Contractor shall notify NCEH within 24 hours if there is an event that the PWS is aware of that may affect the ability of the treatment plant to produce safe, potable water including, but not limited to, bacteriological samples containing E. coli or fecal coliform in the source water or distribution system, spills of raw sewage near the source, water outages, or significant pressure losses, or hazardous chemical spills in the vicinity of the water system. Contractor shall work with a State-Certified laboratory and request notification within 24 hours whenever: A) the presence of total coliforms, fecal coliforms or E. coli is present in a sample, B) if sample is invalidated, and C) whenever the level of nitrate in a single sample exceeds the MCL. Contractor shall ensure that a contact person is available to receive the analytical results 24-hours a day. Contractor shall require the laboratory to immediately notify NCEH and of any positive bacteriological results if the laboratory cannot make direct contact with the Contractor within 24 hours. Contractor shall maintain an operational logbook. The operational logbook shall be updated at minimum once per week and maintained at the treatment plant site. Contractor shall record all maintenance associated with the arsenic adsorption system (CA28-00039). Finished arsenic samples shall be collected monthly during normal operations, weekly if arsenic is detected, and daily if arsenic exceeds 9 ug/L. Results of this sampling shall be submitted electronically. Contractor shall notify NCEH within 48 hours if arsenic exceeds 9 ug/L. Adsorptive Media will be replaced, transported, and disposed of in a manner consistent with all applicable laws, regulations, and/or manufacturer requirements. New arsenic adsorptive media shall be disinfected in accordance with American Water Works Association (AWWA) specifications and the manufacture's recommendations. Contractor shall monitor chemical feed including checking and adjusting chlorination feed equipment and measuring free chlorine residuals by DPD method (CA28-00035) Chemical feed dosages shall be calculated weekly in units of milligrams per liter, or whenever a change in dosage is performed. (CA28-00035) Contractor shall monitor disinfection byproduct in accordance with Chapter 15.5, Title 22, of the CCR. In the event current UV disinfection system is unable to adequately disinfect the water, as documented by the presence of coliform, Contractor shall install an alternative method of disinfection approved by NCEH. The current UV disinfection system, supplied with a site glass or an intensity meter, is approved only on a conditional basis. The UV system must have an automatic shut off switch to stop the flow of water when the light goes out or the intensity drops below the required level. (CA28-00039 & CA28-00040). The UV light must be changed on an annual basis, at minimum, by the Contractor and an extra bulb must be kept on site. The system must be maintained per the manufacturer's recommendations.
