Carter Carburetor Weekly Air Monitoring & Sampling Report April 11, 2016 - April 17, 2016 Carter Carburetor Daily Weather Conditions Monday 4/11/2016 Tuesday 4/12/2016 Wednesday 4/13/2016 Thursday 4/14/2016 Friday 4/15/2016 Saturday 4/16/2016 Sunday 4/17/2016 Temperature (range)1 59-43 58-37 65-40 71-43 78-54 78-53 82-55 Wind Speed (peak & average)2 23.9/8.1 17.0/5.1 19.9/6.9 19.9/6.7 25.9/9.8 30.0/9.6 23.9/7.8 Wind Direction (predominant) NW NE S E SE SE SE Precipitation (total)3 0.99 0.00 0.00 0.00 0.00 0.00 0.00 Carter Carburetor Daily Work Activities Site Activity Monday 4/11/2016 Tuesday 4/12/2016 Wednesday 4/13/2016 Thursday 4/14/2016 Friday 4/15/2016 Saturday 4/16/2016 Sunday 4/17/2016 Backfill of Die Cast excavation area X Dewatering of excavation area X X Die Cast area excavation footprint inspected and approved for backfill X Die Cast area material hauled off site X X Excavation of Die Cast area X X TCE area characterization (drilling and developing wells) X X X X X Daily Air Monitoring and Sampling Results Air Monitoring / Sampling Results - Station 1 LINC127 Results reported in |ig/m3) Parameter Type of Analysis Standard / Action Level Monday 4/11/2016 Tuesday 4/12/2016 Wednesday 4/13/2016 Thursday 4/14/2016 Friday 4/15/2016 Saturday 4/16/2016 Sunday 4/17/2016 PMio (24-hour TWA) Real- time 150 ng/m3 (NAAQS) 20.2 15.8 21.3 16.5 23.1 18.6 17.3 Aroclor -1242 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) 0.0264 Aroclor -1248 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1254 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1260 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Comments Laboratory sample collected Thursday, 4/14/2016. IIII || 1 II 1 II 111 llll II 30285576 ------- Carter Carburetor Weekly Air Monitoring & Sampling Report April 11, 2016 - April 17, 2016 Air Monitoring / Sampling Results - Station 2 LINC126 Results reported in |ig/m3) Parameter Type of Analysis Standard / Action Level Monday 4/11/2016 Tuesday 4/12/2016 Wednesday 4/13/2016 Thursday 4/14/2016 Friday 4/15/2016 Saturday 4/16/2016 Sunday 4/17/2016 PMio (24-hour TWA) Real- time 150 ng/m3 (NAAQS) 15.0 11.4 16.0 12.4 16.0 13.7 12.3 Aroclor -1242 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) 0.327 Aroclor -1248 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1254 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1260 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Comments Laboratory sample collected Thursday, 4/14/2016. Air Monitoring / Sampling Results - Station 3 LINC 123 Results reported in |ig/m3) Parameter Type of Analysis Standard / Action Level Monday 4/11/2016 Tuesday 4/12/2016 Wednesday 4/13/2016 Thursday 4/14/2016 Friday 4/15/2016 Saturday 4/16/2016 Sunday 4/17/2016 PMio (24-hour TWA) Real- time 150 ng/m3 (NAAQS) 22.1 18.0 23.6 19.3 21.3 18.7 16.4 Aroclor -1242 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) 0.0582 Aroclor -1248 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1254 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1260 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Comments Laboratory sample collected Thursday, 4/14/2016. ------- Carter Carburetor Weekly Air Monitoring & Sampling Report April 11, 2016 - April 17, 2016 Air Monitoring / Sampling Results - Station 4 LINC128 Results reported in |ig/m3) Parameter Type of Analysis Standard / Action Level Monday 4/11/2016 Tuesday 4/12/2016 Wednesday 4/13/2016 Thursday 4/14/2016 Friday 4/15/2016 Saturday 4/16/2016 Sunday 4/17/2016 PMio (24-hour TWA) Real- time 150 ng/m3 (NAAQS) 9.5 6.4 11.0 7.3 Aroclor -1242 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) 0.0686 Aroclor -1248 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1254 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1260 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Comments Laboratory sample collected Thursday, 4/14/2016. Real-time air monitoring equipment malfunctions caused intermitted data transmissions Friday, 4/15/2016, through Sunday, 4/17/2016. Air Monitoring / Sampling Results - Station 5 LINC 133 Results reported in |ig/m3) Parameter Type of Analysis Standard / Action Level Monday 4/11/2016 Tuesday 4/12/2016 Wednesday 4/13/2016 Thursday 4/14/2016 Friday 4/15/2016 Saturday 4/16/2016 Sunday 4/17/2016 PMio (24-hour TWA) Real- time 150 ng/m3 (NAAQS) 33.7 29.7 36.1 30.1 32.9 31.7 29.5 Aroclor -1242 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) 0.0643 Aroclor -1248 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1254 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Aroclor -1260 (in air sample) Lab 30.7 Hg/m3 (EPA Region 7) ND Comments Laboratory sample collected Thursday, 4/14/2016. Legend: No shading - indicates TWA readings less than the applicable standard/action level Yellow shading - indicates a 1-hour TWA exceeded the applicable standard/action level, but the 24-hour TWA was below the standard/action level; initiate investigation Red shading - indicates the 24-hour TWA exceeded the applicable standard/action level; initiate corrective action Blue shading - indicates no data are available Aroclor - Monsanto mixture of polychlorinated biphenyl (PCB) congeners NAAQS - National Ambient Air Quality Standard ND - Not detected PCB-Polychlorinated biphenyl PMio - Particulate matter less than 10 microns in size TCE -Trichloroethene TWA - Time-weighted average (average of data collected from 12:00 AM to 12:00 AM) Hg/m3 - Micrograms per cubic meter temperature reported in degrees Fahrenheit 2 Wind speed reported in miles per hour 3 Precipitation reported in inches ------- Carter Carburetor Weekly Air Monitoring & Sampling Report April 11, 2016 - April 17, 2016 St. Louis City ir Station 5 Air Station 2 Weather Station m Hi Air Station 1 Legend ® Air station location Weatherstation ^ location Missouri Station Site Locator Station o Site Boundary| ------- |