DOE/ORO/2327 Oak Ridge Reservation Annual Site Environmental ...

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Oak Ridge Reservation 3-54 East Tennessee Technology Park Table 3.28. Storm water sampling results from K-702-A Slough exceeding screening levels Location sampled Sampling Event Mercury (ng/L) Thallium (µg/L) Outfall 992 Pool Dry weather 10.1 18 Outfall 992 Pool Wet weather 10.8 19.4 K-702-A West End Dry weather 5.18 23.9 K-702-A West End Wet weather 4.82 17.5 K-702-A East End Dry weather 10.5 18.2 K-702-A East End Wet weather 16.2 13.3 K-702-A Middle Dry weather 13.5 18.4 K-702-A Middle Wet weather 14.2 13.1 3.5.1.10 Investigation of PCBs, Mercury, and Metals in Mitchell Branch and Associated Storm Water Outfalls PCBs, mercury and other metals have been detected in the water sampling performed at outfalls that contribute flow to Mitchell Branch. In an effort to obtain more current analytical data from the discharges from these outfalls and identify how the discharges from these outfalls might be affecting the water quality of Mitchell Branch, sampling for PCBs, mercury, and metals was requested at several storm water outfall locations and at several locations within Mitchell Branch. Sampling was conducted at the following nine locations: Outfalls 170, 180, 190, 198; Mitchell Branch locations MIK-1.4, 0.71, 0.59, 0.45; and K-1700. Samples at all locations were analyzed for PCBs, total mercury, and metals. In addition, samples were collected at outfall 180, MIK-0.59, and K-1700 for analysis for methyl mercury. Comparison of analytical results to the Tennessee Water Quality Criteria (TN 1200-4-3 General Water Quality Criteria) was performed. The applicable water quality criterion for mercury is 0.051 µg/L; therefore, total mercury samples were analyzed by a laboratory that has a method detection limit (MDL) for mercury that is below this criterion. The laboratory method used for total mercury analysis is the EPA 1631 method since it can detect mercury below the water quality criterion. Depending on the laboratory that runs the analysis, the EPA 1631 method has a detection limit as low as 0.5 ng/L. Methyl mercury samples were to be analyzed using the EPA 1630 method. Based on the laboratory that performs the analysis, this method has a detection limit as low as 0.02 ng/L. Analysis for metals at all storm drain and in-stream locations was performed using the EPA 200.7 method. In addition, replicate metals samples that were analyzed using the EPA 200.8 method were collected at all in-stream locations. The additional metals sampling was collected to provide analytical data on all metals detected by these two analytical methods for the instream locations. The sampling effort also provided a quality assurance/quality control check for the laboratories. Analysis for PCBs was done using the EPA 608 method. Samples were collected during both wet weather and dry weather conditions. Wet weather samples were collected from flows resulting from a storm event greater than 0.1 inch in magnitude in 24 hours and that occurred at least 72 hours after any previous storm event of 0.1 inch or greater in 24 hours. If an intermittent rainfall occurred over a period of 24 hours and did not equal or exceed 0.1 inch, it was not considered to be a storm event, and the 72-hour delay until the next rainfall which can potentially be sampled was not in effect. Wet weather sampling of all locations was conducted during the same storm event, when possible. Mitchell Branch samples were collected progressing from the farthest downstream sampling location to the farthest upstream sampling location. All of the wet weather samples were collected by the manual grab sampling technique. This sampling effort is outlined in Table 3.29.
Annual Site Environmental Report Table 3.29. Wet Weather Sampling for PCBs, Mercury, and Metals Sampling location PCBs ICP metals (by EPA 200.7) ICP metals (by EPA 200.8) Total mercury Methyl mercury Outfall 170 X X X Outfall 180 X X X X Outfall 190 X X X MIK-1.4 X X X X MIK-0.71 X X X X MIK-0.59 X X X X X MIK-0.45 X X X X K-1700 X X X X X Table 3.30 indicates the parameters that exceeded screening levels in samples collected in September 2009 under wet weather conditions. Analytes that exceeded an applicable water quality criterion included thallium at K-1700 (result of 1.13 µg/L exceeded criterion of 0.051 µg/L), mercury at outfall 180 (0.0884 µg/L, and total chromium at outfall 170 (16.1 µg/L). No other exceedances of screening levels were noted in the analytical data from this sampling effort. Table 3.30. Results of wet weather sampling for PCBs, mercury, and metals that exceeded screening levels—September 2009 Sampling location Total mercury (ng/L) Thallium (µg/L) Chromium (µg/L) MIK-1.4 5.4 Outfall 170 5.3 16.1 MIK-0.71 4.2 Outfall 180 88.4 MIK-0.59 10.4 Outfall 190 36 MIK-0.45 18.4
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Oak Ridge Reservation Annual Site E
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Appendix A. Errata
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Appendix B. Glossary
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Table D.1. Reference standards for
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F.5.10 Dose from Consumer Products
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Appendix G. Chemicals This appendix
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BW = body weight (70 kg), and Annua
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