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Table O-2 <br /> 2020-2021 Groundwater Analytical Results Compared to TACO Tier 1 Remediation Objectives <br /> Former Ameren Decatur MGP Site <br /> Decatur,Illinois <br /> Ingestion Class Indoor Inhalation Remediation <br /> Compound CAS No. I Groundwater Objectives <br /> Remediation <br /> Objectives Residential Industrial/ <br /> Commercial <br /> Volatile Organic Compounds(mg/L) <br /> Benzene 71-43-2 0.005 0.11 0.41 <br /> Ethylbenzene 100-41-4 0.7 0.37 1.4 <br /> Naphthalene 91-20-3 0.14 0.075 0.32 <br /> Toluene 108-88-3 1 530 530 <br /> Xylenes(total) 1330-20-7 10 30 93 <br /> Semi-Volatile Organic Compounds(mg/L) <br /> Acenaphthene 83-32-9 0.42 NV NV <br /> Acenaphthylene* 208-96-8 0.21 NV NV <br /> Anthracene 120-12-7 2.1 NV NV <br /> Benzo(a)anthracene 56-55-3 0.00013 NV NV <br /> Benzo(a)pyrene 50-32-8 0.0002 NV NV <br /> Benzo(g,h,i)perylene* 191-24-2 0.21 NV NV <br /> Benzo(b)fluoranthene 205-99-2 0.00018 NV NV <br /> Benzo(k)fluoranthene 207-08-9 0.00017 NV NV <br /> Chrysene 218-01-9 0.0015 NV NV <br /> Dibenzo(a,h)anthracene 53-70-3 0.0003 NV NV <br /> Fluoranthene 206-44-0 0.28 NV NV <br /> Fluorene 86-73-7 0.28 NV NV <br /> lndeno(1,2,3-c,d)pyrene 193-39-5 0.00043 NV NV <br /> Phenanthrene* 85-01-8 0.21 NV NV <br /> Pyrene 129-00-0 0.21 NV NV <br /> Metals(mg/L) <br /> Arsenic 7440-38-2 0.05 NV NV <br /> Barium 7440-39-3 2 NV NV <br /> Cadmium 7440-43-9 0.005 NV NV <br /> Chromium 7440-47-3 0.1 NV NV <br /> Lead 7439-92-1 0.0075 NV NV <br /> Mercury 7439-97-6 0.002 0.053 0.06 <br /> Selenium 7782-49-2 0.05 NV NV <br /> Silver 7440-22-4 0.05 NV NV <br /> General Chemistry(mg/L) <br /> Cyanide,Total 57-12-ST 0.2 NV NV <br /> Cyanide, Amenable 57-12-5A 0.2 NV NV <br /> HAA Page 2 of 3 August 2023 <br />