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 (A UM) 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 A UM 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. Mine Name: Charles Huskon No. 19 Mine IDs: 120, 229 Navajo AUM Western Region Prepared by: Weston Solutions, Inc. Contract: W91238-06-F-0083 20074.063.017.0020 August 2011 Charles Huskon No. 19; Mine ID#s 120, 229 1 August 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: 120; 229 Map ID: 120: W32 229: W31 CERCLIS: NNN000909209 Navajo Abandoned Mine Land Reclamation Program: 120: NA-0123 229: NA-0124c Local name / Aliases: Charles Huskon #19 Chapter and local area: Coalmine Mesa County: Coconino State: Arizona Lat/Long: 120: 35.9088811943 N /-111.39820095 W 229: 35.942474397 N/-111.401151253 W Nearby road and highway: US-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 EH Private EH Tribal Fee Land EH Bureau of Land Mgmt EH Allotment EH State EH Fee land EH Subsurface Mineral Rights: No information on subsurface mineral rights ownership was found in the EPA/AUM Database. Claim and operator information: The mine surface land status is classified as Tribal Trust Land. Historical documents identified the operator of the mine as Utco Uranium Corporation in 1957. No additional historical ownership / lease information was identified in the EPA / AUM database. Number of residential structures within 200 feet of mine: None Charles Huskon No. 19; Mine ID#s 120, 229 2 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part II Summary of Radiological Readings Mine ID: 120 Highest gamma radiation measurement: 110,148 counts per minute (cpm) Background Average: 12,892 cpm Two Times Background: 25,784 cpm Describe any other radiological measurements: A total of 1,897 gamma radiation measurements were collected from the mine site, ranging from 5,599 cpm to 110,148 cpm. The measurements are represented in Figures 1 and 2. Distribution Chart and Statistics: Site Gamma Radiation Statistics Number of Readings 1,897 Minimum (cpm) 5,599 Maximum (cpm) 110,148 Mean (cpm) 14,390 Median (cpm) 12,377 Standard Deviation 8,532 9* Pi 4- A 000 800 600 400 200 000 800 600 400 200 0 Site (i;iniiii;i Radiation Distribution _L < 10K 10K - 25K- 50K - 100K- 250K- 500K- 25K 50K 100K 250K 500K 1,000K Counts Pei' Minute (cpm) H< 10K B 10K-25K U25K-50K y50K-100K B100K-250K B 250K-500K ¦ 500K - 1,000K Charles HuskonNo. 19; Mine ID#s 120. 229 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Mine ID: 229 Highest gamma radiation measurement: 25,404 counts per minute (cpm) Background Average: 12,871 cpm Two Times Background: 25,742 cpm Describe any other radiological measurements: A total of 2,378 gamma radiation measurements were collected from the mine site, ranging from 7,246 cpm to 25,404 cpm. Measurements collected in the vicinity of the reclamation area were found at a maximum level of approximately 20,000 cpm. The measurements are represented in Figures 1 and 2. Site Gamma Radiation Statistics Number of Readings 2,378 Minimum (cpm) 7,246 Maximum (cpm) 25,404 Mean (cpm) 13,511 Median (cpm) 13,981 Standard Deviation 2,157 Site Gamma Radiation Distribution 2,500 2,000 S 1,500 Pi S 1,000 A 500 < 10K 10K - 25K 25K- 50K 50K- 100K 100K - 250K 250K- 500K 500K- 1,000K Counts Pei Minute (cpm) H< 10K B 10K-25K U25K-50K U50K-100K H100K-250K H 250K-500K ¦ 500K - 1,000K Charles HuskonNo. 19; Mine ID#s 120. 229 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part III Status of Reclamation and Mine Waste Mine ID: 120 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-0123 NAMLRP Mine features: 1 Rim Strip / Pit The following information was obtained from field observations collected during the 2011 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 observed Waste Piles: None observed Pits: None observed Shafts: None observed Other Debris and Mine Features: Excavation area in center of site Charles HuskonNo. 19; Mine ID#s 120, 229 5 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Mine ID: 229 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-0124c NAMLRP Mine features: 1 Rim Strip / Pit The following information was obtained from field observations collected during the 2011 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 observed Waste Piles: None observed Pits: None observed Shafts: None observed Other Debris and Mine Features: 2 reclamation caps: Cap 1 - 100' x 80' x 2.5', red-brown soil with small gravel and berm along SE corner; Cap 2 - 75'dia x 1.5'h, red-brown soil with small gravel Charles HuskonNo. 19; Mine ID#s 120, 229 6 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part IV Site Observations and Environs Observed Residential Structures (number and human habitation status of structures at the following distances from the mine site): 0 to 200 feet: None observed 200 feet to 0.25 mile: Observed Public or Commercial Structures (schools, clinics, Chapter Houses, places of business and any other structures used by members of the community at the following distances from the mine site): 0 to 200 feet: None observed 200 feet to 0.25 mile: None observed Levels measured around the perimeter(s) of the identified structure(s): Background levels Observed Water Sources (number and type of wells and surface water sources that are potentially used for human consumption at the following distances from the mine site): 0 to 0.25 miles: Small livestock pond on site #229 0.25 miles to 4 miles: Seasonal tributary to Little Colorado River approximately 1.5 mi W of sites, Little Colorado River approximately 2.5 mi S of sites Sensitive Environments (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 (information from interviews with Chapter officials and residents and database review, includes: mine ownership, type of mining operation, period of operation, known amount of production, and any other information provided): The Charles Huskon No. 19 mine claim consists of two separate mine sites (#'s 120, 229) with a total combined area of 58,832.77 m2. The mine was identified as being operational in 1957. While operational, the mine had a total reported production volume of 696 tons. The mine surface land status is classified as Tribal Trust Land. Historical documents identified the operator of the mine as Utco Uranium Corporation in 1957. No additional historical ownership / lease information was identified in the EPA / AUM database. Charles Huskon No. 19; Mine ID#s 120, 229 7 August 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 Charles HuskonNo. 19; Mine ID#s 120, 229 8 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Part VI Photos Navajo AUtt Project Photo 1: Mine Site #120 Photo 2: Mine Site #120; Berm Charles HuskonNo. 19; Mine II) s 120, 229 9 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Charles Huskon No. 19; Mine ID#s 120, 229 ^ Q August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Charles Huskon No. 19; Mine ID#s 120, 229 ^ \ August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Photo 8: Mine Site #229 Charles HuskonNo. 19; Mine II) s 120, 229 12 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Photo 9: Mine Site #229; Reclamation area and spring/pond Photo 10: Mine Site #229; Reclamation area Charles HuskonNo. 19; Mine II) s 120, 229 13 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Photo 11: Mine Site #229; Spring/pond Charles HuskonNo. 19; Mine II) s 120, 229 14 August 2011 ------- U.S. Environmental Protection Agency Region IX, San Francisco Navajo AUM Project Part VII Contacts Reports and Information Name: Eugene Esplain Title or official role (if any): Navajo EPA Superfund Program Telephone number: (928) 871-7331 Address: PO Box 2946. Window Rock. AZ 86515 Information provided: Lead Regulatory Agency Name: Title or official role (if any): Telephone number: Address: Information provided: Name: Title or official role (if any): Telephone number: Address: Information provided: Charles HuskonNo. 19; Mine ID#s 120, 229 15 August 2011 ------- Figure 1 - Gamma Radiation Measurements, Above Two Times Background Charles Huskon No. 19 (120, 229) Coalmine Mesa Chapter, Navajo Nation C h a rlesl^us RonTN jtf. 1'9 > 2X Background Measured as counts per minute (cpm) Average background 12,882 cpm Observed Reclamation Feature -avi h .. Observed Waste Pile Steep Grade * 300 ( 0[ ------- Figure 2 - Gamma Radiation Measurements Charles Huskon No. 19 (120, 229) Coalmine Mesa Chapter, Navajo Nation pharlesiHL?kSNoBS5S Gamma Radiation Measurements • 0- 10,000 cpm • 10,000 - 25,000 cpm 25,000 - 50,000 cpm 50,000 - 100,000 cpm • 100,000 -250,000 cpm • 250,000 -500,000 cpm • 500,000 - 1,000,000 cpm Mine Site Boundary General Slope Direction Observed Reclamation Feature Observed Waste Pile '-Jt ,'JJN -iJjL % % Steep Grade Measured as counts per minute (cpm) Average background 12,882 cpm /^7Sx r O 'i\ I Feet 300 * * •#- r ^ficr+3ron*333 ------- |