About the Proposed Project

Project Overview

• 990-acre aggregate (gravel) mine and asphalt plant (p. 2)*
• 4 or 5 pits (app. A p. 5, app. Gp. 2) *
• 50-55 million yd’ of material removed (p. 7)*
• 25-35 years of operation (p. 2)*

Hours of Operation (p. 19)*

Mining activities:

7:00am – 5:30pm, 7 days a week

Asphalt plant operations:

7:00am – 4:00pm & 7:00pm – 4:00am, 7 days a week Truck traffic:

7:00am – 4:00pm & 7:00pm – 4:00am, 7 days a week

Maintenance of crusher, wash water system, asphalt plant, yard operations:

24 hours a day, 7 days a week

Water Usage (p. 11)*

• Use of up to 250,000 gallons of water per day

Traffic (p. 30)*

• Approximately 298-668 vehicle trips per day
• Up to 93 trips during peak afternoon & nighttime hours of site operation

*All information about the proposed project is publicly available in the SEPA Checklist documents submitted by the applicant to King County. Project number: GRDE23-0083 for documents.

Anticipated Impacts

Surface and ground water degradation

• Contaminated municipal water supply and private wells
• Decreased quality and quantity of water entering the Green River
• Less clean and cold water entering the river for salmon
• Downstream impacts to Green-Duwamish River water quality

Increased Traffic

• Amount & hours of truck traffic
• Degradation of roads & bridges exceeding King County’s ability to maintain and repair
• Incompatible use of roads with dump trucks with intensive seasonal recreational road uses

Increased Noise

• On site and roadway truck noise-especially at night
• Equipment and processing from mine operations

Endangered Fish Survival

• Jeopardize existing fish habitat, including millions of dollars of completed restoration projects
• Compromise viability of wild and hatchery fish (2 local hatcheries) migrating upstream
• Potential decrease in endangered salmon and steelhead populations

Fire Risk and Emergency Services

• Risk of asphalt plant fire
• Increased forest fire risk to adjacent public and private forest lands from mining operations and asphalt plant fire
• Limited local emergency service resources to respond to accidents, chemical spills, and fires

Reduced Air Quality

• Emissions from asphalt plant
• Dust from mining & processing

Reduced Recreational Quality

• Project site located between 2 heavily used state parks, impacting quality and safety of recreational experience
• Mining operations will eliminate access to public lands

Mining and Asphalt Plant Operations

• 250,000 gallons per day process water trucked in
• Potential use of local roads for on-site material circulation
• Chemical and fuel trucks for asphalt production

Displaced Wildlife

• Wildlife habitat loss
• Increase in roadkill