Section C102 Wastewater Recycling Systems

This section shall apply to water recycling systems collecting wastewater and rainwater. Treated effluent must comply with the water quality standards listed in Table C102.1 and may be used for flushing of water closets and urinals, cooling tower makeup, washing of sidewalks, streets or buildings, laundry, subsurface or drip landscape irrigation systems, watering plants with a hose or other approved uses that are located in the same lot as the water recycling system.

Exception: Systems collecting only rainwater and/or condensate used solely for cooling tower makeup and/or subsurface and drip irrigation shall comply with Section PC C103.

TABLE C102.1 MINIMUM WATER QUALITY STANDARDS

POLLUTANT	QUANTITY LIMIT
BOD	< 10 mg/la
TSS	< 10 mg/l
Total Coliform	< 100 per 100 ml
E. Coli	< 2.2 colonies per 100 ml
pH	6.5—8.0
Turbidity	< 2.0 NTUb

a. Effluent from rainwater and condensate collected in separate tanks or compartments from wastewater shall not be required to meet the BOD limitations indicated above.

b. The wastewater facility effluent must meet the performance standards of < 2.0 NTU for turbidity for 95% of the measurements. At no time can the turbidity result be above 5 NTU. These results shall be recorded and compiled in the annual report.

Filtered effluent shall be disinfected prior to reuse by an acceptable method, which shall achieve the minimum water quality standards as stated in Table C102.1.

Potable water shall be supplied as a source of makeup water for water recycling systems included in Section PC C102. The potable water supply shall be protected against backflow in accordance with Section PC 608.

If the treated effluent water is to be dyed, the dye shall be a food grade vegetable dye either blue or green in color. Such effluent water shall be dyed before being supplied to the fixtures.

Drain, waste and vent piping for water recycling systems shall be tested in accordance with Section PC312. Distribution piping for water recycling systems shall be tested in accordance with Section 312.5 of this code. Additional tests shall be performed in accordance with Sections C102.8.1 through C102.8.3.

The system shall be "wet tested" with potable water to ensure no leaks exist and all equipment is fully functional.

After successful wet testing and once sufficient influent is established for continuous operation, the system shall be placed into start-up mode for a minimum of two weeks. Adequate flow shall be based on design requirements and nutrient loads. Samples shall be collected five days per week and each sample must meet the water quality requirements of Table C102.1. Samples not meeting the water quality requirements of Table C102.1 shall be recorded, and included in the final start-up test report. Successful start-up tests shall demonstrate 100 percent compliance with the water quality requirements of Table C102.1 for a period of two continuous weeks. Treated water effluent from the recycling system shall be directed to a floor drain. The building shall continue to operate all fixtures using only the potable water system during this start-up testing.

The system shall be placed into temporary use mode after successful start-up testing. During the temporary use mode, treated effluent from the system shall be directed into the recycled water reservoirs and shall be utilized in accordance with Section C102.1. Samples shall be collected on a weekly basis for a period of three months. The operation of the system shall immediately cease if any test sample does not meet the minimum water quality standards of Table C102.1 in which case, tests from at least five consecutive days shall demonstrate full compliance.