Evaluation of Metals in Fish from Virginia Watersheds in 2017
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Evaluation of Metals in Fish from Virginia Watersheds in 2017 Chowan and James Rivers, Lake Anna, Lake Gordonsville, Motts Run Reservoir, and Potomac River Embayments VIRGINIA Letter Health Consultation May 10, 2019 Virginia Department of Health Division of Environmental Epidemiology 109 Governor Street Richmond, Virginia 23219 1 COMMONWEALTH of VIRGINIA Department of Health – Office of Epidemiology M. Norman Oliver, MD, MA PO BOX 2448 TTY 7-1-1 OR STATE HEALTH COMMISSIONER RICHMOND, VA 1-800-828-1120 May 10, 2019 Gabriel Darkwah Lab Data Coordinator Virginia Department of Environmental Quality 1111 E. Main Street Suite 1400 Richmond, VA 23219 Dear Mr. Darkwah, Thank you for providing metals fish tissue concentrations results for fish collected from Chowan and James Rivers, Lake Anna, Lake Gordonsville, Motts Run Reservoir, and Potomac River Embayments in 2017. The Virginia Department of Health (VDH) has finished reviewing the results for public health implications as requested. BACKGROUND AND RESULTS In October 2000, pursuant to § 32.1-248.01 of the Code of Virginia, VDH published guidelines for issuance of fish consumption advisories due to contamination of fish, including metals. In 2012, VDH updated the guidelines for establishing a fish consumption advisory. These 1 guidelines are available at Virginia Regulatory Town Hall. The current fish consumption guidelines for mercury are as follows: • Average fish tissue concentrations ranging from non-detectable to below 0.5 ppm will not warrant issuance of a fish-eating advisory. • When the average concentrations in fish range from 0.5 to below 1.0 ppm, VDH recommends limiting consumption of contaminated fish to two, 8-oz. meals per month. • When the average concentrations in fish range from 1.0 ppm to below 2.0 ppm, VDH recommends limiting consumption of contaminated fish to one, 8-oz. meal per month. 1 https://law.lis.virginia.gov/vacode/title32.1/chapter6/section32.1-248.01/ 2 • When the average concentrations in fish exceed 2.0 ppm, VDH recommends that contaminated fish should not be consumed. In 2017, the VA Department of Environmental Quality (DEQ) collected fish from watersheds of the upper portions of the James River, three tributaries of the Chowan River, Lake Anna, two impoundments: Lake Gordonsville and Motts Run Reservoir, and embayments along the Potomac River. A total of 143 fish tissue samples (either individual fillets or composites) were analyzed for 17 different metal analytes including: aluminum (Al), antimony (Sb), arsenic (As), barium (Ba), beryllium (Be), cadmium (Cd), chromium (Cr), copper (Cu), lead (Pb), manganese (Mn), nickel (Ni), selenium (Se), silver (Ag), thallium (Tl), vanadium (V), zinc (Zn), and mercury (Hg). A summary of the data, including only fish samples that exceeded VDH’s screening value (SV) for inorganic arsenic or VDH’s lower level of concern for mercury, are located in Table 1. The complete mercury and arsenic concentrations reported in fish from the waterways sampled are in Appendix A. Other fish tissue metal concentrations reported are not presented or discussed in this document. VDH’s current advisories for the watersheds included in this sampling data are in Appendix B. The following summarizes the sampling results, organized by river, for sampling locations where the current fish tissue concentrations of mercury reported exceeded 0.5 parts per million (ppm) or VDH’s SV for inorganic arsenic (0.09 mg/kg for cancer effects, 1.59 mg/kg for non- cancer effects).2 Summary of fish with mercury exceeding VDH’s lower level of concern All fish samples collected from Hardware Creek were below VDH’s lower level of concern for mercury except for one American eel (0.66 ppm). There is a polychlorinated biphenyl (PCB) consumption advisory for this waterway that includes American eel. One flathead catfish (0.77 ppm) and a composite sample of six largemouth bass (0.70 ppm) from the Maury River exceeded VDH’s lower level of concern for mercury. There is a PCB consumption advisory for this river, however, it does not include flathead catfish or largemouth bass. All of the fish collected from the Meherrin River were below VDH’s lower level of concern for mercury except one largemouth bass (0.57 ppm). There is a mercury consumption advisory for this waterway that includes largemouth bass. Fish samples collected from the Nottoway River that exceeded VDH’s lower level of concern for mercury include two blue catfish (0.60 and 1.09 ppm), a composite sample of four bowfin (1.32 ppm), and a composite sample of five largemouth bass (0.61 ppm). There is a mercury consumption advisory for the Nottoway River that includes largemouth bass and bowfin. Samples collected from Motts Run Reservoir, Lake Gordonsville, Emporia Reservoir, and the 2 Dwight D. Flammia, Rebecca LePrell, Matthew F. Skiljo, Egbe Egiebor. Metal Concentration in Fish Tissue: Implications for Public Health Following Coal Ash Release to Dan River. Presented at the 2014 National Fish Forum on Contaminants in Fish. Alexandria, VA. September 2014. 3 Blackwater River exceeded VDH’s lower level of concern for mercury. These water ways have fish consumption advisories for mercury that include fish species that exceeded VDH’s lower level of concern. Table 1: Fish samples with mercury or arsenic concentrations greater than VDH screening values. Site Waterbody Fish Species # Fish in Length Weight (g) Hg # Sample (cm) (ppm) 5 Hardware Creek American Eel 2 51.2 - 51.5 245 - 259 0.66 7 Maury River Largemouth Bass 6 40.4 - 51.9 1045 - 2268 0.70 9 Maury River Flathead Catfish 1 86.1 7000 0.77 20 Motts Run Reservoir Largemouth Bass 1 32.7 465 0.54 20 Motts Run Reservoir Largemouth Bass 3 30.0 - 31.6 353 - 390 0.57 21 Lake Gordonsville Largemouth Bass 1 33.1 479 0.54 27 Emporia Reservoir Largemouth Bass 1 44.2 1107 0.80 28 Meherrin River Largemouth Bass 1 38.7 715 0.57 29 Nottoway River Bowfin 4 56.1 - 59.5 1602 - 1855 0.90 30 Nottoway River Bowfin 3 45.5 - 60.8 904 - 2168 0.63 30 Nottoway River Largemouth Bass 5 40.7 - 45.5 998 - 1219 1.00 31 Nottoway River Bowfin 3 50.9 - 60.9 1238 - 1896 0.80 31 Nottoway River Chain Pickerel 5 38.7 - 48.8 361 - 965 0.51 31 Nottoway River Golden Redhorse 8 48.2 - 56.4 1215 - 1974 0.65 Sucker 31 Nottoway River Largemouth Bass 4 34.3 - 43.6 563 - 1247 0.74 31 Nottoway River Redear Sunfish 7 26.3 - 31.6 379 - 625 0.50 32 Blackwater River Bowfin 4 51.5 - 55.2 1395 - 2405 0.64 32 Blackwater River Chain Pickerel 2 39.6 - 46.6 395 - 711 0.50 32 Blackwater River Largemouth Bass 4 39.7 - 46.1 855 - 1781 0.89 33 Blackwater River Bowfin 4 55.7 - 62.6 1670 - 2185 0.95 33 Blackwater River Largemouth Bass 5 33.0 - 37.0 484 - 761 0.94 33 Blackwater River Largemouth Bass 2 50.0 - 54.3 1851 - 2701 1.48 33 Blackwater River Redear Sunfish 7 24.1 - 29.3 299 - 523 0.59 34 Blackwater River Bowfin* 3 56.8 - 62.9 1837 - 2153 2.06 34 Blackwater River Chain Pickerel 4 43.4 - 52.6 481 - 823 1.15 34 Blackwater River Largemouth Bass 3 31.4 - 38.5 460 - 864 0.73 34 Blackwater River Redear Sunfish 9 21.6 - 28.1 190 - 478 0.54 35 Blackwater River Bowfin 5 52.3 - 67.5 1418 - 2905 0.90 35 Blackwater River Chain Pickerel 3 37.3 - 44.5 311 - 484 0.63 35 Blackwater River Largemouth Bass 3 34.3 - 43.2 417 - 1314 1.14 35 Blackwater River Redear Sunfish 7 25.3 - 28.4 320 - 506 0.54 36 Nottoway River Blue Catfish* 1 92.0 15300 1.09 36 Nottoway River Blue Catfish* 1 73.7 5646 0.60 36 Nottoway River Bowfin 4 55.0 - 60.9 1613 - 1924 1.32 36 Nottoway River Largemouth Bass 5 33.5 - 40.3 480 - 1120 0.61 *Indicate fish sample that exceeded screening value for inorganic arsenic (inorganic arsenic is 20% of total arsenic reported in Appendix A. See appendix for total arsenic results). ppm = parts per million. cm = centimeters. g = grams. Summary of inorganic arsenic in fish from Chowan River basin Arsenic in fish is predominantly the less toxic organic arsenic. The remaining arsenic is the more toxic inorganic arsenic. Inorganic arsenic may be 5-15% of total arsenic, however, in abundance of caution VDH considers inorganic arsenic to account for 20% of total arsenic reported. VDH 4 calculates the inorganic arsenic in the two blue catfish from the Nottoway River to be 0.11 and 0.098 ppm, or 20% of total arsenic, 0.55 and 0.49 ppm, respectively. This exceeds VDH’s cancer SV for inorganic arsenic (0.09 ppm). The calculated inorganic arsenic (0.12 ppm) in a composite sample of three bowfin fish collected in the Blackwater River exceeded VDH’s cancer SV for inorganic arsenic Assessing the need for changes to the fish consumption advisories When assessing the fish tissue mercury and arsenic concentrations for the waterways sampled, VDH considers the abundance of the fish species in the waterway, their size, and the average concentration of contaminant in at least 12 fish of edible size before issuing a fish consumption advisory. VDH also seeks input from DEQ and the Department of Game and Inland Fisheries (DGIF). VDH met with DEQ to discuss the mercury and arsenic concentration in fish from these waterway in March 2019. Subsequently, VDH, DEQ, and DGIF discussed concerns and guidance when issuing a fish consumption advisory in April 2019.