Kenall provided geotechnical engineering services to the City of Pasadena to evaluate the stability of the Richey Road detention pond. The evaluation was needed because the site slopes had breached due to heavy lateral earth pressure from the stored sludge.
Our investigation included a visual site inspection, multiple soil borings to evaluate subsurface stratigraphy and groundwater conditions, and the installation of wellpoint control systems to observe water level variations. We performed comprehensive laboratory soils testing. Our geotechnical engineering analyses included analysis of test results, site geological evaluation, total and differential settlement analysis, and slope stability analysis for the existing conditions. We provided recommendations for the reconstruction of slopes with factor of safety, recommendations for de-watering, and general construction recommendations.