HomeMy WebLinkAboutExhibit 20_2025-05-27 Proceed to Engineering
STATE OF WASHINGTON
DEPARTMENT OF HEALTH
OFFICE of ENVIRONMENTAL HEALTH and SAFETY
wastewatermgmt@doh.wa.gov
PO Box 47824, Olympia, WA 98504
(360) 236-3330 711 Washington Relay Service
May 27, 2025
Dave Nakagawara
105 Hudson Street PO Box 1180
Port Townsend, WA 98368
Re: Proceed to Engineering for New LOSS; Project 2024-031; Port of Port Townsend
Industrial Park Large On-Site Sewage System (LOSS); System ID JEF042,
Jefferson County
Dear Dave Nakagawara:
The Washington State Department of Health (DOH) completed a site visit on May 6, 2025, to
verify the soil in the proposed drainfield for the Port of Port Townsend Industrial Park Large On-
site Sewage System (LOSS). The soil in the proposed drainfield was verified to be Type 6 soil
overlying Type 1 soil. Sand is proposed to bridge through the Type 6 soil and into the Type 1
soil.
A Site Risk Survey (SRS) was received from ADC Wastewater Engineering on May 15, 2025.
Information provided in the SRS may identify potential health and environmental impacts
resulting from the LOSS. The SRS indicated the proposed project site required a Level 1 Nitrate
Balance. DOH uses the Level 1 Nitrate Balance as a screening tool to identify LOSS which may
have potential impacts on unconfined or semi-confined aquifers. Results of the nitrate balance
calculated a potential nitrogen level of 1.99 mg/l at the point of compliance based on a
preliminary effluent strength of 60 mg/l.
The soil verification and environmental review for this LOSS is complete and we have
determined the proposed project is feasible with an understanding of waste strength treatment
level B with no nutrient reduction requirement. Sand will be required to bridge into the Type 1
soil in accordance with WAC 246-272B-06700. This correspondence is your notification of
approval to proceed to engineering. If you would like to discuss this further, please contact me
at frank.baird@doh.wa.gov.
Dave Nakagawara
May 27, 2025
Page 2
Sincerely,
Frank Baird
LOSS Program Hydrogeologist
cc: Magarita Fox, E.I.T., LOSS Program Engineer, DOH
Andrew Jones, P.E., LOSS & Reclaimed Water Program Supervisor, DOH
Jason Jacobson, P.E., ADC Engineering
Rocky Anderson, ADC Engineering
Jefferson County Public Health