2020 Construction Monitoring

Environmental monitoring for the 2020 construction includes water and air monitoring. Air monitoring is being performed around the secure landfill, Route 131 Staging Area, and dredge area. Water monitoring is being performed in the river and at water intakes. These monitoring activities and results are summarized below.

 

Air Monitoring - 2020 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

Site Map
 

2020 Air Particulate Data
(Corrective Action Level = 0.150 milligrams per cubic meter above upwind location)

May Particulate Data | June Particulate Data | July Particulate Data | August Particulate Data | September Particulate Data |

  Monitoring Station ID (see figure)  
Date Action Level Check SLF-AIR1 SLF-AIR2 SLF-AIR3 SLF-AIR4 SLF-AIR-PA SLF-AIR-PB Notes
Oct 1 All Below 0.0063 0.013 0.0159 0.0111 0.0089 0.0114 --
Oct 2 All Below 0.0062 0.0108 0.0103 0.0083 0.0111 0.0061 --
Oct 3 All Below 0.0037 0.0094 -- 0.0107 0.0135 0.0078 --
Oct 4 All Below 0.0178 0.0204 -- 0.0217 0.0286 0.0089 --
Oct 5 All Below 0.0062 0.009 -- 0.0098 -- -- --
Oct 6 All Below 0.0087 0.0185 0.0199 0.0173 0.0231 0.0177 --
Oct 7 All Below 0.0135 0.0149 0.0178 0.0163 0.02 0.0132 --
Oct 8 All Below 0.0097 0.0158 0.0165 0.0143 0.0159 0.0118 --
Oct 9 All Below 0.008 0.0113 0.0129 0.0102 0.0145 0.0093 --
Oct 10 All Below 0.0088 0.018 0.0164 0.0121 0.018 0.0119 --
Oct 11 All Below 0.0277 0.043 0.0439 0.038 -- -- --
Oct 12 All Below 0.0076 0.0139 0.0098 0.009 -- -- --
Oct 13 All Below 0.0043 0.0086 0.0089 0.0071 0.0176 0.009 --
Oct 14 All Below 0.0048 0.0117 0.0147 0.0283 0.0163 0.0062 --
Oct 15 All Below 0.0123 0.0137 0.0158 0.0145 0.0205 0.0076 --
Oct 16 All Below 0.003 0.006 0.0178 0.0105 0.0074 0.0116 --
Oct 17 All Below 0.0119 0.0204 0.0228 0.0113 0.0183 0.0045 --
Oct 18 All Below 0.0169 0.0157 0.0231 0.0211 0.0248 0.0075 --
Oct 19 All Below 0.0063 0.0087 0.0071 0.008 -- -- --
Oct 20 All Below 0.0079 0.0163 0.0146 0.0119 0.0115 0.0035 --
Oct 21 All Below 0.0072 0.0111 0.0109 0.0098 0.0139 0.003 --
Oct 22 All Below 0.0085 0.0121 0.014 0.0129 0.0145 0.0061 --
Oct 23 All Below 0.0084 0.0111 0.0139 0.0135 0.016 0.0061 --
Oct 24 All Below 0.01 0.0155 0.0151 0.0157 0.0163 0.0187 --
Oct 25 All Below 0.0051 0.0075 0.0051 0.003 0 0.0025 --
Oct 26 All Below 0.0087 0.0075 0.007 0.0058 -- -- --

NA = Data not collected
Particulates (milligrams per cubic meter)
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2020 Air Volatile Organic Compound Data
(Corrective Action Level = 25 ppm above upwind location)

May VOC Data | June VOC Data | July VOC Data | August VOC Data | September VOC Data |

  Monitoring Station ID (see figure)  
Date Action Level Check SLF-AIR1 SLF-AIR2 SLF-AIR3 SLF-AIR4 SLF-AIR-PA SLF-AIR-PB Notes
Oct 1 All Below 0.0597 0.0569 0.1741 0.0383 0.6123 0.1215 --
Oct 2 All Below 0.0813 0.2431 0.3699 0.0359 3.4163 0.0834 --
Oct 3 All Below 0.0317 0.0413 2.9789 0.0185 1.0449 0.0517 --
Oct 4 All Below 0.0653 0.1285 0.9585 0.0009 0.4203 0.118 --
Oct 5 All Below 0.0463 0.0804 2.6297 0.0136 -- -- --
Oct 6 All Below 0.0698 0.0881 0.3941 0.0027 2.8268 0.0901 --
Oct 7 All Below 0.0918 0.09 93.751 0.0748 0.3611 0.0613 SLF-AIR3 levels investigated, no unique cause identified and readings dropped below action level during investigation and remained below for the remainder of the day.
Oct 8 All Below 0.082 0.122 0 0.0786 8.0227 0.2636 SLF-AIR3 levels not related to field operations.
Oct 9 All Below 0.0611 0.1177 0 0.0009 1.5327 0.266 --
Oct 10 All Below 0.0026 0.0012 0 0.0711 0.7843 0.0161 --
Oct 11 All Below 0.0837 0.0649 0.2443 0.0024 -- -- --
Oct 12 All Below 0.0962 0.0549 0.2131 0.0057 -- -- --
Oct 13 All Below 0.0225 0.0224 0.0539 0.0088 2.6832 0 --
Oct 14 All Below 0.1003 0.1375 0.0551 0.0153 2.1303 0.0581 --
Oct 15 All Below 0.0824 0.1393 2.3489 0.0654 3.2859 0.141 --
Oct 16 All Below 0.0445 0.0444 0.0023 0.0007 0.8096 0.0857 --
Oct 17 All Below 0.0781 0.1411 0.2502 0.0218 0.3979 0.1492 --
Oct 18 All Below 0.1237 0.1091 4.7007 0.0981 2.2903 0.1099 --
Oct 19 All Below 0.0685 0.0705 0.0987 0.0173 -- -- --
Oct 20 All Below 0.0541 0 0 0.0136 1.7739 0.4941 --
Oct 21 All Below 0.0826 0.1183 0.0635 0.0538 2.2018 0.1448 --
Oct 22 All Below 2.3655 0.0591 16.774 0.9919 8.0063 0.1126 SLF-AIR3 and SLF-AIR-PA levels not related to field activities
Oct 23 All Below 0.1133 0 0.4073 0.0141 1.3115 0.0305 --
Oct 24 All Below 0.0771 0.0515 0 0.0186 8.3094 0.1612 SLF-AIR-PA levels not related to field activities
Oct 25 All Below 0.1243 0.2408 0.0025 0.0525 1.7986 0.2401 --
Oct 26 All Below 0.0005 0.2417 0.0153 0.0208 -- -- --

NA = Data not collected
Volatile Organic Compounds (VOCs parts per million)
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2020 Air PCB Data
(Corrective Action Level = 0.100 micrograms per cubic meter)

May PCB Data | June PCB Data | July PCB Data | August PCB Data | September PCB Data |

  Monitoring Station ID (see figure)  
Date Action Level Check SLF-AIR1 SLF-AIR2 SLF-AIR3 SLF-AIR4 SLF-AIR-PA SLF-AIR-PB Notes
Oct 1 All Below 0.000050 0.000440 0.007060 0.001400 Below detectable levels Below detectable levels --
Oct 2 All Below 0.000040 0.000490 0.000270 0.000940 Below detectable levels Below detectable levels --
Oct 3 All Below 0.000120 0.000340 0.000180 0.000080 Below detectable levels Below detectable levels --
Oct 4 All Below 0.000060 0.000180 0.000130 0.000060 Below detectable levels Below detectable levels --
Oct 5 All Below 0.000090 0.000200 0.000150 0.000110 -- -- --
Oct 6 All Below 0.000080 0.000230 0.000140 0.000980 Below detectable levels Below detectable levels --
Oct 7 All Below 0.000080 0.000480 0.001540 0.002200 Below detectable levels Below detectable levels --
Oct 8 All Below 0.000060 0.000270 0.000110 0.000120 Below detectable levels Below detectable levels --
Oct 9 All Below 0.000050 0.000110 0.000060 Below detectable levels Below detectable levels Below detectable levels --
Oct 10 All Below 0.000070 0.000310 0.000120 0.000120 Below detectable levels Below detectable levels --
Oct 11 All Below 0.000140 0.000550 0.001390 0.001430 -- -- --
Oct 12 All Below 0.000120 0.000090 0.000070 0.000070 -- -- --
Oct 13 All Below 0.000100 0.000130 0.000110 0.000080 Below detectable levels Below detectable levels --
Oct 14 All Below 0.000160 0.000300 0.000180 0.000120 Below detectable levels Below detectable levels --
Oct 15 All Below 0.000120 0.000230 0.000120 0.000090 Below detectable levels Below detectable levels --
Oct 16 All Below 0.000100 0.000510 0.001870 0.002500 -- -- --
Oct 17 All Below 0.000080 0.000290 0.001780 0.001770 Below detectable levels Below detectable levels --
Oct 18 All Below 0.000080 0.000200 0.002050 0.001350 Below detectable levels Below detectable levels --
Oct 19 All Below 0.000240 0.000320 Below detectable levels 0.001770 -- -- --
Oct 20 All Below 0.000110 0.000110 0.000150 0.000080 Below detectable levels Below detectable levels --
Oct 21 All Below 0.000130 0.000110 0.000070 0.000040 Below detectable levels Below detectable levels --

NA = Analysis not required
Total PCBs (micrograms per cubic meter)
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Air Monitoring - 2020 River Remediation (Including Route 131 Staging Area and River Locations)

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

Site Map
 


2020 Air Particulate Data
(Corrective Action Level = 0.150 milligrams per cubic meter above upwind location)

May Staging Area Air Particulate Data | June Staging Area Air Particulate Data | July Staging Area Air Particulate Data | August Staging Area Air Particulate Data | September Staging Area Air Particulate Data |

  Monitoring Station ID (see figure)  
Date Action Level Check SA-AIR1 SA-AIR2 SA-AIR3 SA-AIR4 Notes
Oct 1 All Below 0.0079 0.009 0.0051 0.0328 --
Oct 2 All Below 0.0111 0.0132 0.0033 0.0186 --
Oct 3 All Below 0.0187 0.0133 0.0045 0.0212 --
Oct 4 All Below 0.0218 0.0275 0.0038 0.0215 --
Oct 5 All Below 0.0105 0.01 0.0042 0.0177 --
Oct 6 All Below 0.0195 0.0203 0.0068 0.0263 --
Oct 7 All Below 0.0175 0.0261 0.0081 0.0905 --
Oct 8 All Below 0.0142 0.0159 0.0055 0.026 --
Oct 9 All Below 0.014 0.0207 0.0049 0.0305 --
Oct 10 All Below 0.0103 0.0128 0.0048 0.024 --
Oct 11 All Below 0.0375 0.0441 0.012 0.0559 --
Oct 12 All Below 0.0107 0.0145 -0.0091 0.015 SA-AIR3 was re-calibrated. All readings were very low with all levels just below zero.
Oct 13 All Below 0.0126 0.0159 0.006 0.0163 --
Oct 14 All Below 0.0151 0.0174 0.006 0.0251 --
Oct 15 All Below 0.0098 0.0172 0.0057 0.025 --
Oct 16 All Below 0.0156 0.0106 0.0089 0.0181 --
Oct 17 All Below 0.0098 0.0121 0.0063 0.0287 --
Oct 18 All Below 0.0398 0.0428 0.0064 0.0423 --
Oct 19 All Below 0.0072 0.0102 0.0058 0.0165 --
Oct 20 All Below 0.0113 0.0137 0.0043 0.0191 --
Oct 21 All Below 0.0117 0.0148 0.006 0.0184 --
Oct 22 All Below 0.0145 0.0157 0.0055 0.0215 --
Oct 23 All Below 0.0171 0.1105 0.0078 0.0261 SA-AIR2 levels not related to field activities
Oct 24 All Below 0.0213 308.43 0.0075 0.0373 SA-AIR2 levels not related to field activities
Oct 25 All Below 0.0051 0.0079 0.0033 0.013 --
Oct 26 All Below 0.0081 0.0097 0.005 0.016 --

NA = Data not collected or recorded
Particulates (milligrams per cubic meter)
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2020 Air Volatile Organic Compound Data
(Corrective Action Level = 25 ppm above upwind location)

May Staging Area VOC Data | June Staging Area VOC Data | July Staging Area VOC Data | August Staging Area VOC Data | September Staging Area VOC Data |

  Monitoring Station ID (see figure)  
Date Action Level Check SA-AIR1 SA-AIR2 SA-AIR3 SA-AIR4 Notes
Oct 1 All Below 0.0175 0.1232 0.0887 0.0741 --
Oct 2 All Below 0.031 0.3823 0.0055 0.0457 --
Oct 3 All Below 0.0307 0.0821 0.003 0.8038 --
Oct 4 All Below 0.0309 0.3651 0.0003 0 --
Oct 5 All Below 0.0265 0.5589 0 0 --
Oct 6 All Below 0.0314 0.4768 0.0072 0 --
Oct 7 All Below 0.0321 0.5099 0.0044 1.1271 --
Oct 8 All Below 0.0274 0.3126 0.0245 1.9303 --
Oct 9 All Below 0.0451 0.5261 0.0488 0 --
Oct 10 All Below 0.0475 0.5626 0.0445 0 --
Oct 11 All Below 0.0361 0.0192 0.0457 0.9077 --
Oct 12 All Below 0.0412 0.1383 0.0453 0 --
Oct 13 All Below 0.0349 0.031 0.0425 0.4999 --
Oct 14 All Below 0.0169 0 0 1.0329 --
Oct 15 All Below 0.025 0.1488 0.0183 1.6247 --
Oct 16 All Below 0.0152 0.0972 0.0016 1.0145 --
Oct 17 All Below 0.0347 0 0.0302 0.6439 --
Oct 18 All Below 0.0393 0.1555 0.0417 0.2655 --
Oct 19 All Below 0.0336 0.1775 0.0299 2.596 --
Oct 20 All Below 0.0264 0 0.0035 5.1233 SA-AIR4 levels not related to field activities
Oct 21 All Below 0.0341 0 0.0095 0 --
Oct 22 All Below 0.0342 2.7187 0.0225 1.4911 --
Oct 23 All Below 0.0251 0 0.0126 0 --
Oct 24 All Below 0.0114 0 0.0358 0.0012 --
Oct 25 All Below 0.0398 0.1007 0.0577 0 --
Oct 26 All Below 0.0387 0.2142 0.0463 0 --

NA = Data not collected or recorded
Volatile Organic Compounds (VOCs parts per million)
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2020 Air PCB Data - Staging Area
(Corrective Action Level = 0.100 micrograms per cubic meter)

May Staging Area PCB Data | June Staging Area PCB Data | July Staging Area PCB Data | August Staging Area PCB Data | September Staging Area PCB Data |

  Monitoring Station ID (see figure)  
Date Action Level Check SA-AIR1 SA-AIR2 SA-AIR3 SA-AIR4 Notes
Oct 1 All Below Below detectable levels Below detectable levels 0.001230 0.001450 --
Oct 2 All Below Below detectable levels Below detectable levels 0.002230 0.002840 --
Oct 3 All Below Below detectable levels Below detectable levels 0.003230 0.000130 --
Oct 4 All Below Below detectable levels Below detectable levels 0.000920 0.000590 --
Oct 5 All Below Below detectable levels Below detectable levels 0.000760 0.000080 --
Oct 6 All Below Below detectable levels Below detectable levels 0.001200 0.000070 --
Oct 7 All Below Below detectable levels Below detectable levels 0.000040 0.002330 --
Oct 8 All Below Below detectable levels Below detectable levels 0.002320 0.002450 --
Oct 9 All Below Below detectable levels Below detectable levels 0.005520 0.000080 --
Oct 10 All Below Below detectable levels Below detectable levels 0.000160 0.000190 --
Oct 11 All Below Below detectable levels Below detectable levels 0.002080 0.002070 --
Oct 12 All Below Below detectable levels Below detectable levels 0.000110 0.000100 --
Oct 13 All Below Below detectable levels Below detectable levels 0.000080 0.000060 --
Oct 14 All Below Below detectable levels Below detectable levels 0.000190 0.000140 --
Oct 15 All Below Below detectable levels Below detectable levels 0.001800 0.000100 --
Oct 16 All Below Below detectable levels Below detectable levels 0.000230 0.000240 --
Oct 17 All Below Below detectable levels Below detectable levels 0.000090 0.001650 --
Oct 18 All Below Below detectable levels Below detectable levels 0.000160 0.000100 --
Oct 19 All Below Below detectable levels Below detectable levels 0.000150 0.000230 --
Oct 20 All Below Below detectable levels Below detectable levels 0.001860 0.000180 --
Oct 21 All Below Below detectable levels Below detectable levels 0.000110 0.000110 --

NA = Data not collected or recorded
Total PCBs (micrograms per cubic meter)
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Dredge Corridor Monitoring Locations (click to enlarge)

Site Map
 

2020 Air PCB Data - Mobile River Stations
(Corrective Action Level = 0.100 micrograms per cubic meter)

May Mobile River Stations PCB Data | June Mobile River Stations PCB Data | July Mobile River Stations PCB Data | August Mobile River Stations PCB Data | September Mobile River Stations PCB Data |

  Monitoring Station ID (see figure)  
Date Action Level Check DC-M1 DC-M2 DC-M3 DC-M4 Notes
Oct 2 All Below Below Detectable Levels Below Detectable Levels Below Detectable Levels Below Detectable Levels --
Oct 3 All Below Below Detectable Levels Below Detectable Levels Below Detectable Levels Below Detectable Levels --
Oct 4 All Below Below Detectable Levels Below Detectable Levels Below Detectable Levels Below Detectable Levels --

NA = Data not collected or recorded
Total PCBs (micrograms per cubic meter)
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Water Monitoring - 2020 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 (click to enlarge)

Site Map
 

2020 Water Column Total Suspended Solids Data
(Corrective Action Level = 100 mg/L above WC-UP Level at WC-SLR)

May Water Column TSS Data | June Water Column TSS Data | July Water Column TSS Data | August Water Column TSS Data | September Water Column TSS Data |

  Monitoring Station ID (see figure)  
Date Action Level Check WC-UP WC-NF2 WC-NF WC-MOUTH WC-SLR Notes
Oct 1 All Below 5.2 22.0 Below detectable levels -- Below detectable levels --
Oct 2 All Below Below detectable levels 9.2 Below detectable levels -- Below detectable levels --
Oct 3 All Below Below detectable levels 10.8 Below detectable levels -- Below detectable levels --
Oct 5 All Below Below detectable levels 5.6 Below detectable levels -- Below detectable levels --
Oct 6 All Below Below detectable levels 6.4 5.2 -- Below detectable levels --
Oct 7 All Below Below detectable levels 5.6 Below detectable levels -- Below detectable levels --
Oct 8 All Below Below detectable levels 12.0 Below detectable levels -- Below detectable levels --
Oct 9 All Below Below detectable levels 7.2 -- Below detectable levels Below detectable levels --
Oct 12 All Below Below detectable levels 4.4 -- Below detectable levels Below detectable levels --
Oct 13 All Below Below detectable levels 4.8 -- Below detectable levels Below detectable levels --
Oct 14 All Below Below detectable levels 12.0 -- Below detectable levels Below detectable levels --
Oct 15 All Below 10.8 Below detectable levels 5.6 -- Below detectable levels --
Oct 16 All Below Below detectable levels 11.6 Below detectable levels -- Below detectable levels --
Oct 17 All Below Below detectable levels 10.8 Below detectable levels -- Below detectable levels --

Total Suspended Solids (TSS; milligrams per liter)
TSS values in parentheses represent an additional NF station sampled closer to the upstream work platform.
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2020 Water Column PCB Data
(Corrective Action Level at WC-SLR = 0.5 micrograms per liter)

May Water Column PCB Data | June Water Column PCB Data | July Water Column PCB Data | August Water Column PCB Data | September Water Column PCB Data |

  Monitoring Station ID (see figure)  
Date Action Level Check WC-UP2 WC-NF WC-SLR Notes
Oct 1 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 2 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 3 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 5 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 6 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 7 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 8 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 13 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 19 All Below -- -- --
Oct 20 All Below -- -- --
Oct 21 All Below -- -- --
Oct 22 All Below -- -- --
Oct 23 All Below -- -- --
Oct 24 All Below -- -- --

Total PCBs (micrograms per liter)
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Water Intake Monitoring Locations (click to enlarge)

Site Map
 

2020 Water Intake Turbidity Data
(Corrective Action Level = 25 NTU above Baseline Level)

May Intake Turbidity Data | June Intake Turbidity Data | July Intake Turbidity Data | August Intake Turbidity Data | September Intake Turbidity Data |

  Monitoring Station ID (see figure)  
Date Action Level Check IN-AE-RAW IN-SRMT-RAW IN-SRMT-FIL Notes
Oct 1 All Below 0.9 0.6 0.1 --
Oct 2 All Below 0.5 0.8 0.2 --
Oct 3 All Below 0.7 0.9 0.1 --
Oct 5 All Below 1.0 0.6 0.2 --
Oct 6 All Below 1.2 0.8 0.3 --
Oct 7 All Below 0.2 0.7 0.2 --
Oct 8 All Below 0.7 0.8 0.3 --
Oct 9 All Below 0.4 2.9 0.2 --
Oct 12 All Below 0.4 1.3 0.2 --
Oct 13 All Below 0.8 0.6 0.3 --
Oct 14 All Below 0.2 2.0 0.2 --
Oct 15 All Below 0.8 0.7 0.2 --
Oct 16 All Below 0.3 1.3 0.3 --
Oct 17 All Below 0.3 1.3 0.3 --
Oct 19 All Below 0.3 2.3 0.1 --
Oct 20 All Below 0.4 2.0 0.4 --
Oct 21 All Below 0.1 0.9 0.0 --
Oct 22 All Below 0.2 1.1 0.4 --
Oct 23 All Below 0.1 1.1 0.0 --
Oct 24 All Below 0.3 0.7 0.0 --

NA = Data not collected or recorded
Turbidity (nephelometric turbidity unit; NTU)
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2020 Water Intake PCB Data
(Corrective Action Level = 0.5 micrograms per liter)

May Intake PCB Data | June Intake PCB Data | July Intake PCB Data | August Intake PCB Data | September Intake PCB Data |

  Monitoring Station ID (see figure)  
Date Action Level Check IN-AE-RAW IN-SRMT-RAW IN-SRMT-FIL Notes
Oct 1 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 2 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 3 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 5 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 6 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 7 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 8 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 13 All Below Below detectable levels Below detectable levels Below detectable levels
Oct 19 All Below -- -- --
Oct 20 All Below -- -- --
Oct 21 All Below -- -- --
Oct 22 All Below -- -- --
Oct 23 All Below -- -- --
Oct 24 All Below -- -- --

Total PCBs (micrograms per liter)
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