NV5 assisted with the San Joaquin Levee Repairs Project, an ongoing effort to sustain flood system integrity and mitigate damage from floods. NV5 was hired by the U.S. Army Corps of Engineers’ construction contractor to provide geotechnical engineering and shoring design. The scope of the project included geotechnical engineering design, shoring system design, inspections, and storm water plan preparation.
The shoring design was based on the boring logs provided by the U.S. Army Corps of Engineers. NV5 provided detailed design drawings and observed and consulted during the construction. As expected, the dynamic soil conditions found on-site posed challenges. As penetration of the initial sheets reached 20′ to 30′, the zipped portions of the sheets began to melt and unzip. NV5 evaluated the conditions and determined that with 30′ of pile penetration and 5′ to 6′ of good seam above the water line, it was not necessary to continue driving. The rest of the piles continued to drive easily, allowing the cofferdam to be dewatered.
In addition to the design of the sheet wall shoring system, NV5’s Qualified SWPPP Developer (QSD) prepared a Storm Water Pollution Prevention Plan. This plan included the required Erosion and Sediment Control Plan and Construction Site Monitoring Plan (CSMP) and an initial Rain Event Action Plan (REAP).