Section 096-170-7 - Monitoring RequirementsThe following monitoring requirements apply during a degassing event of any petroleum storage tank, marine vessel cargo tank, or transport vessel subject to this Chapter. Monitoring at least once every 15 minutes is required to demonstrate compliance with the continuous monitoring requirements in this subsection.
A. Any monitoring device used to comply with this subsection must be calibrated, maintained, and operated according to the manufacturer's instructions.B. To demonstrate compliance with Section 4(A)(2) of this Chapter, the owner or operator shall monitor the VOC concentration in the line between the tank or vessel being degassed and the control device at least four times per hour, once during each 15-minute interval.C. The owner or operator shall monitor and record any operational parameters necessary to demonstrate the proper functioning of the vapor control system used to comply with this Chapter at all times when the system is in use. (1) For a carbon adsorption system, the owner or operator shall continuously monitor and record the exhaust gas VOC concentration to detect any breakthrough. For the purpose of this Chapter, breakthrough is defined as a measured exhaust gas VOC concentration exceeding 100 ppmv above background, expressed as methane.(2) For a catalytic incinerator or regenerative thermal oxidizer, the owner or operator shall continuously monitor the inlet and outlet gas temperature.(3) For a thermal oxidizer or flare, the owner or operator shall continuously monitor for presence of flame.(4) Alternative monitoring methods may be allowed upon written approval by the Department.(5) The owner or operator shall contact the Department at least 30 days prior to using a vapor control system not listed above and submit for the Department's approval a site-specific monitoring plan for the proposed vapor control system.06-096 C.M.R. ch. 170, § 7