2707 COLBY AVE BASE FILE 2018-01-02 MF Import

BUREAU OF BUILDINGS POLICY AND PROCEDURE MANUAL Title Secondary Supply or Water Requirement of U.B.C. Section 1807 BUILDING CODE SECTION: 1807(c) 2. Procedure No 0-52 Da to 01/02/86 In seismic zones No. 2, No. 3, and No. 4, in addition to the main water supply, a secondary on -site supply of water . . . shalt be provided. This supply shall be automatically available if the principal supply fails and shall have a dura- tion of thirty mir '�s. DISCUSSION: In the downtown area of the City there is a water supply grid consisting of various sized water pipes originating from different mains and located on two or more sides of a block. The water mains are, in turn, supplied from various reservoirs and tanks. If one source is disrupted, the grid will still be supplied by the others. A commonly proposed alternate to the code requirement is to connect two lines from the building to this grid. The two connections are separated by a valve on the grid. POLICY: Because of seismic considerations and the need to manually operate the separating valve, this alternate is not considered to be equivalent to that prescribed by the code for new buildings. However, it can be considered for older, renovated buildings, provided that the connections to the water grid system be separated as far as practical and that the connections to the building be flexible enough to allow relative displacements at the soil/structure interface. Responsible Office IPermits Manager Distribution All Sections Issued By Margaret Mahoney