Coffman Excavation is your premier contractor for excavation, site preparation and heavy civil projects in the Northwest. Our ... specialty is fast-tracking complex projects while maintaining the highest level of safety and professionalism. We team closely with general contractors, owners and designers. Our wide range of experience and collaborative approach has afforded us an extensive network of long-lasting relationships and repeat customers. Since 1979, we have completed many of Portland’s most challenging and high-profile projects. Our capabilities include: - Site preparation - Mass excavation - Design build - Street and road construction - Port infrastructure - Utility installation - Demolition - Emergency response and slide repair - Environmental remediation and bank stabilization - Septic systems read more