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 are summarized below.

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.

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


NA = Data not collected
Particulates (milligrams per cubic meter)
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2021 Air Volatile Organic Compound Data (Corrective Action Level = 25 ppm 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


NA = Data not collected
Volatile Organic Compounds (VOCs parts per million)
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2021 Air PCB Data (Corrective Action Level = 0.100 microgram per cubic meter)

  Monitoring Station ID (see figure)  
Date Action Level Check SLF-AIR1 SLF-AIR2 SLF-AIR3 SLF-AIR4 SLF-AIR-PA SLF-AIR-PB Notes


NA = Analysis not required
Total PCBs (micrograms per cubic meter)
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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.

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
April 6 All Below 0.006 0.007 0.0214 0.0155 --
April 7 All Below 0.0173 0.0103 0.0228 0.0169 --
April 8 All Below 0.0151 0.0076 0.0393 0.0353 --
April 9 All Below 0.014 0.007 0.0391 0.0323 --
April 10 All Below 0.0172 0.0053 0.0218 0.015 --
April 11 All Below 0.043 0.032 0.0416 0.0362 --
April 12 All Below 0.0086 0.0148 0.0141 0.0104 --


NA = Data not collected
Particulates (milligrams per cubic meter)
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2021 Air Volatile Organic Compound Data (Corrective Action Level = 25 ppm above upwind location)

  Monitoring Station ID (see figure)  
Date Action Level Check SA-AIR1 SA-AIR2 SA-AIR3 SA-AIR4 Notes


NA = Data not collected
Volatile Organic Compounds (VOCs parts per million)
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2021 Air PCB Data (Corrective Action Level = 0.100 microgram per cubic meter)

  Monitoring Station ID (see figure)  
Date Action Level Check SA-AIR1 SA-AIR2 SA-AIR3 SA-AIR4 Notes


NA = Analysis not required
Total PCBs (micrograms per cubic meter)
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Air Monitoring Locations - Dredge Corridor


2021 Air PCB Data (Corrective Action Level = 0.100 microgram per cubic meter)

  Monitoring Station ID (see figure)  
Date Action Level Check DC-M1 DC-M2 DC-M3 DC-M4 Notes


NA = Analysis not required
Total PCBs (micrograms per cubic meter)
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Air Monitoring - 2021 Haverstock Road Support Area

Program includes particulate monitoring using real-time meters for particulates (or dust) and volatile organic compounds (VOCs). Corrective action levels have been established based on levels that are safe for the community for particulates and VOCs. 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.

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


NA = Data not collected
Particulates (milligrams per cubic meter)
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2021 Air Volatile Organic Compound Data (Corrective Action Level = 25 ppm above upwind location)

  Monitoring Station ID (see figure)  
Date Action Level Check HAV-AIR1 HAV-AIR2 HAV-AIR3 Notes


NA = Data not collected
Volatile Organic Compounds (VOCs parts per million)
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Air Monitoring - 2021 Alcoa East Plant Dock Area

Program includes particulate monitoring using real-time meters for particulates (or dust) and volatile organic compounds (VOCs). Corrective action levels have been established based on levels that are safe for the community for particulates and VOCs. 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.

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 HAV-AIR1 HAV-AIR2 HAV-AIR3 Notes


NA = Data not collected
Particulates (milligrams per cubic meter)
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2021 Air Volatile Organic Compound Data (Corrective Action Level = 25 ppm above upwind location)

  Monitoring Station ID (see figure)  
Date Action Level Check HAV-AIR1 HAV-AIR2 HAV-AIR3 Notes


NA = Data not collected
Volatile Organic Compounds (VOCs parts per million)
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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. Program also includes total suspended soluds (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 turbidity 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.

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-MOUTH WC-SLR Notes
April 6 All Below Below detectable levels -- Below detectable levels Below detectable levels Below detectable levels --
April 7 All Below Below detectable levels -- Below detectable levels Below detectable levels Below detectable levels --
April 8 All Below Below detectable levels -- 5.1 Below detectable levels Below detectable levels --


Total Suspended Solids (TSS; milligrams per liter)
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2021 Water Column PCB Data (Corrective Action Level at WC-SLR = 0.5 microgram per liter)

  Monitoring Station ID (see figure)  
Date Action Level Check WC-UP2 WC-NF2 WC-NF WC-MOUTH WC-SLR Notes
April 6 All Below -- -- Below detectable levels Below detectable levels Below detectable levels --
April 7 All Below -- -- Below detectable levels Below detectable levels Below detectable levels --
April 8 All Below -- -- Below detectable levels Below detectable levels Below detectable levels --


NA = Data not collected
Volatile Organic Compounds (VOCs parts per million)
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2021 Water Intake PCB Data (Corrective Action Level at WC-SLR = 0.5 microgram per liter)

  Monitoring Station ID (see figure)  
Date Action Level Check WC-AW-RAW WC-SRMT-RAW WC-SRMT-FIL Notes
April 6 All Below -- -- -- --
April 7 All Below Below detectable levels Below detectable levels Below detectable levels --
April 8 All Below Below detectable levels Below detectable levels Below detectable levels --


NA = Data not collected
Volatile Organic Compounds (VOCs parts per million)
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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
April 6 All Below 1.1 1.3 0.2 Baseline monitoring event
April 7 All Below 0.8 1.1 0.2 --
April 8 All Below 1.1 1.3 0.2 --
April 9 All Below 1.0 1.1 0.2 --


NA = Analysis not required
Total PCBs (micrograms per cubic meter)
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