2211 GIBSON PL Geotech Report 2023-04-06

• August 18, 2014 Gibson Bluff L&A Job No. 14-056 Page 10 Intercepting ditches or trench drains should be installed around construction areas, as required, to intercept and drain away storm runoff and near-surface groundwater seepage. Water captured by such ditches or trench drains should be discharged into a nearby storm inlet. The storm inlet should be covered with a non-woven filter fabric sock to prevent sediments from entering the storm sewer system. The filter sock should be cleaned frequently during construction to prevent clogging, and should be removed after completion of construction. Spoil soils should be hauled off of the site as soon as possible. Spoil soils and imported structural fill material, if any, should be stored separately on site and covered with plastic tarps securely weighted down with sandbags. Excavation and Fill Slopes Under no circumstance should excavation slopes be steeper than the limits specified by local, state and federal safety regulations if workers have to perform construction work in excavated areas. Unsupported temporary cuts greater than 4 feet in height should be no steeper than 1 H:1 V in topsoil and weathered soil, and no steeper than 3/4H:1V in the underlying medium-dense to dense Esperance sand soil. The soil units and the stability of cut banks should be verified by a geotechnical engineer during excavation. Permanent fill embankments required to support structural or traffic load, if any, should be constructed with compacted structural fill placed over the underlying, undisturbed, medium-dense to dense, advance outwash sand soil after the surficial unsuitable soils are LIU & ASSOCIATES, INC.