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Table G-1. Daily Average Dust (PM10) Concentrations, Visual Observations, and Dust Control Measures EmployedProject No. 110207, Everett, WashingtonDate General Site Earthwork ActivitiesMonitoring Duration (Hour:Min)Daily Average PM10 Conc. (mg/m3)Qualitative Observations regarding Visible Dust Contractor Dust Control Measures EmployedQuantitative Measurements10/12/20Excavation in BBH and BAMW7 areas. CM removal in Area I. Backfill in completed eastern and central areas.Visible dust not apparent at fenceline.Water truck operated periodically as needed.10/13/20Excavation in BBH area. CM removal in Area I. Backfill in completed eastern and central areas.Visible dust not apparent at fenceline.Same as above.10/14/20Excavation in BBH and GFB12 areas. CM removal in Area I. Backfill in completed eastern and central areas.Visible dust not apparent at fenceline.Same as above.10/15/20Excavation in BBH and GFB12 areas. CM removal in Areas I, J. Backfill in completed eastern and central areas.7:050.011Visible dust not apparent at fenceline.Same as above.10/16/20Excavation in BBH area. CM removal in Areas I, J, O. Backfill in completed eastern and central areas.7:050.009Visible dust not apparent at fenceline.Same as above.10/19/20CM removal in Area J. Backfill in completed eastern and central areas.Visible dust not apparent at fenceline.Water truck operated periodically as needed.10/20/20Excavation in BBH and GFB12 areas. CM removal in Area J. Backfill in completed eastern and central areas.Visible dust not apparent at fenceline.Same as above.10/21/20Excavation in BBH and GFB12 areas. CM removal in Areas J, O. Backfill in completed eastern and central areas.Visible dust not apparent at fenceline.Same as above.10/22/20Excavation in BBH area. CM removal in Areas J, O. Backfill in completed eastern and central areas.Visible dust not apparent at fenceline.Same as above.10/23/20CM removal in Areas J, O. Backfill in completed eastern and central areas.Visible dust not apparent at fenceline.Same as above.Notes:*: Meter malfunctioned, generating negative readings.Rain - no monitoringRain - no monitoringRain - no monitoring^: High humidity and esp. fog can cause high bias in the dust monitor's readings. This is due to water-uptake and resulting hygroscopic growth of the aerosol particles, causing them to scatter more light and generate higher apparent mass concentration readings by the photometric instrument (TSI Application Note EXPMN-008 [2014]).Rain - no monitoringRain - no monitoringRain - no monitoringRain - no monitoringRain - no monitoringAspect Consulting12/17/2020V:\110207 KC Everett Mill\Deliverables\Interim Action Report 2020\Client Review Draft\App G Dust monitoring\Table G-1 Dust Monitoring Data & ObservationsTable G-1Report for Second Interim ActionPage 4 of 4