Geotechnical Engineering Study for Recycled Water Pipeline System Extension for Various Streets (2017)
The project included an extension of a proposed recycled water pipeline in six different streets within the City of South Gate. The total length of the project was approximately 22,500 feet, about 4.3 miles. The client for this project was CBMWD, and SA Associates, the prime consultant, retained GAI’s services. GAI performed a comprehensive geotechnical engineering study to extend the proposed pipeline. Our scope included performing soil investigation to determine soil suitability for construction and trench safety, determining substrata profile within the length of the project, and providing design parameters including soil pressure for shoring design. GAI conducted a total of 21 borings by utilizing a hollow-stem truck-mounted drilling rig, and the borings were advanced to a minimum of 15 feet below the grade or 5 feet below the pipe invert. The streets where borings were conducted included numerous underground utilities and high-pressure lines, which required careful supervision of drilling operations. Soil samples were tested for characteristics and strength determination. After analyzing the laboratory results, GAI prepared a final report that included our recommendations for designing and constructing the proposed recycled water line from a geotechnical engineering standpoint.
LOCATION: South Gate, CA
AGENCY/CLIENT: Central Basin Municipal Water District (CBMWD)/SA Associates