OICC, Bldg. 262, Naval Weapons Station, Concord, 10 Delta St., Concord, CA 94520-5009

Z -- REPAIR CHLORINATION SYSTEM FOR THE BASE SWIMMING POOL AT THE NAVAL WEAPONS STATION, CONCORD, CALIFORNIA Sol. N62474-96-Q-6522. Due 041196. Contact Dina Moore, 510/246-2425, Contracting Officer, Thomas A. Chin. Elements of work include furnishing supervision, equipment, materials, labor and transportation required to repair chlorination unit at the Base swimming pool at the Naval Weapons Station, Concord. The Contractor shall provide all the supervision, transportation, equipment, tools, material, supplies, and labor necessary to repair the existing Chlorination system by replacing with a new, fully integrated, Chemical Automation system. The new Chlorination control system shall be the latest commercial design together with all the manufacturer's recommended accessories necessary for a complete installation for a 78 commercially-sized swimming pool. The equipment provided in the installation shall meet all the local codes and regulations. All equipment being replaced shall be new. The existing Chlorination Control System is to be removed an disposed of off station and consists of the following major parts: 3 Portable Tanks (Chlorine Gas, pH, Salt); 4 Power Supply & Timers (Chlorine Factory Model C-40); 2 Granular Activated Carbon Filters; 1 Pump (3/4HP, 115/23Ovac, sgl phase - 3450rpm); 8 cells and associated piping; miscellaneous piping is PVC type; miscellaneous electrical circuit breakers and wiring (low voltage). The New Chlorination System: The new system shall be a fully integrated chemical automation system for continuous monitoring of water chemistry and automatic control of the active sanitizer and pH levels in the swimming pool. SWIMMING POOL: The existing swimming pool is a commercial size pool that holds approximately 110 thousand gallons of water. The filters are sand filters, sized as shown, and are the gravity-operated type with a turnover rate of approximately 8 hours. The station opens the pool for personnel use around the end of May (Memorial Day) and closes around September (Labor Day). The water is kept in the pool throughout the year. NEW SYSTEM FEATURES: The new chemical system shall utilize a pump system for Pump for a liquid injection type using sodium hypochlorite and carbon dioxide or similar. The control system shall automatically activate the appropriate chemical feeders in order to maintain the proper levels of Sanitizer (PPM) and pH. Setpoint selection shall be by direct dialing on the controller cabinet on scales calibrated in PPM and pH units and shall limit operator selection of operating values within a sanitizer range of 0.3 to 6.0 PPM and a pH range of 7.0 to 8.0. The controller shall be capable of considering both flow and demand and have the additional feature of automatically cleaning the probes (ORP and pH) to assure long term accuracy without manual disassembly for cleaning. CHEMICAL SUPPLY: The tank and storage drums shall be located adjacent to the pool heater in an area designated as the Equipment Room. The transfer pump, to be provided, shall be portable to set on the 55 gallon supply drum and used to transfer chemicals to the chemical solutions tank also being provided. The chemical solutions tank size and material type shall be per manufacture's recommendations required for the size of the existing commercial size pool. The quantity of 55 gal drums to be stored in the Equipment Room shall be numbered sufficiently for one month's operation. ADDITIONAL WORK REQUIRED INCLUDES: (1) Demolition: Remove the existing concrete slab at grade in the area of the designated Equipment room to allow room for the construction of the slab on grade extension from the Heater Room. Also, excavate and trench for the new interconnection piping that will run from the Equipment Room to the Pump and Chlorination Control Room. There will be a requirement for sawcutting the concrete when doing the trenching work for the interconnection piping. The size and the final trench length will be directed by the size and number of the interconnection piping and on where the Contractor locates the equipment in the Equipment Room. 2) Slab on Grade: The base granular fill must be uniformly compacted material such as gravel or crushed rock. The concrete shall be placed on top of the base granular fill with reinforcement provided to maintain tightly closed cracks. Provide isolation joints to allow horizontal and vertical differential movement. Additional formwork shall be provided for the transition of interconnection piping that will be trenched from the Equipment Room to the Pump and Chlorination Room. The slab will be an extension of an existing Heater Room slab that is located outside at ground level. There is a metal frame/wood slate fence that is currently around the perimeter of the Heater Room. The extension slab shall house the major equipment to include the 55 gal supply drums, transfer pump, tank and appurtenances needed for the chemicals to be used in the new Chlorination system. The extension slab shall have a curbing sized for secondary containment for chemical spillage. The size of the curbing will be dependent on the chemical capacity being stored. Additionally, a ramp for hand-truck transporting of the drums shall be constructed. The new fencing will enclose the Equipment Room and will contain a doublewide gate (approximately 10'-0''). A clearance (5 foot minimum) shall be maintained between the Heater, Chemical Solutions Tank, and Drums both storage and active for the purpose of safety and maintenance work. The roofing structure over the Heater Room may be duplicated and/or modified to extend over the adjacent Equipment Room that is being constructed. The former Chlorination Control System partly consisted of -chlorine tanks, soda ash tank, mixers, pump, controller, piping and conduits in the Equipment Room adjacent to the Heater Room. A chain link fence with a lockable gate went around the perimeter of this room. Presently this room and the remaining parts are not being used. The remaining parts include a slab on grade (right at ground level), capped conduit, and fence posts cut at grade. The swimming pool perimeter chain link fencing will require a new location for a single-wide entrance gate for personnel using the swimming pool. Its location will be field determined at the time of construction. The existing personnel entrance gate will be used as an entrance to the newly constructed equipment room from the swimming pool side. (2) Piping: New interconnection piping from the Equipment Room to the Pump and Chlorination Room for chemical solution injection from the Chemical Solutions Tank to the existing system piping and Chemical Control Monitor Cabinet shall be routed underground via a trench. ADDITIONAL INFORMATION: Work shall be performed per the manufacturer's recommendations for the installation of a Chemical Automation System. CLEAN-UP: The Contractor shall remove all job related debris from WPNSTAC property, and shall transport and dispose of the same in full compliance with all pertinent requisitions. To obtain copies of the Scope of Work or to arrange for a site visit call (510)246-2425. Quotes are due 11 April 1996. Send quotes to Officer in Charge of Construction, Naval Weapons Station, Bldg 262, Concord, 10 Delta St., Concord, CA 94520-5100. The Scope of Work and Drawings will be available March 29, 1996. The SIC code is 1799, the related small business standard is $7.0 million. The resulting contract will be a firm fixed priced contract. Estimated construction cost is between $25,000 to $100,000. The period of performance is 30 days from award. (085)

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