Wambo Coal AEMR 2010-2011 - Peabody Energy

aemcWambo Coal Mine, Rail Loop and Coal LoaderIndependent Environmental Audit – Minister’s Condition of ApprovalBLASTING & VIBRATION - Airblast Overpressure Limits4/11 The Applicant shall ensure that the airblast overpressure level fromblasting at the development does not exceed the criteria in Table 12at any residence on privately-owned land with the exception ofproperty 13C (Skinner) (see condition 20 below).Airblast overpressurelevel (dB(Lin Peak))115Allowable exceedance5% of the total number of blasts overa period of 12 months120 0%Table 12: Airblast overpressure impact assessment criteria Blast Monitoring Program,Rev 2, Dec 2008 Blast Monitoring Results 1Nov 2005 to 31 Oct 2006 Letter from DEC re blastOverpressure, 13 Jun 2006 Environmental IncidentReport re Blast OverpressureExceedance at Kellymonitoring site, 13 Oct 2008 Environmental IncidentReport Blast OverpressureExceedance at the Harrismonitoring site, 14 Aug 2009 Letter from DECCW rePenalty Infringement Noticere Blast OverpressureExceedance, 4 Mar 2011YesYesNOBlast monitoring is conducted in accordance with the BlastMonitoring Program revision 2 December 2008.All blast monitoring results demonstrated compliance with the115 dBL criteria on all occasions.The blast monitoring identified the following exceedances of the>120dBL criteria:2007-2008: 4 of 109 blasts exceeded 115dBL (i.e. 3.6%)therefore compliant. No blasts exceeded 120dBL.2008-2009: 2 of 102 blasts exceeded 115 dBL (i.e. 2%) thereforecompliant. One blast exceeded 120dBL (120.3dBL at Kellymonitoring site on 13 October 2008) was reported to DECC.2009-2010: 2 of 62 blasts exceeded 115dBL (i.e. 5%) thereforecompliant. One blast exceeded 120dBL criteria (122.1dBL atHarris monitoring site 14 August 2009) was reported to DECCW.2010-June 2011: One blast exceeded120dBL (i.e.124.2dBL atMuller monitoring site on 17 February 2011) was reported toDECCW. Wambo Coal was issued with a Penalty InfringementNotice in relation to this exceedance on 4 March 2011.Ground Vibration Impact Assessment Criteria4/12 The Applicant shall ensure that the ground vibration level fromblasting at the development does not exceed the criteria in Table 13at any residence on privately-owned land with the exception ofproperty 13C (Skinner) (see condition 20 below). AEMR 2005-2006 Blast Monitoring Results 1Nov 2005 to 31 Oct 2006YesNo vibration results have been recorded that exceed the5mm/sec peak particle velocity criteria, during the 2006-June2011 period.Peak particle velocity(mm/s)Allowable exceedance55% of the total number of blasts overa period of 12 months10 0%Table 13: Ground vibration impact assessment criteriaBlasting Hours4/13 The Applicant shall only carry out blasting at the developmentbetween 9 am and 5 pm Monday to Saturday inclusive. No blastingis allowed on Sundays, public holidays or any other time without thewritten approval of DECCW. Blast Monitoring Results 1Nov 2005 to 31 Oct 2006YesNo blasts have occurred outside the allowable hours of 0900 to1700 hours during the 2006-June 2011 period.trevor brown & associates 49applied environmental management consultants