Public notification: Routine water study to support Project Macoma on July 2

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In keeping with our commitment to transparency and open communication with the Port Angeles community, we are providing information about an upcoming water mixing study we'll be conducting in Port Angeles Harbor.

What's happening

Project Macoma will release approximately one quart (32 fluid ounces) of EPA-approved Rhodamine WT dye over a 10-hour period, beginning at approximately 7 a.m. This small amount of non-toxic dye helps us understand water movement and mixing patterns at the project site during different tidal conditions.

The study is a requirement of our National Pollutant Discharge Elimination System (NPDES) permit (WA099105), issued by the Washington State Department of Ecology. The data collected will verify the water mixing models developed during our permitting process.

What to expect

If you're near Terminal 7 on July 2, you may notice:

• A small research vessel with scientists collecting water samples
• Informational signs posted near the project site
• A faint pink tint in the water very close to the discharge point, though the dye will likely be too diluted to see

The dye will dissipate naturally within hours after the release ends. Our sensors will continue monitoring water conditions after the study to ensure complete dispersion.

Safety

Rhodamine WT is a well-established tool for in-water studies:

• It is EPA-approved and non-toxic
• It is safe for marine life, birds, and aquatic plants
• It has no impact on drinking water or shellfish harvesting
• At the concentrations we're using, the dye will likely be invisible to the naked eye beyond a small radius at the discharge point

Impact on harbor activities

There should be no impact to normal harbor activities:

• Recreation, fishing, and other nearshore activities can continue as normal
• We selected July 2 specifically to avoid conflicts with community programs, including nearby youth sailing activities

Regulatory oversight

• Project Macoma has received all necessary local, state and federal permits, including a first-of-a-kind NPDES permit
• The study plan has been reviewed and approved by the Washington State Department of Ecology
• All activities comply with EPA and OSHA regulations
• Results will be submitted to the Department of Ecology and made publicly available through the PARIS database

About Project Macoma

This mixing water study supports Project Macoma, a pilot project designed to reduce ocean acidity and remove excess carbon dioxide pollution from the atmosphere. By carefully studying water movement patterns, we ensure our operations meet the highest environmental standards.

Stay informed

We appreciate the Port Angeles community's continued support as we work together to address climate change and protect ocean health through responsible, science-based solutions. For questions about the July 2 water study or Project Macoma, please contact us at [email protected].