The document summarizes a study conducted by an intern for Charleston Waterkeeper to determine if copper-based marine antifouling paints are a significant source of copper contamination in sediments near marinas and boatyards in Charleston Harbor. Samples were collected from 3 marinas/boatyards and a control site and tested for copper concentration. Statistical analysis found significantly higher copper levels in sediments closer to marinas/boatyards, suggesting antifouling paints are a likely source of the contamination. Future recommendations include further studies, monitoring, and promoting alternatives to copper-based paints.

1. Andy Lassiter An Internship with Charleston Waterkeeper

17. Sampling Locations

20. Sampling Categories

32. Charleston Boatyard This figure shows the approximate sample locations and Cu concentration in µg / dry g

33. Coded Data for City Boatyard Sample ID CONC. ( µg/g ) NOAA SQuiRT Levels for Cu CB-01-BP-1 15 <Threshold 0 - 18.6 µg/g CB-02-BP-2 3 TEL 18.7 µg/g CB-03-BP-3 23 ERL 34 µg/g CB-04-LS-1 5 ERM 270 µg/g CB-05-LS-2 6 CB-06-LS-3 45 Average Cu. Conc by Category CB-07-US-1 28 BP / LS US DS CB-08-US-2 18 15 28 3 CB-09-US-3 4 3 18 3 CB-10-US-4 4 23 4 2 CB-11-US-5 3 5 4 3 CB-12-US-6 9 6 3 3 CB-13-DS-1 3 45 9 3 CB-14-DS-2 3 16.2 11.0 2.8 CB-15-DS-3 2 Exceedences 2 1 0 3 CB-16-DS-4 3 CB-17-DS-5 3 CB-18-DS-6 3

36. This figure shows the approximate sample locations and Cu concentration in µg / dry g

37. Sample ID CONC. ( µg/g ) NOAA SQuiRT Levels for Cu CM-01-BP-1 28 <Threshold 0 - 18.6 µg/g CM-02-BP-2 67 TEL 18.7 µg/g CM-03-BP-3 17 ERL 34 µg/g CM-04-LS-1 19 ERM 270 µg/g CM-05-LS-2 7 CM-06-LS-3 3 Average Cu. by Category CM-07-US-1 29 BP / LS US DS CM-08-US-2 12 28 29 11 CM-09-US-3 12 67 12 20 CM-10-US-4 14 17 12 9 CM-11-US-5 27 19 14 3 CM-12-US-6 3 7 27 3 CM-13-DS-1 11 3 3 12 CM-14-DS-2 20 23.5 16.2 9.7 CM-15-DS-3 9 3 2 1 CM-16-DS-4 3 CM-17-DS-5 3 CM-18-DS-6 12

40. This figure shows the approximate sample locations and Cu concentration in µg / dry g.

41. Sample ID CONC. ( µg/g ) NOAA SQuiRT Levels for Cu DC-01-BP-1 19 <Threshold 0 - 18.6 µg/g DC-02-BP-2 395 TEL 18.7 µg/g DC-03-BP-3 31 ERL 34 µg/g DC-04-LS-1 23 ERM 270 µg/g DC-05-LS-2 51 DC-06-LS-3 65 DC-07-US-1 15 Average Cu. by Category DC-08-US-2 45 BP / LS US DS DC-09-US-3 93 19 15 100 DC-10-US-4 346 395 45 254 DC-11-US-5 218 31 93 9 DC-12-US-6 6 23 346 42 DC-13-DS-1 100 51 218 15 DC-14-DS-2 254 65 6 4 DC-15-DS-3 9 97.3 120.5 70.7 DC-16-DS-4 42 6 4 3 DC-17-DS-5 15 DC-18-DS-6 4

44. Control Location NOAA Cu SQuiRT Levels <Threshold 0 - 18.6 µg/g TEL 18.7 µg/g ERL 34 µg/g ERM 270 µg/g # Conc. (ppm) GPS LAT. GPS LONG. TIME Depth (ft.) TIDE C1 3 32 62.915 80 01.334 5:15 7.00 out C2 2 32 62.667 80 00.899 5:15 2.00 out C3 3 32 62.492 80 01.412 5:15 4.00 out C4 3 32 67.389 80 00.662 5:30 6.40 out C5 3 32 67.192 80 00.664 5:30 3.00 out C6 3 32 66.533 80 00.857 5:30 6.00 out

45. Comparisons by Location Shows average BP Concentrations for each site.

54. Special thanks to Charleston Waterkeeper, committee members, and friends who helped with the CHMCS project!