Recycled Municipal Wastewater Contribution (RWC) Requirements.

22 CCR 60320.216

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22 CCR 60320.216

§ 60320.216. Recycled Municipal Wastewater Contribution (RWC) Requirements.

(a)

Each month, for each subsurface application GRRP used for replenishing a groundwater basin, the GRRP's project sponsor shall calculate the running monthly average (RMA) RWC based on the total volume of the recycled municipal wastewater and credited diluent water for the preceding 120 months. For GRRPs in operation less than 120 months, calculation of the RMA RWC shall commence after 30 months of recycled municipal wastewater application, based on the total volume of the recycled municipal wastewater and credited diluent water introduced during the preceding months.

(b)

The GRRP's RMA RWC, as determined in subsection (a), shall not exceed the maximum RWC specified for the GRRP by the Department.

(c)

The initial maximum RWC, which may be up to 1.0, will be based on, but not limited to, the Department's review of the engineering report, information obtained as a result of the public hearing(s), and a project sponsor's demonstration that the treatment processes will reliably achieve TOC concentrations no greater than 0.5 mg/L.

(d)

A GRRP may increase its maximum RWC, provided:

(1)

the increase has been approved by the Department and Regional Board;

(2)

for the previous 52 weeks the TOC 20-week running average, as monitored pursuant to section 60320.218, has not exceeded 0.5 mg/L; and

(3)

the GRRP has received a permit from the Regional Board that allows operation of the GRRP at the increased maximum RWC.

(e)

If the RMA RWC exceeds its maximum RWC, the GRRP's project sponsor shall:

(1)

notify the Department and Regional Board in writing within seven days of knowledge of the exceedance; and

(2)

within 60 days of knowledge of the exceedance, implement corrective action(s) and additional actions that may be required by the Department or Regional Board, and submit a report to the Department and Regional Board describing the reason(s) for the exceedance and the corrective action(s) taken to avoid future exceedances.

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