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i <br /> The Washington Scate Depzrtment of Health (DOH) �ross connection regulations require wzter <br /> purveyors, such as i3erett, to maintain safe drinkirg water by taking preceutions to ensure that fire <br /> protection water in both commercial and residential sprinkler systems does not bac!:Fio�v into tlie public <br /> system. In the past, single check valves were considered as an adequate backflo�;� device fer mmmercial <br /> properties. However, DOhi has determi�ied that double check detector assemblies (DCDA) are the <br /> minimurci acceptabte backllow rr:,�:ection device for commercial fire protection systems. Some <br /> commercial buildings in Eve.c:i still have single check-valves installed, whir.h now must be upgraded to a <br /> DCDA for commerciai F;e services when new r_onstruction is planned that will affec:t fire services. This <br /> additional protect!;,r, is necessary to adhere to DOH regulations and ensure safe drinking �Nater. <br /> �incerely, <br /> � w��.�,r-�l�-,., <br /> Tim Markham, WQCO <br /> Cross Connection Specialist <br /> cc: Permit Services Manager Paul McKee, Assistant Fire Marshal �im Venturo, Utilities Records Manager <br /> Verl Sly, Meg Haley <br /> . .. <br /> CITY OF EVERETT • 3200 Cedar Street • Everetl, WA 98201 • (425) 257-8800 • Fax(425)�57-8882 <br />