About the Firm
Experience counts.
RAK Civil Engineers is a family-owned and operated firm delivering comprehensive civil engineering services throughout California — for educational institutions, public agencies, and private developers alike. Our engineers, project managers, designers, and technicians bring together more than 60 years of combined experience.
Our History
A legacy begins
The firm's roots trace back over 75 years — through Edward P. Schwafel, Bissell & Karn, and Greiner — building a strong reputation for reliability and technical excellence.
Robert A. Karn & Associates
The company became Robert A. Karn & Associates, Inc., further solidifying its presence and reputation across the region.
RAK Civil Engineers
Now led by the Petrini family, the firm builds on that legacy with modern technology and progressive design — while keeping a responsive, client-first approach.
Our Approach
Successful projects start with thoughtful planning, clear communication, and strong client relationships.
We combine practical experience, innovative design, and modern technology with a commitment to integrity and responsive service — delivering efficient, reliable engineering solutions built to last.
Leadership
Justin Petrini, PE
Principal Engineer
Leads the firm today, carrying forward a multi-generational engineering legacy with modern, forward-thinking design.
Gene Petrini, PE
Principal
Brings over 40 years of experience in land development and construction throughout Northern California.
Capabilities
A broad range of civil, land, and consulting services.
- Civil engineering design and consulting
- Conceptual and preliminary engineering studies, including feasibility analysis
- Land planning and development services
- Site and project due diligence
- Project management assistance and construction administration
- Multidisciplinary project coordination — architects, licensed land surveyors, geotechnical engineers, utility providers, and public agencies
- Mapping and survey coordination — parcel maps, lot mergers, lot line adjustments, ALTA/NSPS, boundary, topographic, records of survey, construction staking, and FEMA Elevation Certificates through licensed Professional Land Surveyors
- Grading, drainage, stormwater management, and erosion control plans
- Stormwater Pollution Prevention Plans (SWPPP) and Qualified SWPPP Developer (QSD) services
- Commercial, industrial, public works, multifamily, residential subdivisions, single-family, apartment, and private homeowner projects
- ADA-compliant site design and retrofit improvements per the California Building Code
In the Community
Rooted in the communities we serve.
We're proud members of our local chambers of commerce and support organizations that strengthen Solano County — including Leaven, which helps local kids succeed.
Chamber of Commerce
Chamber of Commerce
Society of Civil Engineers
Community Partner