Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 115 - CONTROL OF AIR POLLUTION FROM VOLATILE ORGANIC › Subchapter H - HIGHLY-REACTIVE VOLATILE ORGANIC COMPOUNDS › Division 2 - COOLING TOWER HEAT EXCHANGE SYSTEMS › Section 115.764 - Monitoring and Testing Requirements

Current through Reg. 49, No. 28; July 12, 2024
(a)
					 The owner or operator of a cooling tower heat exchange system with a design
					 capacity to circulate 8,000 gallons per minute (gpm) or greater of cooling
					 water shall:
(1) install, calibrate, operate,
					 and maintain a continuous flow monitor on each inlet of each cooling tower.
					 Each monitor shall be calibrated on an annual basis to within ±5.0%
					 accuracy. When the cooling tower flow monitor is down, flow measurements shall
					 be used for the most recent 24-hour period in which the flow measurements are
					 representative of cooling tower operations during monitor downtime;
(2) install, calibrate, operate, and maintain
					 a system to continuously determine the total strippable volatile organic
					 compound (VOC) concentration at each inlet of each cooling tower. The
					 continuous monitoring system must have a minimum detection limit capability of
					 no more than 25 parts per billion by weight (ppbw) of strippable VOC in the
					 cooling water. The continuous monitor must be calibrated with methane or a VOC
					 that best represents potential leakage into the cooling tower system and the
					 emissions from the system. Calibration must be checked weekly or more
					 frequently, as necessary, to maintain a monitor drift of less than 5.0%. During
					 out-of-order periods of the VOC monitor(s) of 24 hours or greater, a sample
					 must be collected for total VOC analysis according to the air-stripping method
					 in Appendix P of the Texas Commission on Environmental Quality Sampling
					 Procedures Manual (January 2003). This sample must be collected at least three
					 times per calendar week, with an interval of no less than 36 hours between
					 samples;
(3) continuously operate
					 each monitoring system as required by this section at least 95% of the time
					 when the cooling tower is operational, averaged over a calendar year. The
					 percent measurement data availability must be calculated as the total operating
					 hours of the cooling tower heat exchange system for which valid quality-assured
					 data was recorded divided by the total operating hours of the cooling tower
					 heat exchange system. Time required for normal calibration checks required
					 under this subsection is not considered downtime for purposes of this
					 calculation;
(4) determine the
					 speciated strippable highly-reactive volatile organic compound (HRVOC)
					 concentration by collecting samples from each inlet of each cooling tower at
					 least once per month in accordance with the air-stripping method in Appendix
					 P;
(5) if the concentration of
					 total strippable VOC is equal to or greater than 50 ppbw in the cooling tower
					 water for more than a one-hour block of time, collect an additional sample to
					 determine speciated and total HRVOC in accordance with the air-stripping method
					 in Appendix P from each inlet of the affected cooling tower at least once
					 daily, beginning on the next calendar day. The additional sampling to determine
					 speciated and total HRVOC shall continue on a daily basis until the
					 concentration of total strippable VOC drops below 50 ppbw; and
(6) in lieu of the monitoring in paragraph
					 (2) of this subsection and the sampling for speciation of strippable HRVOC in
					 paragraphs (4) and (5) of this subsection, a continuous on-line monitor capable
					 of providing total HRVOC and speciated HRVOCs in ppbw may be installed. The
					 sampling system for the continuous on-line monitoring system must be
					 demonstrated equivalent to the air-stripping apparatus used in Appendix P for
					 determining strippable HRVOC concentrations in the water as specified in
					 subsection (f) of this section. The continuous on-line monitor system must
					 satisfy the requirements of Sections 8.3, 10, 13.1, and 13.2 of 40 Code of
					 Federal Regulations (CFR) Part 60, Appendix B, Performance Specification 9, as
					 amended through October 17, 2000 (65 FR 61744). The multi-point calibration
					 procedure in Section 10.1 of Performance Specification 9 must be performed at
					 least once every calendar quarter instead of once every month. During
					 out-of-order periods of the on-line HRVOC monitor(s) of 24 hours or greater,
					 sampling must be performed for total and speciated HRVOC analysis according to
					 the air-stripping method in Appendix P. Sampling must be performed at least
					 three times per calendar week, with an interval of no less than 36 hours
					 between sampling times, until the continuous on-line monitor is properly
					 operating and within the required performance specifications.
(A) During out-of-order periods of the
					 monitoring system, data should be handled as follows for purposes of
					 recordkeeping and demonstrating compliance:
(i) For each out-of-order period less than 24
					 hours, the maximum one-hour average HRVOC concentrations from the 24-hour
					 period immediately prior to the out-of-order period must be used; and
(ii) For each out-of-order period of 24 hours
					 or greater, the maximum one-hour average HRVOC concentrations from the 24-hour
					 period immediately prior to the out-of-order period must be used for the time
					 period from the initial outage of the monitoring system to time of collection
					 of the first manual sample required by this paragraph. The results of each
					 manual sample must be used for the time period from collection of that sample
					 to the collection of the subsequent sample, or to the time that the continuous
					 monitoring system is on-line and within the required performance
					 specifications.
(B) For
					 periods that only the analyzer system is out of order and the sampling system
					 (i.e., HRVOC sparging or stripping system) is still functioning within normal
					 specifications, the owner or operator may elect to collect the manual samples
					 required by this paragraph using the sampling system of the continuous HRVOC
					 monitoring system.