Environmental monitoring for the 2021 construction includes water and air. Air monitoring is being performed around the secure landfill, Route 131 Staging Area, Haverstock Road Staging Area, and Alcoa East Plant dock during construction at those locations. Water monitoring is being performed in the river and at water intakes. These monitoring activities and results for the current month are summarized below. (Additional 2021 Lab Results: Current Month | April | May | June | July | August | September )

Air Monitoring - 2021 Secure Landfill Construction and Operation

Program includes particulate monitoring using real-time meters for particulates (or dust) and volatile organic compounds (VOCs) and sampling for PCB analytical testing. Corrective action levels have been established based on levels that are safe for the community for particulates, VOCs, and PCBs. The actual monitoring results are compared to the corrective action levels to determine if adjustments in construction are needed. The air monitoring locations and tabulated results are provided below.

Note that air monitoring for PCBs and VOCs was discontinued in June as material handling and disposal operations were completed. Air monitoring for dust was also discontinued in June as landfill construction and covering efforts were completed. Additional dust monitoring will be performed if final covering activities are performed this year.

Air Monitoring Locations - Secure Landfill


2021 Air Particulate Data (Corrective Action Level = 0.150 milligram per cubic meter above upwind location)

  Monitoring Station ID (see figure)  
Date Action Level Check SLF-AIR1 SLF-AIR2 SLF-AIR3 SLF-AIR4 SLF-AIR-PA SLF-AIR-PB Notes
October 5 All Below 0.0294 0.0404 0.0171 0.019 0.016 0.0179 --
October 6 All Below 0.0307 0.0394 0.0124 0.0161 0.006 0.0134 --
October 7 All Below 0.0428 0.0518 0.0161 0.0215 0.017 0.0298 --
October 8 All Below 0.06 0.0565 0.0124 0.0372 0.033 0.0229 --
October 9 All Below 0.0668 0.0753 0.0267 0.0512 0.041 0.0576 --
October 12 All Below 0.0269 0.0403 0.013 0.0005 0.01 0.0123 --
October 13 All Below 0.0466 0.0582 0.0152 0.017 0.028 0.0228 --
October 14 All Below 0.0305 0.0395 0.0182 0.135 0.02 0.0345 SLF-AIR4 levels not related to field activities
October 15 All Below 0.0214 0.032 0.0265 0.022 0.007 0.0076 --
October 16 All Below 0.0626 0.0684 0.0311 0.024 0.0341 0.0531 --
October 19 All Below 0.0183 0.0407 0.0081 0.024 0.0045 0.0058 --
October 20 All Below 0.0248 0.0443 0.0208 0.0182 0.0288 0.0111 --
October 21 All Below 0.0368 0.0513 0.0451 0.0209 0.0185 0.0287 --
October 22 All Below 0.038 0.0512 0.0188 0.0339 0.0159 0.0267 --
October 23 All Below 0.0332 0.053 0.0082 0.0218 0.0083 0.0072 --
October 26 All Below 0.0261 0.0459 0.0108 0.0222 0.0081 0.0007 --
October 28 All Below 0.0252 0.047 0.0106 0.0177 0.0072 0.0073 --
October 29 All Below 0.0396 0.0594 0.0142 0.0217 0.014 0.0216 --
October 30 All Below 0.0546 0.0734 0.027 0.0565 0.0263 0.0413 --


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Air Monitoring - 2021 Route 131 Staging Area

Program includes particulate monitoring using real-time meters for particulates (or dust) and volatile organic compounds (VOCs) and sampling for PCB analytical testing during handling of potential PCB-containing material. Corrective action levels have been established based on levels that are safe for the community for particulates, VOCs, and PCBs. The actual monitoring results are compared to the corrective action levels to determine if adjustments in construction are needed. The air monitoring locations and tabulated results are provided below.

Note that air monitoring for PCBs was discontinued in June as material handling was completed. Air monitoring also transitioned to particulate (dust) only once PCB material handling was completed.

Air Monitoring Locations - Rt 131 Staging Area


2021 Air Particulate Data (Corrective Action Level = 0.150 milligram per cubic meter above upwind location)

  Monitoring Station ID (see figure)  
Date Action Level Check SA-AIR1 SA-AIR2 SA-AIR3 SA-AIR4 Notes
October 1 All Below 0.0047 0.0103 0.0108 0.0132 --
October 2 All Below 0.0047 0.012 0.0109 0.0104 --
October 3 All Below 0.0115 0.0147 0.0152 0.0154 --
October 5 All Below 0.0084 0.0171 0.0181 0.0225 --
October 6 All Below 0.0063 0.0112 0.0093 0.0112 --
October 7 All Below 0.014 0.0168 0.0197 0.0347 --
October 8 All Below 0.0079 0.0166 0.0167 0.0168 --
October 9 All Below 0.0258 0.0294 0.0357 0.0525 --


NA = Data not collected in accordance with plan
Particulates (milligrams per cubic meter)
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Air Monitoring - 2021 Dredge Mobile River Stations

Program includes sampling for PCB analytical testing. The corrective action level has been established based on a level that is safe for the community. The actual monitoring results are compared to the corrective action level to determine if adjustments in construction are needed. The air monitoring locations and tabulated results are provided below.

Note that air monitoring for PCBs was performed in April through June concurrent with the river dredge operations. Dredging is complete.

Air Monitoring Locations - Dredge Corridor


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Air Monitoring - 2021 Haverstock Road Support Area

Program includes particulate monitoring using real-time meters for particulates (or dust). The corrective action level has been established based on a level that is safe for the community. The actual monitoring results are compared to the corrective action level to determine if adjustments in construction are needed. The air monitoring locations and tabulated results are provided below.

Air Monitoring Locations - Haverstock Road Area


2021 Air Particulate Data (Corrective Action Level = 0.150 milligram per cubic meter above upwind location)

  Monitoring Station ID (see figure)  
Date Action Level Check HAV-AIR1 HAV-AIR2 HAV-AIR3 Notes
October 1 All Below 0.0154 0.007 0.024 --
October 2 All Below 0.0159 0.017 0.02 --
October 3 All Below 0.0209 0.017 0.0232 --
October 5 All Below 0.0189 0.0167 0.0287 --
October 6 All Below 0.0174 0.0094 0.0273 --
October 7 All Below 0.0225 0.0197 0.0309 --
October 8 All Below 0.0186 0.013 0.0293 --
October 9 All Below 0.0225 0.0344 0.0583 --
October 12 All Below 0.0174 0.0136 0.0331 --
October 13 All Below 0.0203 0.0155 0.0365 --
October 14 All Below 0.0232 0.0203 0.0351 --
October 15 All Below 0.0182 0.0154 0.028 --
October 16 All Below 0.0312 0.0332 0.0475 --
October 19 All Below 0.0142 0.009 0.0243 --
October 20 All Below 0.0141 0.0061 0.0277 --
October 21 All Below 0.0222 0.0194 0.0362 --
October 22 All Below 0.0209 0.0281 0.0421 --
October 23 All Below 0.0113 0.0034 0.0315 --
October 26 All Below 0.0145 0.0104 0.031 --
October 28 All Below 0.0147 0.0126 0.0338 --
October 29 All Below 0.0166 0.0171 0.0406 --
October 30 All Below 0.0318 0.0392 0.0529 --


NA = Data not collected in accordance with plan
Particulates (milligrams per cubic meter)
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Air Monitoring - 2021 Alcoa East Plant Dock Area

Program includes particulate monitoring using real-time meters for particulates (or dust). The corrective action level has been established based on a level that is safe for the community. The actual monitoring results are compared to the corrective action level to determine if adjustments in construction are needed. The air monitoring locations and tabulated results are provided below. Monitoring is only performed when there is active work at this area.

Air Monitoring Locations - Alcoa East Plant Dock Area


2021 Air Particulate Data (Corrective Action Level = 0.150 milligram per cubic meter above upwind location)

  Monitoring Station ID (see figure)  
Date Action Level Check EP-AIR1 EP-AIR2 EP-AIR3 EP-AIR4 Notes
October 1 All Below 0.0331 0.018 0.0177 0.0189 --
October 3 All Below 0.0322 0.0202 0.0178 0.0202 --


NA = Data not collected in accordance with plan
Particulates (milligrams per cubic meter)
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Water Monitoring - 2021 River Remediation

Program includes turbidity monitoring using real-time meters for solids and PCB analytical testing at the water intake locations and total suspended solids (TSS) and PCB analytical testing at the river locations. Corrective action levels have been established based on levels that are safe for the community for both solids and PCBs. The actual monitoring results will be compared to the corrective action levels to determine if adjustments in construction are needed. The water locations and tabulated results are provided below.

Monitoring was performed for 50+ days with half of these days including capping only and the other half with capping and dredging. PCBs were not detected in any samples during routine monitoring. Water monitoring for PCBs was discontinued in June based on these results. Monitoring for solids will continue through the end of construction.

Water Column Monitoring Locations


2021 Water Column Total Suspended Solids Data (Corrective Action Level = 100 mg/L above WC-UP Level at WC-SLR)

  Monitoring Station ID (see figure)  
Date Action Level Check WC-UP1 WC-NF2 WC-NF WC-NF3 WC-MOUTH WC-SLR Notes
October 1 All Below Below detectable levels NA 6.8 NA 7.5 6.2 --


Total Suspended Solids (TSS; milligrams per liter)
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Water Intake Monitoring Locations


2021 Water Intake Turbidity Data (Corrective Action Level = 25 NTU above Baseline Level)

  Monitoring Station ID (see figure)  
Date Action Level Check IN-AE-RAW IN-SRMT-RAW IN-SRMT-FIL Notes
October 1 All Below 0.9 1.6 0.1 --


Turbidity (Nephelometric Turbidity Unit)
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