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. Julia Semallie AUM Site Navajo AUM Western Region Prepared by: Weston Solutions, Inc. Contract: W91238-06-F-0083 12767.063.599.1111 January 2011 Julia Semallie, Mine ID # 154 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: 154 Map ID: W121 CERCLIS: NNN000909081 Navajo Abandoned Mine Land Reclamation Program: NA-0198 Local name / Aliases: Julia Semalie; J. Semalie; Julia Semallie common pit Chapter and local area: Coalmine Mesa Chapter County: Coconino State: Arizona Lat/Long: 35.6425509509 N / -111.276304856 W Nearby road and highway: Indian Route 6730 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. Historical documents showed the operator of the mine as the Steinberger Drilling Company from 1957 to 1958. 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 Julia Semallie, Mine ID # 154 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: 27,616 counts per minute (cpm) Describe any other radiological measurements: A total of 2,285 gamma radiation measurements were collected from the mine site, ranging from 11,972 cpm to 27,616 cpm. The measurements collected at the reclamation caps were found at a maximum level of approximately 25,000 cpm, and at background levels near the corral. The measurements are represented in Figures 1 and 2. Background Readings: 13,707 cpm Background Average: 13,707 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. 150-, 00000 000SI 20000.00000 100- 50- 0 1 1 1 1 11972.00000 15883.00000 19794.00000 23705.00000 27616.00001 Count: 2285 Minimum: 11972.00000 Maximum: 27616.00000 Sum: 35733720.00000 Mean: 15638.38950 Median: 14673.00000 Standard Deviation: 2514.94196 Julia Semallie, Mine ID # 154 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 : Yes Waste Pile onsite : No NAMLRP Project Number: NA-0198 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 2 reclamation caps, shared with site #542: western cap 1000' x 300'; eastern cap 400' x 100', both made of grey material Julia Semallie, Mine ID # 154 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): Background levels near corral 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: Pond area behind livestock corral, approximately 750' SW of the site 0.25 miles to 4 miles: Little Colorado River Basin approximately 2 mi W 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. Julia Semallie mine consists of an area of 68,218.5 m . The mine was identified as being operational from 1957 to 1958. Historical documents showed the operator of the mine as the Steinberger Drilling Company from 1957 to 1958. While operational, the mine had a total reported production volume of 1,623 tons. The Julia Semallie and Emmett Lee No. 3 (542) sites reportedly mined from a single common pit. No other historical information or any additional ownership / lease information was identified in the EPA/AUM database. Julia Semallie, Mine ID # 154 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? Yes (two reclamation caps) Julia Semallie, Mine ID # 154 6 January 2011 ------- ¦G.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part VI Photos Photo 2. Julia Semallie mine site, reclamation cap Julia Semallie, Mine ID # 154 7 January 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Julia Semallie, Mine ID # 154 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 Julia Semallie, Mine ID # 154 9 January 2011 ------- Figure 1 - Gamma Radiation Measurements, Above Two Times Background Julia Semallie (154) Coalmine Mesa Chapter, Navajo Nation Emmett Lee No. 3 (542) Legend Gamma Radiation Measurements • < 2X Backgourid > 2X Background Gamma survey conducted 11/2010 Measured as counts per minute (cpm) Average background 13,707 cpm General Slope Direction Observed Reclamation Area Mine Site Boundary Feet a ^ 250 * s| ------- Figure 2 - Gamma Radiation Measurements Julia Semallie (154) Coalmine Mesa Chapter, Navajo Nation F\. \ N m Emmett Lee No. 3 (542) 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 Observed Reclamation Area Mine Site Boundary Gamma survey conducted 11/2010 Measured as counts per minute (cpm) Average background 13,707 cpm I Feet 250 ------- |