1. (a) Required samples and measurements shall be taken of the effluent from the sampling point described in the permit. Should the permit not specify a sampling point, samples shall be collected immediately following the last treatment unit. These procedures shall be followed unless an alternative sampling and/or measuring point is approved in advance in writing by the executive director or his designee.
2. (b) Samples shall be taken and measurements shall be made at the minimum frequencies specified in the permit for each parameter. If a permit does not specify a sampling frequency, the permittee shall follow the frequencies set forth in Tables 1 and 2 in §319.9 of this title (relating to Self-Monitoring and Quality Assurance Schedules), basing the frequency of analysis on the currently applicable permitted average daily flow. Table 1 shall be applicable to treated domestic sewage effluent, while Table 2 shall be applicable to all other wastewater effluents. If a parameter included in a permit is not listed in the applicable table, the permittee will be instructed by the executive director in writing as to what frequency of analysis shall be followed.
3. (c) The permit may specify different sampling and/or measurement frequencies than specified in Table 1 or Table 2 of §319.9 of this title (relating to Self-Monitoring and Quality Assurance Schedules) on a case-by-case basis, and in such cases the permit controls.
4. (d) For land disposal or evaporation facilities, the monitoring requirements shall be specified in the permit. The permittee shall monitor flow to a land treatment site on a daily basis and an evaporation system on a weekly basis when utilized. The specific plot or site used for land treatment shall be specified in the permit by name or description.
5. (e) The monitoring requirements set out in this subchapter are minimum requirements unless the permit specifies a lesser frequency. Additional measurements, samples, analyses, and recordation are encouraged in order to facilitate more effective management and control of facility operations. If the permittee monitors any pollutant at the location(s) designated herein more frequently than required by this permit using approved analytical methods as specified in §319.11 of this title (relating to Sampling and Laboratory Testing Methods), at a minimum, the results of such monitoring that indicate permit noncompliance shall be included in the calculation and reporting of the value submitted on the required monthly effluent report. The permittee may report results of such monitoring that indicate permit compliance. Increased frequency of sampling shall be indicated on the report.
6. (f) Calculations for all limitations which require averaging of measurements shall utilize an arithmetic mean unless otherwise specified in the permit.

Source Note:The provisions of this §319.5 adopted to be effective July 27, 1988, 13 TexReg 3514; amended to be effective October 8, 1990, 15 TexReg 5501.