1. Operation and Maintenance of Water Supply System (Pay Item 1) Included as a per month unit cost for operational equipment, materials and supplies as well as routine and supplementary water sample collection and analyses as specified herein. Treatment at the site consists of treatment of an average of approximately 870 gpd, softening by CSD75-122C ion exchange softening system for hardness, and reverse osmosis (RO) filtration by CSI Model DFS-12000 membrane for iron, manganese and hardness, and disinfection by sodium hypochlorite. Additionally, each RO unit (two units on site) has a pre-filtration sediment filter (CSI Model # MB520), five (5) membrane filters (Model 30-0130-XX), and the permeate is treated for pH adjustment by a CSI U25 upflow filters utilizing NE10 pH neutralizing media. The operation of water supply systems includes all pumping systems, storage tanks, softener, reverse osmosis equipment, chemical systems and appurtenances used to supply, treat and disinfect raw water for final distribution to the safety rest area building. a. Responsibilities and Duties. The operator shall determine the optimum range of operational controls and disinfectant dosage necessary to maintain adequate chlorine residual, produce the highest quality of potable water and maintain satisfactory water pressure throughout the distribution system. During each site visit, the water supply system shall be monitored and evaluated, and suitable operational adjustments implemented accordingly to optimize system performance. Routine operation and maintenance shall include, but not be limited to: i. Performing minor repairs and routine equipment inspections; ii. Checking for proper operation of the submersible well pump, softener, reverse osmosis system and chemical feed pumps; iii. Checking levels in the chemical feed tanks, softener brine tanks and preparing disinfection solution as required; iv. Maintaining no less than 0.2 mg/L chlorine residual throughout the distribution system. When a sampling point has been shown to have a free chlorine residual of less than 0.2 mg/L, the Bidders shall take all necessary corrective action to increase the chlorine residual; v. Adjusting disinfectant solution strength and/or chemical feed rates for maintaining adequate chlorine residual; vi. Adjusting permeate rate as required; vii. Replacement of the inline sediment filter monthly; viii. Replacement of the reverse osmosis filter membranes yearly ix. Replace acid neutralizer media every 6 months x. Perform O&M maintenance on the softener and reverse osmosis system in accordance with manufacturer recommendations. xi. Checking for air or water leaks in the system, verifying proper operating water levels in the hydro pneumatic tank and ensuring adequate system pressure. All records of equipment replacement or repairs shall be maintained in a daily log kept on-site in a location accessible for a 24-hour inspection by representatives of PennDOT and/or the PADEP. b. b. Equipment and Materials. The Bidders will furnish all necessary tools, equipment and materials required for the daily operation and maintenance of the water supply system. The equipment and materials shall include, but not be limited to: i. Sampling and testing apparatus and reagents; ii. Calibrated pH meter and Total Dissolved Solids (TDS) meter, sample bottles, reagents for free chlorine residual analysis, and a direct concentration readout colorimeter; and iii. NSF 60 Certified Sodium hypochlorite for water supply disinfection. iv. NSF Certified 60 Water softener salt v. ANSI/ NSF 58 Sediment Cartridge Filter (Dual Gradient, 4.5 x 9.8, 25/05 Micron) vi. Acid neutralizer media (CSI NE25 pH) vii. NSF-61 Reverse Osmosis Filters (Membrane, 4040, low pressure, 2600 GPD) The Bidders are required to obtain, properly store and effectively apply all essential chemicals in quantities as may be necessary and appropriate for adequate treatment of the raw water supply. Provisioning of equipment and materials for daily operation and maintenance will be the responsibility of the Bidders and shall be included in the Operation and Maintenance line item of the Bidders Cost Submittal.
