The Tahoma National Cemetary Phase II Development, located on 18600 SE 240th Street in Kent, WA, utilizes the StormTech MC-4500 chamber system for subsurface stormwater damage. Designed as part of a water quality system for wetland mitigation the chambers provide a cost effective solution to this sensitive problem. By utilizing StormTech chambers, the project was able to meet the regulatory requirements for stormwater detention storage.
Approximately, 43,097 cubic feet of stormwater will fill the 253, 5′ tall chambers, 18 endcaps and surrounding stone. In addition, the design incorporates a thermoplastic liner to limit infiltration. The StormTech chambers are designed and installed in accordance with AASHTO LRFD and applicable ASTM Standards, providing live and dead load (long-term) safety factors and superior structural integrity. Additionally, ADS-N-12 polyethylene pipe was utilized for conveyance and the StormTech manifolds, ultimately saving money and time.
The G.C. was US Builders Group. The installing contractor was Ceccanti Inc., and the engineer is KPFF Consulting Engineers.