U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Navajo Abandoned Uranium Mine Site Screen Report This form is for use at the site of abandoned uranium mines (AUM) located on Navajo Nation lands. Applicable sites include all mine and mine features that have or have not undergone reclamation by the Navajo Abandoned Mine Lands Reclamation Program, including features, adits, pits and waste piles. Applicable sites also include all AUM sites listed in the USEPA CERCLIS database, all sites listed in the 2008 AUM GIS Report issued by USACOE and USEPA, all AUM sites on allotment lands associated with the Navajo Nation, and any and all AUM sites not listed in any database located on Navajo lands. Reconnaissance of any sites located on lands adjacent to Navajo lands that may be impacting Navajo lands will need to be coordinated with the authorities appropriate to those lands. The purpose of the form is to ascertain the status and location of the identified A UM site, and record all immediate site information associated with the mine site. Decisions and recommendations on what additional steps are needed will be provided on a separate document. Black Hair No. 4 AUM Site Navajo AUM Western Region Prepared by: Weston Solutions, Inc. Contract: W91238-06-F-0083 12767.063.599.1111 January 2011 Black Hair No. 4, Mine ID # 384 1 January 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part I Site Identification, Location and Status Site Names and ID numbers as applicable Mine ID: 384 Map ID: W67 CERCLIS: NNN000909105 Navajo Abandoned Mine Land Reclamation Program: None Local name / Aliases: Blackhair #4 Chapter and local area: Cameron Chapter County: Coconino State: Arizona Lat/Long: 35.8126992549 N / -111.436811568 W Nearby road and highway: Highway 89 Local Post Office: Cameron, AZ Surface Land Status: check one or more and provide ownership and contact information below Tribal Trust Land ^ Public lands Q Private Q Tribal Fee Land Q Bureau of Land Mgmt Q Allotment Q State O Fee land Q Subsurface Mineral Rights: No information on subsurface mineral rights ownership was found in the EPA/AUM Database. Claim and operator information: The mine site surface land status is classified as Tribal Trust Land. No additional ownership / lease information was identified in the EPA/AUM database. Number of residential structures within 200 feet of mine: None Estimated volume of mine waste onsite: None Black Hair No. 4, Mine ID # 384 2 January 2011 ------- ¦G.S. Environmental Protection Agency Region IX, San Francisco Navajo AtlM Project Part II Summary of radiological readings Highest gamma radiation measurement: 46,385 counts per minute (cpm) Describe any other radiological measurements: A total of 1,642 gamma radiation measurements were collected from the mine site, ranging from 8,402 cpm to 46,385 cpm. The measurements collected at an isolated piece of petrified wood on front porch of the nearby house were found at a maximum level of approximately 45,000 cpm. The measurements are represented in Figures 1 and 2. Background Readings: 11,333 cpm Background Average: 11,333 cpm Distribution Chart and Statistics: The following chart and statistics were generated by ESR1 ArcGIS 9.3.1, and show the general distribution of the site gamma radiation measurements. The horizontal X axis represents the gamma radiation reading levels in cpm (lowest levels to the left). The vertical Y axis represents the frequency of each gamma radiation level. ~a~ o o o p o o o o 80-- 60-- 40-- 20-- 1 1 1 8402.00000 17897.75000 27393.50000 36889.25000 1 46385.000 Count: 1642 Minimum: 8402.00000 Maximum: 46385.00000 Sum: 26157355.00000 Mean: 15930.17966 Median: 14308.50000 Standard Deviation; 5878.48384 Black Hair No. 4, Mine ID # 384 3 January 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part III Status of Reclamation and Mine Waste The following information was obtained from the Navajo Abandoned Mine Land Reclamation Program (NAMLRP) Point Features Database: NAMLRP Status of the mine site: Reclaimed : No Waste Pile onsite : No NAMLRP Project Number: None NAMLRP Mine features: 1 Prospect The following information was obtained from field observations collected during the 2010 site screening: Provide description and status of all mine sites and features at site. Include all waste piles, adits, pits and other features, and indicate whether they are open, closed, covered, capped, buried or unreclaimed. Indicate approximate size, shape and extent, including description of any reclamation caps. Note condition of all caps. Observed reclamation work and status: Adits None Waste Piles None Pits None Shafts None Other Debris and Mine Features None Black Hair No. 4, Mine ID # 384 4 January 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part IV Site observations and Environs Observed Structures: list number of and describe human habitation status of structures at the following distances from mine: 0 to 200 feet: None 200 feet to 0.25 mile: Observed Public or commercial structure: list and describe all schools, clinics, Chapter Houses, places of business and any other structure used by members of the community at the following distances: 0 to 200 feet: None 200 feet to 0.25 mile: None Levels measured around the perimeter(s) of the identified structure(s): 42,000 cpm from petrified wood collection at house Observed water sources: list the number and type of wells and surface water sources that are potentially used for human consumption at the following distances from the mine: 0 to 0.25 miles: None 0.25 miles to 4 miles: Windmill Well approximately 3.5 mi SE of the site; Little Colorado River Basin approximately 4 mi NE of the site Sensitive environments: note and describe all sensitive environments located within visible range of the mine site, including: wetlands, endangered species, habitats and approximate locations of sites that may be under protection of the government of the Navajo Nation. None observed Known Site History: include information from interviews with Chapter officials and residents. Note information on mine ownership, type of mining operation, period of operation, known amount of production, and any other information as provided. Black Hair No.4 mine consists of an area of 11,657.68 m . No other historical information or any additional ownership / lease information was identified in the EPA/AUM database. Black Hair No. 4, Mine ID # 384 5 January 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part V Response Action Summary Summary of Evaluation Factors: Accessibility: Was the mine easily accessible to potential human activity? Yes Radiological Measurements: Were any gamma radiation measurements collected at the mine greater than two times the site-specific background levels? Yes Waste Piles: Were any unreclaimed waste piles observed at the mine with gamma radiation measurements greater than two times the site-specific background levels? No Structures: Were any structures observed within 200 feet of the mine? No Potential Drinking Water Sources: Were any potential drinking water sources observed within 4 miles of the mine? Yes Reclamation: Was the mine reported to be previously reclaimed, or did the mine appear to be reclaimed? No Black Hair No. 4, Mine ID # 384 6 January 2011 ------- ¦G.S. Environmental Protection Agency Region IX, San Francisco Part VI Photos Navajo AtlM Project Photo 1. Black Hair No. 4 mine site Black Hair No. 4. Mine ID # 384 7 January 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Black Hair No. 4, Mine ID # 384 Q January 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part VII Contacts Reports and Information Name: Stanley Edison (928) 871-6861 Eugene Esplain (928) 871-7331 Title or official role (if any) Navajo EPA Superfund Program Address PO Box 2946. Window Rock. AZ 86515 Information provided Lead Regulatory Agency Name Title or official role (if any) Address Telephone number Information provided Name Title or official role (if any) Telephone number Information provided Name Title or official role (if any) Telephone number Information provided Black Hair No. 4, Mine ID # 384 9 January 2011 ------- Figure 1 - Gamma Radiation Measurements, Above Two Times Background Black Hair No.4 (384) Cameron Chapter, Navajo Nation Legend Gamma Radiation Measurements • < 2X Backgound > 2X Background Gamma survey conducted 11/2010 Measured as counts per minute (cpm) Average background 11,333 cpm General Slope Direction Mine Site Boundary I Feet 400 wESBXEDSlZEl. ------- Figure 2 - Gamma Radiation Measurements Black Hair No.4 (384) Cameron Chapter, Navajo Nation Legend Gamma Radiation Measurements 0-10,000 10,000- 15,000 15,000-20,000 20,000-50,000 50,000- 100,000 > 100,000 General Slope Direction Mine Site Boundary I Feet Gamma survey conducted 11/2010 Measured as counts per minute (cpm) jgKL \m Q 400 || ||| Average background 11,333 cpm Xtftomnazti ------- |