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. - <br /> Nr. Joh� Switier <br /> April 3, 1990 <br /> Page 2 <br /> University of Soutl�ern California Foundation for Hydraulic <br /> Research and 9ackfloa Prevention about this case. They were <br /> adamant that an RP device be installed on the dialysis line. <br /> Subsequent to these discussions, I notified you by phone and in <br /> writing of the decision. I also arranged for a 30 day temporary <br /> occupancy permit so that you had time to investigate less <br /> expensive alternatives for the installation of the RP device. <br /> 3.) The single check valve used in the dialysis equipment is not <br /> approved for backflow prevention by the Washington State <br /> Department of Health, or by regulators in any other state. <br /> 4.) Vacuum breakers are not approved for backflow prevention when <br /> there is potential for pump back, or when the potential hazard is <br /> high, such as in the case of dialysis equipment. <br /> 5. ) You called my attention to the fact that dialysis machines were <br /> used in private residences. Thank you for that information. I had <br /> not previously considered this aspect. We will be informing all <br /> persons using dialysis equipment in their residences of the <br /> requirement for backflow protection witf� an RP device. <br /> 6.) Please recognize that the City's primary role in backflow <br /> �revention is as a regulator, ot� policeman. While we do our best <br /> to plug in as early as p.>sible in a project, it is the specific <br /> responsibility of your plumbing designer to know the codes and <br /> regulations. The industry standard for backflow prevention as it <br /> relates to dialysis equipment is to isalate the water supply line <br /> to the dialysis machine with an approved RP device. This is well <br /> known and practiced throughout the country. Additionally, the <br /> city only signs off on exterior plumbing plans. We do not review <br /> interior plans. Probably due to the huge potential for field <br /> changes. Thus we inspect and approve/disapprove interior plumbin9 <br /> schemes during and after construction, as do other cities. The <br /> result is that an owner depends on the desigr.er and plumber to <br /> deliver an acceptable system. <br /> I ha� � asked Bill Bruce to work with you en this matter if you wish his <br /> assistance. If you have any questions, please do not hesitate to call me at <br /> �59-8800. Thank you for your cooperatioii. <br /> �Si erely, <br /> ��� <br /> Dan Lowell <br /> Utilities Operations Suot. <br /> cc Jerry Vrooman <br /> Larry Crawford <br /> Tim Tyler <br /> file <br /> ,,,P�.,��.�>.,. <br />