Attchmt 8 DEQ Plan.pdf

Department of Environmental Quality

Western Region Salem Office

4026 Fairview Industrial Dr SE

Kate Brown, Governor Salem, OR 97302

(503) 378-8240

FAX (503) 373-7944

TTY 711

July 17, 2020

Quin Clements

Davido Consulting Group, Inc.

PO Box 1132

Freeland, WA 98249

CERTIFIED MAIL# 7019 0700 0000 8348 4506

Re: Facility: Lewis and Clark National Historical Park

File No.: 111613

WQ – Clatsop County

Project Title: New Onsite Wastewater Treatment System

Dear Mr. Clements:

DEQ received your application and construction plans on 3/11/2020 to modify the permit for the facility located at 92343 Fort Clatsop Road in Astoria. A Land Use Compatibility Statement accompanied the submittal. DEQ has completed its review of your proposed project as required by Oregon Administrative Rule 340-071-0130(18) and 340-052.

This is not your permit. Do not begin construction of the project until the permit has been issued.

The following is a brief description of your project:

The system is a Recirculating Textile Filter system designed for a maximum peak daily flow of 5,000 gallons per day.

The proposal is to install a 15,000-gallon septic/dosing tank, a 500-gallon dosing tank, a

5,000-gallon per day Orenco AX-Max treatment unit and 1,667 linear feet of pressurized distribution drainfield.

The plans are approved provided the following conditions are met:

1. The construction of the system must follow the approved plan dated July 17, 2020 including any DEQ corrections and notations on them. DEQ must approve any additional substantial changes.

2. A DEQ licensed installer as per OAR 340-071-0162(10) must perform all system construction.

Lewis and Clark National Historical Park

July 14, 2020

3. The wastewater treatment and dispersal system must be maintained by a maintenance provider certified as defined in OAR 340-071-0100.

4. The drainfield must only be installed when the soils are not saturated or at a moisture content which may cause loss of soil structure and porosity when worked.

5. All septic, dosing, and recirculation tanks must be tested for water tightness in accordance with OAR 340-073-025(3) and found to be watertight before using.

6. All material and equipment including, but not limited to, tanks, pipe, fittings, solvents, pumps, controls, valves, etc., must be installed, and constructed in accordance with manufacturer’s minimum specifications.

7. Effluent lift pump installations must include anti-siphon devices or check valves as appropriate. All pump installations must include a non-corrosive lifting device that will allow easy removal for inspection and maintenance. No flexible hose may be used outside of the tank risers on pump discharge assemblies.

8. The system designer must inspect all phases of the construction of the system and provide documentation indicating the results of the inspection. The inspection documentation must include any construction deficiencies noted and what was required to bring construction into compliance with DEQ-approved plans. Subsequent inspection documentation must verify that the corrections have been completed. Prior to placing the system into operation, the permittee must provide to DEQ written certification from the system designer, that the system has been constructed and tested in accordance with DEQ-approved plans. The attached form, “Inspection and Certification of Proper Construction”, must be used.

9. Prior to commencing operation and/or backfilling of the system, the permittee must notify

DEQ or Agent, in writing, that construction of the system has been completed, so that DEQ or Agent may conduct a final inspection.

10. Prior to placing the system into operation, the permittee must have a DEQ-approved O&M manual. The attached DEQ guidelines, will be used as the basis for review.

11. By no later than one month after commencing operation of the system, the permittee must provide affirmation from the designer that the facility is mechanically operating as intended based upon actual field inspection at the end of construction and start of operations to DEQ.

Any negative findings must be reported in writing to DEQ, and any necessary corrections proposed by the permittee.

12. The final project as constructed must comply with all applicable building, electrical, fire mechanical, plumbing, and safety codes.

13. This plan approval is valid for one year. Technologies, materials, and standards change so it is important to keep construction approvals up to date. If construction has not commenced within one year, plans must be resubmitted along with the appropriate fee for approval unless

Lewis and Clark National Historical Park

July 14, 2020 waived by DEQ. A valid Land Use Compatibility Statement from the local land use agency as well as a valid building permit from the local Building Codes jurisdiction will also be required.

Approval of plans means that DEQ has reviewed favorable the estimates, assumptions and the design presented in the specific project plans for reasonableness and practicality consistent with process technology and for the likelihood that the project may, if operated and maintained as proposed, achieve or maintain the desired result. Plan approval by DEQ does not warrant that the facility will meet expectations. Should the completed work fail to achieve design effluent parameters, the permittee may be required to provide additional facilities or processes.

The permittee is responsible for ensuring that the conditions of approval are met. Submittals should be directed to the DEQ office as listed on the face page of your permit. Failure to comply with the conditions in this letter may be cause for DEQ to initiate enforcement action that could result in civil penalties.

Please notify us of the preconstruction meeting between the contractor and designer so that we may attend. It is likely that DEQ staff will visit the construction site during and after construction. If you have any questions regarding this letter of final approval feel free to contact me by email at joye.jessica@deq.state.or.us or by phone at (503)378-5033.

Sincerely, Jessica Joye, REHS

Natural Resource Specialist

Enclosures: 1) Inspection and Certification of Proper Construction

2) Guidelines for Writing Large Onsite System Operation & Maintenance

Manuals for WPCF permitted facilities

Cc: File

Colby Mackley, NPS mailto:joye.jessica@deq.state.or.us