Phone: 425.415.0551

Fax: 425.415.0311


Riley Group Corporate Office

17522 Bothell Way NE

Bothell, WA 98011

© 2014 Riley Group.
All rights reserved.

Maple Valley Town Center Redevelopment

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This project included redevelopment of a several acre former lumber yard located in Maple Valley, Washington for use as a multi-tenant retail center anchored by Fred Meyer.

In addition to providing full-service environmental services, RGI was the geotechnical engineer-on-record and completed the geotechnical investigation, design, and on-site construction monitoring during earthwork.

Geotechnical challenges for this site included cobbles and boulders encountered during field investigation. An infiltration system was necessary for stormwater disposal, including an infiltration pond and pervious pavements.


Geotechnical services included:

  • Characterization of soil and groundwater conditions
  • Seismic considerations
  • Site preparation and grading
  • Excavation, foundation, and slab-on-grade support
  • Retaining wall recommendations
  • Drainage requirements
  • Utilities and pavement recommendations

Construction monitoring services included:

  • Grading and compaction
  • Slab and foundation subgrade evaluation
  • Utility installation and backfill
  • Infiltration systems