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. NA-0420 AUM Site Navajo AUM Northern Region Prepared by: Weston Solutions, Inc. Contract: W91238-06-F-0083 12767.063.496.1111 August 2010 NA-0420, Mine ID # 276 1 August 2010 ------- 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: 276 Map ID: N66 CERCLIS: NNN000909002 Navajo Abandoned Mine Land Reclamation Program: NA-0420 Local name / Aliases: None Chapter and local area: Beclabito Chapter County: San Juan State: Utah Lat/Long: 36.833745404 N / -109.016591892 W Nearby road and highway: Highway 64 Local Post Office: Beclabito, 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 other historical 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 NA-0420, Mine ID # 276 2 August 2010 ------- ¦G.S. Environmental Protection Agency Region IX, San Francisco Part II Summary of radiological readings Navajo AtlM Project Highest gamma radiation measurement: 10,202 counts per minute (cpm) Describe any other radiological measurements: A total of 758 gamma radiation measurements were collected from the mine site, ranging from 5,649 cpm to 10,202 cpm. The measurements are represented in Figures 1 and 2. Background Locations Average background = 6,948 cpm #1 6,948 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. 40T ° O o o o 30-- 20-- 10-- 0 1 1 1 '—i 5649.00000 6787.25000 7925.50000 9063.75000 10202.00001 Count: 758 Minimum: 5649.00000 Maximum: 10202.00000 Sum: 5989683.00000 Mean: 7901.95646 Median: 7939.50000 Standard Deviation: 726.22936 NA-0420, Mine ID # 276 3 August 2010 ------- 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 : Yes Waste Pile onsite : No NAMLRP Project Number: NA-0420 NAMLRP Mine features: 1 Rim Strip / Pit 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 There is the possibility that the site has been reclaimed with a soil and/or gravel cap; concrete pad was located immediately S of site. NA-0420, Mine ID # 276 4 August 2010 ------- 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: None 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: Levels measured around the perimeter(s) of the identified structure(s): 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: Site within the town of Beclabito, may have multiple drinking water sources 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. NA-0420 mine consists of an area of 2,627.69 m . According to Beclabito Chapter House personnel, site activities included the collection and transfer of ore materials. Site may be mistaken for NA-0424 (ID# 277). No other historical information or any additional ownership / lease information was identified in the EPA/AUM database. NA-0420, Mine ID # 276 5 August 2010 ------- U.S. Environmental Protection Agency Region IX, San Francisco Part V Response Action Summary Site Name(s): NA-0420 Chapter: Beclabito Navajo AUM Project Decision Criteria Is there an unreclaimed waste pile at the site? No At what distance from the waste pile is the nearest residential structure located? None At what distances from the waste pile are there potential drinking water sources? None Is there a reclamation cap or sealed adit in place at the site? Yes Is the cap/seal functionally intact? Yes Is the cap/seal sufficiently degraded to create a concern about releases? No At what distance from the cap/seal is the nearest domestic structure located? At what distance from the cap/seal is the nearest domestic drinking water source? Unknown Summary of emergency response factors None Summary hazard ranking system factors None Summary of reclamation factors Possible gravel cap NA-0420, Mine ID # 276 6 August 2010 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part VI Photos NA-0420, Mine ID # 276 7 August 2010 ------- ¦G.S. Environmental Protection Agency Region IX, San Francisco Navajo AtlM Project Photo 4. NA-0420 site, concrete pad, labeled 3-29-71 NA-0420, Mine ID # 276 8 August 2010 ------- 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: Albert Paul (928)320-1142 (928)656-3265 Title or official role (if any) Beclanito Chapter House Program Specialist Information provided Background information Name Title or official role (if any) Telephone number Information provided Name Title or official role (if any) Telephone number Information provided NA-0420, Mine ID # 276 9 August 2010 ------- Figure 1 - Gamma Radiation Measurements, Above Two Times Background NA-0420 (276) Beclabito Chapter, Navajo Nation I NA-0420 (276) I Legend Gamma Radiation Measurements • < 2X Backgound > 2X Background —~ Genera! Direction Down-Slope ~ Mine Ciaim Boundaries Gamma survey conducted 06/2010 Measured as counts per minute (cpm) Average background = 6,948 cpm I Feet 250 ffBmnBQZEi. ------- Figure 2 - Gamma Radiation Measurements NA-0420 (276) Beclabito Chapter, Navajo Nation ~ NA-0420 (276) ~ 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 Direction Down-Slope ~ Mine Claim Boundaries Gamma survey conducted 06/2010 Measured as counts per minute (cpm) Average background 6,948 cpm I Feet 250 fl % ^ p ------- |