Overpasses 1 and 2 on Site 6 both detected small emissions (< 1 kg/hr). Corresponding rate estimates from the DLQ algorithm and solution C were all zero (indicating no emissions), while estimates from solution B were non-zero but still small. While the number of overpasses in the small emission rate regime is limited, these two instances provide some evidence that CMS are able to identify periods of small or no emissions.