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The Washington State Department o� Health (DOH) ooss connection regulacions require water <br /> purveyors, such as Everett, to mair�tain safe drinking water by taking precautions to ensure :hat fire <br /> protection water in both commercial and residential sprinkler systems does not backFlow into the public <br /> system. In the past, single check valves were considered as an adequate backflow device for commercial <br /> properties. However, DCH has detErmined that double check detector assemblies (DCDA) are the <br /> minimum acceptable backFlow protection device for commercial fire protedion systems. Some <br /> commercial buildings in Everelt sfill have single check-valves installed, which now mus[ be upgraded to a <br /> DCDA for commercial flre services when new conslruc[ion �s planned that wiil affect fire services. This <br /> additional prctedion is necessary to adhere to DOH regulations and ensure safe drinking water. <br /> Sincerely, <br /> � ���-�-,-_ <br /> Tim Markham, WQCO <br /> Cross Connection Specialist <br /> cc Permit Services Manager Paul McKee, Assistant Fire Marshal Jim Venturo, Utilities Records Manager <br /> Verl Sly, hleg Halcy <br /> CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425) ?57-8800 • Fax (425)257-8882 <br />