managing political entity, the Tooele ValleyPublic Infrastructure
District (TVPID);
Detailed plans for the wastewater collection system and collection pipe network, in accordance with R317-3-2, shall be submitted. Hydraulic calculations for the collection system shall
be furnished with the plans submittal;
Detailed plans and design reports for an Orenco recirculating textile filter and MBBR treatment system capable of treating 35,000 gallons of wastewater per day shall be submitted and
approved by the Division prior to beginning any construction. The wastewater effluent loading rate to the treatment system may not exceed 30 gallons per day per square foot. Plans and
specifications for a flow meter that monitors and records daily wastewater flows to the treatment system shall be required. Such plans shall include appropriate hydraulic calculations
and design specifications;
Engineering plans and specifications for a pressurized drain field including both the drain field and the replacement area (two duplicate systems) shall be required. Include appropriate
hydraulic calculations with the engineering report;
Suitable land for a reserve area shall be designated and shown on system plans as required in R317-5-3.12.
A detailed operation and maintenance manual shall be required to provide detailed instructions and a schedule for Orenco recirculating textile filter and MBBR treatment system operation,
maintenance, and equipment inspection.
Once the LUWDS is installed, inspected, and an operating permit has been issued, the TVPID shall comply with ongoing operation and maintenance, inspection, sampling, and reporting requirements
listed in R317-5-9 and R317-5-10.
This Approval-in-Concept is not a construction permit or a permit to operate. No construction may begin until plans and design specifications are approved and a construction permit is
issued by the Division. The issuance of this Approval-in-Concept does not relieve the system owner or the owner’s agent, in any way, of any obligations to comply with all applicable
regulatory requirements, or obtaining applicable permits from other agencies. We recommend you contact Bryan Slade, Tooele County Health Department (435-277-2450), for compliance with
other local requirements.
This Concept-in-Approval shall expire one year after the issue date, unless plans and specifications for a construction permit have been submitted to the Division. The Director may require
additional information or that plans, design reports, and specifications be resubmitted if an approval-in-concept letter has expired or an applicant fails to make substantial progress
toward obtaining a construction permit.
Please submit design plans and specifications that incorporate the comments and any changes indicated above as referenced in R317-5-5. Two full sets of plans, specifications, calculations,
and engineering reports that are sealed, signed, and dated by a professional engineer and Level 3 certified onsite professional shall be submitted for review and issuance of a construction

permit.
Please call me at [phone] or email me at [e-mail] if you have any questions regarding this letter or need any additional information.
Sincerely,
Robert R. Beers, MBA, EHS
Engineering Section
cc: Bryan Slade, Tooele CountyHealth Department, [e-mail] Smock, Zenith Bolinder, [e-mail]
Richard Jex, Jex Environmental Solutions, LLC, [e-mail] Hoffman. DWQ Engineering Section Manager, [e-mail]
File: P:\WQ\DWQDatabases\LargeUndergroundSystemDatabase\Project Documents\Tooele Valley Business Park
DWQ-2024-00