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HomeMy WebLinkAboutDERR-2024-008612 Appendix G Contaminant Persistence Supporting Information Appendix G Contaminant Persistence Supporting Information MW-01S Chart 0 50 100 150 200 250 300 350 400 450 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-01S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 1 of 66 Appendix G Contaminant Persistence Supporting Information MW-01D Chart 0 2 4 6 8 10 12 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-01D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 2 of 66 Appendix G Contaminant Persistence Supporting Information MW-02 Chart 0 50 100 150 200 250 300 350 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-02: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 3 of 66 Appendix G Contaminant Persistence Supporting Information MW-03RA Chart 0 5 10 15 20 25 30 35 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-03RA: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 4 of 66 Appendix G Contaminant Persistence Supporting Information MW-03RB Chart 0 50 100 150 200 250 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-03RB: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 5 of 66 Appendix G Contaminant Persistence Supporting Information MW-03RC Chart 0 1 2 3 4 5 6 7 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-03RC: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 6 of 66 Appendix G Contaminant Persistence Supporting Information MW-03RD Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-03RD: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 7 of 66 Appendix G Contaminant Persistence Supporting Information MW-04 Chart 0 20 40 60 80 100 120 140 160 180 200 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-04: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 8 of 66 Appendix G Contaminant Persistence Supporting Information MW-05R Chart 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-05R: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 9 of 66 Appendix G Contaminant Persistence Supporting Information MW-06 Chart 0 2 4 6 8 10 12 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-06: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 10 of 66 Appendix G Contaminant Persistence Supporting Information MW-08A Chart 0 10 20 30 40 50 60 70 80 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-08A: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 11 of 66 Appendix G Contaminant Persistence Supporting Information MW-08B Chart 0 1 2 3 4 5 6 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-08B: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 12 of 66 Appendix G Contaminant Persistence Supporting Information MW-08C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-08C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 13 of 66 Appendix G Contaminant Persistence Supporting Information MW-12S Chart 0 0.5 1 1.5 2 2.5 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-12S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 14 of 66 Appendix G Contaminant Persistence Supporting Information MW-12D Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-12D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 15 of 66 Appendix G Contaminant Persistence Supporting Information MW-13S Chart 0 5 10 15 20 25 30 35 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-13S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 16 of 66 Appendix G Contaminant Persistence Supporting Information MW-13D Chart 0 10 20 30 40 50 60 70 80 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-13D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 17 of 66 Appendix G Contaminant Persistence Supporting Information MW-13L Chart 0 10 20 30 40 50 60 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-13L: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 18 of 66 Appendix G Contaminant Persistence Supporting Information MW-14S Chart 0 2 4 6 8 10 12 14 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-14S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 19 of 66 Appendix G Contaminant Persistence Supporting Information MW-14D Chart 0 5 10 15 20 25 30 35 40 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-14D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 20 of 66 Appendix G Contaminant Persistence Supporting Information MW-15S Chart 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-15S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 21 of 66 Appendix G Contaminant Persistence Supporting Information MW-15D Chart 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-15D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 22 of 66 Appendix G Contaminant Persistence Supporting Information MW-16S Chart 0 5 10 15 20 25 30 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-16S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 23 of 66 Appendix G Contaminant Persistence Supporting Information MW-16D Chart 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-16D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 24 of 66 Appendix G Contaminant Persistence Supporting Information MW-17S Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-17S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 25 of 66 Appendix G Contaminant Persistence Supporting Information MW-17D Chart 0 0.5 1 1.5 2 2.5 3 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-17D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 26 of 66 Appendix G Contaminant Persistence Supporting Information MW-18 Chart 0 20 40 60 80 100 120 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-18: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 27 of 66 Appendix G Contaminant Persistence Supporting Information MW-19 Chart 0 10 20 30 40 50 60 70 80 90 100 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-19: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 28 of 66 Appendix G Contaminant Persistence Supporting Information MW-20S Chart 0 1 2 3 4 5 6 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-20S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 29 of 66 Appendix G Contaminant Persistence Supporting Information MW-20D Chart 0 2 4 6 8 10 12 14 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-20D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 30 of 66 Appendix G Contaminant Persistence Supporting Information MW-21 Chart 0 0.5 1 1.5 2 2.5 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-21: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 31 of 66 Appendix G Contaminant Persistence Supporting Information MW-22 Chart 0 0.5 1 1.5 2 2.5 3 3.5 4 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-22: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 32 of 66 Appendix G Contaminant Persistence Supporting Information MW-23A Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-23A: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 33 of 66 Appendix G Contaminant Persistence Supporting Information MW-23B Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-23B: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 34 of 66 Appendix G Contaminant Persistence Supporting Information MW-23C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-23C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 35 of 66 Appendix G Contaminant Persistence Supporting Information MW-24 Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-24: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 36 of 66 Appendix G Contaminant Persistence Supporting Information MW-25A Chart 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-25A: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 37 of 66 Appendix G Contaminant Persistence Supporting Information MW-25B Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-25B: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 38 of 66 Appendix G Contaminant Persistence Supporting Information MW-25C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-25C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 39 of 66 Appendix G Contaminant Persistence Supporting Information MW-26A Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-26A: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 40 of 66 Appendix G Contaminant Persistence Supporting Information MW-26B Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-26B: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 41 of 66 Appendix G Contaminant Persistence Supporting Information MW-26C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-26C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 42 of 66 Appendix G Contaminant Persistence Supporting Information MW-26D Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-26D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 43 of 66 Appendix G Contaminant Persistence Supporting Information MW-27 Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-27: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 44 of 66 Appendix G Contaminant Persistence Supporting Information MW-28 Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-28: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 45 of 66 Appendix G Contaminant Persistence Supporting Information MW-29A Chart 0 2 4 6 8 10 12 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-29A: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 46 of 66 Appendix G Contaminant Persistence Supporting Information MW-29B Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-29B: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 47 of 66 Appendix G Contaminant Persistence Supporting Information MW-29C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-29C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 48 of 66 Appendix G Contaminant Persistence Supporting Information MW-30RA Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-30RA: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 49 of 66 Appendix G Contaminant Persistence Supporting Information MW-30RB Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-30RB: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 50 of 66 Appendix G Contaminant Persistence Supporting Information MW-30C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-30C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 51 of 66 Appendix G Contaminant Persistence Supporting Information MW-31A Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-31A: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 52 of 66 Appendix G Contaminant Persistence Supporting Information MW-31B Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-31B: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 53 of 66 Appendix G Contaminant Persistence Supporting Information MW-31C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-31C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 54 of 66 Appendix G Contaminant Persistence Supporting Information MW-32A Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-32A: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 55 of 66 Appendix G Contaminant Persistence Supporting Information MW-32B Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-32B: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 56 of 66 Appendix G Contaminant Persistence Supporting Information MW-32C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-32C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 57 of 66 Appendix G Contaminant Persistence Supporting Information MW-34A Chart 0 5 10 15 20 25 30 35 40 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-34A: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 58 of 66 Appendix G Contaminant Persistence Supporting Information MW-34B Chart 0 2 4 6 8 10 12 14 16 18 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-34B: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 59 of 66 Appendix G Contaminant Persistence Supporting Information MW-34C Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-34C: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 60 of 66 Appendix G Contaminant Persistence Supporting Information MW-34D Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-34D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 61 of 66 Appendix G Contaminant Persistence Supporting Information MW-36 Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-36: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 62 of 66 Appendix G Contaminant Persistence Supporting Information MW-37S Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-37S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 63 of 66 Appendix G Contaminant Persistence Supporting Information MW-37D Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-37D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 64 of 66 Appendix G Contaminant Persistence Supporting Information MW-38S Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-38S: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 65 of 66 Appendix G Contaminant Persistence Supporting Information MW-38D Chart 0 0.2 0.4 0.6 0.8 1 1.2 Or g a n i c C o m p o u n d C o n c e n t r a t i o n ( µ g / L ) Sample Date MW-38D: Chlorinated Ethene and Daughter Product Mass Concentrations PCE TCE cis-1,2-DCE PCE-ND TCE-ND cis-1,2-DCE-ND OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 66 of 66 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Trend1 NO TREND NO TREND, >50% ND NO TREND, >50% ND INCREASING, >50% ND INCREASING, >50% ND INCREASING, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND NO TREND Mann-Kendall Confidence Level 88.4% 77.4% 56.2% 98.9% 98.9% 98.9%56.0% 70.4% Max Concentration (µg/L)2 9.9 5 5 0.5 0.5 0.5 1 1 1280 0.06 Results in dataset (total) 18 16 16 10 10 10 4 4 7 10 Start Date 6/30/1998 6/30/1998 6/30/1998 4/26/2016 4/26/2016 4/26/2016 12/6/2019 12/6/2019 11/10/1998 6/30/1998 End Date 44277 44277 44277 44277 44277 44277 44180 44180 44180 42634 Dataset Mean (µg/L)2 2.68 0.80 0.83 0.43 0.43 0.43 1.00 1.00 260.15 0.03 COV 1.34 1.57 1.49 0.28 0.28 0.28 0.00 0.00 1.74 0.93 Mann-Kendall S -31 16 4 21 21 21 - - -2 7 Mann-Kendall Var(S) 631.67 399.33 364.67 77.00 77.00 77.00 - - 43.33 125.00 Mann-Kendall p-value 0.12 0.23 0.44 0.01 0.01 0.01 - - 0.44 0.30 Trend1 DECREASING DECREASING DECREASING NO TREND, >50% ND INCREASING, >50% ND INCREASING, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND DECREASING Mann-Kendall Confidence Level 99.3% 100.0% 100.0% 52.3%98.6% 98.6%71.7% 99.3% Max Concentration (µg/L)2 420 4 5 5 0.5 0.5 1 1 287 2.61 Results in dataset (total) 15 15 15 15 9 9 3 3 6 15 Start Date 6/30/1998 6/30/1998 6/30/1998 6/30/1998 4/28/2016 4/28/2016 6/21/2020 6/21/2020 11/11/1998 6/30/1998 End Date 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 12/16/2020 12/16/2020 12/16/2020 3/22/2021 Dataset Mean (µg/L)2 209.73 1.77 1.42 0.86 0.42 0.42 1.00 1.00 223.19 1.29 COV 0.43 0.57 1.03 1.49 0.30 0.30 0.00 0.00 0.49 0.44 Mann-Kendall S -50 -75 -86 2 18 18 - - 4 -51 Mann-Kendall Var(S) 404.67 404.33 407.33 312.67 60.00 60.00 - - 27.33 408.33 Mann-Kendall p-value 0.01 0.00 0.00 0.48 0.01 0.01 - - 0.28 0.01 Trend1 NO TREND DECREASING PROBABLY DECREASING NO TREND, >50% ND INCREASING, >50% ND INCREASING, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND NO TREND Mann-Kendall Confidence Level 76.2% 97.9% 92.2% 72.8% 98.9% 98.9%88.5% 77.8% Max Concentration (µg/L)2 296 25 25 25 0.5 0.5 1 1 705 1.81 Results in dataset (total) 14 13 13 13 10 10 4 4 7 14 Start Date 11/11/1998 11/11/1998 11/11/1998 11/11/1998 4/27/2016 4/27/2016 12/5/2019 12/5/2019 11/11/1998 11/11/1998 End Date 3/23/2021 3/23/2021 3/23/2021 3/23/2021 3/23/2021 3/23/2021 12/16/2020 12/16/2020 12/16/2020 3/23/2021 Dataset Mean (µg/L)2 184.71 2.65 2.36 2.45 0.43 0.43 1.00 1.00 369.31 1.12 COV 0.35 2.55 2.88 2.78 0.28 0.28 0.00 0.00 0.64 0.35 Mann-Kendall S 14 -34 -24 10 21 21 - - 9 15 Mann-Kendall Var(S) 332.67 261.33 264.00 220.67 77.00 77.00 - - 44.33 333.67 Mann-Kendall p-value 0.24 0.02 0.08 0.27 0.01 0.01 - - 0.11 0.22 Trend1 STABLE STABLE STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA DECREASING STABLE Mann-Kendall Confidence Level 67.6% 77.6% 50.0% 50.0% 50.0% 50.0%97.0% 61.8% Max Concentration (µg/L)2 32 0.5 0.5 0.5 0.5 0.5 1 1 440 0.19 Results in dataset (total) 7 7 7 7 7 7 4 4 6 7 Start Date 12/13/2018 12/13/2018 12/13/2018 12/13/2018 12/13/2018 12/13/2018 12/7/2019 12/7/2019 12/13/2018 12/13/2018 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 12/11/2020 12/11/2020 12/11/2020 3/21/2021 Dataset Mean (µg/L)2 25.09 0.22 0.50 0.50 0.50 0.50 1.00 1.00 390.83 0.15 COV 0.42 0.59 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.42 Mann-Kendall S -4 -6 0 0 0 0 - - -11 -3 Mann-Kendall Var(S) 43.33 43.33 0.00 0.00 0.00 0.00 - - 28.33 44.33 Mann-Kendall p-value 0.32 0.22 0.50 0.50 0.50 0.50 - - 0.03 0.38 Well MW-01D MW-02 MW-03RA MW-01S OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 1 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 STABLE DECREASING DECREASING STABLE STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE STABLE Mann-Kendall Confidence Level 62.1% 96.7% 99.6% 83.0% 50.0% 50.0%87.0% 72.6% Max Concentration (µg/L)2 230 2.1 1.5 0.14 0.5 0.5 1 1 199 1.42 Results in dataset (total) 7 7 7 7 7 7 4 4 6 7 Start Date 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/8/2019 12/8/2019 12/27/2018 12/27/2018 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 12/11/2020 12/11/2020 12/11/2020 3/21/2021 Dataset Mean (µg/L)2 211.43 1.89 1.34 0.12 0.50 0.50 1.00 1.00 177.33 1.30 COV 0.10 0.07 0.09 0.11 0.00 0.00 0.00 0.00 0.10 0.10 Mann-Kendall S -3 -13 -18 -7 0 0 - - -7 -5 Mann-Kendall Var(S) 42.33 42.33 41.33 39.67 0.00 0.00 - - 28.33 44.33 Mann-Kendall p-value 0.38 0.03 0.00 0.17 0.50 0.50 - - 0.13 0.27 Trend1 STABLE STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND STABLE Mann-Kendall Confidence Level 77.6% 50.0% 50.0% 50.0% 50.0% 50.0%64.6% 77.6% Max Concentration (µg/L)2 6.5 0.5 0.5 0.5 0.5 0.5 1 1 90.1 0.04 Results in dataset (total) 7 7 7 7 7 7 4 4 6 7 Start Date 12/17/2018 12/17/2018 12/17/2018 12/17/2018 12/17/2018 12/17/2018 12/7/2019 12/7/2019 12/17/2018 12/17/2018 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 12/11/2020 12/11/2020 12/11/2020 3/21/2021 Dataset Mean (µg/L)2 6.14 0.50 0.50 0.50 0.50 0.50 1.00 1.00 77.55 0.04 COV 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.06 Mann-Kendall S -6 0 0 0 0 0 - - 3 -6 Mann-Kendall Var(S) 43.33 0.00 0.00 0.00 0.00 0.00 - - 28.33 43.33 Mann-Kendall p-value 0.22 0.50 0.50 0.50 0.50 0.50 - - 0.35 0.22 Trend1 NO TREND, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level 87.9% 50.0% 50.0% 50.0% 50.0% 50.0% Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 87 0.02 Results in dataset (total) 6 6 6 6 6 6 4 4 5 3 Start Date 3/27/2019 3/27/2019 3/27/2019 3/27/2019 3/27/2019 3/27/2019 12/7/2019 12/7/2019 3/27/2019 3/27/2019 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 12/11/2020 12/11/2020 12/11/2020 12/11/2020 Dataset Mean (µg/L)2 0.45 0.50 0.50 0.50 0.50 0.50 0.71 1.00 83.96 0.01 COV 0.29 0.00 0.00 0.00 0.00 0.00 0.49 0.00 0.03 0.86 Mann-Kendall S 5 0 0 0 0 0 - - - - Mann-Kendall Var(S) 11.67 0.00 0.00 0.00 0.00 0.00 - - - - Mann-Kendall p-value 0.12 0.50 0.50 0.50 0.50 0.50 - - - - Trend1 DECREASING DECREASING DECREASING NO TREND, >50% ND INCREASING, >50% ND INCREASING, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA INCREASING DECREASING Mann-Kendall Confidence Level 100.0% 100.0% 95.8% 72.8%98.9% 98.9%96.4% 100.0% Max Concentration (µg/L)2 190 2 2.5 5 0.5 0.5 1 1 281 1.17 Results in dataset (total) 14 13 13 13 10 10 4 4 7 14 Start Date 11/11/1998 11/11/1998 11/11/1998 11/11/1998 4/27/2016 4/27/2016 12/5/2019 12/5/2019 11/11/1998 11/11/1998 End Date 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 12/10/2020 12/10/2020 12/10/2020 3/22/2021 Dataset Mean (µg/L)2 73.93 0.51 0.52 0.91 0.43 0.43 1.00 1.00 212.31 0.45 COV 0.57 0.98 1.24 1.50 0.28 0.28 0.00 0.00 0.45 0.58 Mann-Kendall S -62 -75 -29 10 21 21 - - 13 -65 Mann-Kendall Var(S) 332.67 267.67 263.00 220.67 77.00 77.00 - - 44.33 333.67 Mann-Kendall p-value 0.00 0.00 0.04 0.27 0.01 0.01 - - 0.04 0.00 MW-03RC MW-03RD MW-03RB MW-04 OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 2 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE INSUFFICIENT DATA Mann-Kendall Confidence Level 50.0% 50.0% 50.0% 50.0% 50.0% 50.0%64.6% Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 319 0.00 Results in dataset (total) 6 6 6 6 6 6 4 4 6 0 Start Date 12/11/2018 12/11/2018 12/11/2018 12/11/2018 12/11/2018 12/11/2018 12/8/2019 12/8/2019 12/11/2018 1/0/1900 End Date 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 286.00 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 Mann-Kendall S 0 0 0 0 0 0 - - -3 - Mann-Kendall Var(S) 0.00 0.00 0.00 0.00 0.00 0.00 - - 28.33 - Mann-Kendall p-value 0.50 0.50 0.50 0.50 0.50 0.50 - - 0.35 - Trend1 DECREASING NO TREND, >50% ND NO TREND, >50% ND PROBABLY INCREASING, >50% ND INCREASING, >50% ND INCREASING, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE DECREASING Mann-Kendall Confidence Level 99.7% 76.9% 72.8% 94.9% 98.9% 98.9%50.0% 99.0% Max Concentration (µg/L)2 5 5 5 2.5 0.5 0.5 1 1 187 0.01 Results in dataset (total) 13 13 13 12 10 10 4 4 7 10 Start Date 1/6/2000 1/6/2000 1/6/2000 2/23/2005 4/26/2016 4/26/2016 12/6/2019 12/6/2019 1/6/2000 2/23/2005 End Date 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 12/10/2020 12/10/2020 12/10/2020 3/22/2021 Dataset Mean (µg/L)2 0.88 0.90 0.91 0.58 0.43 0.43 1.00 1.00 141.15 0.00 COV 1.56 1.53 1.51 1.07 0.28 0.28 0.00 0.00 0.45 0.75 Mann-Kendall S -46 12 10 22 21 21 - - -1 -27 Mann-Kendall Var(S) 266.67 223.33 220.67 164.67 77.00 77.00 - - 44.33 123.00 Mann-Kendall p-value 0.00 0.23 0.27 0.05 0.01 0.01 - - 0.50 0.01 Trend1 PROBABLY DECREASING PROBABLY DECREASING STABLE STABLE STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND PROBABLY DECREASING Mann-Kendall Confidence Level 93.3% 93.3% 62.1% 85.6% 50.0% 50.0%64.6% 93.3% Max Concentration (µg/L)2 68 0.48 0.5 0.5 0.5 0.5 1 1 462 0.42 Results in dataset (total) 7 7 7 7 7 7 4 4 6 7 Start Date 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/8/2019 12/8/2019 12/27/2018 12/27/2018 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 12/9/2020 12/9/2020 12/9/2020 3/17/2021 Dataset Mean (µg/L)2 59.29 0.42 0.24 0.28 0.50 0.50 1.00 1.00 397.00 0.36 COV 0.10 0.09 0.49 0.55 0.00 0.00 0.00 0.00 0.09 0.10 Mann-Kendall S -11 -11 -3 -8 0 0 - - 3 -11 Mann-Kendall Var(S) 44.33 44.33 42.33 43.33 0.00 0.00 - - 28.33 44.33 Mann-Kendall p-value 0.07 0.07 0.38 0.14 0.50 0.50 - - 0.35 0.07 MW-05R MW-06 MW-08A OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 3 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 DECREASING STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA INCREASING DECREASING Mann-Kendall Confidence Level 96.4% 50.0% 50.0% 50.0% 50.0% 50.0%98.7% 96.4% Max Concentration (µg/L)2 5.5 0.5 0.5 0.5 0.5 0.5 1 1 165 0.03 Results in dataset (total) 7 7 7 7 7 7 4 4 6 7 Start Date 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/27/2018 12/8/2019 12/8/2019 12/27/2018 12/27/2018 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 12/9/2020 12/9/2020 12/9/2020 3/17/2021 Dataset Mean (µg/L)2 4.70 0.50 0.50 0.50 0.50 0.50 1.00 1.00 121.50 0.03 COV 0.12 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.12 Mann-Kendall S -13 0 0 0 0 0 - - 12 -13 Mann-Kendall Var(S) 44.33 0.00 0.00 0.00 0.00 0.00 - - 24.67 44.33 Mann-Kendall p-value 0.04 0.50 0.50 0.50 0.50 0.50 - - 0.01 0.04 Trend1 STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level 50.0% 50.0% 50.0% 50.0% 50.0% 50.0% Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 70.6 0.01 Results in dataset (total) 6 6 6 6 6 6 4 4 5 3 Start Date 3/20/2019 3/20/2019 3/20/2019 3/20/2019 3/20/2019 3/20/2019 12/8/2019 12/8/2019 3/20/2019 12/8/2019 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 12/9/2020 12/9/2020 12/9/2020 9/27/2020 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 0.69 0.86 51.70 0.01 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.53 0.33 0.31 0.12 Mann-Kendall S 0 0 0 0 0 0 - - - - Mann-Kendall Var(S) 0.00 0.00 0.00 0.00 0.00 0.00 - - - - Mann-Kendall p-value 0.50 0.50 0.50 0.50 0.50 0.50 - - - - Trend1 STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE INSUFFICIENT DATA Mann-Kendall Confidence Level 50.0% 50.0% 50.0% 50.0% 50.0% 50.0%50.0% Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 294 0.00 Results in dataset (total) 8 8 8 8 8 8 4 4 7 0 Start Date 9/24/2018 9/24/2018 9/24/2018 9/24/2018 9/24/2018 9/24/2018 12/6/2019 12/6/2019 9/24/2018 1/0/1900 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 12/9/2020 12/9/2020 12/9/2020 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 210.00 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.18 Mann-Kendall S 0 0 0 0 0 0 - - -1 - Mann-Kendall Var(S) 0.00 0.00 0.00 0.00 0.00 0.00 - - 44.33 - Mann-Kendall p-value 0.50 0.50 0.50 0.50 0.50 0.50 - - 0.50 - MW-08B MW-08C MW-12D OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 4 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 2.2 0.5 0.5 0.5 0.5 0.5 1 1 281 0.02 Results in dataset (total) 5 5 5 5 5 5 2 2 5 5 Start Date 9/24/2018 9/24/2018 9/24/2018 9/24/2018 9/24/2018 9/24/2018 12/6/2019 12/6/2019 9/24/2018 9/24/2018 End Date 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 Dataset Mean (µg/L)2 1.37 0.37 0.50 0.50 0.50 0.50 1.00 1.00 189.60 0.01 COV 0.37 0.47 0.00 0.00 0.00 0.00 0.00 0.00 0.44 0.43 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 STABLE STABLE DECREASING DECREASING STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND PROBABLY DECREASING Mann-Kendall Confidence Level 89.4% 69.1% 98.4% 96.8% 50.0% 50.0%81.6% 91.3% Max Concentration (µg/L)2 75 0.6 0.42 0.28 0.5 0.5 1 1 222 0.46 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/17/2018 9/17/2018 9/17/2018 9/17/2018 9/17/2018 9/17/2018 12/5/2019 12/5/2019 9/17/2018 9/17/2018 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 12/11/2020 12/11/2020 12/11/2020 3/21/2021 Dataset Mean (µg/L)2 62.63 0.51 0.35 0.21 0.50 0.50 1.00 1.00 206.71 0.39 COV 0.12 0.10 0.16 0.22 0.00 0.00 0.00 0.00 0.05 0.12 Mann-Kendall S -11 -5 -18 -16 0 0 - - 7 -12 Mann-Kendall Var(S) 64.33 64.33 63.33 65.33 0.00 0.00 - - 44.33 65.33 Mann-Kendall p-value 0.11 0.31 0.02 0.03 0.50 0.50 - - 0.18 0.09 Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 51 0.29 0.5 0.18 0.5 0.5 1 1 182 0.32 Results in dataset (total) 2 2 2 2 2 2 1 1 1 2 Start Date 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 3/22/2021 3/22/2021 3/22/2021 12/16/2020 End Date 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 Dataset Mean (µg/L)2 33.50 0.23 0.46 0.18 0.50 0.50 1.00 1.00 182.00 0.21 COV 0.74 0.37 0.14 0.04 0.00 0.00 0.72 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-13D MW-13L MW-12S OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 5 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 NO TREND INCREASING NO TREND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE NO TREND Mann-Kendall Confidence Level 73.2% 97.7% 77.6% 50.0% 50.0% 50.0%50.0% 73.2% Max Concentration (µg/L)2 31 1.3 0.5 0.5 0.5 0.5 1 1 429 0.19 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/19/2018 9/19/2018 9/19/2018 9/19/2018 9/19/2018 9/19/2018 12/5/2019 12/5/2019 9/19/2018 9/19/2018 End Date 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 3/22/2021 12/11/2020 12/11/2020 12/11/2020 3/22/2021 Dataset Mean (µg/L)2 23.00 0.80 0.26 0.50 0.50 0.50 1.00 1.00 406.57 0.15 COV 0.23 0.45 0.59 0.00 0.00 0.00 0.00 0.00 0.06 0.23 Mann-Kendall S 6 17 7 0 0 0 - - 0 6 Mann-Kendall Var(S) 65.33 64.33 62.33 0.00 0.00 0.00 - - 43.33 65.33 Mann-Kendall p-value 0.27 0.02 0.22 0.50 0.50 0.50 - - 0.50 0.27 Trend1 STABLE NO TREND STABLE STABLE STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND STABLE Mann-Kendall Confidence Level 69.1% 50.0% 89.4% 74.0% 50.0% 50.0%56.0% 73.2% Max Concentration (µg/L)2 37 0.32 0.35 0.22 0.5 0.5 1 1 213 0.23 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/19/2018 9/19/2018 9/19/2018 9/19/2018 9/19/2018 9/19/2018 12/7/2019 12/7/2019 9/19/2018 9/19/2018 End Date 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 12/14/2020 12/14/2020 12/14/2020 3/18/2021 Dataset Mean (µg/L)2 31.00 0.25 0.30 0.18 0.50 0.50 1.00 1.00 203.14 0.19 COV 0.16 0.16 0.13 0.21 0.00 0.00 0.00 0.00 0.05 0.16 Mann-Kendall S -5 1 -11 -6 0 0 - - 2 -6 Mann-Kendall Var(S) 64.33 64.33 64.33 60.67 0.00 0.00 - - 43.33 65.33 Mann-Kendall p-value 0.31 0.50 0.11 0.26 0.50 0.50 - - 0.44 0.27 Trend1 NO TREND PROBABLY INCREASING PROBABLY INCREASING STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND NO TREND Mann-Kendall Confidence Level 73.2% 93.3% 91.3% 50.0% 50.0% 50.0%50.0% 73.2% Max Concentration (µg/L)2 10 12 3.2 0.5 0.5 0.5 1 1 364 0.15 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/19/2018 9/19/2018 9/19/2018 9/19/2018 9/19/2018 9/19/2018 12/7/2019 12/7/2019 9/19/2018 9/19/2018 End Date 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 12/14/2020 12/14/2020 12/14/2020 3/18/2021 Dataset Mean (µg/L)2 4.93 5.35 1.41 0.50 0.46 0.50 1.00 1.00 277.71 0.08 COV 0.61 0.61 0.61 0.00 0.23 0.00 0.00 0.00 0.16 0.50 Mann-Kendall S 6 13 12 0 0 0 - - 1 6 Mann-Kendall Var(S) 65.33 64.33 65.33 0.00 0.00 0.00 - - 44.33 65.33 Mann-Kendall p-value 0.27 0.07 0.09 0.50 0.50 0.50 - - 0.50 0.27 MW-13S MW-14D MW-14S OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 6 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 PROBABLY DECREASING, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA PROBABLY INCREASING INSUFFICIENT DATA Mann-Kendall Confidence Level 90.6% 50.0% 50.0% 50.0% 50.0% 50.0%91.4% Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 380 0.00 Results in dataset (total) 8 8 8 8 8 8 4 4 7 2 Start Date 9/25/2018 9/25/2018 9/25/2018 9/25/2018 9/25/2018 9/25/2018 12/7/2019 12/7/2019 9/25/2018 9/28/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 12/9/2020 12/9/2020 12/9/2020 3/16/2021 Dataset Mean (µg/L)2 0.41 0.50 0.50 0.50 0.50 0.50 1.00 1.00 317.43 0.00 COV 0.39 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.05 Mann-Kendall S -9 0 0 0 0 0 - - 10 - Mann-Kendall Var(S) 37.00 0.00 0.00 0.00 0.00 0.00 - - 43.33 - Mann-Kendall p-value 0.09 0.50 0.50 0.50 0.50 0.50 - - 0.09 - Trend1 NO TREND NO TREND, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE NO TREND Mann-Kendall Confidence Level 87.1% 66.9% 66.9% 50.0% 50.0% 50.0%61.8% 57.6% Max Concentration (µg/L)2 3.3 4.2 0.68 0.5 0.5 0.5 1 1 451 0.06 Results in dataset (total) 8 8 8 8 8 8 4 4 7 6 Start Date 9/25/2018 9/25/2018 9/25/2018 9/25/2018 9/25/2018 9/25/2018 12/7/2019 12/7/2019 9/25/2018 3/11/2019 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 12/9/2020 12/9/2020 12/9/2020 3/16/2021 Dataset Mean (µg/L)2 0.76 0.96 0.52 0.50 0.50 0.50 1.00 1.00 392.71 0.01 COV 1.37 1.36 0.12 0.00 0.00 0.00 0.00 0.00 0.15 2.01 Mann-Kendall S -10 -3 -3 0 0 0 - - -3 -2 Mann-Kendall Var(S) 63.33 21.00 21.00 0.00 0.00 0.00 - - 44.33 27.33 Mann-Kendall p-value 0.13 0.33 0.33 0.50 0.50 0.50 - - 0.38 0.42 Trend1 STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE INSUFFICIENT DATA Mann-Kendall Confidence Level 50.0% 50.0% 50.0% 50.0% 50.0% 50.0%56.0% Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 143 0.00 Results in dataset (total) 8 8 8 8 8 8 4 4 7 0 Start Date 9/20/2018 9/20/2018 9/20/2018 9/20/2018 9/20/2018 9/20/2018 12/6/2019 12/6/2019 9/20/2018 1/0/1900 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 12/10/2020 12/10/2020 12/10/2020 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 107.37 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.15 Mann-Kendall S 0 0 0 0 0 0 - - -2 - Mann-Kendall Var(S) 0.00 0.00 0.00 0.00 0.00 0.00 - - 43.33 - Mann-Kendall p-value 0.50 0.50 0.50 0.50 0.50 0.50 - - 0.44 - MW-16D MW-15D MW-15S OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 7 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 NO TREND NO TREND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND NO TREND Mann-Kendall Confidence Level 64.7% 84.1% 55.7% 56.6% 50.0% 50.0%61.8% 69.1% Max Concentration (µg/L)2 28 0.24 0.5 0.5 0.5 0.5 1 1 263 0.17 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/20/2018 9/20/2018 9/20/2018 9/20/2018 9/20/2018 9/20/2018 12/6/2019 12/6/2019 9/20/2018 9/20/2018 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 12/10/2020 12/10/2020 12/10/2020 3/17/2021 Dataset Mean (µg/L)2 24.25 0.19 0.36 0.40 0.50 0.50 1.00 1.00 250.71 0.15 COV 0.10 0.16 0.54 0.45 0.00 0.00 0.00 0.00 0.04 0.11 Mann-Kendall S 4 9 -2 -2 0 0 - - 3 5 Mann-Kendall Var(S) 63.33 64.33 48.67 36.00 0.00 0.00 - - 44.33 64.33 Mann-Kendall p-value 0.35 0.16 0.44 0.43 0.50 0.50 - - 0.38 0.31 Trend1 NO TREND PROBABLY DECREASING, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE NO TREND Mann-Kendall Confidence Level 80.7% 90.5% 50.0% 50.0% 50.0% 50.0%81.6% 80.7% Max Concentration (µg/L)2 2.8 0.5 0.5 0.5 0.5 0.5 1 1 292 0.02 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/24/2018 9/24/2018 9/24/2018 9/24/2018 9/24/2018 9/24/2018 12/8/2019 12/8/2019 9/24/2018 9/24/2018 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 12/13/2020 12/13/2020 12/13/2020 3/19/2021 Dataset Mean (µg/L)2 2.33 0.45 0.50 0.50 0.50 0.50 1.00 1.00 265.71 0.01 COV 0.15 0.31 0.00 0.00 0.00 0.00 0.00 0.00 0.06 0.16 Mann-Kendall S 8 -7 0 0 0 0 - - -7 8 Mann-Kendall Var(S) 65.33 21.00 0.00 0.00 0.00 0.00 - - 44.33 65.33 Mann-Kendall p-value 0.19 0.10 0.50 0.50 0.50 0.50 - - 0.18 0.19 Trend1 INCREASING STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE INCREASING Mann-Kendall Confidence Level 96.8% 50.0% 50.0% 50.0% 50.0% 50.0%82.2% 96.8% Max Concentration (µg/L)2 0.91 0.5 0.5 0.5 0.5 0.5 1 1 371 0.01 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/24/2018 9/24/2018 9/24/2018 9/24/2018 9/24/2018 9/24/2018 12/8/2019 12/8/2019 9/24/2018 9/24/2018 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 12/11/2020 12/11/2020 12/11/2020 3/19/2021 Dataset Mean (µg/L)2 0.68 0.50 0.50 0.50 0.50 0.50 1.00 1.00 346.71 0.00 COV 0.30 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.08 0.30 Mann-Kendall S 16 0 0 0 0 0 - - -7 16 Mann-Kendall Var(S) 65.33 0.00 0.00 0.00 0.00 0.00 - - 42.33 65.33 Mann-Kendall p-value 0.03 0.50 0.50 0.50 0.50 0.50 - - 0.18 0.03 MW-16S MW-17D MW-17S OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 8 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 DECREASING DECREASING PROBABLY DECREASING PROBABLY DECREASING STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND DECREASING Mann-Kendall Confidence Level 99.5% 99.4% 94.9% 91.3% 50.0% 50.0%88.5% 99.5% Max Concentration (µg/L)2 96 0.65 0.27 0.5 0.5 0.5 1 1 392 0.59 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/18/2018 9/18/2018 9/18/2018 9/18/2018 9/18/2018 9/18/2018 12/5/2019 12/5/2019 9/18/2018 9/18/2018 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 12/14/2020 12/14/2020 12/14/2020 3/21/2021 Dataset Mean (µg/L)2 72.63 0.49 0.23 0.25 0.50 0.50 1.00 1.00 357.29 0.45 COV 0.19 0.15 0.20 0.46 0.00 0.00 0.00 0.00 0.06 0.19 Mann-Kendall S -22 -21 -14 -12 0 0 - - 9 -22 Mann-Kendall Var(S) 65.33 64.33 63.33 65.33 0.00 0.00 - - 44.33 65.33 Mann-Kendall p-value 0.00 0.01 0.05 0.09 0.50 0.50 - - 0.11 0.00 Trend1 DECREASING DECREASING STABLE STABLE STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND DECREASING Mann-Kendall Confidence Level 99.8% 99.4% 87.6% 55.0% 50.0% 50.0%72.6% 99.5% Max Concentration (µg/L)2 89 0.68 0.31 0.5 0.5 0.5 1 1 335 0.55 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/18/2018 9/18/2018 9/18/2018 9/18/2018 9/18/2018 9/18/2018 12/5/2019 12/5/2019 9/18/2018 9/18/2018 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 12/14/2020 12/14/2020 12/14/2020 3/21/2021 Dataset Mean (µg/L)2 64.50 0.52 0.26 0.25 0.50 0.50 1.00 1.00 317.00 0.40 COV 0.19 0.15 0.17 0.42 0.00 0.00 0.00 0.00 0.05 0.19 Mann-Kendall S -24 -21 -10 -2 0 0 - - 5 -22 Mann-Kendall Var(S) 63.33 64.33 60.67 63.33 0.00 0.00 - - 44.33 65.33 Mann-Kendall p-value 0.00 0.01 0.12 0.45 0.50 0.50 - - 0.27 0.00 Trend1 STABLE STABLE STABLE STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA NO TREND DECREASING Mann-Kendall Confidence Level 87.1% 87.6% 65.3% 50.0% 50.0% 50.0%50.0% 96.0% Max Concentration (µg/L)2 12 0.29 0.5 0.5 0.5 0.5 1 1 137 0.08 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/19/2018 9/19/2018 9/19/2018 9/19/2018 9/19/2018 9/19/2018 12/5/2019 12/5/2019 9/19/2018 9/19/2018 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 12/15/2020 12/15/2020 12/15/2020 3/19/2021 Dataset Mean (µg/L)2 10.60 0.26 0.18 0.50 0.50 0.50 1.00 1.00 119.14 0.07 COV 0.10 0.10 0.71 0.00 0.00 0.00 0.00 0.00 0.08 0.10 Mann-Kendall S -10 -10 -4 0 0 0 - - 1 -15 Mann-Kendall Var(S) 63.33 60.67 58.00 0.00 0.00 0.00 - - 44.33 64.33 Mann-Kendall p-value 0.13 0.12 0.35 0.50 0.50 0.50 - - 0.50 0.04 MW-19 MW-20D MW-18 OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 9 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 NO TREND STABLE NO TREND, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE STABLE Mann-Kendall Confidence Level 54.9% 50.0% 80.9% 50.0% 50.0% 50.0%50.0% 50.0% Max Concentration (µg/L)2 5.4 0.5 0.5 0.5 0.5 0.5 1 1 115 0.03 Results in dataset (total) 8 8 8 8 8 8 4 4 7 8 Start Date 9/18/2018 9/18/2018 9/18/2018 9/18/2018 9/18/2018 9/18/2018 12/4/2019 12/4/2019 9/18/2018 9/18/2018 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 12/14/2020 12/14/2020 12/14/2020 3/19/2021 Dataset Mean (µg/L)2 4.54 0.22 0.45 0.50 0.50 0.50 1.00 1.00 109.29 0.03 COV 0.13 0.80 0.29 0.00 0.00 0.00 0.00 0.00 0.03 0.13 Mann-Kendall S 2 -1 5 0 0 0 - - -1 0 Mann-Kendall Var(S) 65.33 62.33 21.00 0.00 0.00 0.00 - - 42.33 65.33 Mann-Kendall p-value 0.45 0.50 0.19 0.50 0.50 0.50 - - 0.50 0.50 Trend1 PROBABLY DECREASING STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE PROBABLY DECREASING Mann-Kendall Confidence Level 91.4% 50.0% 50.0% 50.0% 50.0% 50.0%50.0% 91.4% Max Concentration (µg/L)2 2 0.5 0.5 0.5 0.5 0.5 1 1 424 0.01 Results in dataset (total) 7 7 7 7 7 7 3 3 6 7 Start Date 9/20/2018 9/20/2018 9/20/2018 9/20/2018 9/20/2018 9/20/2018 6/18/2020 6/18/2020 9/20/2018 9/20/2018 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 12/14/2020 12/14/2020 12/14/2020 3/16/2021 Dataset Mean (µg/L)2 1.66 0.50 0.50 0.50 0.50 0.50 1.00 1.00 360.83 0.01 COV 0.22 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.22 Mann-Kendall S -10 0 0 0 0 0 - - -1 -10 Mann-Kendall Var(S) 43.33 0.00 0.00 0.00 0.00 0.00 - - 28.33 43.33 Mann-Kendall p-value 0.09 0.50 0.50 0.50 0.50 0.50 - - 0.50 0.09 Trend1 STABLE NO TREND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND STABLE, >50% ND INSUFFICIENT DATA INSUFFICIENT DATA STABLE STABLE Mann-Kendall Confidence Level 86.4% 83.0% 50.0% 50.0% 50.0% 50.0%87.0% 85.6% Max Concentration (µg/L)2 3.5 0.5 0.5 0.5 0.5 0.5 1 1 294 0.02 Results in dataset (total) 7 7 7 7 7 7 3 3 6 7 Start Date 9/20/2018 9/20/2018 9/20/2018 9/20/2018 9/20/2018 9/20/2018 6/17/2020 6/17/2020 9/20/2018 9/20/2018 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 12/14/2020 12/14/2020 12/14/2020 3/21/2021 Dataset Mean (µg/L)2 2.94 0.28 0.50 0.50 0.50 0.50 1.00 1.00 284.67 0.02 COV 0.11 0.73 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.12 Mann-Kendall S -8 7 0 0 0 0 - - -7 -8 Mann-Kendall Var(S) 40.67 39.67 0.00 0.00 0.00 0.00 - - 28.33 43.33 Mann-Kendall p-value 0.14 0.17 0.50 0.50 0.50 0.50 - - 0.13 0.14 MW-20S MW-21 MW-22 OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 10 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 2.7 4.5 329 0.25 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 10/19/2020 10/19/2020 10/19/2020 10/19/2020 10/19/2020 10/19/2020 10/19/2020 10/19/2020 10/19/2020 10/19/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 Dataset Mean (µg/L)2 0.50 0.37 0.50 0.50 0.50 0.50 1.45 1.85 320.00 0.11 COV 0.00 0.61 0.00 0.00 0.00 0.00 0.74 1.24 0.02 1.01 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 208 0.02 Results in dataset (total) 3 3 3 3 3 3 3 3 3 2 Start Date 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 12/10/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 0.61 1.00 192.33 0.01 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.57 0.00 0.07 0.34 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 14 4.5 63.4 0.61 Results in dataset (total) 4 4 4 4 4 4 4 4 4 4 Start Date 6/23/2020 6/23/2020 6/23/2020 6/23/2020 6/23/2020 6/23/2020 6/23/2020 6/23/2020 6/23/2020 6/23/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 4.62 2.16 60.13 0.24 COV 0.00 0.00 0.00 0.00 0.00 0.00 1.36 0.94 0.07 1.08 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-23C MW-23A MW-23B OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 11 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 346 0.00 Results in dataset (total) 3 3 3 3 3 3 3 3 3 1 Start Date 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 10/20/2020 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 10/20/2020 Dataset Mean (µg/L)2 0.42 0.50 0.50 0.50 0.50 0.50 1.00 1.00 323.00 0.00 COV 0.35 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 1.6 0.5 0.5 0.5 0.5 0.5 1 1 333 0.01 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 Dataset Mean (µg/L)2 1.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 320.67 0.01 COV 0.12 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.04 0.12 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 198 0.01 Results in dataset (total) 3 3 3 3 3 3 3 3 3 1 Start Date 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 9/30/2020 3/21/2021 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 0.78 1.00 189.33 0.01 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.50 0.00 0.04 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-24 MW-25A MW-25B OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 12 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 1.1 0.5 0.5 0.5 0.5 0.5 1 1 90.4 0.03 Results in dataset (total) 4 4 4 4 4 4 4 4 4 4 Start Date 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 6/19/2020 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 Dataset Mean (µg/L)2 0.92 0.50 0.50 0.50 0.50 0.50 0.72 0.85 85.20 0.03 COV 0.16 0.00 0.00 0.00 0.00 0.00 0.30 0.36 0.07 0.21 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level 96.0% 96.0% 96.0% 96.0% 96.0% 96.0% 96.0% 96.0% 96.0% Max Concentration (µg/L)2 0.5 0.21 0.5 0.5 0.5 0.5 1 1 402 0.00 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 Dataset Mean (µg/L)2 0.50 0.18 0.50 0.50 0.50 0.50 1.00 1.00 374.33 0.00 COV 0.00 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.20 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) 21.00 21.00 21.00 21.00 21.00 21.00 21.00 21.00 - 21.00 Mann-Kendall p-value 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 - 0.04 Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 211 0.00 Results in dataset (total) 3 3 3 3 3 3 2 2 2 0 Start Date 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 12/16/2020 12/16/2020 12/16/2020 1/0/1900 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 200.00 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.08 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-26A MW-26B MW-25C OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 13 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.79 0.5 0.5 0.5 0.5 0.5 1 1 81.2 0.00 Results in dataset (total) 2 2 2 2 2 2 1 1 1 2 Start Date 12/17/2020 12/17/2020 12/17/2020 12/17/2020 12/17/2020 12/17/2020 3/18/2021 3/18/2021 3/18/2021 12/17/2020 End Date 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 Dataset Mean (µg/L)2 0.60 0.50 0.50 0.50 0.50 0.50 1.00 1.00 81.20 0.00 COV 0.46 0.00 0.00 0.00 0.00 0.00 0.46 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 59.3 0.00 Results in dataset (total) 2 2 2 2 2 2 1 1 1 0 Start Date 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 9/25/2020 3/18/2021 3/18/2021 3/18/2021 1/0/1900 End Date 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 59.30 COV 0.00 0.00 0.00 0.00 0.00 0.00 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.15 0.5 0.5 0.5 0.5 1 1 459 0.00 Results in dataset (total) 4 4 4 4 4 4 4 4 4 4 Start Date 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 Dataset Mean (µg/L)2 0.50 0.13 0.50 0.50 0.50 0.50 1.00 1.00 368.50 0.00 COV 0.00 0.15 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.15 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-26C MW-26D MW-27 OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 14 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.24 0.5 0.5 0.5 0.5 1 1 455 0.00 Results in dataset (total) 4 4 4 4 4 4 4 4 4 4 Start Date 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 6/24/2020 End Date 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 3/21/2021 Dataset Mean (µg/L)2 0.50 0.19 0.50 0.50 0.50 0.50 1.00 1.00 407.50 0.00 COV 0.00 0.17 0.00 0.00 0.00 0.00 0.00 0.00 0.09 0.17 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 11 0.18 0.5 0.5 0.5 0.5 1 1 235 0.07 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 Dataset Mean (µg/L)2 10.53 0.17 0.50 0.50 0.50 0.50 1.00 1.00 211.00 0.06 COV 0.08 0.06 0.00 0.00 0.00 0.00 0.00 0.00 0.10 0.07 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level 96.0% 96.0% 96.0% 96.0% 96.0% 96.0% 96.0% 96.0% 96.0% Max Concentration (µg/L)2 0.56 0.5 0.5 0.5 0.5 0.5 1 1 372 0.02 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 Dataset Mean (µg/L)2 0.53 0.50 0.50 0.25 0.50 0.50 1.00 0.79 260.67 0.01 COV 0.09 0.00 0.00 0.89 0.00 0.00 0.00 0.46 0.37 0.81 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) 21.00 21.00 21.00 21.00 21.00 21.00 21.00 21.00 - 21.00 Mann-Kendall p-value 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 - 0.04 MW-28 MW-29A MW-29B OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 15 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 170 0.00 Results in dataset (total) 3 3 3 3 3 3 3 3 3 0 Start Date 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 9/28/2020 1/0/1900 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 153.33 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.4 0.5 0.5 0.5 0.5 0.5 0.65 1 324 0.05 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/21/2020 9/21/2020 9/21/2020 9/21/2020 9/21/2020 9/21/2020 9/21/2020 9/21/2020 9/21/2020 9/21/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 Dataset Mean (µg/L)2 0.37 0.50 0.50 0.50 0.50 0.50 0.55 0.92 280.33 0.03 COV 0.08 0.00 0.00 0.00 0.00 0.00 0.19 0.15 0.14 0.51 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.18 0.34 0.5 0.5 0.5 0.5 1 1 352 0.00 Results in dataset (total) 2 2 2 2 2 2 2 2 2 2 Start Date 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 Dataset Mean (µg/L)2 0.18 0.32 0.50 0.50 0.50 0.50 1.00 1.00 326.50 0.00 COV 0.00 0.11 0.00 0.00 0.00 0.00 0.00 0.00 0.11 0.08 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-30RA MW-29C MW-30C OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 16 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.19 0.5 0.5 0.5 0.5 1 1 350 0.00 Results in dataset (total) 2 2 2 2 2 2 2 2 2 2 Start Date 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 12/8/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 Dataset Mean (µg/L)2 0.50 0.19 0.50 0.50 0.50 0.50 1.00 1.00 313.00 0.00 COV 0.00 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.17 0.04 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.73 0.5 0.5 0.5 0.5 0.5 1 1 190 0.00 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 End Date 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 Dataset Mean (µg/L)2 0.61 0.50 0.50 0.50 0.50 0.50 1.00 1.00 166.67 0.00 COV 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.12 0.18 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 142 0.00 Results in dataset (total) 3 3 3 3 3 3 3 3 3 0 Start Date 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 1/0/1900 End Date 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 131.67 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-30RB MW-31A MW-31B OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 17 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1.5 8.8 85.5 0.35 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 9/23/2020 End Date 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.03 4.80 84.53 0.20 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.44 0.72 0.02 0.66 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.64 0.5 0.5 0.5 0.5 0.5 1 1 247 0.00 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 Dataset Mean (µg/L)2 0.51 0.50 0.50 0.50 0.50 0.50 1.00 1.00 218.33 0.00 COV 0.21 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.12 0.21 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.44 0.5 0.5 0.5 0.5 0.5 1 1 106 0.00 Results in dataset (total) 3 3 3 3 3 3 3 3 3 3 Start Date 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 Dataset Mean (µg/L)2 0.37 0.50 0.50 0.50 0.50 0.50 1.00 1.00 102.67 0.00 COV 0.18 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.18 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-32A MW-32B MW-31C OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 18 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 66.1 0.02 Results in dataset (total) 3 3 3 3 3 3 3 3 3 2 Start Date 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 9/22/2020 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 12/10/2020 Dataset Mean (µg/L)2 0.42 0.50 0.50 0.50 0.50 0.50 0.89 1.00 62.27 0.01 COV 0.33 0.00 0.00 0.00 0.00 0.00 0.21 0.00 0.06 1.24 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 36 0.66 0.5 0.5 0.5 0.5 1 1 171 0.22 Results in dataset (total) 3 3 3 3 3 3 2 2 2 3 Start Date 10/1/2020 10/1/2020 10/1/2020 10/1/2020 10/1/2020 10/1/2020 12/15/2020 12/15/2020 12/15/2020 10/1/2020 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 Dataset Mean (µg/L)2 23.23 0.48 0.35 0.50 0.50 0.50 1.00 1.00 164.00 0.15 COV 0.74 0.56 0.38 0.00 0.00 0.00 0.00 0.00 0.06 0.74 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 16 0.49 0.5 0.5 0.5 0.5 1 2.9 154 0.21 Results in dataset (total) 3 3 3 3 3 3 2 2 2 3 Start Date 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 Dataset Mean (µg/L)2 11.93 0.43 0.45 0.50 0.50 0.50 0.79 1.95 143.00 0.12 COV 0.45 0.12 0.17 0.00 0.00 0.00 0.39 0.69 0.11 0.70 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-32C MW-34A MW-34B OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 19 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 39.3 0.02 Results in dataset (total) 3 3 3 3 3 3 2 2 2 1 Start Date 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 9/27/2020 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 0.87 35.00 0.02 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.22 0.17 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 48.2 0.03 Results in dataset (total) 3 3 3 3 3 3 3 3 3 2 Start Date 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 9/27/2020 12/13/2020 End Date 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 3/19/2021 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 0.74 1.00 46.90 0.02 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.47 0.00 0.04 0.61 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 225 0.00 Results in dataset (total) 2 2 2 2 2 2 2 2 2 1 Start Date 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 End Date 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 3/16/2021 12/14/2020 Dataset Mean (µg/L)2 0.39 0.50 0.50 0.50 0.50 0.50 1.00 1.00 205.50 0.00 COV 0.40 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-34C MW-34D MW-36 OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 20 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 295 0 Results in dataset (total) 2 2 2 2 2 2 2 2 2 0 Start Date 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 1/0/1900 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 283.50 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 451 0 Results in dataset (total) 2 2 2 2 2 2 2 2 2 0 Start Date 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 12/14/2020 1/0/1900 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 405.50 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.16 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 173 0 Results in dataset (total) 2 2 2 2 2 2 2 2 2 0 Start Date 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 1/0/1900 End Date 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 3/18/2021 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 164.50 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.07 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - MW-37D MW-37S MW-38D OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 21 of 22 Appendix G Contaminant Persistence Supporting Information COC PCE TCE cis-1,2-DCE 1,1-DCE trans-1,2-DCE Vinyl Chloride Ethene Ethane Chloride (mg/L) Total Molar Concentration (µmol/L) Well Trend1 INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA INSUFFICIENT DATA Mann-Kendall Confidence Level Max Concentration (µg/L)2 0.5 0.5 0.5 0.5 0.5 0.5 1 1 257 0 Results in dataset (total) 2 2 2 2 2 2 2 2 2 0 Start Date 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 12/16/2020 1/0/1900 End Date 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 3/17/2021 1/0/1900 Dataset Mean (µg/L)2 0.50 0.50 0.50 0.50 0.50 0.50 1.00 1.00 246.00 COV 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.06 Mann-Kendall S - - - - - - - - - - Mann-Kendall Var(S) - - - - - - - - - - Mann-Kendall p-value - - - - - - - - - - Abbreviations 1,1-DCE - 1,1-Dichloroethene mg/L - milligrams per liter µg/L - microgram per liter MK - Mann-Kendall µmol/L - micromole per liter ND - non-detect cis-1,2-DCE - Cis-1,2-Dichloroethene PCE - Tetrachloroethene COC - chemical of concern p-value - the probability of S COV - coefficient of variation TCE - Trichloroethene Mann-Kendall S - MK test statistic trans-1,2-DCE - Trans-1,2-Dichloroethene MCL - maximum contaminant level Var - variance Notes 1Trend was analyzed with the MK statistical test for datasets containing 6 or more data points. The trend result is based on the Mann-Kendall S, CF, and COV as follows: · Increasing (S greater than 0, CF > 95%) · Probably Increasing (S greater than 0, CF between or equal to 95% and 90%) · No Trend (S greater than 0, CF less than 90%) · Stable (if S is less than or equal to zero and COV less than 1) · Probably Decreasing (S less than 0, CF between or equal to 95% and 90%) · Decreasing (S less than 0, CF greater than 95%) 2Statistical analysis trend results are reported in units of µg/L, except for chloride, where units are mg/L, and total molar concentration, where units are µmol/L. Statistical analysis trends where more than 50% of results were non-detects are in black font. Statistical analysis trends with the majority of the results analyzed above the detection limit are in white font. MW-38S OU1 Remedial Investigation Report 700 South 1600 East PCE Plume Salt Lake City, Utah Page 22 of 22 53.0 49.0 9.1 4.3 1.1 52.0 3.9 0.1 0.1 0.1 MW -18 MW -19 MW -20DMW-20S MW -21MW-08 MW -38D MW -38S 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 4100 4200 4300 4400 4500 4600 4700 4800 A B Le gend PC E_GW+SW_Most_Recent > 5.0 > 10.0 > 5 0.0 GM-DYN Mo del Clay/Silt Laye r PC E _LF < 1 < 5 < 50 < 100 ≥ 100 1400 East Fence Sc ale : 1:3 ,100 V e rt ic al e xag ge rat ion: 1x 0ft 1 0 00ft A : B: 154135 7 , 7 444042 154321 8 , 7 442148 Loca tion 53.049.0 9.1 4.3 1.1 52.0 3.9 0.1 0.1 0.1 MW -18MW-19 MW -20D MW -20SMW-21 MW -08 MW -38D MW -38S 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 4100 4200 4300 4400 4500 4600 4700 4800 A B Le gend PC E_GW+SW_Most_Recent > 5.0 > 10.0 > 5 0.0 GM-DYN Mo del Clay/Silt Laye r PC E _LF < 1 < 5 < 50 < 100 ≥ 100 1400 East Fence Sc ale : 1:3 ,100 V e rt ic al e xag ge rat ion: 1x 0ft 1 0 00ft A : B: 154321 8 , 7 442148 154135 7 , 7 444042 Loca tion 51.0 27.0 0.1 24.0 2.3 0.722.0 43.0 16.0 MW -13D MW -13S MW -16D MW -16S MW -17D MW -17S GW -13 GW -52 MW -13L 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 4100 4200 4300 4400 4500 4600 4700 4800 A B Lege nd PC E _GW+SW_Most_Recent > 5.0 > 10.0 > 5 0 .0 GM-DYN Model Clay/Silt Laye r PC E_LF < 1 < 5 < 5 0 < 100 ≥ 100 Eastside Springs Fence Scale : 1 :3,1 00 V e rt ical e xagge rat io n: 1 x 0 ft 1000 ft A : B: 154 0 9 80, 7443 3 0 4 154 2 3 02, 7441 6 3 0 Location 51.0 27.0 0.1 24.0 2.3 0.7 22.043.0 16.0 MW -13D MW -13S MW -16D MW -16SMW-17D MW -17S GW -13 GW -52 MW -13L 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 4100 4200 4300 4400 4500 4600 4700 4800 A B Lege nd PC E _GW+SW_Most_Recent > 5.0 > 10.0 > 5 0 .0 GM-DYN Model Clay/Silt Laye r PC E_LF < 1 < 5 < 5 0 < 100 ≥ 100 Eastside Springs Fence Scale : 1 :3,1 00 V e rt ical e xagge rat io n: 1 x 0 ft 1000 ft A : B: 154 2 3 02, 7441 6 3 0 154 0 9 80, 7443 3 0 4 Location 29.0 170.0 5.7 0.1 220.0 40.0 0.4 0.5 0.1 0.1 0.2 0.1 MW -03R MW -02 MW -04 MW -31A MW -31B MW -30RAMW-30C MW -31C MW -30RB 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 4100 4200 4300 4400 4500 4600 4700 4800 A B Le gend PC E_GW+SW_Most_Recent > 5.0 > 10 .0 > 50.0 > 100.0 GM-DYN Model Clay/Silt Laye r PC E _LF < 1 < 5 < 50 < 10 0 ≥ 10 0 Guardsman Way Fence Sc ale : 1:3 ,100 V e rt ic al e xag ge rat ion: 1x 0ft 1 0 00ft A : B: 154542 8 , 7 445342 154546 0 , 7 442280 Loca tion 29.0 170.0 5.7 0.1 220.040.0 0.4 0.5 0.1 0.1 0.2 0.1 MW -03RMW-02 MW -04 MW -31A MW -31B MW -30RA MW -30C MW -31C MW -30RB 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 3100 4100 4200 4300 4400 4500 4600 4700 4800 A B Le gend PC E_GW+SW_Most_Recent > 5.0 > 10 .0 > 50.0 > 100.0 GM-DYN Model Clay/Silt Laye r PC E _LF < 1 < 5 < 50 < 10 0 ≥ 10 0 Guardsman Way Fence Sc ale : 1:3 ,100 V e rt ic al e xag ge rat ion: 1x 0ft 1 0 00ft A : B: 154546 0 , 7 442280 154542 8 , 7 445342 Loca tion 55 25 0 23 3 1 1 431 20 51 57 60 6 43 56 MW-13D M W-13S MW-16D MW-16S MW-17D MW-17S GW-05 GW-28 GW-49 GW-62MW-13L RG-02 RG-03 RG-07 RG-08 RG-04 19 20 18 14 1 131220 50 0 59 SW-09 SW-11 SW-14 SW-15SW-25 SW-27 SW-28SW-31 SW-35 SW-41 SW-166 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 4100 4200 4300 4400 4500 4600 4700 4800 Southeast No rthwest Lege nd PC E_GW+SW_Most_Recent GW =RG Filt e re d + Cont rol > 5 .0 > 1 0 .0 > 5 0 .0 PC E _LF < 1 < 5 < 50 < 100 ≥ 100 Aquitard Clay/Silt Laye r Eastside Springs Fence-revised Scale : 1:3 ,10 0 V e rt ic al e xagge rat ion: 1x 0ft 1 000ft So ut he ast : No rt hw e st : 1 5 42233, 7 4 4 1694 1 5 40739, 7 4 4 3066 Location V ie w ing A ngle