Cajon Air Center Underground Detention Basin

County of San Diego, Department of Public Works
Date Completed:
April 15, 2017
El Cajon, CA
Description of Project:

This project entailed excavating down and installing a two-acre underground water storage reservoir capable of holding approximately 12 acre-feet of water. The project highlights included:

  • Onsite contaminated groundwater required a water treatment system for dewatering operation
  • Placed 3,600 cubic yards of concrete slab
  • Placed 734 individual precast concrete structures
  • 66,000 cubic yards of excavation
  • Meeting airport spec compaction for subgrade / base
  • Installing two acres of Mirafi Filter fabric

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