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The Washington State DepaAment of Health (DOH) cross connection regulations require v�a[er <br /> purveyors, such as Everett, to maintain safe drinking water by taking precautions to ensure that fire <br /> protection water in both commercial and residential sprinkler systems dces not backflow into the public <br /> system. In the past, single ch�ck valves were considered as an adequate hackflow device for commercial <br /> properties. However, DOH has determined that double chec4: detedor assemblies (DCDA) are the <br /> minimum acceptable backflow protection device for commercial fire protection systems. Some <br /> commercial buildings in Everett still have single check-valves installed, w'iich now must be upgraded to a <br /> DCDA for commercial fire services when new construc[ion is planned tYat will aHed flre services. This <br /> additional protedion is necessary to adhere to DOH regulations and ensure safe drinking water. <br /> Smcerely, <br /> � <br /> hh�R s-� <br /> ,�--- <br /> Tim Markham, WQCO <br /> Cross Connection Spedalist <br /> cc: Permit Services Manager Paul McKee, Assistant F,re Plarshal Jim Venture, Utilities Records Manager <br /> Verl Sly, Meg Haley <br /> CI 1 Y Of f VE RF T T • 3200 Cedar Street • EvereU. WA 98201 • (425) 257-8800 • Fax �425) 257-8882 <br />