Res 2005-105 - Laserfiche WebLink

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City of San Marcos TPDES Permit No. WQOOI0273002 Copies of the TRE Activities Report shall also be submitted to the U.S. EPA Region 6 office. e. During the TRE, the permittee shall perform, at a minimum, quarterly testing using the mOTe sensitive species; testing for the less sensitive species shall continue at the frequency specified in Part 1.b. f. If the effluent ceases to effect significant lethality (herein as defined below) the permittee may end the TRE. A "cessation oflethality" is defined as no significant lethality for a period of 12 consecutive months with at least monthly testing. At the end of the 12 months, the permittee shall submit a statement of intent to cease the TRE and may then resume the testing frequency specified in Part l.b. The permittee may only apply the "cessation oflethality" provision once. This provision accommodate situations where operational errors and upsets, spills, or sampling errors triggered the TRE, in contrast to a situation wherc a single toxicant or group of toxicants cause lethality. This provision does not apply as a result of corrective actions taken by the permittee. "Corrective actions" aTe herein defined as proactive efforts which eliminate or reduce effluent toxicity. These include, but are not limited to, source reduction or elimination, improved housekeeping, changes in chemical usage, and modifications of influent streams and/or effluent treatment. The permittee may only apply this cessation of lethality provision once. If the efflucnt again demonstrates significant lethality to the same species, the permit will be amended to add a WET limit with a compliance period, if appropriate. However, prior to the effective date of the WET limit, the permittee may apply for a permit amendment removing and replacing the WET limit with an alternate toxicity control measure by identifying and confmning the toxicant and/or an appropriate control measure. g. The permittce shall complete the TRE and submit a Final Report on the TRE Activities no later than 28 months from the last test day ofthe retest that confirmed significant lethal effects at the critical dilution. The permittee may petition the Executiye Director (in writing) for an extension of the 28-month limit. However, to warrant an extension the permittee must have demonstrated due diligence in their pursuit of the TIErrRE and must prove that circumstances beyond their control stalled the TIEfTRE. The report shall pTOvide information pertaining to the specific control mechanism(s) selectcd that will, when implemented, result in reduction of effluent toxicity to no significant lethality at the critical dilution. The report will also provide a specific corrective action schedule for implementing the selected control mechanism( s). A copy of the TRE Final Report shall also be submitted to the U.S. EPA Region 6 office. h. Based upon the results of the TRE and proposed corrective actions, this permit may be amended to modifY the biomonitoring requirements, where necessary, to require a compliance schedule for implementation of corrective actions, to specifY a WET limit, to specifY a BMP, and/o:r to specifY CS limits. Page 31