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® COLORADO llEPARTMENI' OF HEALTH, Water Quality Control Division <br />Rationale - Page 7. Permit No. CO-0032630 <br />Footnotes: <br />a/ This limitation shall apply at all times. <br />b/ This limitation shall apply to discharges during periods of no <br />precipitation and m~ apply to discharges during periods of <br />precipitation. (Subject to burden of proof requirements). <br />c/ This limitation m~ apply to discharges during periods of precipitation <br />less than or equal to the 10-year, 24-hour event for this facility. <br />(Subject to burden of proof requirements). <br />d/ In compliance with the "Regulations for Implementation of the Colorado <br />River Salinity Standards Through the NPDES Permit Program", the permittee <br />shall sample for salinity in tt~e wastewater effluent on a monthly basis <br />until six samples have been analyzed. Thereafter, monitoring shall <br />continue on a quarterly basis. The Division will review the first six <br />months of data and determine if a waiver of numeric limitations can be <br />granted based on the salt-load to the river being less than one ton/day <br />(or 350 tons/year). If a waiver is not granted, the permittee has an <br />additional six months to submit a report in accordance with the Salinity <br />Regulations, addressing economic feasability of salt-removal. <br />DISCUSSION: <br />1. Winter MonitarinR Exemption <br />T'he permittee has indicated that during the winter periods (roughly from <br />November 1 to March 15) outfall If003 is inaccessible due to heavy snow. <br />1'he permittee will not be required to monitor II003 during the "winter <br />freeze" periods if inaccessible. The permittee will be reyuired to <br />indicate on or as an~attachment to. the applicable discharge monitoring <br />report (DMR) the specific dates during which the site is inaccessible. <br />During the remainder of the year, the permittee will be required to <br />monitor at the freyuencies specified in the permit. This is a <br />continuation of the exemption first granted in 1903. <br /> <br />