Expert Engineering Solutions

At GDM Engineers, we take pride in supporting and fostering strong partnerships with both Public and Private Sector clients throughout the Pacific Northwest. Whether working with residential landowners, rural communities, or large urban hubs, we deliver the same unwavering dedication and expertise to every project. Our goal is to ensure that all our clients—regardless of size or scope—are well-served and positioned to move forward with confidence and success.

Engineering Services Offered

Our Core Competency: Water Resource & Environmental Engineering

As a critical component of project development, GDM Engineers delivers comprehensive Plans, Specifications and Estimate (PSE) packages designed to ensure your project is completed on time, within budget, and to the highest standards. Our meticulous approach combines precision, technical expertise, and attention to detail, streamlining project planning and execution. From conceptual design to construction-ready documents, our PSE services set the foundation for success, providing clear, actionable plans, detailed specifications, and accurate cost estimates that empower your project team to move forward with confidence.

• Detailed construction drawings tailored to meet project and regulatory requirements.

• Includes site layouts, grading and drainage plans, stormwater management systems, and utility designs.

• Advanced CAD technologies for visualization and seamless integration with project teams.

  Benefit: Accurate, clear plans that eliminate ambiguity and ensure a smooth construction process.

• Comprehensive technical documentation outlining materials, methods, and performance standards.

• Prepared using CSI MasterFormat and other industry standards for uniformity and compliance.

• Tailored to reduce construction risks and ensure quality control.

  Benefit: Well-defined specifications that bridge the gap between design and construction.

• Reliable cost estimates covering materials, labor, equipment, and contingencies.

• Quantity takeoffs and cost breakdowns using up-to-date pricing databases.

• Support for competitive bidding and effective project budgeting.

  
  Benefit: Transparent, realistic estimates that keep your project on track financially.

Plans

Specifications

Estimates

At GDM Engineers, water resources and environmental engineering are at the heart of what we do. With decades of experience, we provide innovative and sustainable solutions that address the complexities of managing water systems and protecting natural resources.

• Stormwater Management: Designing sustainable systems to control runoff and improve water quality.

• Hydrologic & Hydraulic Modeling: Advanced analysis for precise water flow and system behavior predictions.

• Environmental Compliance & Permitting: Ensuring projects meet all regulatory requirements while minimizing ecological impact.

• Fish Passage & Barrier Removals: Promoting environmental connectivity and enhancing aquatic habitats.

• Habitat Restoration: Rehabilitating ecosystems to support biodiversity and ecological balance.

Our approach is rooted in innovation, collaboration, and a commitment to sustainability. Whether restoring habitats, improving water quality, or designing resilient infrastructure, we deliver solutions that not only meet today’s challenges but also anticipate future needs.

Expertise

Expertly Crafted Plans, Specifications, and Estimate Packages for Seamless Execution

Stormwater Pollution Prevention Plans

At GDM Engineers, we specialize in creating comprehensive Stormwater Pollution Prevention Plans (SWPPP) designed to meet regulatory requirements and protect the environment during construction. A SWPPP outlines strategies for minimizing pollution from stormwater runoff at construction and industrial sites, and it’s required for projects that exceed the governing body-defined threshold for land disturbance or impervious surface creation.

Mitigating Pollution

Legal Requirements

Who Needs a SWPPP

Stormwater runoff can be a major contributor to water pollution if not properly managed. As surface water or rainwater flows over impervious surfaces—such as concrete, asphalt, and rooftops—it picks up pollutants like sediment, oil, chemicals, and debris. This runoff can then flow directly into nearby water bodies, harming water quality and degrading natural resources. Implementing a SWPPP helps to prevent this pollution by detailing the control measures needed to either contain or treat stormwater runoff before it can impact the environment.

According to the Washington State Department of Ecology, a SWPPP is required if:

• The project disturbs one acre or more of land through clearing, grading, or excavation.

• The site is part of a larger development disturbing one acre or more.

• The site discharges stormwater into state waters and is a significant pollutant contributor.

• There’s a risk of stormwater runoff that could enter surface waters.

Non-compliance can lead to severe penalties, including fines or suspension of operations.

The National Pollutant Discharge Elimination System (NPDES), which is part of the Environmental Protection Agency’s Clean Water Act, enforces SWPPP requirements. Under NPDES, any site that discharges pollutants through stormwater must obtain a permit and follow specific measures outlined in the SWPPP to regulate stormwater discharge.

Contact us to learn more about how we can assist with your SWPPP requirements!

A comprehensive SWPPP contains several critical components designed to ensure effective management of stormwater pollution:

• Site Description: Outlines the site’s general layout, land use, and construction or industrial activities.

• Site Map: Includes detailed drainage patterns, areas of land disturbance, and locations of stormwater control measures.

• Potential Pollution Sources: Identifies areas where pollutants could be introduced, such as material storage, waste disposal, and equipment maintenance areas.

• Control Measures: Specifies methods for preventing pollutants from entering stormwater, including structural and non-structural controls.

• Inspection and Maintenance: Establishes protocols for ongoing inspections and maintenance of stormwater controls to ensure effectiveness.

• Plans for Keeping Up-to-Date: Details how the SWPPP will be updated to reflect regulatory changes or modifications to the project.

Components of a Stormwater Pollution Prevention Plan

Project Management

Exceptional project management is at the heart of every successful endeavor. With over two decades of experience managing projects, we understand that delivering superior results requires meticulous planning, clear communication, and an unwavering commitment to excellence.

Our project management approach is rooted in:

• Strategic Planning: We develop comprehensive project roadmaps, aligning every phase with client objectives, regulatory requirements, and budget constraints.

• Technical Expertise: Our team leverages advanced engineering knowledge and state-of-the-art tools to address challenges and ensure technical precision.

• Collaborative Leadership: We work seamlessly with clients, contractors, and stakeholders, fostering open communication and teamwork to achieve shared goals.

• Quality Assurance: Each project is executed with a strong focus on quality control, ensuring that every detail meets our high standards and exceeds client expectations.

• Timely Delivery: We prioritize efficient scheduling and proactive problem-solving to keep projects on track, meeting deadlines without compromising quality.

Civil engineering projects involve a series of structured stages, each critical to ensuring successful outcomes. At GDM Engineers, we guide clients through every phase with precision and expertise:

1. Conceptual Planning

2. Preliminary Design

3. Detailed Design & Engineering

4. Permitting & Approvals

5. Procurement & Bidding

6. Construction Management

7. Project Close-Out

8. Post Construction Support

From initial concept to final implementation, we take pride in managing civil engineering projects that enhance communities, respect the environment, and create lasting value. Whether it’s water resource solutions, environmental restoration, or complex infrastructure developments, GDM Engineers is your trusted partner in bringing your vision to life.

Inspection

At GDM Engineers, we provide meticulous construction inspection services to ensure your project is built to the highest standards. Our experienced inspectors work collaboratively with contractors, engineers, and stakeholders to verify compliance with design specifications, building codes, and environmental regulations.

From groundbreaking to project closeout, we oversee critical aspects such as site grading, utility installations, structural components, and erosion control measures. Our proactive approach identifies and resolves potential issues early, reducing delays and controlling costs.

With a focus on accuracy, safety, and quality assurance, GDM Engineers delivers the expertise you need to transform designs into durable, sustainable infrastructure.