Tetlin National Wildlife Refuge - USFWS Alaska Region - U.S. Fish ...

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Alaska Highway not exposed to dioxin residues. There was also enough public concern to prompt the USACE to conduct dioxin sampling along the length of the pipeline corridor in Alaska (see above). Absence of positive results from the pipeline testing is not sufficient evidence to rule out contamination at Seaton Roadhouse, however, since higher pesticide residues are often found at mixing and loading sites, where spills occur most often. Sampling was conducted to evaluate potential hydrocarbon, metal, herbicide, and dioxin/furan contamination at Seaton Roadhouse. Samples were collected in September 2004, June 2005 and September 2005. Environmental Contaminants Specialists collected a total of 39 soil samples, 22 surface water samples and 22 sediment samples. Sample locations were determined in the field, targeting disturbed areas, areas with soil staining, chemical odors, drums/debris, or at representative locations (e.g., sediment and water samples were taken at equidistant locations around the perimeter of three ponds). Three soil samples were taken at background locations for comparison with samples taken from areas of potential concern. Water samples were analyzed for DRO and GRO. Soil samples collected in June 2005 were analyzed for GRO, DRO and inorganic constituents (including mercury). Soil samples collected in September 2005 were analyzed for dioxins/furans with total organic carbon, and chlorphenoxy herbicides. Photos taken in fall 2004 depicting the various debris at the Seaton Roadhouse site. Contaminant Assessment D. Rocque/USFWS 29
Alaska Same as Highway the text heading Iron in stream leading to Seaton Pond. USFWS 30 Tetlin National Wildlife Refuge Sediment samples were collected in both September 2004 and June 2005 for GRO, DRO and inorganic parameters. Soil Results: Three soil samples contained arsenic above the ADEC cleanup level of 2 mg/kg, however the method reporting limit for arsenic in all soil samples was above the cleanup value. Ten chromium values were above the ADEC cleanup value of 26 mg/kg. Although multiple soil samples exceeded ADEC cleanup levels for chromium and arsenic, those levels are within background concentrations found throughout Alaska, were scattered within the site, and did not appear to be linked to specific areas of concern. In 2007, the Service plans on conducting further evaluation of background soil concentrations in the area around Seaton Roadhouse, to help determine if these results are related to site contamination. One sample taken near the location of some electrical debris contained 460 mg/kg lead, which exceeds the ADEC cleanup level of 400 mg/kg in residential soil. In 2007 we plan on determining the extent of contamination prior to soil cleanup. GRO was detected in nine soil samples and DRO was detected in 16 of the soil samples, but none exceeded ADEC Method 2 cleanup values. In 2007 the Service plans to take additional soil samples verify that soil a cleanup of hydrocarbon contaminated soils is not required at this site. The only herbicide detected in soils was clopyralid, which was present in three samples. Clopyralid is a relatively persistent broad leaf defoliant found in 21 commercially available herbicides. No ADEC or EPA cleanup values have been established for this herbicide. Polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), otherwise known as dioxins and furans, were evaluated in 20 soil samples from potential areas of concern. Toxic equivalency quotients (TEQs) for each congener were calculated using standard procedures and summed to produce a total TEQ concentration. One soil sample had a TEQ of 57.6 ng/kg, which exceeds the EPA’s Region 9 Preliminary Remediation Goal (PRG) of 39 ng/kg. None of the remaining samples exceeded
Page 1 and 2: U.S. Fish & Wildlife Service Tetlin
Page 3 and 4: Executive Summary The purpose of th
Page 5 and 6: Table of Contents Physical Transpor
Page 7 and 8: Acronyms and Abbreviations AAC Alas
Page 9 and 10: viii Tetlin National Wildlife Refug
Page 11 and 12: Contaminant Assessment Process 2 Te
Page 13 and 14: Tetlin National Wildlife Refuge 4 T
Page 19 and 20: Contaminant Sources and Issues 10 T
Page 21 and 22: Formerly Used Defense Sites 12 Tetl
Page 23 and 24: Formerly Used Defense Sites Lake in
Page 25 and 26: Formerly Used Defense Sites CANOL p
Page 27 and 28: Formerly Used Defense Sites A porti
Page 29 and 30: Formerly Used Defense Sites The pip
Page 31 and 32: Formerly Used Defense Sites 22 Tetl
Page 33 and 34: Same Formerly as the Used text Defe
Page 35 and 36: Landfill A recently used shooting r
Page 37: Alaska Highway Seaton Pond in early
Page 41 and 42: Scotty Creek Flats near the northea
Page 43 and 44: Camps and Cabins 34 Tetlin National
Page 45 and 46: Mining Sedimentation of lake on Yel
Page 47 and 48: Same as the text heading Water Qual
Page 49 and 50: Recreation USFWS 40 Tetlin National
Page 51 and 52: Conclusions The Tetlin National Wil
Page 53 and 54: References 44 Tetlin National Wildl
Page 55: Tetlin National Wildlife Refuge P.O

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