B-3452 Backflow Preventer

There is currently no existing required backflow prevention on the incoming 8” main water line in the mechanical room at Bldg. 3452 (NEX). (picture available) This deficiency was identified by the last BFP survey done in the early 90's with the deficiency location number (# 511) still seen on the 6" Victaulic tee. Also likely is a Siamese connection for pumper truck operation somewhere in the system. Presently this line provides potable and fire sprinkler water to the facility. There is no backflow prevention of any kind on the sprinkler main, not even any check valves below the alarm valves. Failure of the outdated alarm valves to provide 100 % system separation has the potential (high) to allow the sprinkler system water to contaminate the potable water system supply by either back pressure or back siphonage. This is and should be considered a high hazard cross-connection and requires immediate correction. Project should include reconfiguring the main water supply line to add for compliance: 1-8” RPZ Backflow Preventer on the fire main supply connection 1-4” RPZ Backflow Preventer on the potable main water supply Further recommendations: Possible upgrade of the sprinkler flow alarm system from existing “clapper” style alarm valves to the more common “manifold/check valve” configuration now installed for most new construction. These valves are 37 yrs. old, hard to acquire replacement repair parts for and costly to maintain requiring an expensive yearly PM. Upgrading the two system main shut-off valves (picture also available). Presently these two fire main shut-off valves extend through the wall of the mechanical room to the outside. Bldg. 3452 is outside any secure perimeter and neither valve appears to have any kind of locking mechanism commonly seen on almost all post-indicator above ground fire main sh ... NOTE: description has been truncated, please see Project Note for full description.