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Full Time - limited from greater than 200 hrs/yr to full time operation (8,760 hrs/year) <br />❑ Category 1 - Engines equipped with an external control device <br />® Category 2 - Engines with no external control device, but have a horsepower rating >_ 1,000 bhp and <br />are permitted to operate > 2,000 hours per year <br />Category 1/Category 2 engines must have either a Continuous Emissions Monitoring System (CEMS) or one of <br />the following alternate emissions monitoring plans <br />❑ CENTS, please specify all pollutants monitored: ❑ NOx ❑ CO ❑ OZ ❑ Other: <br />® Monitoring of NOx, CO, and 02 concentrations <br />❑ Monitoring of catalyst inlet and outlet temp., ammonia injection rate, and NOx, CO, and 02 concentrations <br />❑ Other Alternate Monitoring Plan (approved on a case by case basis), attach details <br />❑ Category 3 - Engines not covered by Categories 1 or 2 above <br />Category 3 engines must monitor operational characteristics recommended by the engine manufacturer or <br />emission control system supplier <br />i❑ <br />❑ Monitoring of exhaust 02 concentrations (used for lean -burn engines only) <br />Monitoring other operational characteristic (approved on a case by case basis), attach details <br />