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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 Employed0.0290.00805/20/20Breach Pipe C; constructed settling basin on pavement for vactor materials6:20 0.00505/21/20Video/vactor pipes C and M. Remove unusable wood chips 6:50 0.00405/22/20Remove unusable wood chips2:40 0.00505/26/20Pipe K excavation; Remove unusable wood chips7:40 0.00105/27/20Pipe K excavation; Pipe C plug w/ CDF7:05 0.00205/28/20Hydraulic Barker area scrape/stockpile CM, start soil excavation. Wood chip removal.7:35 0.01005/29/20Hydraulic Barker area soil excavation8:00 0.01006/01/20Removal of Pipe M inland of plugged vault.7:40 0.00306/02/20Expose, breach, plug Pipe K at shoreline6:00 0.00806/03/20Removed inland portion of Pipe M. Potholed to find inland portion of Pipe K.7:45 0.00506/04/20Pipe K plugging. Backfill Pipe M vault. Hydraulic Barker overexcavation.7:10 0.00206/05/20Cut concrete to expose wooden Pipe F @ shoreline. Pipe M pipe removal, backfill.7:10 0.00706/08/20Breached Pipe F @ 15' and 75', video pipe. Hydraulic Barker overexcavation.06/09/20Begin filling Pipe F with CDF.06/10/20Complete CDF placement inside and around Pipe F @15' and 75' breaches.8:00 0.00306/11/20CM potholing.6:00 0.00806/12/20(half-day rain) CM removal from PM-B-6 area. CM potholing.4:20 0.00806/15/20PM-B-6 CM scraping/stockpiling and soil excavation.06/16/20PM-B-6 soil excavation.6:45 0.00106/17/20Log Pond chip conveyor area CM stripping, then soil excavation.6:50 0.00206/18/20Log Pond chip conveyor area soil excav. Clark Nickerson CM & overburden stripping,8:00 0.00206/19/20Brush clearing but no earthwork.06/22/20Soil over-excavation in PMB6 and Log Pond conveyor areas.7:15 0.00206/23/20Soil excavation in Log Pond conveyor and Clark-Nickerson west areas.7:25 0.00206/24/20Soil excavation in Clark Nickerson east and soil over-excavation in PMB6 areas.8:00 0.00506/25/20Soil excavation in OMS area.8:00 0.00506/26/20Soil excavation in OMS area.7:20 0.00406/29/20Soil excavation in OMS area, soil over-excavation in LP Conveyor and CN-west areas.8:00 0.01406/30/20CM excavation/stockpiling onsite from areas A1 and B1.3:05 before rain0.00407/01/20CM removal from A1 and B1.07/02/20CM removal from A1 and B1.07/06/20Over-excavation in PMB6 and OMS areas.7:30 0.00907/07/20Soil excavation in OMS area. Backfilling Log Pond & CN excavations. CM removal A1 & B1.07/08/20CMS soil excavation. CM removal A1 & B1.7:40 0.00607/09/20CMS soil excavation. CM removal B1 & F.7:30 0.00807/10/20CMS soil excavation. CM removal B1 & F.7:20 0.00507/13/20Soil excavation in CMS area. CM removal B1 & F.7:50 0.00807/14/20Soil excavation in CMS area. CM removal F. 7:55 -0.001*07/15/20Soil over-excavation in OMS and PMB6 areas. CM removal F.7:50 0.01007/16/20Soil excavation in CMS area. CM removal F.7:35 0.01407/17/20Soil excavation in CMS area. CM removal F.7:10 0.01307/20/20Soil excavation in CMS area. CM removal F.8:00 0.009Quantitative MeasurementsAverage PM10 Concentration during Work Hours for Project Duration (mg/m3), excluding smoke and fog days =Maximum Daily Average PM10 Concentration during Work Hours (mg/m3), excluding smoke and fog days =Rain - no monitoringRain - no monitoringRain - no monitoringRain - no monitoringNo earthwork - no monitoringRain - no monitoringRain - no monitoringAir quality standard for PM10 is 0.15 mg/m3 as 24-hr average.Aspect 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 1 of 4