MPCA Design Guidance for Large Subsurface Wastewater ...

o
If the permit is subject to biosolids regulation, the attachment for Biosolids Information
Sheet found at www.pca.state.mn.us/publications/forms/wq-wwprm7-16.doc.
• This LSTS Guidance Document, including attachments (completed as appropriate)
• Ground-Water Mounding Calculations
• Hydrogeologic report (if applicable)
• Engineering report (complete system design including design of the septic tanks, pretreatment
unit, if applicable, and the sewer system)
• Plans & Specifications
• A draft Operation & Maintenance Manual, including a Nitrate Mitigation Plan
• Additional information as appropriate
Send completed permit application forms, attachments and fee to:
Minnesota Pollution Control Agency
Attn: Beckie Olson, Permit Document Coordinator
520 Lafayette Road N.
Saint Paul, MN 55155-4194
15. Permit requirements / construction requirements
After receiving a permit from the MPCA there are many requirements that need to be followed. These
requirements are found in the permit and in the plans and specification approval letter. Be sure to read
both documents to ensure compliance. Remember no construction can begin until the permit is issued
and plans and specifications are approved.
The following submittals are required:
• notice to proceed with construction 14 days after its execution
• change orders as described in the plan and specification approval letter
• for systems using synthetic liners
1) The Permittee must notify the MPCA in writing at least 14 days before the scheduled
placement of the liner. Sub-grade soils tests and compaction test results will be needed for
this pre-liner inspection.
2) The Permittee must notify the MPCA in writing at least 14 days before the scheduled prefill
of the lined treatment unit. The MPCA may then complete a pre-fill inspection. "Prefill"
means that the Permittee has accepted the work necessary to begin the water balance
test in accordance with MPCA Pre-fill and Water Balance Criteria.
Included with the above letter, if not previously submitted to the MPCA, must be the
following:
a. The contractor and liner manufacturer’s certifications that the liner was installed per
the plans and specifications.
b. The contractor and liner manufacturer’s certifications that the cover material was
placed per the plans and specifications.
c. The liner manufacturer’s certification that the installation was in conformance with
all warranty provisions and that no provisions of the warranty have been voided.
d. A copy of all liner test results on seam strength, strength of liner material, mil
thickness, etc.
e. A copy of the liner warranty.
Design Guidance for Large Subsurface
Minnesota Pollution Control Agency
Wastewater Treatment Systems April 2010
29