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