Levee Seepage Repair Phase III Reclamation District No. 17 – Mossdale Tract

Reclamation District No. 17 (RD17) is located along the east bank of the San Joaquin River in the southeast corner of the San Joaquin Delta.  RD17’s levees provide flood protection for the Cities of Stockton, Lathrop, and Manteca, as well as the unincorporated French Camp area.  In response to extensive levee seepage and boils that occurred during a high-water event in January 1997, RD17 initiated a Levee Seepage Repair Project (LSRP) in 2007 in collaboration with the Department of Water Resources’ Early Implementation Program.  The first two phases of the repair project consisted of constructing drained seepage berms along the landside levee toe at nine District sites.  Three of the of project sites were located in developed urban areas within the City of Lathrop.  Seepage berm design in the urban areas included drainage trenches constructed at the landside toe of the berm where seepage flow collects and is conveyed into the existing City storm drain system.  As part of the District and DWR’s ongoing flood maintenance procedures RD17 also installed nine piezometers in one of the urban berms to measure seepage pressure during high-water events in order to monitor the continued performance of the berms.  Kjeldsen, Sinnock & Neudeck, Inc. (KSN) is represented as both the district engineer and the prime consultant under contract with RD 17 for the LSRP.  Working in collaboration with design engineers McKay & Somps and geotechnical engineers ENGEO, KSN provided guidance in the preparation of the civil improvement plans and geotechnical reporting, project construction specifications, and overall project and construction management.  KSN also provided grant management, utility research, surveying, and right of way mapping and acquisition services for the project.  The first two LSRP phases were completed in 2010, Phase 3 is estimated to begin construction in 2017 with a total project cost of approximately $62,000,000.

Project Highlights
  • Reclamation District No. 17 – Mossdale Tract
  • San Joaquin County, California
  • $62,000,000