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The Washington State Department of Health (DOH) cioss connection regulations require water <br /> purveyors, such as Everett, to maintain safe drinking water by taking prer.autions to ensure that 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, DOH has determined that double check detector assemblies (DCDA) are khe <br /> minimum acceptable backflo�v protection device for commercial fire protection systems. Some <br /> commercial buildings in Everett still have single check-valves installed, which now must be upgreded to a <br /> DCDA for commercial f::e 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��-�. <br /> Tim Markham, WQCO <br /> Cross Connection Specialist <br /> cc: Permit Services Manager Paul McKee, Ass%stant Fire Marshal Jim Venturo, Utilities Records Manager <br /> Verl Sly, Meg Haley <br /> CITY OF EVERETT • 3200 Cedar Street • Everett, WA 98201 • (425) 257-8800 • Fax (425) 257-8882 <br />