Township engineer: Sentinel Point retaining wall designed conservatively but testing record incomplete
Township engineer told the planning commission the Round Hill retaining wall is a mechanically stabilized earth wall built for residential-grade conditions; soil borings suggest marginal soils and testing records are incomplete, and the engineer urged on-site testing and observation if stronger assurance is needed.
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The township engineer told commissioners that the retaining wall at the Round Hill portion of the Sentinel Point PUD is a mechanically stabilized earth wall with a rock face and geogrid reinforcement, designed conservatively for the on-site soils but described as "residential grade." He noted the engineer's lifespan analysis put a range of roughly "10 to 60 years" depending on conditions and that the available paper trail did not include all materials-testing results.
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