Specifications include, but are not limited to: a. Scope of Work for Water Treatment Services - General 1. The pre-qualified contractor shall ensure that all required agency Chemical Water Treatment Services are managed and supervised by a Certified Water Technologist (CWT) as certified by the Association of Water Technologies (AWT) or a qualified Chemical Water Treatment Services Chemist. 2. The HVAC Water Treatment Program shall be designed by an AWT Certified Water Technologist (CWT) to meet the defined performance requirements. 3. The bidder shall be required to submit written documentation which includes a listing of service technicians responsible for the execution of job-site water treatment activities. 4. The contractor must have field staff that has been fingerprinted and passed MCPS background checks before visiting school sites. 5. The vendor will provide all labor and parts for water treatment services, including sampling and analysis. 6. As a performance goal, the contractor will chemically test and visually inspect water treatment systems associated with closed loops and cooling tower loops to maintain systems within specified ranges and water treatment equipment operating within parameters. 7. The contractor will conduct the following water analysis to ensure parameters are within acceptable ranges. The frequency of sampling/testing should be either monthly quarterly, or annually depending on the parameter(s). b. Water Analysis Specifications: Closed Loops (Boilers/chillers): a. Conductivity = 3500-4000 mm/cm maximum (glycol systems may vary) b. pH = 8-11 (dependent on inhibitor used, and system metallurgy) c. Inhibitor = Nitrite- 500-1200 ppm, Molybdenum 50 – 150 ppm (one or the other inhibitor may be used) d. Total Bacteria = < 1000 CFU (testing done when other indicators show a need) Open Loops (Cooling Towers): a. Conductivity = 1000 – 1400 mm/cm (maintain conductivity at a level that provides 4-6 cycles of concentration) b. pH = 8-9 c. Total hardness and Total alkalinity combined not to exceed 1200 ppm within the cooling tower system d. Inhibitor = 2-4 ppm Sodium Molybdate e. Total Bacteria < 10,000 CFU (testing done when other indicators show a need) f. Legionella = < 10 CFU (systems tested once per year, if found systems are sanitized)
