40 CFR 69.41 - New exemptions.
(a) Pursuant to section 325(a) of the Clean Air Act and a petition submitted by the Governor of the Virgin Islands, an exemption to section 123 of the Clean Air Act is granted to the Hess Oil Virgin Islands Corporation (HOVIC) at the St. Croix refinery. Specifically, the exemption waives the prohibition on the implementation of an Intermittent Control Strategy (ICS) based upon atmospheric conditions in order to set emission limitations. The emission limitations shall depend upon the sulfur content in the residual oil burned at the refinery.
(b) The protocol to be followed for the ICS shall be set forth in a Prevention of Significant Deterioration of Air Quality (PSD) permit issued to HOVIC; and shall include as a minimum, the conditions listed in paragraphs (b)(1), (b)(2), (b)(3), and (b)(4) of this section.
(1) HOVIC shall maintain a meteorological tower on its property for the purpose of the ICS which meets the required EPA QA/QC operating specifications. At a minimum, the wind direction data will be monitored, collected and reported as 1-hour averages, starting on the hour. If the average wind direction for a given hour is from within the designated sector, the wind will be deemed to have flowed from within the sector for that hour. Each “day” or “block period”, for these purposes will start at midnight and end the following midnight.
(2) HOVIC shall maintain SO2 ambient monitors and collect ambient SO2 concentration data for the purpose of implementing the ICS at nearby locations approved by EPA and specified in the PSD permit. The ambient monitors must follow the required EPA QA/QC operating specifications. At a minimum, the data will be collected according to EPA approved State and Local Ambient Monitoring Stations procedures found at 40 CFR 58.20, but will, for these purposes, be averaged by the hour, starting on the hour.
(3) The switch to a lower sulfur fuel (0.5%) will take place when paragraphs (b)(3)(i) or (b)(3)(ii) of this section are met.
(i) The winds blow from a 45 degree sector defined as 143 to 187 degrees inclusive, where zero degrees is due north, for at least 6 consecutive hours during a 24-hour block period or any 12 non-consecutive hours during a 24 hour block period.
(ii) One of HOVIC's ICS monitors measures an average ambient SO2 concentration that is 75% of the 24-hour NAAQS during any rolling 24-hour average. (75% of the 24-hour NAAQS = 274 ug/m3 or 0.105 ppm).
(4) The switch back to the higher sulfur fuel (1.0%) may occur if the conditions in paragraphs (b)(4)(i), (b)(4)(ii), and (b)(4)(iii) of this section are met.
(i) If the ICS was triggered by paragraph (b)(3)(i) of this section, the switch back may occur when the winds blow outside the sector listed in paragraph (b)(3)(i) of this section for at least 3 consecutive hours following the period during which the winds were blowing inside the sector.
(ii) If the ICS was triggered by paragraph (b)(3)(ii) of this section, the switch back may occur after all of HOVIC's ICS ambient monitors measure a 24-hour average concentration which is less than 75% of the NAAQS for at least one 24-hour block period following any occurrence when the monitor measured the concentration which was 75% of the NAAQS.
(iii) If the ICS was triggered by both paragraphs (b)(3)(i) and (b)(3)(ii) of this section, the switch back may occur when both of the conditions in paragraphs (b)(4)(i) and (b)(4)(ii) of this section are met.
(c) The protocol may be modified by EPA to protect against exceedances of the sulfur dioxide NAAQS.
(d) In the event that there is an exceedance of the NAAQS, HOVIC will report the exceedance to EPA and recommend corrective action as well as amendments to the protocol to ensure the protection of the NAAQS.
(e) HOVIC must comply with all fuel switching requirements, contained in HOVIC's PSD permit.
(f) This exemption shall take effect only in the event that a final PSD permit modification becomes effective.
(g) The Administrator may terminate the exemption through rulemaking procedures upon determining that HOVIC's use of the ICS is causing or contributing to an exceedance of the NAAQS.
(h) Pursuant to section 325(a) of the Clean Air Act (CAA) and a petition submitted by the Governor of United States Virgin Islands on July 21, 2003, (“2003 Petition”), the Administrator of EPA conditionally exempts Virgin Islands Water and Power Authority (“VIWAPA”) from certain CAA requirements.
(1) A waiver of the requirement to obtain a PSD permit prior to construction is granted for the electric generating unit identified in the 2003 Petition as Unit 23, St. Krum Bay plant in St. Thomas with the following condition:
(i) Unit 23 shall not operate until a final PSD permit is received by VIWAPA for this unit;
(ii) Unit 23 shall not operate until it complies with all requirements of its PSD permit, including, if necessary, retrofitting with BACT;
(iii) If Unit 23 operates either prior to the issuance of a final PSD permit or without BACT equipment, Unit 23 shall be deemed in violation of this waiver and the CAA beginning on the date of commencement of construction of the unit.