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The Washington State Department of Health (DOH) cross connection regulations require wzter <br /> purveyors, such as EverE:t, to maintain safe drinking water by taking precautions to ensure that fi�e <br /> protedion water in both commerciai and residential sprinkler systems dces not backflow into the public <br /> systen:. Tn the past, single check valves were considered as an adequate backflow device for commercial <br /> properties. However, DOH has determined that doubte check detector assembiies (DCDA) are the <br /> minimum accep!able backflow protection device for commercial fire protection systems. Somc <br /> commercial buiidings in Everett still have single check-valves installed, which now must be upgraded to a <br /> DCDA for commercial fire services when new construction is planned that will affect fire services. This <br /> additional protection is necessary to adhere to DOH regulations and ensure safe drinking water. <br /> Sincerely, <br /> `��� W��.a,r-�-�.`'� <br /> m M ra kham, WQCO <br /> ross Connection Specialist <br /> cc: Permit Services Manager Paul McKee, Assistant Fire Marshal Jim Venturo, Utilities kecords Manager <br /> Verl Sly, Meg Haley <br /> CITY OF EVERETT • 3200 Cedar Slreet • Everett, WA 98201 • (425)257-8800 • Fax(425) 257-8882 <br />