Res 2005-105 - Laserfiche WebLink

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City of San Marcos TPDES Permit No. WQOOl0273002 2) The permittee shall collect the 24-hour composite samples such that the samples are representative of any periodic episode of chlorination, biocide usage, or other potentially toxic substance discharged on an intermittent basis. 3) The permittee shall initiate the toxicity tests within 36 hours after collection of the last portion of the 24- hour composite sample. Samples shall be maintained at a temperature of 0-6 degrees Centigrade during collection, shipping, and storage. 4) If Outfall 001 ceases discharging during the collection of the effluent composite sample, the requirements for the minimum number of effluent portions are waived. However, the permittee must have collected a composite sample volume sufficient for completion of the required test. The abbreviated sample collection, duration, and methodology must be documented in the full report required in Part 3 of this Section. 5) The effluent samples shall not be dechlorinated after sample collection. 3. Reporting All reports, tables, plans, summaries, and related correspondence required in any Part of this Section shall be submitted to the attention ofthe Water Quality Standards Team (MC 150) of the Water Quality Division. All DMRs, including DMRs with biomonitoring data, should be sent to the Water Quality Compliance Monitoring Team of the Enforcement Division (MC 224). a. The permittee shall prepare a full report of the results of all tests conducted pursuant to this permit in accordance with the Report Preparation Section of "Methods for Measuring the Acute Toxicity ofEffiuents and Receiving Waters to Freshwater and Marine Organisms, Fifth Edition" (EPA-821-R -02-012), or the most recent update thereof, for every valid and invalid toxicity test initiated. All full reports shall be retained fOf 3 years at the plant site and shall be available for inspection by TCEQ persormel. b. A full report must be submitted with the fIrst valid biomonitoring test results for each test species and with the first test results any time the permittee subsequently employs a different test laboratory. Full reports need not be submitted for subsequent testing unless specifically requested. The permittee shall routinely report the results of each biomonitoring test on the Table 2 forms provided with this permit. All Table 2 reports must include the information specified in the Table 2 form attached to this permit. 1) Semiannual biomonitoring test results are due on or before January 20th and July 20th for biomonitoring conducted during the previous 6 month period. 2) Quarterly biomonitoring test results are due on or before January 20th, Apri120th, July 20th, and October 20th, for biomonitoring conducted during the previous calendar quarter. c. Enter the following codes on the DMR for the appropriate parameters for yalid tests only: 1) For the water flea, Parameter TIE3D, enter a "0" if the mean survival at 24-hours is greater than 50% in the 100% effluent dilution; ifthe mean surviyal is less than or equal to 50%, enter a "1." 2) For the fathead minnow, Parameter TIE6C, enter a "0" ifthe mean survival at 24-hours is greater than 50% in the 100% effluent dilution; if the mean survival is less than or equal to 50%, enter a "1." d. Enter the following codes on the DMR for retests only: 1) Fonetest number 1, Parameter 22415, enter a "0" if the mean survival at 24-hours is greater than 50% Page 37