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HomeMy WebLinkAboutMiscellaneous - Exception (474)Guidelines for the Design and Installation of Impervious Barriers Construction Construction of any impervious barrier, impervious barrier and retaining wall, or retaining wall alone, shall follow accepted engineering practice. They shall not be constructed during weather conditions that may prevent the proper installation of the structure. Extreme temperatures may affect newly poured concrete, for example, and may cause a membrane liner material to become overly inflexible, brittle or weak. Wet conditions may prevent the application of waterproof coatings or the ability to properly compact clays. Structures shall not be backfilled without inspection by the designer and the approving authority. The owner shall not modify the impervious barrier, or retaining structures without approval of the designer and without receiving appropriate approvals from the Board of Health or DEP (when DEP approval is required). Engineers, Registered Sanitarians and system installers should review and be fully aware of state and local building codes that contain requirements applicable to retaining walls and other structures used for slope stabilization. In accordance with 310 CMR 15.255(2)(e), an as -built plan shall be prepared and the designer shall certify that the impervious barrier, and/or retaining .structure has been constructed in accordance with the approved plan. These plans must be submitted to the approving authority. imp.barr.doc