HWA conducted a geotechnical engineering investigation to support the design and construction of the marine outfall. It extended in excess of 5,000 ft offshore and terminated in a diffuser section approximately 600 ft below sea level. The near shore section of the outfall pipe was placed in a trench, and the offshore portion was placed directly on the sea floor.

HWA provided geotechnical services for the design of a new sewer system for Twanoh State Park. The work included a new collection system throughout the park, a new pump station and force main to transport sewage to the new septic tanks. Our work included assessing the application rate of the existing drain field. Borings and test pits were performed to characterize soil and ground water conditions in the park.