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Site Inspection Report for the Nabesna Mine Nabesna,Alaska

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Site Inspection Report for the Nabesna Mine Nabesna,Alaska AR000001 SITE INSPECTION REPORT FOR THE NABESNA MINE NABESNA,ALASKA CERCLIS ID NO_.. AK0000333021 Prepared for: Work Assignment No. 54-17-0JZZ Contract No. 68-W9-0054 United States Environmental Protection Agency Region 10 1200 Sixth Avenue Seattle, Washington 98101 September 26, 1995 Prepared by: URS Consulta nts, Inc. 1100 Olive Way, Suite 200 Seattle, Washington 98101 URS DCN 62760.35.20.1043.45.bl I . AR000002 Nabcsn:i. Mine, Nabesna, Alaska Conte □ ts Site Inspection Report Page iii CO:\TEi\TS Section Pa2e ABBREVIATIONS AND ACRONYMS . ........ .. ... .. ................ vii 1.0 INTRODUCTION . 1-1 2.0 SITE BACKGROUND ......... -. ..... .. ................... 2-1 2.1 SITE LOCATION . 2-1 2.2 SITE DESCRIPTION . 2- 1 2.3 SITE PHYSICAL AND GEOLQ.GICAL CHARACTERISTICS . 2-2 2.4 SITE OPERATIONS AND WASTE CHARACTERISTICS . 2-6 2.4.1 Gold Mining . 2-7 2.4.2 Gold Recovery . 2-8 7__ )- PREVIOUS SITE SAMPLING AND INVESTIGATIONS ......... 2-10 3.0 EXPOSURE PATHWAYS AND POTENTIAL TARGETS .............. 3-1 3.1 GROUNDWATER PATHWAY ............ ... ... .. ... .. 3-1 3.2 SURFACE WATER PATHWAY ..... ............. ....... 3-2 3.3 SOIL EXPOSURE PATHWAY . ..... ..................... 3-3 3.4 AJR EXPOSURE PATHWAY ....... .... ....... ......... 3-3 4.0 SAMPLING PROGRAM . 4-1 4.1 OBJECTIVES A.!~D SCOPE . 4-1 4.2 SA.!'v1PLING METHODS . 4-6 4.2.1 Surface Soil . 4-6 4.2.2 Surface Tailings . 4-6 4.2.3 Subsurface Tailings . 4-6 4.2.4 Surface Water . 4-6 4.2.5 Sediment . 4-7 4.3 ANALYTICAL AND HANDLING REQUIREMENTS ... ........ 4-7 5.0 SA.!vfPLE RESULTS A.!"TD DISCUSSION . 5-1 5.1 SOIL SAMPLE RESULTS . 5-2 5.1.1 SVOC Analyses . 5-2 5.1.2 PCB Analyses . .. 5-5 5.1.3 ·Pesticide Analyses ........ ............. ... ...... 5-5 5.1.4 Inorganic Analyses . 5-5 5.1.5 Cyanide Analyses . 5-6 6276019509 .065\TOC AR000003 Nabcsna ;\line, Nabcsna, Alaska Contents Site Inspection Report Page iv CO\'TE\'TS (Continued) Section SURFACE AND SUBSURFACE Mif\:E TAI LI~GS . 5-6 5.2.1 Inorganic Analyses of Mine Tailings . 5-6 5.2.2 Cyanide Analyses for Mine Tailings . 5-8 5.3 SURFACE WATER SAMPLE RESULTS ........ .......... 5-8 5.3.1 Inorganic Analyses . 5-8 5.3.2 Cyanide Analysis .. ........ ...... ..... .. ....... 5- 10 5.3.3 Hardness Analysis . .... ................ ........ 5- 10 5.4 SEDIMENT SAMPLE RESULTS ......... .. .. ... .... ... .. 5-11 5.4.1 SVOC Analyses ..... .· .. ...... ... ................ 5-11 5.4.2 PCB Analyses ....... .. .............. .. ....... 5-1 2 5.4.3 Pesticide Analyses . ...· . .. .. .. .. ...... .......... 5-1 2 5.4.4 In organi~ Analyses . ... .... ...... ... .. .... ... ..... 5-12 5.4.5 Cyanide Analysis .. ........ ..... ....... ...... .. 5-1 2 5.5 INVESTIGATION-DERIVED WASTE ............. ........ 5-14 5.6 QUALITY CONTROL SAMPLES .. ........... ... ...... .. 5-14 5. 7 SUMMARY .... .. ............. .. ... ..... .. 5-14 6.0 REFERENCES . 6-1 APP EN DI XES A PHOTOGRAPHIC LOG OF JUNE 20-21 , 1995, SITE VISIT B USGS MAP OF THE GEOLOGY OF THE AREA C CROSS-SECTION MAP OF THE :-IABESNA MINE D DIAGRA.iv[S OF UPPER At'\J D LOWER MINE TAILINGS E CYA.!\T IDE PROCESS FLOW CH.ART F WELL LOG G NET PRECIPITATION H DA.TA RESULTS AND VALIDA.TIO .. I GEOCHEMICAL DATA FOR E;\VIRONME1 T-\L STUDIES AT NABES~A 6276019509.065\TOC AR000004 Nabcsna Mine, Nabesna, Alaska Contents Site Inspection Report Page \i ABBREVIATIO NS Al'-:D ACROi'-tYMS ANILCA Alaska National Interest Lands Conservation Act of 1980 bgs below ground surface · CERCLA Comprehensive Environm·encal Response, Compensation, and Liability Act of 1980 CFR Code of Federal Regulations DQO data quality objecti ve EPA United States Environmental Protection Agency IDW investigative-derived waste MS/MSD matrix spike/matrix spike 'd.uplicate Nabesna Nabesna Mine NRHP National Register of Historic Pl aces NPL National .Priorities List NPS National Park Service PCB polychlorinated biphenyl QMP Quality Management Pl an SAM site assessment manager SARA Superfund Amendments and Reauthorization Act of 1986 SI site inspection SQL sample quantitation limit SVOCs semivolatile organic compounds TSOP Technical Standard Operating Procedures URS URS Consultants, Inc. 6276019509.065\TOC AR000005 Nabcsna :Vfi ne, Nabesna, Alaska Contents Site Inspection Report Page v fI GURES Pa£e 2-1 Vicinity 1\ ·lap ... ...... ...... ......... ..... ... 2-3 2-2 Aerial Photograph of Site .. ... ... ..... .. .. ..... 2-4 2-3 Nabesna Mine Site Map .. .......... ...... ..... 2-5 4- 1 On-Site Sampling Locations . .. ........ ......... 4-4 4-2 ·Off-Site Sampling Locations ................ .. ... .... 4-5 TABLES Page 2-1 Site Operations and Ownership . 2-9 2-2 Summary of Environmental Fate and Transport of Cyanide From Mining Wastes .... , .. .. .. ..... .... .. .. ........ .... ..... ... 2- I I 2-3 Previous Sampling Resu lts ................ .... .... .. ....... 2-1 2 3-1 Groundwater Drinking Populations Within 4 Miles of the Site . 3-1 3-2 Stratigraphy . 3-2 3-3 Description of Surface \.Vater 15 Miles Do\vnstream ... .. .. .... ...· . .. - 3-2 3-4 Residents and Wetland Acreage wi thin a 4-Mile Radius . 3-4 4-1 Sample Descriptions . 4-2 5- 1 Significance Criteria for Chemical Analysis . 5-1 5-2 Semivolatile Organic Compounds in Surface Soil . 5-2 5-3 PCBs/Pesticides in Sediments, Soil, and Rinsate . 5-3 5-4 Inorganics in Soils . 5-4 5-5 Inorganics in Tailings . 5-7 5-6 lnorganics in Surface Water . 5-9 5-7 Surface Water Properties . ... .......... .... ... .... .... .... 5-10 5-8 Sem.ivo latile Organic Compounds in Sediments .. ....... ... ....... 5-11 5-9 Inorganics in Sedi men ts ... ... .. .. ..... .. .................... 5-13 5-10 Sem.ivolatile Organic Compounds and Inorganics in Equipment Rinsate and Laboratory Method Blanks . ..... .... ........... .......... 5-15 5-11 Summary of Signi fi cant Concentrations of Chem.icals From the N2.besna Mine .. .... ... ............... ... .. .. .. ... .... .... 5-1 6 62760\9509. 0651TOC AR000006 Nabcsn:i Mine, Nabesn:i, Al:isb Section 1.0 Site In spccti un Report Page 1-1 1.0 Ii\TRODUCTION Pursuant to United States Environmental Protection Agency (EPA) Contract ~o. 68-W9-0054 and Work Assignment No. 54-·17-0JZZ, URS Consultants, Inc. (URS) has conducted a site inspection (S I) of the Nabesn:a Mine (Nabesna) site located at Milepost 46 on the Nabesna/Slana Road, Nabesna, Alaska. This SI was conducted under the authority of the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, as amended by the Superfund Amendments and Reauthorization Act of 19S6 (SARA). The SI process is intended to (1) document a threat or potential threat to public health or the environment posed by a site; (2) identify if a potential emergency situation exists that may require an im mediate _response; (3) document the presence or absence of uncontained or uncontrolled hazardous substances on a site; and (4) confirm site characteristics and area receptor information collected during the preliminary assessment. The SI is in tended to collect sufficient data to enable evaluation of the site's potential for inclusion on the ' National Priorities List (NPL), and, for th ose sites determined to be NPL candidates, establish priorities for additional action. The SI process and this SI do not include extensive or complete site characterization, contaminant fate determination, or quantitative ecological or hu man health risk assessment. Sections of this document present specific information regarding the Nabesna SI: • Section 1.0: Introduction-provides a description of authority and purpose • Section 2.0: Site Background-provides a summary of site-related information • Section 3.0: Environmental Pathways and Potential Targets-includes an evaluation of specific pathways • Section 4.0: Sampling Program-includes a synopsis of sampling conducted • Section 5.0: Sample Results and Discussion-provides a discussion of sampling results • Section 6.0: References- provides a list of references 61760\9509.065 \SECTION I AR000007 1 , ◊, ) 100' Levi/ ( ( ' C, (} / 1 \ I 1\ , j I 1 / ,' ·._ \I ! , I 3900 , 'I / / / ,r '. 1' I I I I I I , , I I '-. 3soo 3700 36~ 3~60 ( & ' i j / 3400 3~00 I '-./, L , I / 3 o, ,' / ~- -. 250' Level / I I I I I / / \ ~Tram to Mine / ) ,/J ~ 1 I 2900 ✓' 3100 I (Dismanll,ed) / / &j1 .,., 3000 I I' \'- ,✓ I r ,·, ' I I '-' If I I j, I I, , \·... I / / !---..?/, 7 I ; -s:-(Y1 I '-h''-\' / ~,~ I I I ,,~I I ~ I ~I \i\ . I 0 , "S:° •i, I !---._'V / I -3- , / '._'if'\ / ~ , . -,,,./I r:v'v , i ~~ I- ', -,\ ~ , I ~ I ,,/ \\ I , ff , i §f / / \\ ◊650'Leve l ij~;, I , I / \...~.t,~1/ --~--,/ /''\':/ , ~,. ·:- ; Upper Tailings I __ . I ~ / / , \, I / I / , \ I t _,, I / \_◊ , , ... Lower Tailings -----~ .'/ / -◊ I I- / ,,',,,/ I :,.~;}r· / ,--;·~~~esna Mine .. / 1 Gh~stTown~ / 0 I ,... .., ... ... ... (. , ,' o0 ~ . /I ~-0 I ''..,, . ' 0 ~ LEGEND ............ ~i ~ Mining Claims .., \ I .., -. .., .., I Drawing Nol to Scale .._-. I \ +NORTH \ ...... Source: National Park Service, 1994; Figure 2-3 Nabesna Mine Nabesna, Alaska URS Nabesna Mine Site Map SITEINSPECTION CONSULTANTS ~ 16276035--4-112995 AR000008 Nabesna Mine, Nabesna, Alaska Section '2.0 Site Inspection Report Page 2-1 2.0 SITE BACKGROUND 2. 1 SITE LOCATION Site Name: Nabesna Mine CERCLIS No: AK000033302 l Location: Milepost 46, Nabesna/Slana Road Nabesna, Alaska Latitude: 62.22'20.0" North Longitude: 143 ·o· 17.0" West Legal Description: Section 21, Township 7 North, Range 13 East Site Owner: Mr. Kirk Stanley Ptarmigan Company, Inc. P.O. Box 200956 Anchorage, Alaska 99520 (907) 333-5639 Site Operator: Site is currently inactive Site Contact: Mr. Kirk Stanley (907) 333-5639 2.2 SITE DESCRIPTION The Nabesna site, which consists of a gold mine, is located in the White Mountains in the northern portion of the Wrangell-Saint Elias National Park and Preserve. This area is located in the southeastern section of Alaska; approximately 300 miles east of Anchorage. Gold mining operations began in the early 1900s and continued until the 1940s. The site is a privately owned, patented mining claim (the Sunshine Lode), which is one of several mining claims in the area owned by the Ptarmigan Company.
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