Appendix Gs Air Quality and Greenhouse Gas ... - Peabody Energy

5.4 DiscussionIt is noted that the annual concentration and deposition limits are predicted to be generally met atsensitive locations. Therefore the long term impact of the proposed mine may be considered to beacceptable.Short term (24 hour) PM10 concentrations are predicted to exceed the PM10 criterion. This meansthat while for most days of the year the impacts are acceptable, from time to time 24 hourconcentrations are predicted to be exceeded. These would predominantly be associated withspecific weather conditions, such as being downwind of the mine on a winter’s night, when thedispersive capacity of the atmosphere is limited.To minimise dust impacts at sensitive receivers, the options are as follows: Apply additional dust mitigation measures to the mining operations. Dust mitigationmeasures are discussed further in Section 6. Relocate dwellings at receivers 3, 4, 5, 7 & 8 further away from the mine footprint such thatthe resulting dust levels are compliant.Once the mine is operational the following steps should be undertaken: 24hr average PM10 dust monitoring is to be undertaken at sensitive receivers 3, 4, 5, 7 and8, unless otherwise relocated, or any other receiver from where a non-vexatious dustcomplaint is received. Results from this monitoring should be compared against the dustlimits in the Environmental Authority. Care should be taken to ensure that measurementlevels are representative of dust from the Codrilla mining operations, and are not fromregional or localized events (e.g. dust storm, bushfire, non mining vehicles on dirt roads, etc).Measurement results should be reported in conjunction with weather data.Given the range of potential meteorological conditions and therefore the range in predicteddust levels, it is likely that several monitoring periods would be required to establishcompliance or exceedance. This is generally the case with environmental dust, as the dusttransportation variations can be significant occurring over long periods of time (e.g. seasonalvariations). Thus any dust monitoring to determine compliance or otherwise should beconducted over a minimum 7 day period and may be required to be conducted overseveral seasons. Should dust levels indicate exceedances then a mitigation strategy should be developed,using the guidance provided in Section 6.Codrilla Coal Mine Project - Air Quality & Greenhouse Gas Assessment - Addendum Report 5843R02V01_draft2Valkyrie Page 19 of 51