Girdwood Infiltration and Inflow Study

For the Girdwood, Alaska Sanitary Sewer Collection System Infiltration and Inflow (I&I) Project, Stephl Engineering developed a multi-year flow monitoring program to determine when and where excessive runoff was entering the sewers. The 160 inches of annual precipitation, combined with high snowmelt runoff and high groundwater, was increasing sewer flows into the treatment plant by threefold during peak storms. The project included rehabilitation of 450 manholes, CCTV inspections, sewer main repairs and sewer service repairs.

Specialty Services

A full-service engineering firm that specializes in trenchless technology consulting and engineering services.

Condition Assessment

Condition assessments include investigations and evaluations of an existing utility system or pipe to document its condition or cause of problems.

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Engineering Services

Our services include water and sewer planning and design, landfill expansions, infiltration and inflow studies, permitting, and construction, administration and inspection. We are proud of our past projects that are constructed in rivers and marine locations.

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Trenchless Technology

Trenchless drilling is growing quickly in the Alaskan utility market. The construction or repair of water and sewer lines using trenchless methods can be cost-effective and feasible.

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