HRS Documentation Record Jackpile

- Paguate Uranium Mine
NMN000607033 

### HAZARD RANKING SYSTEM (HRS)
DOCUMENTATION RECORD - REVIEW COVER SHEET

Name of Site: Jackpile

- Paguate Uranium Mine

EPA ID No.: NMN000607033

Contact Persons

Site Investigation: Brenda Nixon Cook, NPL Coordinator, EPA Reg.6 (21 4) 665-7436 (Name) (Telephone)

Documentation Record: Brenda Nixon Cook, NPL Coordinator, EPA Reg.6 (214) 665-7436 (Name) (Telephone)

Pathways, Components, or Threats Not Scored

1) Ground Water Pathway: The ground water migration pathway has not been scored because although there is analytical data to support a release, there is not a sufficient number of targets to impact the site score

. Based on information available at this time, evaluation of the ground water migration pathway would not affect the listing decision.

2) Ground Water to Surface Water Pathway: The ground water to surface water pathway has not
been scored because although ground water in the Jackpile Sandstone interchanges with water in the Rio Moquino and Rio Paguate through unconsolidated alluvium deposits along the

st r eam channels, the overland flow component score was sufficient for site listing

.

3) Soil Exposure Pathway: The soil exposure pathway has not been scored

. Based on information
available at this tim e, evaluation of the soil exposure pathway would not affect the listing
decision.

4) Air Pathway: The air migration pathway has not been scored. Based on information available at this time, evaluation of the air migration pathway would not affect the lis ting decision.

5) Surface Water Pathway: The drinking water and environmental threat s have not been scored. Based on information available at this time, evaluation of the drinking water and environmental
threat s would not affect the listing decision.HRS Documentation Record
December 2013 

### 1 Jackpile

- Paguate Uranium Mine

NMN000607033 

### HRS DOCUMENTATION RECORD

Name of Site: Jackpile

- Paguate Uranium Mine

Site Spill Identifier No.: A6 T3

CERCLIS Site ID No.: NMN000607033

EPA Region: 6

Date Prepared: March 2012
Date Revised: D ecember 2013

Street Address of Site: SR279 n ear Pag uate, Laguna Pueblo

City, County, and State: Paguate , Cibola County, New Mexico 87040*

General Location
within the State: The site is located near the city of Paguate , Cibola County, New Mexico

. Paguate is located in the Laguna Indian Reservation appro ximately 40 miles west of Albuquerque (Ref. 3, p. 1).

Topographic Map(s): The following U.S. Geological Survey (USGS) 7.5-minute topographic series map was used in locating the site: Moquino, New Mexico (19 57 ) (Ref. 3, p. 1).

Latitude *: 35° 8 ’ 1.42” North Longitude*: 107° 20 ’ 50.54 ” West

Latitude and Longitude coordinates were measured at the point of convergence of Rio Paguate and Rio Moquino near the center of the former mine and were determined using a scaled aerial photograph and ESRI ArcMap software (Ref. 9, p. 1).
Scores

Air Pathway Not Scored Ground Water Pathway Not Scored Soil Exposure Pathway Not Scored Surface Water Pathway 100.00

HRS SITE SCORE 50.00

*The street address, c oordinates, and contaminant locations presented in this HRS Documentation R ecord identify the general area in
which the site is located. They represent one or more locations EPA considers to be part of the site based on the screening inform ation
EPA used to evaluate the site for NPL listing. EPA lists national priorities among the known "releases or threatened releases" of hazardous substances; thus, the focus is on the release, not precisely delineated boundaries. A site is defined as where a hazardous substance has been "deposited, stored, placed, or otherwise come to be located." Generally, HRS scoring and the subsequent l isting of a release merely represent the initial determination that a certain area may need to be addressed under CERCLA. Accordin gly, EPA contemplates that the preliminary description of facility boundaries at the time of scoring will be refined as more information is developed as to where the contamination has come to be located.HRS Documentation Record 

### 2 Jackpile

- Paguate Uranium Mine

NMN00 0607033 

### NOTES TO THE READER

1. The following rules were applied when citing references in this documentation record:

Tracking numbers are assigned by the region to every page of every reference. The tracking number consists of the reference number followed by the page number within that reference. A tracking number has a two

- digit number followed by the sequential number (e.g., Reference 4, page 1 is expressed as 040001 in Reference 4).

2. Hazardous substances are listed by the names used in the January 2004 Superfund Chemical Data Matrix (SCDM) (Ref. 2).

3. Attachment A of this document record consists of the following figures:

• A-1 Site Location Map

• A-2 Site Layout Map

• A-3 Surface Water Pathway

• A-4 15- Mile Target Distance Limit

• A-5A Site Inspection Sample Location Map

• A- 5B Expanded Site Inspection Samp le Location Map

### REFERENCES CITED

1. 40 Code of Federal Regulations (CFR) Part 300 Appendix A , Hazard Ranking System. Pages:

1. [A complete copy can be obtained from the Regional Docket upon request or found online at http://www.epa.gov/superfund/sites/npl/hrsres/index.htm#HRS Rule ].

2. U.S. Environmental Protection Agency (EPA). 2004. Superfund Chemical Data Matrix (SCDM) (excerpts). January 2004. Pages: 23. [A complete copy of SCDM is available at http://www.epa.gov/superfund/sites/npl/hrsres/tools/scdm.htm ].

3. U.S. Geological Survey (USGS). 19 57, Moquino, New Mexico ; 1957, photorevis ed 1971, Mesita, New Mexico; 1960, photorevised 1971, Dough Mountain, New Mexico, (7.5

- minute
topo graphic series maps). Pages: 3.

4. U.S. Department of the Interior. Jackpile

- Paguate Uranium Mine Reclamation Project Environmental Impact Statement. Volum e 1. October 1986 . Pages: 276.

5. OA Sys tems Corporation. Jackpile

- Pag uate Uranium Mine Record of Decision Compliance Assessment. September 2007. Pages: 219.

6. Marvin Sarracino, Technician II. Jackpile Reclamation Project. Pueblo of Laguna. Project

Sta tus Report No. 71. June 1995. Pages 58.

7. Hydro

- Search, Inc. Hydrology of the Jackpile

- Paguate Mine Area. October 9, 1981. Pages:

111.

8. Weston Solutions, Inc. Quality Assurance Sampling Plan for Jackpile

- Paguate Uranium Mine

. SR 279 Laguna Pueblo, Paguate, Cibola County, New Mexico. February 2010. Pages: 143.

9. Weston Solutions, Inc. Project Note to Project File. Calculating the Latitude and Longitude at Jackpile

- Paguate Uranium Mine. 24 June 2010. Pages: 2.

10. EPA . Technical Resource Docume nt. Extraction and Benefication of Ores and Minerals. Uranium. Volume 5. January 1995. Pages: 139.

11. EP A . Standards for Interstate and Intrastate Waters, 20.6.4 NMAC, 2005. Effective 29
December 2006. http://www.epa.gov/waterscience/standards/wqslibrary/nm/nm_6_wqs.pdf Accessed 5 April 2010. Pages: 46.

12. Weston Solutions, Inc. Project Note to Project File. Calculating Distance from PPE s to Level

II Samples RM

- JM

- SW, RP

- JM -01, RP- SW

- 01, RP

- SW

- 02, RP

- SW

- 03, PR

- SW

- 01. 11 March 2010, updated 18 October 2013. Pages: 2.

13. EPA. Toxics Release Inventory Program. www.epa.gov/TRI/ . TRI Explorer search conducted
for zip code 87040. 2009 Public Data , accessed 12 March 2010. Pages: 1.

14. OA Systems Corporation. Jackpile

- Paguate Uranium Mine Record of Decision Compliance

HRS Documentation Record

D ec ember 2013 

### 3 Jackpile

- Paguate Uranium Mine

NMN000607033HRS Documentation Record 

### 4 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Assessment

. Appendix D Water Quality, WQ Addendum and Monitoring Result Tables (excerpts)

. Surface Water Results. September 2007. Pages: 14.

15. Weston Solutions, Inc. Project Note to Project File. Calculating Average Annual Flow for Rio Paguate and Rio San Jose. Using data from USGS Surface

- Water Annual Statistics for the Nation ( http://nwis.waterdata.usgs.gov/nwis/annual/ ). 25 June 2010. Pages: 6.

16. Missouri Census Data Center Demographic Profile 3, 2000 Census

– Paguate. http://mcdc2.missouri.edu , accessed 15 March 2010. Pages: 4.

17. Reference number reserved.

18. Kaufman n , Robert, Eadie, Gregory, and Russel l , Charles. Effects of Uranium Mining and Milling on Ground Water in the Grants Mineral Bel t, New Mexico. Ground Water, September

October 1976, Vol. 14, No. 5. Pages: 13.

19. Weston Solutions, Inc. Field Logbooks. WO# 20406.012.019.0514.01. Field Logbook Notes for Jackpile

- Paguate Uranium Mine. Logbooks 1 through 3. 17 February 2010 to 4 M arch 2010. Pages: 41.

20. ALS Laboratory Group. Final Analytical Data Packages. ALS Work Order Numbers 10-03-045
and 10-03-063. 16 March 2010 . Pages: 1317.

21. OA Systems Corporation. Jackpile

- Paguate Uranium Mine Record of Decision Compliance

Assessment. Appendix D Water Quality, WQ Addendum and Monitoring Result Tables (excerpts). Monitoring Well Results. September 2007. Pages: 12.

22. United States Department of Agriculture. Soil Survey of Cibola Area, New Mexico, Parts of Cibola, McKinley, and Valencia Counties. Issued March 1993. Pages: 309.

23. Pueblo of Laguna Environmental and Natural Resources Department. Memorandum from
Curtis F r ancisco , Water Quality Specialist. Subject: Fishing in the Rio Paguate and Rio San Jose. 15 March 2010. Pages: 2.

24. EPA. Soil Cleanup Criteria in 40 CFR Part 192. Directive No. 9200.4

- 25. Use of Soil Cleanup Criteria in 40 CFR Part 192 as Remediation Goals for CERCLA Sites. 12 February
1998. http://www.epa.gov/superfund/health/conmedia/soil/cleanup.htm . Accessed 24 March

2010. Pages: 5.

25. Weston Solutions, Inc. Data Quality Assurance Review. ALS Laboratory Group. SDGs 1003045 and 1003063. 19 March 2010. Pages: 81.

26. Weston Solutions, Inc. Review of Radiochemistry Data Reports. Work Orders 1003 0 45 and 1003063. 24 March 2010. Pages: 3.

27. Pueblo of Laguna Environmental and Natural Resource Department. Year End Program Report FY09, Surface Water Monitoring Program. February 2010 . Pages: 385.HRS Documentation Record

Dec embe r 2013 

### 5 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 28. Pueblo of Laguna. Jackpile Project, Jackpile Area. Drawings. Jacobs Engineering Group, Albuquerque Operations. August 1989. Pages: 46.

29. Pueblo of Laguna. Jackpile Reclamation Project. OA Systems Corporation. Exhibit 2 Jackpi le

- Paguate Uranium Mine, Record of Decision Compliance Assessment. May 2007. Pages: 1.

30. Weston Solutions, Inc. Site Inspection Report for Jackpile

- Paguate Uranium Mine. SR 279 Laguna Pueblo, Paguate, Cibola County, New Mexico (excerpts). June 2010. Pages: 91

.

31. Weston Solutions, Inc. Project Note to Project File. Observations of Source Areas during 18 February Site Reconnaissance and 2 through 4 March 2010 Site Inspection Sampling Event. 1 July 2010. Pages: 1.

32. Weston Solutions, Inc. Project No te to Project File. Sample Quantitation Limit (SQL) Calculation. 1 July 2010. Pages: 2.

33. Weston Solutions, Inc. Project Note to Project File. Source Area Measurements. 14 October

2011 . Pages: 3.

34. EPA. Using Qualified Data to Document an Observed Release and Observed Contamination. EPA 540-F-94-028. November 1996. Pages 18.

35. Weston Solutions, Inc. Draft Expanded Site Inspection Report for Jackpile

- Paguate Uranium Mine. SR 279 Laguna Pueblo, Paguate, Cibola County, New Mexico (excerpts). Jul y 2011. Pages: 2896.

36. Weston Solutions, Inc. Trip Report for Jackpile

- Paguate Uranium Mine Expanded Site Inspection. SR 279 Laguna Pueblo, Paguate, Cibola County, New Mexico (excerpts). 3 June 2011. Pages: 28.

37. Reference number reserved.

38. EPA. T echnology Reference Guide for Radioactively Contaminated Media. EPA 402 -R-07- 004 (excerpts). October 2007. Pages: 25.

39. EPA. Radiation Protection. Frequent Technical Questions.

www.e pa.gov/radiation/marssim/faqforusers.html Accessed 19 August 2011. Pages 8.

40. Weston Solutions, Inc. Project Note to Project File. Overland Flow Distance Measurements

. 17 October 2011, updated 21 October 2013. Pages: 2.

41. Pueblo of Laguna Environme ntal and Natural Resources Department. Record of Communication between Frank A Ortiz, Natural Resources Specialist, and Stacey Carr, of Mesita Village. Subject: Fishing in the Rio Paguate. 24 October 2011. Pages: 1.

### 42. Pueblo of Laguna Environmental and Natural Resources Department. Memorandum from
Curtis L. Francisco, Water Quality Specialist. Subject: Cultural Use on the Rio Paguate and Rio Moquino above and below the Jack Pile Mine site. 20 December 2012 . Pages: 5.

43. Weston Solutions, Inc. Tele phone Conversation Record for communication between Michelle

Brown

, Weston Solutions, Inc., and Curtis L. Francisco

, Pueblo of Laguna. Subject: Sample
location JM- SS -03 and Rio Moquino. 27 February 2013. Pages: 1.

HRS Documentation Record

Dec ember 2013 

### 6 Jackpile

- Paguate Uranium Mine

NMN000607033HRS Documentation Record

Dec ember 2013 

### 7 Jackpile

- Paguate Uranium Mine

NMN000607033 

### SITE SUMMARY

The Jackpile

- Paguate Ur anium Mine site is located on the Laguna Indian Reservation about 40 miles west of Albuquerque in Paguate, Cibola County, New Mexico (Ref. 3 , p. 1 ; Ref. 4 , p . 21) . The
property is located in an area of canyons and arroyos to the east of the village of Paguate as seen on Figure A- 1 (Ref. 3, p. 1). The former uranium mine facility encompasses approximately 7,868 acres and includes the following sources: open pits and waste dumps. Overburden and ore

- associated waste

was stockpiled within the mine are a , stockpiled in an adjacent river’s (Rio Moquino) floodplain, or placed in the mined

- out areas of the pits as backfill (Ref. 4, pp. 21, 69). The sources at the property (the open pits, and the waste dump) contain hazardous substances that have released into th e surface waters of Rio Paguate , and Rio Moquino via the surface water pathway (described below). The open pits (identified as Source 1 below) are not scored in the overland/flood migration component of the surface water migration pathway, but do constitu te an eligible source for the ground water to surface water migration component of the surface water migration pathway (a component described in th is HRS documentation record at proposal, but not scored ). These releases of hazardous substances have

cause d Level II contamination within fisheries identifie d within the Rio Paguate and Paguate
Reservoir.

For the purpose of this HRS Documentation Record, the “ property ” is defined as approximately 2,656
acres of the facility which were disturbed and contained th ree open pits that were between 200 and 300 feet deep , 32 waste dumps and 23 protore stockpiles (Ref. 4 , p. 2 4 ; Ref. 5 , p. 184)

. A Site Layout Map is provided as Figure A-2 and the locations of the disturbed areas can been found in References
28 and 29

. The mine was operated by Anaconda Minerals Company, a division of Atlantic Richfield Company. Mining operations were conducted from 1953 through early 1982. The mine was closed because of depressed uranium mining conditions. During the 29 years of mining, approximately 400
million tons of rocks were moved within the mine area and approximately 25 million tons of uranium ore were transported via the Santa Fe Railroad from the mine to Anaconda’s Bluewater Mill, approximately 40 miles west of the property (Ref. 4, p. 21 ; Ref. 5, p. 11 ).

The town of Paguate is located adjacent and west of the property with a population of approximately
492 according to the 2000 census ( Ref. 3, p.1; Ref. 16 , p. 1) . The remaining surrounding area is mainly undeveloped, and a varied topography that contains wildlife consisting of elk, antelope, goats, and mule deer. There is also a population of approximately 1

, 500 domesticated cattle on the Laguna Reservation ( Ref. 3, p.1; Ref. 19, pp. 6, 7 ). As depicted on a USGS topogr aphic map of the area, t he perennial rivers Rio Moquino and Rio Paguate flow through the property boundary and the two rivers

merge near the center of the property (Ref. 3, p. 1, Figure A

- 2). Tribal members use the Rio Paguate and Rio Moquino upst ream an d downstream of the mine area for cultural, ceremonial, and traditional

purposes (Ref 42, p. 1 ). The taking of water fowl has been observed on a routine and continuing basis (Ref. 23, p. 2)

. Also, wild plants that grow along these waterways are collected a nd consumed and used for basketry, and wood from the trees is used to heat home s and cook with in wood stoves and outside ovens (Ref. 42, p. 5 ). According to Laguna officials, contaminated source material is present along the river bank and would be in di rect contact with the sources when the river is flowing (Ref. 19

, pp. 4, 6, 7 )

. The Rio Moquino flows southeasterly into the Rio Paguate within the property and the Rio Paguate continues to flow south of the property through the Paguate Reservoir and then becoming

t he Rio San Jose (Ref. 3 , p p. 1 to 3). There is documentation of fishing occurring within these perennial rivers and that the fish are used for human consumption (Ref. 23, Ref. 41 ).HRS Documentation Record 

### 8 Jackpile

- Paguate Uranium Mine

NMN000607033 

### In December 1986, under a series of agreements between the Bureau of Indian Affairs (BIA) and the Pueblo of Laguna, it was agreed that the Pueblo of Laguna would perform the management, coordination, and administration of the Jackpile

- Paguate Reclamation Project in accordance with the requirements set forth in the Jackpile

- Paguate Environmental Impact Statement (EIS) and the associated Record of Decision (ROD) (Ref. 5, p. 184).

Reclamation of the Jackpile

- Paguate Uranium Mine commenced in 1990. The “preferred alternative” reclamation plan incorporated the followin g: backfilling of the open pit areas to at least 10 feet above projected ground water recovery levels using protore and waste rock dump material; slope reduction of the upper 15 feet of highwall slopes; recontouring and covering of remaining waste rock dum ps; completion of arroyo drainage improvements and erosion controls; decontamination of those structures to remain, and removal/disposal of all non

- essential structures; plugging and bulkheading of underground ventilation raises and decline portals, respec tively; reclamation of miscellaneous features such as wells, access roads, rail spur s, drill holes, etc .; property- wide revegetation of disturbed areas;
and provision of property security and long

- term monitoring of reclamation success for a period of not
less than 10 years (Ref. 5, p. 12).

On 10 June 1995, the Laguna Construction Company, who was in charge of the reclamation, officially closed out the Jackpile Reclamation Project (Ref. 6, p. 57).

In September 2007, a ROD Compliance Assessment for Jackpil e- Paguate Uranium Mine was completed by OA Systems Corporation to determine if the post

- reclamation had met the requirements
of the ROD. This report concluded that reclamation of the mine was still not complete as several non

compliant and potentially non

- compliant issues still needed to be addressed (Ref. 5, pp. 80 to 92). The mine would be considered complete when revegetated sites reached 90 percent of the density, frequency, foliar cover, basal cover, and production of undisturbed reference areas (but no sooner than 10 years following seeding) (Ref. 5, p. 92).

As part of the ROD Compliance Assessment, surface water data were evaluated for 10 years between
1996 and 2006 (Ref. 5, p. 191). During this evaluation, several samples were found to exceed E PA Maximum Contaminant Levels (MCLs) for drinking water for total uranium at 0.03 milligram per liter ( mg/L ) and National Secondary Drinking Water Standards of 0.05 mg/L for manganese (Ref. 5, pp. 200 to 202). The following concentration ranges were found in samples collected during this
timeframe:

Total Uranium Manganese
Location Concentrations Concentrations Reference mg/L mg/L Rio Paguate

– Ford 0.08

- 544.14 <0.01

- 10.7 Ref, 5, p. 191, Crossing

- Rail Trestle Ref. 14, p. 6 Lower Rio Moquino 0.03

- 2 34.95 0.0089

- 0.127 Ref, 5, p. 191; Ref. 14, p. 7 Lower Rio Paguate 0.016

- 163.25 0.0357

- 0.13 Ref, 5, p. 191; Ref. 14, p. 8 Paguate

- Moquino 0.029

- 252.59 0.0112

- 0.14 Ref, 5, p. 191;
Confluence Ref. 14, p. 9 Upper Rio Moquino 0.008

- 52.89 <0.01

- 0.036 Ref, 5, p. 191; Ref. 14, p. 10HRS Documentation Record 

### 9 Jackpile

- Paguate Uranium Mine

NMN000607033 Upper Rio Paguate 0.002

- 32.21 0.0396

- 0.146 Ref, 5, p. 191; Ref. 14, p. 11 Paguate Reservoir 0.002

- 17.42 <0.01

- 0.004 Ref, 5, p. 191; Ref. 14, p. 12

Note:

< - Less Than



### As part of the Water Pollution Program Grants (Section 106), the Pueblo of Laguna Environmental and Natural Resources Department has been collecting surface water samples along the surface water pathway quarterly from 2005 through 2009 (Ref. 30, p. 39). The samples have been analyzed for tota l
uranium (Ref. 27, p. 23)

. As with the samples collected as part of the ROD Compliance Assessment, these samples also contain concentrations that exceed the EPA MCL of 0.03 mg/ L or 30 microgram s per liter (ug/L). The following concentration ranges were found in the samples collected:

Location Total Uranium
Concentrations ug/L Reference

RPG

- 03 Rio Paguate below the former Jackpile

- Paguate Mine (within the TDL) 0.007
- 452.557 Ref. 27, pp. 23, 43

RPG

- 04 Rio Paguate at Mesita Dam (within the TDL) 0.167
- 217.45 Ref. 27, pp. 23, 43

RSJ

- 04
Rio San Jose below the Dipping Vat Spring on Sedillo Grant (beyond the TDL) 2.012
- 21.615 Ref. 27, pp. 23, 43

RMQ

- 01 Rio Moquino above Jackpile

- Paguate Mine (background) 0.005
- 31.138 Ref. 27, pp. 23, 43



### These results indicate contamination within the surface water pathway, but according to the ROD Compliance Assessment, several data gaps remained and it was recommended that further monitoring and evaluation be performed (Ref. 5, pp. 204 to 206).

Post-r eclamat ion land uses for the property include limited livestock grazing, light manufacturing, office space, mining

, and major equipment storage. Specifically excluded are habitation and farming (Ref. 5, p. 79 ).

Based on analytical results from the Site Inspecti on (SI) conducted in March 2010 (whose results are presented in this HRS Documentation Record), there is an observed release of uranium 234 

### , uranium 235



### , uranium 238 

### [the main components of total uranium] and manganese to Rio Paguate, Rio Moquino and the Paguate Reservoir (Ref. 30, pp. 42, 43). This release resulted in Level II contamination of two fisheries within the Rio Paguate and the Paguate Reservoir ; the zone of actual contamination extend s approximately 5. 26 miles downstream from the probable point of entry to surface water to the most downstream sample establishing an observed release within the surface water migration pathway (seeHRS Documentation Record

D ec ember 2013 

### 10 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Section 4.1.3.3).

The EPA decided to complete an Expanded Site Inspection (ESI) of the Site in January 2011 . As part of the ESI, a draft Conceptual Site Model (CSM) was prepared based primarily on the data and
conclusions of the SI and other historical facility reports. The purpose of the CSM was to compile the existing hydrologic and geochemical data for the property (Ref. 35 , p. 2)

. Based on the CSM, it was concluded that ground water and surface water are in hydrologic communication across the property. Hydrologic observations and modeling indicate that pit waters present on the property are not contained and flow i nto the surface water system via ground water pathways, carrying contaminants into that system (Ref. 35, p. 2795) . Chemical data also suggest that reactions in the backfilled pits, and subsequent migration to ground water , may be shifting the chemistry of surface water at, and below the
property (Ref. 35, p. 2795).

In April 2011, ESI sampling activities were conducted. ESI sampling activities focused on both ground water and surface water sampling

. Analytical results from the ESI (whose results are prese nted in this HRS Documentation Record) document an observed release of isotopic uranium, and

manganese to the surface water pathway (Ref. 35 , p p. 3, 30, 33).

### WORKSHEET FOR COMPUTING HRS SITE SCORE

S S 2



### 1. Ground Water Migration Pathway Score (S gw 

### ) NS NS (from Table 3 -1, line 13)

2a. Surface Water Overland/Flood Migration Component 100 10,000 (from Table 4 -1, line 30)

2b. Ground Water to Surface Water Migration Component NS NS (from Table 4 -25, line 28)

2c. Surface Water Migration Pathway Score (S
sw 

### ) NS NS (Enter the larger of lines 2a and 2b as the pathway score)

3. Soil Exposure Pathway Score (S
s 

### ) NS NS (from Table 5 -1, line 22)

4. Air Migration Pathway Score (S
a 

### ) NS NS (from Table 6 -1, line 12)

5. Total of S 2 

### + S 2 

### + S 2 2
gw sw s 

### + S
a 

### ---- 10,000

6. HRS Site Score: Divide the value on line 5 by 4 and take 50.00 the square root.

Notes :

S Score

S 2 Score squared

NS N ot scored

Tables 3

- 1, 4

- 1, 4

- 25, 5

- 1, and 6

- 1 refer to score sheets presented in the HRS (Ref. 1). Table 4- 1 is reproduced in the following pages of this HRS documentation record for the convenience of the reader.

HRS Documentation Record 

### 11 Jackpile

- Paguate Uranium Mine

NMN000607033HRS Documentation Record

D ec ember 2013 

### 12 Jackpile

- Paguate Uranium Mine

NMN000607033 DRINKING WATER THREAT



### Factor Categories and Factors Maximum Value Value Assigned

Likelihood of Release

1. Observed Release 550 550

2. Potential to Release by Overland Flow:

2a. Containment 10 NS
2b. Runoff 25 NS

2c. Distance to Surface Water 25 NS
2d. Potential to Release by Overland Flow (lines 2a[2b + 2c]) 500 NS

3. Potential to Release by Flood:
3a. Containment (Flood) 10 NS
3b. Flood Frequency 50 NS

3c. Potential to Release Flood (lines 3a x 3b) 500 NS

4. Potential to Release (lines 2d + 3c, subject to a maximum of 500) 500 NS
5. Likelihood of Release (higher of lines 1 and 4) 550 550

Waste Characteristics

6. Toxicity/Persistence a 10,000

7. Hazardous Waste Quantity a 10 ,000

8. Waste Characteristics (Toxicity/Persistence x Hazardous Waste Q uantity, then assign a
value from Table 2

- 7) 100 100 Targets

9. Nearest Intake 50 NS

10. Population

10a. Level I Concentrations b NS

1 0b. Level II Concentrations b NS

10c. Potential Contamination b NS
10d. Population (lines 10a + 10b + 10c) b NS

11. Resources 5 5

12. Targets (lines 9 + 10d +11) b 5 Drinking Water Threat Score

13. Drinking Water Threat Score [(lines 5 x 8 x 12)/82,500 subject to a maximum of 100] 100 3.33HRS Documentation Record

D ec ember 2013 

### 13 Jackpile

- Paguate Uranium Mine

NMN000607033 HUMAN FOOD CHAIN THREAT



### Factor Categories and Factors Maximum Value Value Assigned

Likelihood of Release

14. Likelihood of Release ( Same value of line 5) 550 550

Waste Characteristics

15. Toxicity/Persistence/ Bioaccumulation a 5x10 8

16. Hazardous Waste Quantity a 10 ,000

17. Waste Characteristics (Toxicity/Persistence/Bioaccumulation x Hazardous Waste Q uantity, then assign a
value from Table 2

- 7) 1,000 1,000

Targets

18. Food Chain Individual 50 45
19. Population
19a. Level I Concentrations b 0
19b. Level II Concentrations b 0 .03
19c. Potential Human Food Chain Contamination b 0.003
19d. Population (lines 19a + 19b + 19c) b 0.0 33
20. Targets (lines 18 + 19d) b 45

. 033

Human Food Chain Threat Score

21. Human Food Chain Threat Score [(lines 14 x 17 x 20)/82,500 subject to a maximum of 100] 100 100HRS Documentation Record 

### 14 Jackpile

- Paguate Uranium Mine

NMN000607033 ENVIRONMENTAL TH REAT - Not Scored (NS)



### Factor Categories and Factors Maximum Value Value Assigned

Likelihood of Release

22. Likelihood of Release (Same value of line 5) 550 550

Waste Characteristics

23. Ecosystem Toxicity/Persistence Bioaccumulation a NS

24. Hazardous Waste Quantity a NS
25. Waste Characteristics (Ecosystem Tox./Persistence x Bioaccumulation x Hazardous Waste Quantity, then assign a
value from Table 2

- 7) 1,000 NS

Targets

26. Sensitive Environments
26a. Level I Concentra tions b NS
26b. Level II Concentrations b NS

26c. Potential Contamination

26c. Potential Contamination b NS
26d. Sensitive Environments (lines 26a + 26b + 26c) b NS
27. Targets (value from line 26d) b NS

Environmental Threat Scor e

28. Environmental Threat Score [(lines 22 x 25 x 27)/82,500 subject to a maximum of 60] 60 NS

SURFACE WATER OVERLAND/FLOOD MIGRATION COMPONENT SCORE FOR A WATERSHED

29. Watershed Score [(Lines 13 + 21+ 28), subject to a maximum of 100] 100 100

SURFACE WATER OVERLAND/FLOOD MIGRATION COMPONENT SCORE

30. Component Score (Highest score from Line 29 for all watersheds evaluated, subject to a maximum of 100) 100 100Source Characterization
- Source 1

HRS Docum entation Record

D ec ember 2013 

### 15 Jackpile

- Paguate Uranium Mine

NMN000607033 

### SOURCE DESCRIPTION

2.2 Source Characterization

Sour ce Description: Source 1

– Open Pits

Mining operations at the Jackpile

- Paguate Uranium Mine resulted in approximately 2,656 acres of surface disturbance, of which the open p its accounted for approximately 1, 015 acres (Ref. 4, pp. 24, 59). The location of this source is depicted on Figure A-2 and features of the open pit can be found in
References 28 and 29.

Mining operations were conducted from 1953 through early 1982 from three open pits , Jackpile, North Paguate, and South Paguate that were between 200 and 300 feet deep. Open pit mining was conducted predominantly with large front

- end loaders and haul trucks. The uranium ore was segregated according to grade and stockpiled for shipment to the mill. Overburden and ore

- associated waste was placed in the mined

- out areas of the pits as backfill (Ref. 4, p. 21; Ref. 5, p. 184; Ref. 28 ).

The Jackpile, North Paguate, and South Paguate open pits make up approximately 40 percent of the total disturbed acreage at the mine (see Figure A- 2 and References 28 and 29). During th e later years of mining, some overburden was placed into the mined

- out portions of the pits. Approximately 101 million tons of backfill composed principally of ore

- associated waste with some overburden have been returned to the pits (Ref. 4, p. 56, 69 ). The southern portion of the Jackpile Pit and the South Paguate Pit received most of this material. There were no requirements to keep records on the radiological content of the backfill material (Ref. 4, p. 69).

As stated above, the wastes generated at Jackpile

- Paguate Uranium Mine were not removed from the facility but used for backfill. There was no impermeable cap placed on top of the backfill other than 3 feet of overburden (material removed during surface mining and stockpiled) and 2 feet of topso il (Ref. 4, p. 64; Ref. 5, p. 7; Ref. 31, p. 1 ).

The three pits are being aggregated into one source within this HRS documentation record because they are all the same source type (piles), have the same target (as described in Section 4.1.3.3 of this

repo rt), have the same containment (as described below), contain the same hazardous substances (as described in Section 2.4.1) and affect surface water in the same watershed via the ground water to surface water migration component (see Section 4. 2 ). In addit ion, radiological analytical results from
the ESI show elevated concentrations of gross alpha and gross beta (Ref. 35, pp. 3, 30, 33).

Source Type

The waste contents were contained within the former open pit uranium mine, which over the 29 years of operation, accumulated piles of contamination (Ref. 4, p. 24; Ref. 5, p. 11). These piles of
contamination were not removed from the facility , but used to backfill the open pits . The backfill material consists of protore and waste dumps, and as such, the sour ce type for Source 1 is “Pile” (Ref. 1, Table 2-5; Ref. 5, p. 7).

Source LocationSource Characterization
- Source 1

HRS Docum entation Record

D ec ember 2013 

### 16 Jackpile

- Paguate Uranium Mine

NMN000607033 

### The Jackpile P it is located along the eastern side of the mine starting at the north side and continuing about midway down the facility , the North Paguate P it is located o n the north western side of the facility , and the South Paguate Pit is located on the southwest corner of the facility (Ref. 29, p. 1).

Source Containment

Release To Ground Water

Contents of the three open pits are exposed to the elements

. T here is no maintained engineered cover, liner, and a run

- on control system and runoff management system (Ref. 31, p. 1). The open pits
remained as close d basins and were covered with just 3 feet of overburden and 2 feet of topsoil, and although required as part of the ROD, no berms were placed to control surface runoff ( Ref. 3, p. 1; Ref. 5, p. 7; Ref. 7, p. 10).

A ground water containment value of 10 was selected for Source 1 because there is no liner (Ref. 1,
Section 3.1.2.1 ).

Ground Water Containment Value: 10
2.4.1 Hazardous Substances

On 03 and 04 March 2010, as part of the Site Inspection (SI) of the Jackpile

- Paguate Uranium Mine facility , the EPA Region 6 Superfund Technical Assessment Response Team (START

- 3) contractor,
collected the following sour ce samples at the Jackpile

- Paguate Mine : one solid waste sample, JM

- SS

01 , collected from the South Paguate Pit : one solid waste sample ( JM

- SED -02 ) and one liquid waste sample (JM

- SW

- 02), collected from the North Paguate Pit ; and one solid waste sample, JM

- SS

- 05 collected from the Jackpile Pit ( Ref. 8, Figure 3-1 ; Ref. 19, pp. 2, 8, 20, 21, 35; Ref. 29; Figure A-2 ).
The solid waste samples are considered appropriate source samples due to the presence of
contamination in the waste rock used to backfill the open pits. The liquid waste sample (collected from sample location JM -02) is also considered an appropriate source sample because this former open pit continues to fill with water; this sample further demonstrate s the presence of contamination
associated with the open pits.

On 19 through 21 April 2011, as part of the ESI of the Jackpile

- Paguate Uranium Mine property , the

START

- 3 contractor collected subsurface source samples from the Jackpile, (JPOP41S), North Paguate (NPOP20E), and South Paguate (SPOP35) open pits at the Jackpile

- Paguate Mine (Ref. 35, pp. 23, 26, 78-81, 119 ).

The solid and liquid waste samples were collected according to the EPA approved Quality Assurance Sampling Plan s (QASP s) (Ref. 30, p. 18 ; Ref. 35 , p p. 111-113) . The solid wast e samples were collected with disposable plastic scoops, and then transferred to an 8

- ounce sample container (Ref. 8, pp. 15, 17; Ref. 35, pp. 222 ). The surface liquid waste sample was collected by submerging the sample container into the liquid , facing t he mouth of the container upstream while sampling personnel stood downstream (Ref. 8, p. 113; Ref. 35 p. 216 ). The subsurface source samples were collected using low flow sampling techniques and a pneumatic pump (Ref. 35, pp. 78-81, 113 ).

A total of 6 so urce samples were collected from former open pit locations within the mine areaSource Characterization
- Source 1

HRS Documentation Record 

### 17 Jackpile

- Paguate Uranium Mine

NMN000607033 

### including two solid waste sample s , one liquid waste sample , and three subsurface water samples . The samples collected in March 2010 were shipped via Federal Express to ALS Lab oratory Group located in Fort Collins, Colorado (Ref. 8, p. 16; Ref. 19, pp. 11, 13). The samples were analyzed for total metals by EPA Methods SW

- 846 3005A(liquid) 3050B (solid) and 6010B, total cyanide by EPA
Methods SW

- 846 9010 and 9014, mercury by EPA Methods SW

- 846 7470A/7471A and SOP812 Rev. 14, and isotopic uranium by SOP778R13 and SOP714R11 (Ref. 20, pp. 13, 51, 542, 720, 758, 1170). The April 2011 samples were analyzed for: isotopic u ranium (isotopes 234, 235, and 238) by method
Eichrom ACW -03- 15 and ACW

- 10; total metals by EPA method 200.7 for water and 6010B for solids; selenium by EPA method 6020; mercury by EPA method 7470A/7471A; Radium 226 

### by EPA method 903; and Radium 228 

### by EPA method 904. In addition, all water samples were also analyzed
for: a lkalinity by method SM2310

- B; b icarbonate by method SM

- 17 2320; c arbonate by method SM
4500- CO2D; Total Dissolved Solids by method SM 2540

- C; and a nions by EPA method 300 (Ref. 35

, pp. 336- 414, 437

- 446, 756 -780 ; Ref. 36, pp. 4 -5 ). Once final analytical results were received, the data
underwent a third

- party data review and validation performed by a START

- 3 chemist or professional health physicist (for radiological data) not associated with the sampling conducted at the facility (Ref. 8; Ref. 25 ; Ref. 36, p. 5 ).

Analytical eviden ce of the contamination in open pit source samples associated with the mine operations at the Jackpile

- Paguate Uranium Mine facility are summarized as follows:

Source 1 Radioactive Results

Hazardous
Substance Evidence

Station
Location No. Concentration Reporting
Limit 2 /

MDC/LOD 1 Units Ref erences

EPA Site Inspection Activities

– March 2010 3

234 Uranium

JM

- SS

- 01 0.00173 0.0 ug/g Ref. 19, p. 23; pp. 1 to 3 Ref. 20, pp. 714, 1218; Ref. 26,

235 Uranium 0.343 0.015 ug/g Ref. 19, p. 23; pp. 1 to 3 Ref. 20, pp. 714, 1218; Ref. 26,

238 Uranium 40.8 0.1 ug/g Ref. 19, p. 23; pp. 1 to 3 Ref. 20, pp. 714, 1218; Ref. 26,

234 Uranium

JM

- SED

- 02 0.0224 0.0 ug/g Ref. 19, p. 35; pp. 1 to 3 Ref. 20, pp. 712, 1209; Ref. 26

235 Uran ium 2.62 0.03 ug/g Ref. 19, p. 35; pp. 1 to 3 Ref. 20, pp. 712, 1209; Ref. 26

238 Uranium 367 0.0 ug/g Ref. 19, p. 35; pp. 1 to 3 Ref. 20, pp. 712, 1209; Ref. 26

234 Uranium

JM

- SW

- 02 0.538 0.0 ug/g Ref. 19, p. 35; pp. 1 to 3 Ref. 20, pp. 712, 1211; Ref. 26

235 Uranium 61 1.0 ug/g Ref. 19, p. 35; pp. 1 to 3 Ref. 20, pp. 712, 1211; Ref. 26

238 Uranium 8,500 0.0 ug/g Ref. 19, p. 35; pp. 1 to 3 Ref. 20, pp. 712, 1211; Ref. 26

234 Uranium

JM

- SS

- 05 0.0144 0.0 ug/g Ref. 19, pp. Ref. 26, pp. 20 to 21; Ref. 20,
1 to 3 pp. 711, 1204;

235 Uranium 2.06 0.13 ug/g Ref. 19, pp. 20 to 21; Ref. 26, pp. 1 to 3 Ref. 20, pp. 711, 1204;Source Characterization
- Source 1

HRS Documentation Record 

### 18 Jackpile

- Paguate Uranium Mine

NMN000607033 Hazardous
Substance Evidence

Station
Location No. Concentration Reporting
Limit 2 /

MDC/LOD 1 Units Ref erences

EPA Site Inspection Activities

– March 2010 3

238 Uranium JM

- SS

- 05 271 0.0 ug/g Ref. 19, pp. 20 to 21; Ref. 26, pp. 1 to 3 Ref. 20, pp. 711, 1204;

EPA Expanded Site Ins pection Activities

– April 2011 3

230 Thorium

NPOP20E 1.85 0.198 pCi/l Ref. 35, pp. 79, 740, 768, 1587

234 Uranium 36,500 2.20 pCi/l Ref. 35, pp. 79, 740, 768, 1587

235 Uranium 40,400 2.55 pCi/l Ref. 35, pp. 79, 740, 768, 1587

238 Uranium 64,300 2.20 pCi/l Ref. 35, pp. 79, 740, 768, 1587

226 Radium 33.2 0.74 pCi/l Ref. 35, pp. 79, 379, 422, 1587

228 Radium 13.9 0.92 pCi/l Ref. 35, pp. 79, 379, 422, 1587

228 Thorium

SPOP35 0.075 0.041 pCi/l Ref. 35, pp. 78, 79, 748, 779, 1587

234 Uranium 7840 0.2 08 pCi/l Ref. 35, pp. 78, 79, 748, 779, 1587

235 Uranium 6450 0.241 pCi/l Ref. 35, pp. 78, 79, 748, 779, 1587

238 Uranium 9950 0.207 pCi/l Ref. 35, pp. 78, 79, 748, 779, 1587

226 Radium 17.3 0.74 pCi/l Ref. 35, pp. 78, 79, 390, 430, 1587

228 Radium 17 .3 0.92 pCi/l Ref. 35, pp. 78, 79, 390, 430, 1587

228 Thorium

JPOP41S 0.247 0.164 pCi/l Ref. 35, pp. 81, 736, 759, 1587

230 Thorium 1.49 0.187 pCi/l Ref. 35, pp. 81, 736, 759, 1587

234 Uranium 63,300 9.05 pCi/l Ref. 35, pp. 81, 736, 759, 1587

2 35 Uranium 72,100 1.57 pCi/l Ref. 35, pp. 81, 736, 759, 1587

238 Uranium 114,000 1.35 pCi/l Ref. 35, pp. 81, 736, 759, 1587

226 Radium 208 0.74 pCi/l Ref. 35, pp. 81, 373, 417, 1587

228 Radium 38.3 0.92 pCi/l Ref. 35, pp. 81, 373, 417, 1587

Notes:

1 ug/g

– microgram per gram = milligram per kilogram (mg/kg) pCi/l

– picocurie per liter

2 The Reporting Limit is defined as the Minimum Detectable Concentration (MDC) for uranium and thorium by Alpha Spectroscopy is the net concentration that has a specified chance of being detected (Ref. 39, p. 3). Limit of Detection (LOD) is equal to the Laboratory Detection Limit for radium (Ref. 35, p. 337)

3 Radiological data were validated by a START

- 3 Certified Health Physicist with 30 years of radiation cha racterization experience. Data for target analytes meet the definitive data quality objective (Ref. 26 , p. 49 ; Ref. 35, p. 1534 ).Source Characterization
- Source 1

HRS Documentation Record 

### 19 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Source 1 Non -Radioactive Results

Hazardous
Substance Evidence
References Station
Location No. Concentration Reportin g Limit 2 Units 1

EPA Site Inspection Activities

– March 2010 3

Vanadium JM

- SS

- 01 30 1 mg/kg Ref. 19, p. 23; Ref. 20, pp. 714, 791; Ref. 25, pp. 45 to 49

Chromium

JM

- SED

- 02 5.8 1.7 mg/kg Ref. 19, p. 35; Ref. 20, pp. 712, 785; Ref. 25, pp. 45 to 49

Manganese 270 1.7 mg/kg Ref. 19, p. 35; Ref. 20, pp. 712, 785; Ref. 25, pp. 45 to 49

Vanadium 15 1.7 mg/kg Ref. 19, p. 35; Ref. 20, pp. 712, 785; Ref. 25, pp. 45 to 49

Zinc 36 3.4 mg/kg Ref. 19, p. 35; Ref. 20, pp. 712, 785; Ref. 25, pp. 45 to 49

Cobalt

JM

- SW

- 02 0.023 0.01 mg/l Ref. 19, p. 35; Ref. 20, pp. 712, 776; Ref. 25, pp. 45 to 49

Manganese 1.3 0.01 mg/l Ref. 19, p. 35; Ref. 20, pp. 712, 776; Ref. 25, pp. 45 to 49

Zinc 0.026 0.02 mg/l Ref. 19, p. 35; Ref. 20, pp. 712, 77 6; Ref. 25, pp. 45 to 49

Vanadium JM

- SS

- 05 90 1 mg/kg Ref. 19, pp. 20 to 21; Ref. 20, pp. 711, 783; Ref. 25, pp. 45 to 49

EPA Expanded Site Inspection Activities

– April 2011 3

Chromium

NPOP20E 0.0604 0.00109 mg/l Ref. 35, pp. 79, 350, 422, 1527, 15 34,
1547

Cobalt 0.0692 0.00051 mg/l Ref. 35, pp. 79, 350, 422, 1527, 1534,
1547

Manganese 4.633 0.00043 mg/l Ref. 35, pp. 79, 350, 422, 1527, 1534,
1547

Chromium

SPOP35 0.0057 0.00109 mg/l Ref. 35, pp. 78, 79, 371, 430, 1527, 1534, 1568

Manganese 0.186 0.00043 mg/l Ref. 35, pp. 78, 79, 371, 430, 1527, 1534, 1568

Chromium

JPOP41S 0.365 0.00109 mg/l Ref. 35, pp. 81, 338, 417, 1527, 1534,
1535

Cobalt 0.0788 0.00051 mg/l Ref. 35, pp. 81, 338, 417, 1527, 1534,
1535

Manganese 2.84 0.00043 mg/l R ef. 35, pp. 81, 338, 417, 1527, 1534,
1535

Notes:

1 mg/kg

– milligram per kilogram mg/l

– milligram per liter

2 The Reporting Limit is defined as the Limit of Detection (LOD) for the April 2011 data provided by Summit Analytical Laboratories.

T he LOD is equal to the Laboratory Detection Limit which is adjusted for dilution fac tors (Ref. 35, p. 337) . The definition of the Reporting Limit used by ALS Laboratory Group was not provided in the laboratory package (Ref. 20, pp. 758 to 762).

3 Chemica l laboratory data collected during EPA SI and ESI activities were validated by a START

- 3 chemist in accordance with EPASource Characterization

- Source 1

HRS Documentation Record

D ec ember 2013 

### 20 Jackpile

- Paguate Uranium Mine

NMN000607033 USEPA Contract Laboratory Program National Functional Guidelines for Inorganic Data Review (July 2002), and the Regional
Protocol for Holding Times, Blanks, and VOA Preservation (April 13, 1989). Data for target analytes meet the definitive data quality object ive (Ref. 25, pp. 5, 36, 49, 74 ).



### 2.4.2 Hazardous Waste Quantity

2.4.2.1 Source Hazardous Waste Quantity

2.4.2.1.1 Tier A: Hazardous Constituent Quantity

- Not Evaluated (NE)

Information on the exact measure (in pounds) of individual hazardous substances in this source is not
available to evaluate Tier A, hazardous constituent quantity . The number of samples collected is not statistically representative of the range of concentrations throughout the source. Therefore , it is not possible to adequately determine a hazardous constituent quantity for Source 1 with reasonable
confidence (Ref. 1, Section 2.4.2.1.1). Scoring proce eds to the evaluation of Tier B, hazardous wastestream quantity (Ref. 1, Section 2.4.2.1.2).

2.4.2.1.2 Tier B: Hazardous Wastestream Quantity

- Not Evaluated (NE)

The information on the total mass of all hazardous wastestreams and CERCLA pollutants and
contaminants for Source 1 is not sufficient to evaluate Tier B, hazardous wastestream quantity . There is insufficient information that documents wastestream disposal over the facilities operational life ; therefore, it is not possible to adequately determ ine a complete hazardous wastestream quantity for Source 1 (Ref. 1, Section 2.4.2.1.2). Scoring proceeds to the evaluation of Tier C, volume (Ref. 1, Section 2.4.2.1.3).

2.4.2.1.3 Tier C: Volume

– Not Evaluated (NE)

The depth of each pit could not be accurately determined based on the information available

. T herefore, information is not sufficient to evaluate Tier C and it is not possible to adequately determine a volume for Source 1 (Ref. 1, Section 2.4.2.1.2). Scoring proceeds to the evaluation of Tier D, area (Ref. 1, Section 2.4.2.1.3).

2.4.2.1.4 Tier D: Area

The sample results shown in Section 2.4.1 above demonstrate the presence of contamination in each of the Source 1 pits. The area of Source 1 is therefore greater than zero. The Tier D equation for assigning a value for area of a Pile is A /13 (Ref. 1, Table 2

- 5)

.

Area of S ource 1 ( ft 2 

### ): >0

Area Assigned Value = >0 /13

Area Assigned Value = >0Source Characterization

- Source 1

HRS Documentation Record

D ec ember 2013 

### 21 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 2.4.2.1.5 Source Hazardous Waste Quantity Value

Per the HRS, the highest of the values assigned to the source for hazardous constituent quantity (Tier A), hazardous wastestream quantity (Tier B), Volume (Tier C), and Area (Tier D) should be assigned as the source hazardous waste quantity value (Ref. 1, Section 2.4.2.1.5). This hazardous wast e value is
based on the non

- radioactive hazardous substances only and does not include the radioactive
substances. There is insufficient information to accurately score the radioactive hazardous waste quantity value and not scoring radioactive hazardous w aste quantity does not affect the listing decision (Ref. 1, Section 7.2.5.3, Table 2

- 6).

Tier Evaluated Source 1 Values

A Not Evaluated

B Not Evaluated

C 0

D >0



### Source 1 Hazardous Waste Quantity Value: >0Source Characterization

- Source 2

HRS Documentation Record

D ec ember 2013 

### 22 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Source Description: Source 2

– Waste Dump V

Mining operations at the Jackpile

- Paguate Uranium Mine resulted in approximately 2,656 ac res of
surface disturbance (Ref. 4, pp. 56, 59)

. The only waste dump sampled and evaluated for this source is identified as Waste Dump V (Ref. 29). The mine contained 32 waste dumps that account for approximately 48 percent of the disturbed area (Ref. 4, p. 61). The location of Waste Dump V is depicted on Figure A

- 2 and the location of all the waste dumps can be found in References 28 and 29.

The tops of 17 waste dumps were reclaimed between 1976 and 1979. The tops were contoured to a slight slope, water spreading berms were constructed, large boulders were pushed into piles, 18 to 24 inches of soil were spread, and the dumps were seeded (Ref. 4, p. 6 9). In later years, as part of the mine reclamation project, t he waste dumps were re

- sloped, with those containing Jackpile Sandstone at
the surface covered with 3 feet of overburden and 16 inches of topsoil. Waste dumps that did not contain Jackpile San dstone were covered with 18 inches of topsoil (Ref. 5, pp. 7, 8).

As stated above, the wastes generated at Jackpile

- Paguate Uranium Mine were not removed from the
property but left in place and covered with overburden . There was no impermeable cap placed on top of the backfill other than overburden (material removed during surface mining and stockpiled) and topsoil (Ref. 4, p. 64; Ref. 5, p. 8 ). In addition, radiological analytical results from the ESI show
elevated concentrations of gross alpha and gros s beta (Ref. 35, pp. 3, 30, 33).

Source Type

Waste rock accumulated in piles of contamination and was placed in waste dumps (Ref. 4, p p

. 21, 61 ). These piles of contamination were not removed from the property , but were left in place and sloped
and cove red with overburden

. A s such, the source type for Source 2 is “Pile” (Ref. 1, Table 2

- 5; Ref. 5, p p . 7 , 8 ).

Source Location

Waste Dump V is located just to the east and abutting Rio Moquino, just north of where Rio Moquino and Rio Paguate converge ( Ref . 29 , p. 1 ; Figure A

- 2 ).

Source Containment

Release To Surface Water

Contents of Waste Dump V are exposed to the elements and can release to the surface water through
direct contact and run off. Portions of the perennial surface water body , Rio Moq uino are in direct
contact with the source

. According to Laguna officials, the river banks were not reclaimed and source
materials are present there (Ref. 19, p. 5). Source sample JM

- SS

- 03 was collected during drought
conditions and therefore was not in d irect contact with the surface water . However , after rain events, the Rio Moquino would contain water such that sample location JM

- SS

- 03 would be in direct contact with the surface water (Ref. 19, pp. 4, 6, 7 ; Ref. 43, p. 1 ). There is no maintained engine ered cover, liner, and a run

- on control system and runoff management system (Ref. 31, p. 1)

. There are several dumps with chronic erosion problems and berming performed as part of the reclamation did not perform as expected (Ref. 3, p. 1; R ef. 5, p. 31; R ef. 7, p. 10). Waste Dump V slopes steeply into RioSource Characterization

- Source 2

HRS Documentation Record

D ec ember 2013 

### 23 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Moquino (Ref. 29, p. 1).

A containment value of 10 was selected for Source 2 based on the surface water being in direct contact
with the source and there is no maintained engineered cover, liner, and a run

- on control system and runoff management system ( Ref. 1, Section 4.1.2.1.2.1.1 ; Ref. 31, p.1 ).

Surface Water Overland /Flood Migration Component Containment Value: 10

2.4.1 Hazardous Substances

On 03 March 2010, as part of the SI of the Jackpile

- Pagu ate Uranium Mine property , the EPA Region

6 START

- 3 contractor, collected one solid waste sample JM

- SS

- 0 3 from this source at the Jackpile

Paguate Mine

. This sample is considered an appropriate source sample as it was located where Waste Dump V was identi fied on reclamation figures and by Marvin Sarracino, Pueblo of Laguna Reclamation Project Technician (Ref. 19 , pp. 2, 8, 21 ; Ref. 29 ; Figure A

- 2 ).

The solid waste sample was collected according to the approved QASP (Ref. 30, p. 18) . The solid

waste sam ple was collected with disposable plastic scoops, and then transferred to an 8

- ounce sample container (Ref. 8 , pp. 15, 17 ). The solid waste sample was collected from near surface (Ref. 8 , p. 107 ).

The sample was shipped via Federal Express to ALS Labor atory Group located in Fort Collins,
Colorado (Ref. 8, p. 16; Ref. 19, pp. 11, 23)

. The sample was analyzed for total metals by EPA
Methods SW

- 846 3005A (liquid) 3050B (solid) and 6010B, total cyanide by EPA Methods SW

- 846 9010 and 9014, mercury by EPA M ethods SW

- 846 7470A/7471A and SOP812 Rev. 14, and isotopic uranium by SOP778R13 and SOP714R11 (Ref. 20, pp. 13, 51, 542, 720, 758, 1170). Once final analytical results were received, the data underwent a third

- party data review and validation performed by a START

- 3 chemist not associated with the sampling conducted at the property (Ref. 8; Ref. 25).

Analytical evidence of the contamination in Source 2 is summarized as follows:

Source 2 Radioactive Results

Hazardous
Substance Evidence
References St ation Location

No. Concentration ( ug/g ) 1 Reporting
Limit 2

EPA Site Inspection Activities

– March 2010 3

Uranium 234

JM

- SS

- 03 224 0.0 Ref. 19, p. 21; Ref. 20, pp. 712, 1210; Ref. 26, pp. 1 to 3

Uranium 235 2.62 0.03 Ref. 19, p. 21; Ref. 20, pp. 712, 121 0; Ref. 26, pp. 1 to 3

Uranium 238 367 0.0 Ref. 19, p. 21; Ref. 20, pp. 712, 1210; Ref. 26, pp. 1 to 3

Notes:

1 ug/g

– microgram per gram

2 The Reporting Limit is defined as the MDC for uranium by Alpha Spectroscopy and is the net concentrati on that has a specified chance of being detected (Ref. 39, p. 3).

3 Uranium data were validated by a START

- 3 Certified Health Physicist with 30 years of radiation characterization experience. Data for target analytes meet the definitive data quality objective (Ref. 26).Source Characterization
- Source 2

HRS Documentation Record 

### 24 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Source 2 Non-Radioactive Results

Hazardous
Substance Evidence
References Station Location

No. Concentration ( mg/kg ) 1 R eporting
Limit 2

EPA Site Inspection Activities

– March 2010 3

Manganese JM

- SS

- 03 84 1 Ref. 19, p. 21; Ref. 20, pp. 712, 786; Ref. 25, pp. 45 to 49

Vanadium JM

- SS

- 03 20 1 Ref. 19, p. 21; Ref. 20, pp. 712, 786; Ref. 25, pp. 45 to 49

Notes: mg/kg

- milligram per kilogram (mg /kg) = parts per million (ppm)

2 The Reporting Limit is defined as the Minimum Det ectable Concentration for uranium by Alpha Spectroscopy and as the Sample Quantitation Limit adjusted for sample aliquot, sample volume, and dilutions for the metals analysis (Ref. 32).

3 Chemical laboratory data collected during EPA SI and ESI activitie s were validated by a START

- 3 chemist in accordance with EPA USEPA Contract Laboratory Program National Functional Guidelines for Inorganic Data Review (July 2002), and the Regional Protocol for Holding Times, Blanks, and VOA Preservation (April 13, 1989). Data for target analytes meet the definitive data quality objective (Ref. 25, pp. 5, 36, 49, 74).



### 2.4.2 Hazardous Waste Quantity

2.4.2.1 Source Hazardous Waste Quantity

2.4.2.1.1 Tier A: Hazardous Constituent Quantity - Not Evaluated (NE)

Informati on on the exact measure (in pounds) of individual hazardous substances in this source is not available to evaluate Tier A, hazardous constituent quantity. The number of samples collected is not statistically representative of the range of concentrations t hroughout the source. Therefore, it is not possible to adequately determine a hazardous constituent quantity for Source 2 with reasonable
confidence (Ref. 1, Section 2.4.2.1.1). Scoring proceeds to the evaluation of Tier B, hazardous wastestream quantit y (Ref. 1, Section 2.4.2.1.2).

2.4.2.1.2 Tier B: Hazardous Wastestream Quantity - Not Evaluated (NE)

The information on the total mass of all hazardous wastestreams and CERCLA pollutants and
contaminants for Source 2 is not sufficient to evaluate Tier B, hazardous wastestream quantity. There is insufficient information that documents wastestream disposal over the facilities operational life; therefore, it is not possible to adequately determine a complete hazardous wastestream quantity for

Source 2 (Re f. 1, Section 2.4.2.1.2). Scoring proceeds to the evaluation of Tier C, volume (Ref. 1, Section 2.4.2.1.3).

2.4.2.1.3 Tier C: Volume – Not Evaluated (NE)

The depth of Waste Dump V could not be accurately determined based on the information available. Therefore, information is not sufficient to evaluate Tier C and it is not possible to adequately determine a volume for Source 2 (Ref. 1, Section 2.4.2.1.2). Scoring proceeds to the evaluation of Tier D, area (Ref. 1, Section 2.4.2.1.3).Source Characterization
- Source 2

HRS Documentation Record 

### 25 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 2.4.2.1.4 T ier D: Area

The area of Source 2, W aste Dump V, was determined using GIS software. The GIS software
calculated the area of the basal footprint polygon of Waste Dump V, outlined by contours visible in current aerials and within a topographic map include d as part of the ROD Compliance Assessment (Ref. 4, p. 11; Ref. 29, p. 1; Ref. 33, pp. 2, 3). The GIS software calculated the area of Waste Dump V to be 566,280 ft 2 

### (Ref. 33, pp. 1

- 3). The Tier D equation for assigning a value for area of a Pile is

A/13 (Ref. 1, Table 2- 5). Area of Source 2 (ft 2 

### ): 566,280

Area Assigned Value = 566,280 ft 2 

### /13

Area Assigned Value = 43,560Source Characterization
- Source 2

HRS Documentation Record 

### 26 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 2.4.2.1.5 Source Hazardous Waste Quantity Value

Per the HRS, the highest of the values assigned to the source for hazardous con stituent quantity (Tier A), hazardous wastestream quantity (Tier B), Volume (Tier C), and Area (Tier D) should be assigned as the source hazardous waste quantity value (Ref. 1, Section 2.4.2.1.5). This hazardous waste value is
based on the non

- radioactive hazardous substances only and does not include the radioactive
substances. There is insufficient information to score the radioactive hazardous waste quantity value
and not scoring radioactive hazardous waste quantity does not affect t he listing decision (Ref. 1, Section 7.2.5.3, Table 2- 6).

Tier Evaluated Source 2 Values

A Not Evaluated

B Not Evaluated

C 0

D 43,560



### Source 2 Hazardous Waste Quantity Value: 43,560Other Possible Sources

HRS Documentation Re cord

D ec ember 2013 

### 27 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Other Possible Sources

Other possible sources associated with the Jackpile -P aguate Uranium Mine site include 31 waste dumps and 23 protore stockpiles. Due to the large area of the Jackpile mine, individual samples
could not be collected from these possible source areas . Therefore, these other possible sources were not evaluated separately or used in the scoring of the site. However, the hazardous substances associated with these possible sources are expected to be the same as Sources 1 and 2 as they resulted from the same mining activities.

Mining operations at the Jackpile-Paguate Uranium Mine resulted in 2,656 acres of surface disturbance (Ref. 4, pp. 56, 59). The mine contained 32 waste dumps that account for approximately 48 percent of the disturbed area (Ref. 4, p. 61).

The tops of 17 waste dumps were reclaimed betwe en 1976 and 1979. The tops were contoured to a slight slope, water spreading berms were constructed, large boulders were pushed into piles, 18 to 24 inches of soil were spread, and the dumps were seeded (Ref. 4, p. 69). In later years, as part of the
min e reclamation project, the waste dumps were re -sloped, with those containing Jackpile Sandstone at the surface covered with 3 feet of overburden and 16 inches of topsoil. Waste dumps that did not contain Jackpile Sandstone were covered with 18 inches of topsoil (Ref. 5, pp. 7, 8).

During mining operations, the uranium ore was segregated according to grade and stockpiled for shipment to the mill. Located outside and inside of the open pits were 23 protore stockpiles. The protore that was located outside the pits covered approximately 103 acres and contained approximately 7.2 million cubic yards of material. Those stockpiles located inside the pits contained about 3.1 million cubic yards of material but do not constitute additional acreage of disturbed ground (Ref. 4, p. 61; Ref. 28, pp. 6, 22, 37).

Protore is material that was stockpiled throughout the mining operation because it contains elevated
but sub

- economic uranium concentrations (Ref. 4, p. 73). Approximately 21 million tons of protore,
contain ing 0.02 to 0.059 percent uranium exist at the mine. This material was located on the surface in 23 stockpiles dispersed throughout the mine (Ref. 4, p. 74). Between 1989 and 1993, these protore stockpiles were moved into the pits (North Paguate Pit , South Paguate Pit, and Jackpile Pit) and used as backfill (Ref. 5, pp. 31, 32).

As stated above, the wastes and protore generated at Jackpile

- Paguate Uranium Mine were not removed from the property but left in place and covered. There was no impermeable cap placed on top of the backfill other than overburden (material removed during surface mining and stockpiled), shale, and topsoil (Ref. 4, p. 64; Ref. 5, pp. 8, 31, 32).Other Possible Sources

HRS Documentation Record

D ec ember 2013 

### 28 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Other Possible Sources Summary

Possible Source Rationale Containment

Features Reference

Waste Dumps Mining operations at the Jackpile

- Paguate mine resulted in 2,656 acres of surface disturbance. Waste rock accumulated in piles of contamination and was placed in a total of 32 waste dumps. One waste dump was evaluated as a source and th e remaining 31 waste dumps are considered other possible sources. The dumps were not removed from the property but were left in place and covered with overburden. Contents of the waste dumps are exposed to the elements and can release hazardous
substances to surface water through direct contact and run off. Further, portions of the Rio Moquino are in direct contact with some of the waste dumps.

While specific sampling data does not exist for the 31 waste dumps, hazardous substances associated with these p ossible sources should be the same
hazardous substances associated with Sources 1 and 2 since they resulted from the same mining
activities. There is no
maintained engineered cover, liner, or run

- on control system or

run

- off management
system. Ref, 4, pp. 21, 56, 59, 61, 64; Ref. 5, p. 8; Ref. 31, p.

1

Protore Stockpiles During mining operations, the uranium ore was segregated according to grade and stockpiled for shipment to the mill. Located outside and inside of the open pits were 23 protore stockpil es. The protore stockpiles located outside the open pits covered approximately 103 acres and contained approximately 7.2 million cubic yards of material. The stockpiles located inside the pits contained about 3.1 million cubic yards of material but do no t constitute additional acreage of disturbed ground. Protore is material that was stockpiled throughout the mining operation because it contained elevated
but sub

- economic uranium concentrations. Approximately 21 million tons of protore, containing 0.02 to 0.059 percent uranium exist at
the mine site. This material is located on the surface in 23 stockpiles dispersed throughout the mine. The protore stockpiles were not removed from the property but used for backfill material in the pit areas. There was no impermeable cap placed on top
of the backfill other than a 1 foot cover of shale and 18 inches of top soil. While specific sampling data does not exist for the 23 protore stockpiles, hazardous substances associated with these possible sources should be t he
same as those hazardous substances associated with Sources 1 and 2 since they resulted from the same mining activities. There is no
maintained engineered cover, liner, or run

- on control system or

run

- off management system. The only
cover consists of 1
foot of shale and 18 inches of topsoil.
Materials in the protore stockpiles
could have release d
hazardous substances
to surface water through direct contact
and run off. Ref. 4, pp. 61, 64, 73, 74; Ref. 5, pp. 31, 32; Ref. 28, pp. 6, 22, 37Source Characterization

- Source Summary

HRS Documentation Record

D ec ember 2013 

### 29 Jackpile

- Paguate Uranium Mine

NMN000607033 

### SITE SUM MA RY OF SOURC E DESCRIPTION

Source

No. Source Hazardous Waste Quantity

Value Containment

Ground

Water Surface Water : Overland/Flood Migration Component Surface Water :
Ground Water to Surface

Water Migration Component Air Gas Air
Particulate

1 NE NE NE 1 0 NE NE

2 43,560 NE 10 NE NE NE

NE = Not EvaluatedGW Pathway

– Not Scored

HRS Documentation Record 

### 30 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 3.0 GROUND WATER MIGRATION PATHWAY SCORE

- NOT SCORED

The ground water migration pathway will not be scored because it is not expected to contribute significantly to the site score nor affect the l isting decision

. The site score exceeds 28.50 and qualifies for listing based only on the evaluation of the surface water pathway.

Although there is historical evidence of contamination through sampling of 11 monitoring wells within the Jackpile

- Paguate Uranium Mine , there is a lack of documented ground water targets. The mine floor is generally above the water table and there are no potable wells located down gradient (south) of
the property (Ref. 18, p. 11). Annual ground water monitoring was conducted from 1995 through

2007. Analytical results from the post

- reclamation ground water sampling showed contamination
within the on

- site monitoring wells of total uranium concentrations from 0.001 mg /L to 624.51 mg /L. Monitoring Wells MW

- 1 through MW

- 7 contai ned total uranium concentrations that exceeded the EPA MCLs 0.03 mg/L for total uranium at one time or another during this sampling period (Ref. 5 , pp. 189, 205

, 209 ; Ref . 21, pp. 1

- 12 ).

As part of the April 2011 ESI, ground water samples and hydrologic d ata were collected from 12 wells
at the facility in an effort to further determine whether ground water is a pathway for the migration of
contaminants from the property (Ref. 36, p. 4) . While this pathway will not be scored for this
property , some general information about the aquifers at the property is presented in this section to provide context of the interaction between ground water and surface water.

Regional ground water occurs in both unconsolidated sediments and bedrock. Unconsolidated
sediments include Quaternary fluvial, colluvial, and alluvial deposits associated with the Rio Paguate and Rio Moquino systems ( Ref. 35, p. 2 751 ). The two principal aquifers in the area are the alluvium and Jackpile sandstone (Ref. 35, p. 2822).

Ground water al so occurs in coarse

- and medium

- grained sedimentary units, including Jurassic sands
of the Morrison Formation. Ground water is also present in the capping Quaternary basalts, where it permeates through vesicles and joint fractures; seeps from these basalt s likely provide the headwaters for the perennial surface waters of Rios Paguate and Moquino ( Ref. 35, p. 2751 ).

The Alluvial Aquifer is comprised of coarse

- to fine

- grained clastic sediments

– primarily sands

- transported and deposited by the fluvial system. The alluvium is described as up to 80 to 100 feet thick in some parts of the basin, thickening with distance from the source areas of the surface water system. The water

- bearing units are approximately 20 feet thick throughout the study area, and the hydraulic conductivity (K) for this aquifer is calculated at 23 feet per day ( Ref. 35, p. 2751 ).

Ground water chemistry in the Alluvial Aquifer is dominated by calcium

- magnesium cations and
sulfate

- bicarbonate anions, and is classified as calcium

- s ufate

- bicarbonate water by Hydro

- Search ( Ref. 35, p. 2870 ). Total dissolved solids (TDS) concentrations are historically quite variable, ranging from 671 to 3,200 mg/ L , but generally increase with the flow direction across the mine ( Ref. 35, pp. 2751, 287 0 ).

The Jackpile Sandstone Aquifer is described as an aquifer by the USGS ( Ref. 35, p. 2802, 2822 ). The petrology of the Jackpile Sandstone is described as a light

- colored, friable fine to medium sandstone ofSW Pathway

– Overlan d/Flood Migration Component

HRS Documentation Record 

### 31 Jackpile

- Paguate Uranium Mine

NMN000607033 

### variable thickness (up to several hundred feet thick in the study area). The Jackpile Aquifer is stratigraphically confined at the base by thick , black shale of the Morrison Formation (Jurassic), and above by thick shale mapped as part of the Dakota Sandstone (Cretaceous). The shale sandwich

con fines the Jackpile Sandstone Aquifer in all areas, except where the shale units are not intact (such as areas where the Dakota has been removed by natural erosion or mining activities) (Ref. 35, p. 2751).

The water chemistry of the Jackpile Aquifer is dominated by sodium cations and sulfate to bicarbonate anions, and is classified as a sodium

- sulfate

- bicarbonate water by Hydro

- Search ( Ref. 35, p. 2870 ). TDS for the Jackpile Aquifer ranges from 666 to 1

, 577 mg/l ( Ref. 35, p p

. 2870, 2751 ).

The surface o f the Jackpile Aquifer slopes generally to the southeast, although it appears to be affected by activities near the mine, where it becomes unconfined ( R ef. 35, p. 2752 ). The USGS (1885) calculated a hydraulic conductivity for the Jackpile Aquifer of 0.3 f eet per day, which is two orders of magnitude lower than the Alluvial Aquifer (Ref. 35, p. 2838) . This has important consequences, as when the Jackpile and Alluvial aquifers are in direct contact with each other, the Alluvial Aquifer
should dominate nearl y all mixing scenarios (except where the water level in the Jackpile Aquifer is above that of the Alluvial Aquifer) (Ref. 35, p. 2752) . This is demonstrated by ground water monitoring data from Test Well number 1 from the Hydro

- Search (1979) study ; this w ell is screened across the Alluvial and Jackpile aquifers, but the water chemistry plots with the Alluvial Aquifer water on a Piper water chemistry diagram (Ref. 35, pp. 2752, 2871)

.

Historically, Hydro

- Search (1979) used ground water and surface water el evation data, as well as qualitative field observations, to conclude that Rios Paguate and Moquino lose water to the Alluvial Aquifer in the up

- gradient areas to a point approximately 1

, 500 feet above their confluence. Below this point (approximately 5

, 92 5 feet above mean sea level), the river system receives water from the Alluvial Aquifer (Ref. 35, p p

. 2763, 2865

- 2869) . The USGS (1985) confirmed this observation through its own calculations, using the same data set (Ref. 35, pp. 2763, 2838

- 2839 . A simi lar study conducted by Hydro

- Search in July 1981, during “a period of high evapotranspiration,” indicated that the area near the confluence loses water, suggesting a seasonal variation is the gain/loss of the river through this area. No detailed study to date has shown whether this is a regular, or seasonal, variation (Ref. 7, p. 5; Ref. 35, p. 2763) . Hydrologic models by Dames and Moore (1983) and the USGS (1985) predict that surface water should be in intimate contact with ground water . The hydraulic c oefficient of the alluvium is 23 feet per day at the confluence of Rios Paguate and Moquino (USGS 1983), and should be even higher in areas where the alluvium has been replaced by overburden and tailings (Ref. 35, pp

. 2763, 2838).

Currently, g eologic cr oss sections completed through the property based on measurement s collected during the April 2011 ESI, indicate that surface water may have flowed into the North and South Paguate pits, causing ground water to rebound more quickly than modeled. Ground wat er elevations
indicate that ground water from the North Paguate and Jackpile pits is flowing into Rio Moquino.
Ground water from the South Paguate Pit appears to be flowing into Rio Paguate, and water from Rio Paguate (and/or the associated Alluvial Aquif er) may be flowing into the North Paguate Pit (Ref. 35, pp. 2766, 2767, 2773).SW Pathway

– Likelihood of Release

HRS Documentation Record

D ec ember 2013 

### 32 Jackpile

- Paguate Ura nium Mine

NMN000607033 

### 4.0 SURFACE WATER MIGRATION PATHWAY

4.1 OVERLAND/FLOOD MIGRATION COMPONENT

4.1.1 General Considerations

4.1.1.1 Definition of Hazardous Substan ce Migration Path for Ove rland/F lood Component

The hazardous substance migration path includes the in

- water segment that hazardous substances would take as they migrate away from Source 2 at the facility (Ref. 1, Section 4.1.1.1 ) . The h azardous substance migration path for the i n

- water segment for Source 2 is described below. The surface water pathway is presented on Figure s A

- 3 and A

- 4

.

Overland and In

- Water Segments

The mine facility and surrounding areas are drained by Rio Paguate and Rio Moquino . The Rio Paguate flows fro m headwaters located approximately 10 miles above the mine facility , through Bear Canyon, into the watershed that covers much of the eastern flank of Mt. Taylor. The source waters originate through seeps from Quaternary basalts capping Mesa Chivato, as we ll as Quaternary alluvium along the canyon. The Rio Moquino flows from headwaters located approximately 3.5 miles above the
mine facility in Seboyeta Canyon. Like the Rio Paguate, the source waters originate through seeps from Cretaceous sandstones, Quat ernary basalt and alluvium in the upper reaches of the watershed (Ref. 35 , pp, 2753

, 2813, and 2877 ). The Rio Paguate is joined by the Rio Moquino near the center of
the mine facility . Below this confluence, the Rio Pagu ate flows southeasterly into Pag ua te Reservoir before joining the Rio San Jose 5 miles south of the mine facility ( Ref. 4 , p. 101 ). The Rio Paguate has been rechanneled for more than 2,000 feet downstream of its entrance to the mine facility ( Ref. 4 , p. 101 ). The Rio Moquino has been exten sively modified over a 4,000

- foot segment immediately above
its confluence with the Rio Paguate. Waste material has been dumped into the original channel on both sides, straightening the course of the meandering stream ( Ref. 4 , p. 102 ). At the mine facili ty , both streams usually flow all year (perennially); however, south of the mine facility , the Rio Pag uate acts as an ephemeral stream becoming in termittently dry ( Ref. 4 , p. 103 ).

For HRS purposes, in areas in which the average annual rainfall is less th an 20 inches, eligible rivers include those that have been determined to be intermittently flowing water and contiguous intermittently flowing ditches (Ref. 1, Sec. 4.02). The average annual rainfall at the Jackpile

- Paguate
Uranium Mine facility is approx imately 9 to 12 inches (Ref. 22 , p p

. 15

- 16 ).

Flow in Rio Paguate and Rio Moquino is generally moderate from January to March, elevated in March and April, low during the summer months, and moderate from October through December. Short

- term peak flows oc cur in the summer in response to thunderstorms. The highest flow recorded on the Rio Paguate was estimated to be 2,300 cubic feet per second (cfs) (USDI, Geological Survey 1967). Flood estimates of peak discharges at the southern mine boundary are 1,520 cfs for a 5

- year flood; 6,290 cfs
for a 100

- year flood, and 10,500 cfs for a 500

- year flood ( Ref. 4 , p. 103 ).

The Rio Moquino and Rio Paguate bisect the mine ; and the Rio Moquino is in direct contact with Source 2 and dumps identified as other possible so urces , as explained in the Other Possible Sources
section above and Section 4.1.2.1.1 below (Ref. 3 , p. 1 ; R ef. 7, p. 10 ; Ref. 43 ). Within the mine footprint

, ground water in the Jackpile sandstone interchanges with water in the Rio Moquino and Rio Paguat e through the unconsolidated alluvium deposits along the stream chan nels. The stream depositsSW Pathway

– Likelihood of Release

HRS Documentation Record

D ec ember 2013 

### 33 Jackpile

- Paguate Ura nium Mine

NMN000607033 

### act a s a mixing zone between the surface water in the rivers and the ground water discharging from the underlying Jackpile sandstone (Ref. 7, pp. 5, 26).

The in

- water segment begins in the most upstream Probable Point of Entry ( PPE ) to an eligible surface water body as defined in the HRS (Ref. 1, Sec. 4.02). Eligible surface water bodies that have been determined to be part of the in

- water segment s for the Jac kpile

- Paguate Uranium Mine facility include Rio Moquino, Rio Paguate, Paguate Reservoir, and Rio San Jose (Figure A

- 3) . Rationale for including
these eligible surface water bodies is provided below. A PPE is designated for S ource 2 (Ref. 3, p. 1; Figure A

- 3). This PPE is located where the Source 2 waste dump is closest to the Rio Moquino (see Figure A

- 3).

The target distance limit (TDL) for the surface water pathway, which defines the maximum distance over which targets are considered, is 15 miles. T he TDL is defined as being 15 miles from the f a rthest
downstream PPE in the in

- water segment section. The 15

- mile surface water flow path is presented in Figure A

- 4 (Ref. 1, Sec. 4.1.1.2).

Drainage from Source 2 enters the Rio Moquino at PPE 3 ( refer to Figure A

- 3 ). The slo p e from S ource 2 is towards Rio Moquino (Ref. 3, p. 1). PPE 3 is the closest point of entry from Waste Dump V to Rio Moquino with a minimal (>0) overland f low distance (Ref. 40, pp. 1, 2). From PPE3, Rio Moquino flows approximately 6 00 feet before converging with Rio Paguate. From the convergence , Rio Paguate flows approximately 5 .2 miles before entering the Paguate Reservoir and the Mesita Dam . The Paguate Reservoir is approximately 0. 5 miles long, and then the Rio Paguate continue s an additional 0.6 miles
before conver g ing with and becoming the Rio San Jose . The Rio San Jose continues for the remaining
15

- mile TDL (Ref. 3, p p . 1 to 3 ; Ref. 12 ). Within the in

- water segment of the TDL, there are two Level

II fisheries which have be en identified between the PPE and the location where sample PR

- SW

- 01 was collected within the northern portion of the Paguate Reservoir (Ref

. 23, Figure A

- 3 ). There is also a potential fishery within the southern portion of the Paguate Reservoir to the Ri o San Jose downstream
to the TDL (Ref. 23, Figure A

- 3 )

.

Surface waters from the Rio Paguate and Rio Moquino are used for irrigation upstream from the villages of Paguate and Seboyeta, respectively. Surface water is also consumed by livestock from the Pag uate Reservoir and along the Rio Paguate between the reservoir and the mine facility at points of access ( Ref. 4 , p. 104 ). The Rio Paguate is designated by the New Mexico Water Quality Control
Commission for the following uses: domestic wa ter supply, fish culture, high

- quality coldwater fishery, irrigation, livestock, and wildlife watering, and secondary contact recreation ( Ref. 4 , p. 106 ).

Surface waters are not regularly used for human consumption in the Paguate

- Laguna area; however, part of the surface water passing through the mine facility collects downstream in the Paguate
Reservoir

. Water from this reservoir is used as drinking water by li vestock, so a potential pathway exists for indirect exposure ( Ref. 4 , p. 98 ).SW Pathway

– Likelihood of Release

HRS Documentation Record

D ecember 2013 

### 34 Jackpile

- Paguate Ura nium Mine

NMN000607033 

### 4.1.2.1 LIKELIHOOD OF RELEASE

4.1.2.1.1 Observed Release

Direct Observation

Observed release can be established by direct observation. Material containing hazardous substances is in direct contact with the surface water and has been seen entering the surface water pathway through
d irect deposition.

The Rio Moquino has been extensively modified over a 4,000

- foot segment immediately above its confluence with the Rio Paguate. Waste material has been dumped into the original channel on both sides, straightening the course of the meandering stream (Ref. 4, p. 102).

During the March 2010 SI sampling activities, sample JM

- SS

- 03 was collected on the bank of the Rio Moquino and close to surface water sample RM- JM

- SW (Figure A -5A; Ref. 19, pp. 21, 22; Ref. 30, pp. 76, 77). According to L aguna officials, the river banks were not reclaimed and source materials are present there (Ref. 19, p. 5). Source sample JM

- SS

- 03 was collected during drought conditions and therefore was not in direct contact with the surface water. However, after rain events, the Rio Moquino
would contain water such that sample location JM

- SS

- 03 would be in direct contact with the surface water (Ref. 19, pp. 4, 6, 7; Ref. 43, p. 1 ). Sample JM

- SS

- 03 contained elevated concentrations of total uranium at 127 ppm (Ref. 20, pp. 172, 1210; Ref. 26, 1 to 3). The surface water samples collected within the Rio Moquino adjacent to this sample contained total uranium at 16.8 ppb, 109 ppb and 78.9 ppb (Ref. 19, p. 22; Ref. 20, pp. 22, 75, 1190, 1219; Ref. 25, pp. 1 to 5; Ref. 26, pp 1 to 3; Ref. 35, pp. 96, 772

- 773, 1587). These concentrations were greater than background concentrations found within Rio Moquino (sample RM

- SW

- BG) (Ref. 19, p. 18; Ref. 20, pp. 18, 70, 557, 580,711,782,1203; Ref. 25, pp. 1 to 5, 45 to 49; Ref. 26, pp. 1 to 3; Ref. 35, pp. 87-88, 774, 1587).

During the April 2011 ESI sampling event, START

- 3 personnel found radiation readings greater than 999 microRem per hour (uR/h) using a Ludlum Radiation meter along the banks of Rio Paguate just upstream of the confluence of the Rio Paguate and the Rio Moquino (Ref. 35, p. 96). Rocks containing oxidized uranium could also be seen along the river bank where the high radioactive readings were detected (Ref. 35, pp. 67, 68).SW Pathway

– Likelihood of Release

HRS Documentation Record 

### 35 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Chemical Analysis

Sediment and sur face water samples were collected during the March 2010 EPA SI and April 2011
EPA ESI (Ref. 8 , p. 6; Ref. 19 ; Ref. 35, p. 114 ). Sediment and surface water samples during the March 2010 sampling event were collected from the surface water pathway at 9 locations in the Rio Moquino, Rio Paguate, and Paguate Reservoir (Ref. 8, p. 27 ) . During the April 2011 sampling event, surface water samples were collected from 8 locations and sediment samples were collected from 9 locations in the Rio Moquino, Rio Paguate , and Paguate Reservoir (Ref. 36 , p. 4 ). Sample locations are depicted in Figures A-5A and A-5B.

Background Concentrations:

Background sediment and surface water samples were collected from the locations listed below to investigate whether a release from the facility could be established (Ref. 8, Ref. 19; Ref. 35, p. 118 ).

• 

### Rio Moquino - Two background sediment sample s and two surface water sample s were collected from Rio Moquino during the March 2010 and April 2011 sampling events ( RM

- SW

BG, RM

- SED

- BG

, RM

- SW

- BG

- 110419, R M- SED

- BG -110419 ) immediately upstream of the Jackpile

- Paguate Uranium Mine before confluence with the Rio Paguate. The background
sediment sample and surface water sample s collected from Rio Moquino is compared to facility

- related sedime nt and surface water samples collected from Rio Moquino, Rio Paguate and the Paguate Reservoir

.

• 

### Rio Paguate

– Two background sediment sample s and two surface water sample s were collected from Rio Paguate ( during the March 2010 and April 2011 sampling even ts ( RP

- SW

BG, RP

- SED

- BG , R P- SW

- BG -041911 , RP

- SED

- BG -041911 ) immediately upstream of the Jackpile

- Paguate Uranium Mine before confluence with the Rio Moquino. The background
sediment sample and surface water samples collected from Rio Paguate is compared t o site

related sediment and surface water samples collected from Rio Moquino, Rio Paguate , and the Paguate Reservoir

.

• Mesita Diversion – O ne sediment sample (MD

- SW -110420) was collected off the Rio San Jose from an irrigation diversion ditch in April 2011 to determine regional background levels and was used in standard deviation background calculations for radionuclide concentrations from the Rio Moquino, Rio Paguate and Paguate Reservoir.



### The topographic map of the area indicates the presence of surface water bodies for which there are no background samples. Arroyo Moquino, which appears to be an intermittent stream that flows through the mine into Rio Paguate just below the Rio Paguate and Rio Moquino confluence

, no longer converges with the Rio Paguat e and therefore was not considered an appropriate background location (Ref. 3; Ref. 19, p. 4). Another intermittent stream

, Oak Canyon

, exists south of the facility and flows into Rio Paguate at a point just north of the Paguate Reservoir (Ref. 3). According to the Pueblo of Laguna Environmental and Natural Resources Department, Oak Canyon is an arroyo with no regular
flow and contains run

- off water from rain events. Due to the topography of the area, there is no way to access Oak Canyon to obtain a back ground sample. Upon further review of possible sources within the vicinity of the Jackpile

- Paguate Mine , t here are no other potential sources of contamination locatedSW Pathway

– Likelihood of Release

HRS Documentation Record 

### 36 Jackpile

- Paguate Uranium Mine

NMN000607033 

### upstream of Oak C anyon. The closest mine in the area, S t. Anthony, drains into Arroyo C onchas located northeast of the Jackpile

- Paguate Uranium Mine (Ref. 3; Ref . 19, p. 3)

According to the QASP s for the property , the Rio Moquino and Rio Paguate background sampling
location s were collected immediately upstream of the Jackpile

- Paguate Uraniu m Mine for the purposes of collecting samples unaffected by the mine facility and to establish background concentrations of the
local area (Ref. 30

, p. 23; Ref. 35, p. 118 ; Figures A

- 5A, A

- 5B )

.

The background sediment samples were collected on 0 2 March 2010 and 19 April 2011 by START

- 3 with disposable pl astic scoops, in accordance with the approved QASP s , and then transferred to an 8

- ounce sample container (Ref. 8, pp. 15, 17 ; Ref. 30, p. 18 ; Ref. 35, p. 121 ; Ref. 36, p. 4 ). The sediment samples were co llected from 0 to 2 inch es below ground surface (Ref. 19, p. 29 ; Ref. 35, pp. 222

- 223 ; Ref. 36, p. 4 ) . The samples were collected from locations within the creek channel where sediments had
accumulated

, such as bends in the creek (Ref. 8 ; Ref. 35, pp. 222

- 223 ; Ref. 36, p. 4 )

. The background surface water samples were collected by submerging the sample container into the water and facing the mouth of the container upstream while sampling personnel stood downstream (Ref. 8 , p. 113 ; Ref. 36, p. 4 ). T he Marc h 2010 samples were shipped via Fed eral Ex press to ALS Laboratory Group located in Fort Collins, Colorado (Ref. 8, p. 16; Ref. 19, pp. 11, 23). The April 2011 samples were hand delivered to Summit Laboratory, located in Albuquerque, New Mexico on 22 April 2011 (Ref. 36 , p. 5 ). The
March 2010 samples were analyzed for total metals by EPA Methods SW

- 846 3005A(liquid) 3050B (solid) and 6010B, total cyanide by EPA Methods SW

- 846 9010 and 9014, mercury by EPA Methods

SW

- 846 7470A/7471A and SOP812 Rev. 14, an d isotopic uranium by SOP778R13 and SOP714R11 (Ref. 20, pp. 13, 51, 542, 720, 758, 1170). The April 2011 samples were analyzed for: i sotopic

u ranium (isotopes 234, 235, and 238) by method Eichrom ACW

- 03

- 15 and ACW

- 10; total metals by
EPA method 200.7 fo r water and 6010B for solids; selenium by EPA method 6020; mercury by EPA method 7470A/7471A; Radium 226 

### by EPA method 903; and Radium 228 

### by EPA method 904. In addition, all water samples were also analyzed for: a lkalinity by method SM2310

- B; b icarbonate b y method SM

- 17 2320; c arbonate by method SM 4500

- CO2D; Total Dissolved Solids by method SM
2540

- C; and a nions by EPA method 300 (Ref. 36 , pp. 5 )

. Once final analytical results were rec eived,
the data underwent third

- party data review and validation by a ST ART

- 3 chemist not associated with the sampling conducted at the facility (Ref. 25 ; Ref. 36, p. 5 ).

The background samples (surface water and sediment) and the samples collected to demonstrate an observed release were all collected during the same time fram es during the same sampling events ( Ref. 36, p. 4 ). The samples were collected by the same field team s during the same sampling event s , following the same sample collection protocols and methodologies. Background samples were
collected from similar locati ons, were from similar media, same depth, under the same hydrological conditions and flow, used the same sampling methods, preservation, and handling and were all collected during the same weather conditions as the observed release samples ( Ref. 35, pp. 87

- 96; Ref. 36, pp. 7

- 16 ).

No sediment samples were evaluated as observed release samples and therefore are not included in further discussion of background or observed release samples.SW Pathway

– Likelihood of Release

HRS Documentation Record 

### 37 Jackpile

- Paguate Uranium Mine

NMN000607033 

### E PA SI Background Surface Water Sampling – March 2010

Station Lo cation Sampling Location Sample Date (Military

Time) Reference

Rio Moquino

RM

- SW

- BG Rio Moquino upstream of the Jackpile

- Paguate Uranium Mine and of the confluence with Rio Paguate 03/02/10 (1012) Ref. 19, p. 18, Figure A-5A

Rio Paguate

RP

- SW

- BG ( Du plicate)
RP

- SW

- BGD
(Duplicate) Rio Paguate upstream of the Jackpile

- Paguate Uranium Mine and of the confluence with Rio Moquino 03/02/10 (0929) Ref. 19, p. 18, Figure A

- 5A



### EPA SI Background Surface Water Sample Concentrations – March 2010

Station Loc ation Hazardous
Substance Concentration ( mg/l ) 1 Reporting Limit 2 Reference

Rio Moquino

RM

- SW

- BG Manganese 0.027 0.01 Ref. 19, p. 18; Ref. 20, pp. 18, 70 ; Ref. 25, pp. 1 to 5

Rio Paguate

RP

- SW

- BG Manganese 0.045 0.01 Ref. 19, p. 18; Ref. 20, p p. 20 , 73 ; Ref. 25, pp. 1 to 5

RP

- SW

- BGD (Duplicate) Manganese 0.044 0.01 Ref. 19. p.18; Ref. 20, pp. 20 , 74 ; Ref. 25, pp. 1 to 5

Notes:

1 m g/l

– milligram per liter

2 The definition of the Reporting Limit used by ALS Laboratory Group was not provided in the laboratory package (Ref. 20, pp. 758 to 762).



### Samples collected during the March 2010 sampling event from Rio Moquino

, Rio Paguate and Paguate
Reservoir is compared to the highest designated background level as shown below:

Significant Background Concentration – March 2010

Matrix Hazardous
Substance Highest Background
Concentration ( mg/l ) 1 

### 3 x Background

Surface Water Manganese 0.0 45 0. 135

Notes:

1 m g/l

– milligram per literSW Pathway

– Likelihood of Release

HRS Documentation Record 

### 38 Jackpile

- Paguate Uranium Mine

NMN000607033 

### EPA ESI Background Surface Water Sampling

– Apr il 2011

Station Location Sampling Location Sample Date (Military

Time) Reference

Rio Moquino

RM

- SW

- BG

- 110419 Rio Moquino upstream of the Jackpile

- Paguate Uranium Mine and of the confluence with Rio Paguate 04/1 9 /11 (14:25) Ref. 35 , p. 88

, Figure A -5B

Rio Paguate

RP

- SW

- BG

- 041911 Rio Paguate upstream of the Jackpile

- Paguate Uranium Mine and of the confluence with Rio Moquino 04/1 9 /11 (10:25) Ref. 35 , p. 86

, Figure A

- 5B

Mesita Diversion

T his sample location was collected to determine regional background levels and was only used in standard deviation background calculations for radionuclide concentrations

MD

- SW

- 110420 Mesita Diversion where water is
collected from the Rio San Jose to irrigate crops for Mesita Village. 04/20/11 (1415) Ref. 35, p.93, Fi gure A

- 5B



### EPA ESI Background Surface Water Sample Concentrations – April 2011

Station Location Hazardous
Substance Concentration Reporting Limit 2 Units 1 Reference

Rio Moquino

RM

- SW

- BG

- 110419 Uranium 234

Uranium 235

Uranium 238 4.119

0.0996

2.230 0.066

0.019

0.066 pCi/l pCi/l pCi/l Ref. 35, pp. 744, 774,
1587

Rio Paguate

RP

- SW

- BG

- 041911 Uranium 234

Uranium 235

Uranium 238 6.242

0.216

3.793 0.061

0.018

0.041 pCi/l pCi/l pCi/l Ref. 35, pp. 747, 778,
1587

Mesita Diversion

MD

- SW

- 110420 Uranium 234

Uranium 235

Uranium 238 4.858

0.306

2.811 0.0 54

0.0 16

0.0 70 pCi/l pCi/l pCi/l Ref. 35, pp. 736, 760

, 1587

Notes:

1 pCi/l = picocurie per lite r
2 The Reporting Limit is defined as the MDC for uranium by Alpha Spectroscopy and is the net concentration that ha s a specified chance of being detected (Ref. 39, p. 3).

3 Radiological data were validated by a START

- 3 Certified Health Physicist with 30 years of radiation characterization experience. Data for target analytes meet the definitive data quality objective (Ref. 35, p. 1587, Ref. 36, p. 5 ).



### Samples collected during the April 2011 sampling event from Rio Moquino

, Rio Paguate and Mesita Diversion (for standard deviation calculations) is compared against the designated background levels as
shown below:SW Pathway

– Likelihood of Release

HRS Documentation Record 

### 39 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Si gnificant Background Concentrations - April 2011

Sample ID Hazardous
Substance Conc. Units Sample

Mean Sample
Variance 1 Sample
Standard
Deviation 2 2 Standard
Deviations
Above The

Mean

MD

- SW

- 110420 Uranium 234 4.858 pCi/l

5.073 1.161451 1.077706361 7.228412721 RM

- SW

- BG

- 110419 Uranium 234 4.119 pCi/l

RP

- SW

- BG

- 041911 Uranium 234 6.242 pCi/l

MD

- SW

- 110420 Uranium 235 0.306 pCi/l

0.2072 0.01070832 0.103481013 0.414162026 RM

- SW

- BG

- 110419 Uranium 235 0.0996 pCi/l

RP

- SW

- BG

- 041911 Uranium 235 0.216 pCi/l

MD

- SW

- 110420 Uranium 238 2.811 pCi/l

2.94466667 0.624142333 0.790026793 4.524720252 RM

- SW

- BG

- 110419 Uranium 238 2.23 pCi/l

RP

- SW

- BG

- 041911 Uranium 238 3.793 pCi/l

Note:

1 Equation for sample variance =

2 Equatio n for population standard deviation = square root of the population variance

. (a) The result was reported as a non

- detect (3.58 U pCi/l). A value of 1/2 the reporting limit was us ed in the calcula tion of the population standard deviation

. 

# ∑

= 

### −

− n

i i 

### XX

n 1 2 

### )( 1 1SW Pathway

– Likelihood of Release

HRS Documentation Record

D ecember 2013 

### 40 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Observed Release Samples:

Sediment and surface water samples identified as “contaminated” are those that meet observed release criteria as defined by the HRS (Ref. 1, Table 2

- 3). Observed release criteria is met when the hazardous
substance is attributable to a release from the property , its concentration exceeds the Sample Quantitation Limit ( SQL ; including the background SQL), and is at least three times greater than the background concentration when the background concentration equals or exceeds its SQL for no nradionuclides (Ref. 1, Table 2

- 3). For radionuclides that occur naturally or are ubiquitous to the environment, observed release criteria are met when the measured concentration (in units of activity) are at a level that equals or exceeds a value 2 stan dard deviations above the mean site

- specific background concentration for the radionuclide in a specific matrix (Ref. 1, Section 7.1.1). Surface

water sampling locations with concentrations meeting observed release criteria are presented in the
table belo w.

Observed Release Sampling Locations

Station Location Sampling Location Sample Date (Military Time) Reference

EPA SI Surface Water Sampling

– March 2010

RM

- JM

- SW Rio Moquino, within the property

, upstream of its confluence with Rio Paguate and 5,5 00 feet south of the Jackpil e- Paguate Mine boundary at
PPE3 3/3/10 (1529) Ref. 12; Ref. 19, p. 22

RP

- JM

- SW

- 01 Rio Paguate, within the property

, just downstream of the confluence of Rio Moquino and Rio Paguate,

600 feet from PPE3 3/3/10 (1511) Ref. 12 ; Ref. 19, p. 21

RP

- SW

- 01

RP

- SW

- 01D (Duplicate) Rio Paguate at the south property boundary, 5,500 feet downstream
of PPE 3 3/3/10 (1135) Ref. 12; Ref. 19, p. 34

RP

- SW

- 02 Rio Paguate, 15,000 feet
downstream of PPE 3 3/3/10 (1030) Ref. 12; Ref. 1 9, p. 34

RP

- SW

- 03 Rio Paguate, on north side of Paguate reservoir, 27,100 feet
downstream of PPE 3 3/2/10 (1710) Ref. 12; Ref. 19, p. 19

PR

- SW

- 01 Paguate Reservoir, 27,800 feet
downstream of PPE 3 3/2/10 (1526) Ref. 12; Ref. 19, p. 32

EPA ESI Surfac e Water/Sediment Sampling

– April 2011

RM

- JM

- SW

- 110420

RM

- JM

- SW

- 02 (duplicate) Rio Moquino, within the property

, upstream of its confluence with Rio Paguate and 5,500 feet south of the Jackpile

- Paguate Mine boundary at

PPE3 4/20/11 (1705

- SW, 1710

- SW DUP) Ref. 12; Ref. 35, pp. 96, 118

RP

- JM

- SW

- 01

- 110420 Rio Paguate, within the property

, just downstream of the confluence of Rio Moquino and Rio Paguate,
600 feet from PPE3 4/20/11 (1540

- SW Ref. 12; Ref

. 35 , p p

. 94 , 118SW Pathway

– Likelihood of Release

HRS Documentatio n Record

D ecember 2013 

### 41 Jackpile

- Paguate Uranium Mine

NMN000607033 Station Location Sampling Location Sample Date (Military Time) Reference

EPA SI Surface Water Sampling

– March 2010

RP

- SW

- 01

- 110419 Rio Paguate, 5,5 00 feet
downstream of PPE 3 4/19/11 (1540

- SW) Ref. 12; Ref.35, pp. 89, 118

PR

- SW

- 01

- 110420 Paguate Reservoir, 27,800 feet
downstream of PPE 3 4/20/11 (1135

- SW) Ref. 12; Ref . 35 , pp. 92

- 93 , 118



### All observed release samples were collected by START

- 3 o n 02 through 04 March 2010 and from 19 through 20 April 2011 (Ref. 19 ; Ref . 35, pp. 85 -98)

. The sediment samples were collected by START

3 with disposable plastic scoops, in accordance with the approved QASPs, and then transferred to an 8

- ounce sample con tainer (Ref. 8, pp. 15, 17; Ref. 30, p. 18; Ref. 35, p. 121; Ref. 36, p. 4). The surface water samples were collected by submerging the sample container into the water and facing the mouth of the container upstream while sampling personnel stood downstream (Ref. 8, p. 113; Ref. 36, p. 4).

T he samples were analyzed using established EPA methodologies and laboratory Standard Operation Procedures (SOPs)

. The March 2010 samples were shipped via Federal Express to ALS Laboratory Group located in Fort Collins, Colorado (Ref. 8, p. 16; Ref. 19, pp. 11, 23). The April 2011 samples

were hand delivered to Summit Laboratory, located in Albuquerque, New Mexico on 22 April 2011 (Ref. 36 , p. 4). The March 2010 samples were analyzed for total metals by EPA Methods S W-846
3005A (liquid) 3050B (solid) and 6010B, total cyanide by EPA Methods SW

- 846 9010 and 9014, mercury by EPA Methods SW

- 846 7470A/7471A and SOP812 Rev. 14, and isotopic uranium by SOP778R13 and SOP714R11 (Ref. 20, pp. 13, 51, 542, 720, 758, 1170). T he April 2011 samples were analyzed for: isotopic u ranium (isotopes 234, 235, and 238) by method Eichrom ACW -03- 15 and

ACW

- 10; total metals by EPA method 200.7 for water and 6010B for solids; selenium by EPA method 6020; mercury by EPA method 7470A/7471A; Radium 226 

### by EPA method 903; and Radium 228 

### by EPA method 904. In addition, all water samples were also analyzed for: alkalinity by method SM2310

- B; bicarbonate by method SM

- 17 2320; carbonate by method SM 4500

- CO2D; Total Dissolved Solids by
method SM 254 0- C; and anions by EPA method 300 (Ref. 36, pp. 5). Once final analytical results were received, the data underwent third

- party data review and validation by a START

- 3 chemist not associated with the sampling conducted at the property (Ref. 25; Ref. 36, p. 5).SW Pathway

– Likelihood of Release

HRS Documentation Record

D ecember 2013 

### 42 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Surface Water Sample Concentrations – March 2010

Station Location Hazardous
Substance Concentration ( mg/l ) 1 Reporting Limit 2 Reference

EPA SI 3

Rio Paguate

RP

- SW

- 01 Manganese 0.19 0.01 Ref. 19, p. 34; Ref. 20, pp. 714, 780; Ref. 25,

pp. 45 to 49

RP

- SW

- 01D Manganese 0.19 0.01 Ref. 19, p. 34; Ref. 20, pp. 714, 771; Ref. 25, pp. 45 to 49
Paguate Reservoir

PR

- SW

- 01 Manganese 0.25 0.01 Ref. 19, p. 34; Ref. 20, pp. 22, 75; Ref. 25, pp.

1 to 5

Notes:

1 mg/kg

- milligram per liter( mg/ l)

2 The definition of the Reporting Limit used by ALS Laboratory Group was not provided in the laboratory package (Ref. 20, pp. 758 to 762).

3 Chemical laboratory data collected during EPA SI and ESI activities were validated by a START

- 3 chemist in accordance with EPA USEPA Contract Laboratory Program National Functional Guidelines for Inorganic Data Review (July 2002), and the Regional Protocol for Holding Times, Blanks, and VOA Preservation (April 13, 1989). Data for target analytes meet the defi nitive data quality objective (Ref. 25, pp. 5, 36, 49, 74).



### Surface Water Sample Concentrations – April 2011

Station Location Hazardous
Substance Concentration (pCi/l) 1 Reporting Limit 2 Reference

EPA ESI 3

Rio Moquino

RM

- JM

- SW

- 110420 Uranium 234

Uraniu m 235

Uranium 238 37.997

1.540

33.431 0.141

0.029

0.101 Ref. 35, pp. 96, 743, 772, 1587

RM

- JM

- SW

- 02

- 110420 Uranium 234

Uranium 235

Uranium 238 28.334

0.961

23.591 0.038

0.044

0.011 Ref. 35, pp. 96, 743, 772, 1587

Rio Paguate

RP

- JM

- SW

- 01

- 110420 Uranium 234

Ura nium 235

Uranium 238 32.398

1.236

29.257 0.070

0.034

0.052 Ref. 35, pp. 94, 745, 775, 1587

RP

- SW

- 01

- 110420 Uranium 234

Uranium 235

Uranium 238 85.098

3.236

78.787 0.031

0.011

0.025 Ref. 35, pp. 89, 747, 777, 1587

Paguate Reservoir

PR

- SW

- 01

- 110420 Uranium 234

Uranium 235

Uranium 238 17.445

0.565

14.624 0.141

0.029

0.101 Ref. 35, pp. 92

- 93, 740, 769, 1587

Notes:

1 pCi/l = picocurie per liter

2 The Reporting Limit is the MDC, the net concentration that has a specified chance of being detected for uranium by Alpha Spectroscopy

(Ref. 39, p. 3).

3 Radiological data were validated by a START

- 3 Certified Health Physicist with 30 years of radiation characterization experience. Data

for target analytes meet the definitive data quality objective (Ref. 35, p. 1587; Ref . 36, p. 5).



### The metal analysis for samples collected in March 2010 was not of dissolved metals, and field filtrationSW Pathway

– Likelihood of Release

HRS Documentation Record 

### 43 Jackpile

- Paguate Uranium Mine

NMN000607033 

### of the surface water samples was not performed

. Both sediment and surface water samples were collected from each surface water pathway sample location . The sediment samples from March 2010
did not exhibit metal concentrations at observed release concentrations indicating that the metal
concentrations present in the surface water samples were not due to the sediments (Ref. 3 0, pp. 86 to
8 8). All water samples collected April 2 011 were field filtered using 0.45 micrometer (μm) filter paper (Ref. 36, p. 4 ).

The background samples and observed release samples were both collected from the same medium on 02 through 04 March 2010 or 19 through 20 April 2011, by the same START -3 team s operating under the same QASP s and sampling procedures. Background and observed release samples were collected from similar locations, were from similar media, same depth, used the same sampling methods,

preserva tion, and handling and were all collected during the same weather conditions (Ref. 8; Ref; 19; Ref. 30, p. 18; Ref. 35, pp. 87

- 96; Ref. 36, pp. 7

- 16). Both the background samples and observed release samples are of sufficient similarity to document an observed release as defined by the HRS (Ref. 1, Section 4.1.2.1.1).SW Pathway

– Likelihood of Release

HRS Documentation Record

D ecember 2013 

### 44 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Attribution:

As part of an environmental assessment of the Jackpile- Paguate Uranium Mine facility in March 2010

, and April 2011 START

- 3 collected a solid waste source sample from the waste dump within the mine

area (Ref. 19 , Figure A-5A ). The solid waste sample contained uranium 238 

### at 367 ug/g and manganese

at 84 mg/kg ( see Section 2.4.1 of this HRS documentation record ). These same contaminants have
been found as observed releas e samples in the surface water pathway as high as 78.787 pCi/l for
uranium 238 

### and 0.25 mg/l for manganese (see Section 2.4.1.2.1.1 of this HRS documentation record).

The source at the facility is uncontained, and after rain events, the Rio Moquino would contain water such that part of the source would be in direct contact with the surface water (Ref. 19, pp. 4, 6, 7; Ref. 43, p. 1). The Rio Paguate has been rechanneled for more than 2,000 feet downstream of its entrance to the mine facility (Ref. 4, p. 101 ; Ref. 31). The Rio Moquino has been extensively modified over a 4,000- foot segment immediately above its confluence with the Rio Paguate. Waste material has been dumped into the original channel on both sides, straightening the course of the meandering stream (Ref. 4, p. 102). It appears that normal practice was to stockpile waste material in the Rio Moquino’s floodplain as records indicate that approximately 500,000 tons of material from Waste Dump U on the east side of the river were removed during 1 982, the last year of mining operations (Ref. 4, p. 69). Potential hazards resulting from waste dump instability at the mine include rotational failures, base translational failures, and foundation spreading (Ref. 4, p. 77). Such waste dump failures coul d expose material and thus present a health and environmental hazard (Ref. 4, p. 77). Limited slope stabilization studies were performed on the slope of Waste Dump I to evaluate the ability of biodegradable matting to inhibit erosion. Special reseeding techniques were performed on the slope of Waste Dump J. The matting and special reseeding techniques were unsuccessful; however, it is unknown if slope stabilization has actually been performed (Ref. 4, p. 69). Rapid surface water flow from flooding of th e rivers could expose surface water to sources at the property in addition to accelerated erosion of the waste dumps due to the long, steep slopes of the waste dumps and potential high

- intensity rainfall resulting from summer thunderstorms (Ref. 4, p. 116; Ref. 22, p. 2).

Mine waste enters the surface water pathway via two mechanisms. As discussed above, mine waste enters the surface water pathway through direct deposition by overland flow. During the EPA ESI conducted April 2011, it has also been demons trate d that mine waste also enters the surface water pathway through ground water within the mine pits (see Section 2.2 for Source 1 and Section 3). The ground water to surface water mechanism is further discussed in Section 4.2 of this report.

There are other mines in the area, including St. Anthony Mine which is approximately 11,000 feet northeast of Jackpile

- Paguate Mine. The St. Anthony Mine does not connect to Rio Paguate, Paguate Reservoir or Rio San Jose surface water pathway being evaluated (Ref. 3, p. 1, Ref. 19, p. 3 ). Also

, background samples collected for Jackpile

- Paguate Uranium Mine showed low levels (3. 86 ppb and 560 ppb ) of total uranium and manganese (Ref. 20, pp. 18 to 20, 70, 72

- 74, 79, 86, 87, 557 to 559, and
561 to 563 ). A search of the Toxic Release Inventory database was performed within the zip code of
the facility location and no other facilities are listed (Ref. 13).

Due to historical operations, one that has demonstrated to cause uranium and manganese contamination, combined with the overall lack of containment of the source at the facility and the fact that surface water samples meeting observed release criteria are present that support uranium and manganese contamination migration from the source at the facility into the s urface water pathway, theSW Pathway

– Likelihood of Release

HRS Documentation Record 

### 45 Jackpile

- Paguate Uranium Mine

N MN000607033 

### uranium and manganese contamination in the facility can be attributed (wholly or, at least, in part) to the Jackpile

- Paguate Uranium Mine facility

.

Likelihood of Release Factor:

Based on the analytical data and attribution components listed above, uranium 234 

### , uranium 235



### , uranium 238 

### and manganese have been documented as the hazardous substance s in the observed release

to Rio Paguate . Therefore, the observed release factor value of 550 was assigned for Rio Paguate (Ref. 1, Section 4.1.2.1.1).

Likelihood of Release Factor V alue: 550SW Pathway

– Human Food Chain Threat/Waste Characteristics

HRS Documentation Record 

### 46 Jackpile

- Paguate Uranium Mine

N MN000607033 

### 4.1.2.1.2 POTENTIAL TO RELEASE

4.1.2.1.2.1 Potential to Release by Overland Flow

Potential to release was not evaluated because an observed release to surface water was established by
chemical an alysis (see Section 4.1.2.1.1 of this HRS documentation record).SW Pathway

– Human Food Chain Threat/Waste Characteristics

HRS Documentation Record

D ecember 2013 

### 47 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.1.2 DRINKING WATER THREAT

WASTE CHARACTERISTICS

Evidence of contamination associated with Source 2 has been established based on chemical analyses of samples collected from the source as well as through direct observation (refer to the Attribution section and Section 2.2). Manganese, uranium 234 

### , uranium 235 

### , and uranium 238 

### , were detected in surface water samples collected in Rio Paguate and Paguate Reservoir, establishing an observed release (see Section 4.1.2.1.1).

4.1.2.2.1 Toxicity/Persistence/Bioaccumulation

Hazardous
Substance Source

Number Toxicity

Factor
Value Persistence 1

Factor Value Toxicity/
Persistence/ Reference

Manganese 2 10,000 1 10,000 Ref. 2, p. 10

Vanadi um 2 100 1 100 Ref. 2, p. 13

Uranium 234 2 10,000 1 10,000 Ref. 2, p. 16

Uranium 235 2 10,000 1 10,000 Ref. 2, p. 16

Uranium 238 2 10,000 1 10,000 Ref. 2, p. 16

Notes:

1 All hazardous substances were assigned the same persistence factor value (i.e., 1.0 000) for both water body types (river and lake)

within the TDL (Ref 1, Table 4

- 10).



### Toxicity/Persistence Factor Value: 10,000SW Pathway

– Human Food Chain Threat/Waste Characteristics

HRS Documentation Record

D ecember 2013 

### 48 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.1.2.2.2 Hazardous Waste Quantity

Source

No. Source Hazardous Waste Quantity

Value Containment

Ground

Water Surface Wa ter : Overland/Flood Migration Component Surface Water :
Ground Water to Surface Water Migration Component Air Gas Air
Particulate

2 43,560 NE 10 NE NE NE

TOTAL 43,560

NE= not evaluated



### A hazardous waste quantity of 43,560 is estimated for Source 2 at the Jackpile

- Paguate Uranium Mine facility which when applied in HRS Table 2- 6 yields a surface water pathway overland/flood migration component drinking water threat hazardous waste quantity of 1 0,000 for the watershed . Also, as
documented in Sections 4.1.2.1.1 and 4.1.4.3.1.2 of this HRS documentation record, a fishery is subject to Level II concentrations; therefore, a minimum value of 100 can be assigned for the hazardous waste quantity factor value (Ref. 1, Section 2.4.2.2). A value of 1 0 ,000 is a ssigned as the Hazardous Waste Quantity Factor Value since it is the greater value. This hazardous waste value is
based on the non

- radioactive hazardous substances only and does not include the radioactive substances. (Ref. 1, Table 2- 6).

Hazardous Waste Quantity Factor Value = 1 0,000

4.1.2.2.3 Waste Characteristics Factor Category Value

Toxicity/Persistence Factor Value: 10,000 Hazardous Waste Quantity Factor Value: 1 0,000

10,000 (Toxicity/Persistence Factor Value) x 10,000 (Hazardous Waste Quantity Factor Value) = 1 x

10 8 

### (maximum of 1 x 10 8 

### according to HRS Section 4.1.3.2.3)

Waste Characteristics Factor Category Value: 100 (Ref 1, Table 2 -7)

4.1.2.3 TARGETS

No drinking water population targets were identified.SW Pathway

– Human Food Chain Threat/Waste Characteristics

HRS Documentation Record

D ecember 2013 

### 49 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.1.2.3.3 RESOURCES

The R io Paguate is designated by the New Mexico Water Quality Control Commission for the following uses: domestic water supply, fish culture, high

- quality coldwater fishery, irrigation, livestock, and wildlife watering, and secondary contact recreation (Ref. 4 , p. 106). According to Laguna Natural Resource officials, there are approximately 1,500 cattle whose only source of drinking
water is the surface water from the Rio Paguate and the Paguate Reservoir within the TDL . These cattle are used for meat by the tribe. There are also approximately 800 cow elk that use the surface water for drinking (Ref. 4, pp. 98, 100, 104; Ref. 19, p p . 6 , 7 ). As such, under the HRS, a resources value of 5 is assigned to the surface water, in

- water segment of the hazardous subst ance migration path for the watershed used for watering of commercial livestock (Ref. 1, Section 4.1.2.3.3).

Resources Factor Value: 5
4.1.3.2 HUMAN FOOD CHAIN THREAT

WASTE CHARACTERISTICS

Evidence of contamination associated with Source 2 has been established based on chemical analyses of samples collected from the source s as well as through direct observation (refer to the Attribution section and Section 2.2). M anganese , uranium 234 

### , uranium 235 

### , and uranium 238



### , were detected in surface

water samples collected in Rio Paguate and Paguate Reservoir, establishing an observed release (see Section 4.1.2.1.1).

4.1.3.2.1 Toxicity/Persistence/Bioaccumulation

H azardous
Substance Source

Number Toxicity

Factor
Value Persistence 1

Factor Value Human Food
C hain
Bioaccumulation 2

Value Toxicity/
Persistence/
Bioaccumulation

Factor Value Reference

Manganese 2 10,000 1 50,000 5 x 10 8 Ref. 2, p. 10

Vanadium 2 100 1 500 5 x 10 4 Ref. 2, p. 13

Uranium 234 2 10,000 1 0.5 5 ,0 00 Ref. 2, p. 16

Uranium 235 2 10,0 00 1 0.5 5 ,0 00 Ref. 2, p. 16

Uranium 238 2 10,000 1 5,000 5 x 10 7 Ref. 2, p. 16

Notes:

1 All hazardous substances were assigned the same persistence factor value (i.e., 1.0000) for both water body types (river and lake)

within the TDL (Ref 1, Table 4

- 10).

2 Bioaccumulation factor values are assigned from the SCDM (Ref. 2), for the type of water body "Fresh Water” , in which the fisheries

are located (Ref. 1, Sect. 4.1.3.2.1.3).



### Toxicity/Persistence/Bioaccumulation Factor Value: 5 x 10 8SW Pathway

– Human Food Chain Threat/Waste Characteristics

HRS Documentation Record

D ecember 2013 

### 50 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.1.3.2.2 Hazardous Waste Quantity

Source

No. Source Hazardous Waste Quantity

Value Containment

Ground

Water Surface Water : Overland/Flood Migration Component Surface Water :
Ground Water to Surface Water Migration Component Air Gas Air
Particulate

2 43,560 NE 10 NE NE NE

TOTAL 43,560

NE= not evaluated



### A hazardous waste quantity of 43,560 is estimated for Source 2 at the Jackpile

- Paguate Uranium Mine facility which when applied in HRS Table 2- 6 yields a surface water pathway overland/flood migration
component human food chain threat hazardous waste quantity of 1 0,000 for the watershed . Also, as
documented in Section s 4.1.2.1.1 and 4.1.4.3.1.2 of this HRS documentation record, a fishery is subject to Level II concentrations; therefore, a minimum value of 100 can be assigned for the hazardous waste quantity factor value (Ref. 1, Section 2.4.2.2). A value of 1 0 ,000 is assigned as the Hazardous Waste Quantity Factor Value since it is the greater value. This hazardous waste value is
based on the non

- radioactive haz ardous substances only and does not include the radioactive substances. (Ref. 1, Table 2- 6).

Hazardous Waste Quantity Factor Value = 10,000

4.1.3.2.3 Waste Characteristics Factor Category Value

Toxicity/Persistence Factor Value: 10,000 Hazardous Waste Quantity Factor Value: 1 0,000
Bioaccumul ation Potential Factor Value: 5 0,000

10,000 (Toxicity/Persistence Factor Value) x 10,000 (Hazardous Waste Quantity Factor Value) = 1 x

10 8 

### (maximum of 1 x 10 8 

### according to HRS Section 4.1.3.2.3)

1 x 10 8 

### (Toxicity /Persistence Factor Value x Hazardous Waste Quantity Factor Value) x 50,000 (Bioaccumulation Potential Factor Value) = 5 x 10 1 2 

### (maximum of 1 x 10 12 

### according to HRS Section 4.1.3.2.3)

A hazardous waste quantity factor value of 1 0,000 is assigned accordi ng to HRS Section 2.4.2.2

. From Reference 2 and Table 4

- 12 of the HRS, manganese ha s a toxicity/persistence value of 10,000 and a bioaccumulation potential factor value of 50,000. The waste characteristics factor category value from Reference 1, Table 2

- 7 for a waste characteristics product of 1 x 10 12 

### is 1,000.

Waste Characteristics Factor Category Value: 1,000SW Pathway

– Human Food Chain Treat/Targets

HRS Documentation Record

D ecember 2013 

### 51 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.1.3.3 TARGETS



### Level II concentrations in the surface water pathway can be established based on surface water samples that meet the criteria for an observed release and the hazardous substance has a bioaccumulation potential factor value greater or equal to 500 (Ref. 1, Sec. 4.1.3.3). As noted in
Section s 4.1.2.1.1 and 4.1.3.2.1 of this HRS documentation record, an observed release of hazardou s substances having a bioaccumulation factor value of 500 or greater (uranium 238 

### and manganese) is
documented in Rio Paguate . A human food chain fishery is present in Rio Paguate within the TDL (Ref. 3, p p . 2, 3 ; Ref. 2 3 ; Figure A-3). According to the Pueblo of Laguna Environmental and Natural Resources Department, Rio Paguate and Rio San Jose are fished for catfish, bluegill , and crappie that are caught for human consumption (Ref. 23 ). Level II concentrations of manganese, uranium 234



### , uranium 235 

### , and ura nium 238 

### in surface water samples have been documented within the surface water flow path from sample RM

- JM

- SW to sample PR

- SW

- 01; and a zone of actual contamination is established from PPE 3 to sample PR

- SW -01— a distance of 27,800 feet (or 5.26 miles) down stream ( Ref. 12 ; Ref. 1, Section 4.1.3.3). The area beginning from the farthest downstream Level II sample location ( PR

- SW -01 ) to the 15- mile TDL is subject to potential contamination ( refer to Figure A-3 ).

EPA SI Surface Water Samples Meeting Observed Release Criteria
March 20 10

Station Location (CLP Sample No.) Distance From PPE 3 (Feet) * Hazardous Substance Bioaccumulation Potential
Factor Value

RM

- JM

- SW At PPE3 Manganese 50,000

RP

- JM

- SW

- 01 600 Manganese 50,000

RP

- SW

- 01

RP

- SW

- 01D 5,500 M anganese 5 0,00 0

PR

- SW

- 01 27,800 Manganese 50,000

* Ref. 12



### EPA E SI Surface Water Samples Meeting Observed Release Criteria April 2011

Station Location (CLP Sample No.) Distance From PPE 3 (Feet) * Hazardous Substance Bioaccumulation Potential
Factor Value

RM

- JM

- SW At PPE3 Uranium 234

Uranium 235

Uranium 238 0.5

0.5
5,000

RP

- JM

- SW

- 01 600 (PPE3) Uranium 234

Uranium 235

Uranium 238 0.5

0.5 5,000

RP

- SW

- 01

RP

- SW

- 01D 5,500 Uranium 234

Uranium 235

Uranium 238 0.5

0.5 5,000

PR

- SW

- 01 27,800 Uranium 234

Uranium 2 35

Uranium 238 0.5
0.5 5,000

* Ref. 12SW Pathway

– Human Food Chain Treat/Targets

HRS Documentation Rec ord 

### 52 Jackpile

- Paguate Uranium Mine

NMN000607033 

### - 

### Closed Fisheries

No fisheries within the surface water pathway have been closed due to manganese or ur anium 238



### contamination.

- Benthic o r Other Tissue

No benthic or other tissue samples have been collected from the surface water pathway.SW Pathway

– Human Food Chain Treat/Targets

HRS Documentation Record

D ecember 2013 

### 53 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.1.3.3.1 Food Chain Individual

The Rio Paguate ’s designated uses include cold water aquatic life, domestic water supply, fish culture, irrigation, livestock watering, wildlife habitat

, and primary contact according to the E PA (Ref. 11, p. 18). According to the Pueblo of Laguna Environmental and Natural Resources Department, Rio Paguate , the Paguate Reservoir (Mes i ta Dam) and Rio San Jose are fished for catfish, bluegill, and crappie that are caught for human consumption. The TDL extends from PPE 3 to the Rio San Jose

, to approximately where the Rio San Jose meets I nterstate 40 (refer to Figure A- 4). F ishing is documented within the 15

- mile TDL (refer to Figure A-3) ( Ref. 3, p p. 1 to 3 ; Ref. 2 3 ; Ref. 41 ). Level
II concent rations of uranium 238 

### and manganese have been established in Rio Moquino and Rio Paguate to a distance of 27,800 feet from PPE 3 to the northern part of the Paguate Reservoir (as defined by Level II surface water sample location PR

- SW -01 ) (refer to Figure A-5A ).

Fishery Type of Surface Water Body Reference(s) Rio Paguate Minimal Stream Ref

. 7, p. 14 Paguate Reservoir (northern portion) Lake Ref. 7, pp. 22 to 24



### An observed release to Rio Paguate and Paguate Reservoir by chemical analysis has been documented (Ref. 20 , pp. 22, 75, 76, 565, 566, 711, 714, 771, 775, 1185, 1191 ) . The release contained manganese with a bioaccumulation potential factor value of 5 0,0 00. In addition, the release occurred to a watershed containing Level II fisheries wi thin the target distance limit; therefore , a food chain individual value of 45 was assigned (Ref. 1, Section 4.1.3.3.1).

Food Chain Individual Factor Value: 45

4.1.3.3.2 Population

4.1.3.3.2.1 Level I Concentrations

Level I concentrations have not bee n established as fish tissue samples have not been collected ; therefore, the Level I concentrations factor value receives an assigned value of 0.

Level I Concentrations Factor Value: 0SW Pathway

– Human Food Chain Treat/Targets

HRS Documentation Record

D ecember 2013 

### 54 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.1.3.3.2.2 Level II Concentrations

Identity of

Fishery Annual
P roduction

(pounds) Type of Surface Water Body Average Annual

Flow Reference Population Value (P i ) Dilution Weight (D i )
P i x D i Rio Paguate >0, but unknown Minimal stream Less than 10 cfs Ref. 1, Tables 4

- 13,
4- 18; Ref. 15, pp. 1
to 3 0.03 1 0. 0 3

Paguate Reservoir (northern portion) >0, but unknown Lake Less than 10 cfs 1 Ref. 1, Tables 4

- 13,
4- 18; Ref. 15, pp. 1
to 3 0.03 1 0.03

Note s: cfs = cubic feet per second

1 For a lake the dilution weight is based on the sum of the average annual flows for the surface water body entering the lake (Ref. 1, Sec. 4.1.2.3.1).



### The zone of Level II contamination in Rio Paguate exten ds 27,800 f ee t from PPE 3 to the f a rthest downstream sample location, PR

- SW /SED -01 (Section 4.1.2.1.1). Rio Paguat e and the Paguate
Reservoir (Mesita Dam) are fished for catfish, bluegill

, and crappie according to the Pueblo of Laguna Environmental and Natural Resources Department , and the se fish are caught for human consumption (Ref. 23 , p. 1; Ref. 40, p. 1 )

. Data t o estimate pounds of fish caught annually fo r Rio Paguate and Paguate Reservoir are not available; however, because these water bodies are fished, the annual production is known to be greater than zero. As such, a human food chain population value of 0.03 is assigned from Table 4

- 18 of the HRS (Ref. 1, Table 4 -18). Sampling data collected from the EPA March 2010 and April 2011 sampling event s document Level II contamination in both the Rio Paguate and the Paguate Reservoir ( Ref. 1, Section 4.1.3.3.2.2; R ef. 20, pp. 22, 75, 76, 565, 566, 711, 714, 771, 775, 1185, 1191).

Rio Paguate/Paguate Reservoir - Product of P i 

### x D i 

### = 0.03 x 1

Product of P i 

### x D i 

### : 0.03

Level II Concentrations Factor Value: 0 .03SW Pathway

– Human Food Chain Treat/Targets

HRS Documentation Record 

### 55 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.1.3.3.2.3 Potential Human Food Chain Contamination

Identity of

Fishery Annual Production

(pounds) Type of Surface Water Body Average Annual

Flow Reference Population Value (P i ) Dilution Weight (D i ) P i x D i

Rio San Jose >0, but unknown Minimal stream Less than 10 cfs Ref. 1, Tables 4

- 13,
4- 18; Ref. 15, pp. 1, 4, 5 0.03 1 0.03

Paguate Reservoir (southern portion) >0, but unknown Lake Less than 10 cfs 1 Ref. 1, Tables 4

- 13,
4- 18; Ref. 15, pp. 1
to 3 0.03 1 0.03

Note s: cfs = cubic feet per second.

1 For a lake the dilution weight i s based on the sum of the average annual flows for the surface water body entering the lake (Ref. 1, Sec. 4.1.2.3.1).



### Rio San Jose and the southern portion of the Paguate Reservoir are fished for catfish, bluegill

, and crappie according to the Pueblo of Laguna Environmental and Natural Resources Department ; the se fish are caught for human consumption (Ref. 2 3 ; Ref. 41). Data to estimate pounds of fish caught annually for Rio San Jose and Paguate Reservoir are not available; however, because this water bo dy is fished, the annual production is known to be greater than zero. As such, a human food chain population value of 0.03 is assigned from Table 4

- 18 of the HRS (Ref. 1, Table 4

- 18). For Rio San
Jose , the dilution weight was based on the average annual flow data collected by the USGS at a gauging station located at Grants, New Mexico (Ref. 15 , pp. 1, 4, 5). Based on the st r eam flow, Rio San Jose, according to Table 4

- 13 of the HRS, is classified as a minimal stream and receives an assigned dilution weight of 1 (Ref. 1, Table 4-13).

For the southern portion of the Paguate Reservoir, the dilution weight was based on the sum of the average annual flows for the surface water body entering the lake. Since the Paguate flows into the Paguate Reservoir, the a verage annual flow for the Rio Paguate was also used for the southern portion of the Paguate Reservoir (Ref. 1, Tables 4

- 13, 4

- 18; Ref. 15, pp. 1

- 3). A dilution weight of 1 was also assigned to the Paguate Reservoir in accordance with Table 4 -13 of the HRS (Ref. 1, Table 4-13).

Rio San Jose /Paguate Reservoir - Product of P i 

### x D i 

### = 0.03 x 1

Product of P i 

### x D i 

### : 0.03

(Sum of Products of P i 

### x D i 

### )/10: 0.003SW Pathway

– Human Food Chain Treat/Targets

HRS Documentation Record 

### 56 Jackpile

- Paguate Uranium Mine

NMN000607033 

### 4.2 GROUND WATER TO SURFACE WATER MIGRATION COMPONENT - NOT SCORED

Section 4.2 of the HRS sta tes that the ground water to surface water component can be used to evaluate surface water threats that result from migration of hazardous substances from a source at the facility to surface water (Ref. 1). G round water in the Jackpile Sandstone interchan ges with water in the Rio Moquino and Rio Paguate through unconsolidated alluvium deposits along the steam channels

. T he ground water to surface water component is presented in this section although the surface water likelihood and potential to release as well as the threat

- targets are scored based on the overland /flood migration component as shown in Section 4.1 of this report. Since the threat of release by overland
flow or flood is more than minimal for this facility and the component score sufficient to score the overall site, this information is presented as supporting information.

In April 2011 an ESI was conducted on behalf of EPA Region 6. The ESI sampling included the collection of ground water, surface water, and surface sediments that were su bmitted to an EPA

approved laboratory for general water quality analyses (metals, anions, TDS), as well as radionuclides. Field water quality measurements, including pH, temperature, specific conductivity, dissolved oxygen, and Oxidation

- Reduction Potenti al, were collected at the time each sample was collected. Ground water elevation measurements were also collected from a wider suite of wells to gain a better understanding of the overall ground water system (Ref. 35, p. 2794). Based on data culled from several hydrologic studies from 1979 to the present, as well as the results of the 2011 ESI, a CSM was completed in July 2011 (Ref. 35, p. 2794). T he ground water and surface water systems of the facility may be described as follows:

• Hydrologic data indicate that both surface water and ground water flow from east

- northeast to west

southwest in the western half of the study area, and from north to south in the eastern half of the study

area (Ref. 35, p. 2740). • General cation/anion chemistry identi fies two distinct populations of water

– one is a sodium + potassium – bicarbonate- sulfate water that is associated with the Jackpile Sandstone, and the other is a
calcium + magnesium – carbonate -bicarbonate- sulfate water associated with the Alluvial Aquif er and surface water systems. Strong similarities between the surface water and alluvial ground water strongly suggest that these populations are in intimate contact across the facility (Ref. 35, p. 2740). • Uranium concentrations/activities increase with respect to background in both ground water and
surface water across the facility . This is demonstrated in the results of the 2011 ESI sampling event, as well as at least four studies involving surface water, and two studies involving ground water ( ( Ref. 35

, p. 2794). • Ground water, surface water, and sediment samples collected on

- site and downgradient of the facility have uranium activities that are significantly elevated with respect to background above the property (Ref. 35, p. 2783).

The hydr ologic system of the Jackpile

- Paguate Mine includes surface water, and ground waters of the Jackpile Sandstone, Alluvial Aquifer, and waters of the backfilled Paguate and Jackpile pits. Hydrologic studies indicate that these reservoirs interact with each other in a fairly complicated manner based on surface water flow rates and the hydraulic conductivities of the reservoirs where they are in contact with one another (Ref. 35, pp. 2772, 2789).

Mining activities have historically lowered ground water elevat ions in the upgradient areas of the facility , but not the downgradient areas. The cessation of mining activities, as well as the backfilling of the Paguate and Jackpile pits, has caused the ground water system to rebound. This rebound was predicted befo re the pits were backfilled; however, the rate of ground water rebound appears to be faster for the South Paguate Pit than anticipated. The models predict that ground water accumulatingSW Pathway

– Human Food Chain Treat/Targets

HRS Documentation Record 

### 57 Jackpile

- Paguate Uranium Mine

NMN000607033 

### in the pits will flow through the natural (Jackpile and Alluvium) geo logic materials, as well as waste rock and tailings, to flow into the surface water system (Ref. 25, p. 2773).

Geologic cross sections completed through the facility indicate that surface water may have flowed into the North and South Paguate pits, caus ing ground water to rebound more quickly than modeled.
Ground water elevations indicate that ground water from the North Paguate and Jackpile pits is flowing into Rio Moquino. Ground water from the South Paguate Pit appears to be flowing into Rio Paguate , and water from Rio Paguate (and/or the associated Alluvial Aquifer) may be flowing into the North Paguate Pit ( Ref. 35, pp. 2767, 2773 ).

Historical hydrologic data establish that there is hydrologic communication between surface water and both natural g round water reservoirs (Alluvial and Jackpile) at the facility . This observation is based

on ground water and surface water elevation data, aquifer pump tests, and hydrologic modeling. Cross sections using historical and recent hydrologic data also suppo rt this observation (Ref. 35, p. 2740).

The hydrologic models also predict hydrologic communication between backfilled pits and the surface

water – ground water system. Ground water is predicted to flow from the North Paguate and Jackpile pits into the Alluvial Aquifer, then into the Rio Paguate. Ground water from the South Paguate Pit is predicted to flow into the Jackpile Sandstone and the Alluvial Aquifer, with some fraction reaching Rio Paguate. This prediction is bolstered by the fact that ground water levels in several of the wells near the pits have increased up to 66 feet in the last 30 years. The rebound of the water table is due partially to the fact that mining activities, specifically pumping of water from the pit areas, ceased in 1982. Cross sections drawn through the pits illustrate the relationship between the excavated and backfilled pit conditions with respect to the most dramatically affected wells (Ref. 35, p. 2789).

Field measurements and laboratory analysis of the ground water in the Jackpile, North Paguate, and South Paguate pits indicate that chemical reactions are occurring in the backfill that mobilize uranium in very high concentrations (four to five orders of magnitude higher than background surface or ground water). Ground water in the pits appears to be rebounding at a rate much higher than pre

remedial modeling predicted; ground water in the South Paguate Pit has already rebounded 10 feet above the elevation it was projected to reach after 150 years. Hydrologic observations and modeling indicate that these pit waters are not contained and will flow into the surface water system via ground

water pathways, carrying contaminants into that system (Ref. 35, p. 2795)

.

Ground water sampling was performed as part of the April 2011 sampling activities. Analytical data from this sampling event indicated the presence of hazardous substances similar to those found in the scored sources and observed release samples evaluated for this site. Information from the April 2011
activitie s are presented in the following tables and paragraphs.SW Pathway

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HRS Documentation Record 

### 58 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Ground Water Release Sampling Locations

Station Location Sampling Location Sample Date (Military Time) Reference

EPA E SI Ground Water Sampling

– April 2011

MW -2 Monitoring well location just so uth and downgradient of Jackpile

Paguate mine. 4/21/11 ( 1023 ) Ref. 35

, p p. 8 1

, 119; Figure A

- 5B

MW -2-2 Monitoring well location just south and downgradient of Jackpile

Paguate mine (duplicate). 4/21/11 (1028) Ref. 35, pp. 81, 119; Figure A

- 5B

MW -3 Monitoring well located within the Jackpile

- Paguate mine along the north side of Rio Paguate. 4/20/11 ( 1415 ) Ref. 35

, p p. 78 , 119; Figure A

- 5B

MW -4 Monitoring well located within the Jackpile

- Paguate mine along the south side of Rio Paguate. 4/20/11 ( 13 33 ) Ref. 35

, p p. 77

- 78 , 119 ; Figure A

- 5B

MW -6 Monitoring well located south and downgradient of mine. 4/20/11 ( 1153 ) Ref. 35 , p p

. 77 , 119; Figure A

- 5B

MW

- MD Monitoring well located downgradient of Jackpile

- Paguate
mine and west of Mesita Dam. 4/20/1 1 (1030) Ref. 35

, p p. 76

- 77 , 119 ; Figure A

- 5B

MW

- MD

- 02 Monitoring well located downgradient of Jackpile

- Paguate
mine and west of Mesita Dam (duplicate). 4/20/11 (1030) Ref. 35, pp. 76

- 77, 119; Figure A

- 5B



### Background and characterization samples were collected by START

- 3 on 19 through 2 1 April 2011 (Ref . 35, pp. 72- 82; Ref. 36, p. 4 ). The samples were collected and transferred to approved sample containers in accordance with the approved QASPs (Ref. 8, p. 13; Ref. 36, p. 4). The ground water samples were collected using low flow sampling techniques and either a pneumatic pump or a bailer (Ref. 35, p. 113 ; Ref. 35 pp. 72-82 ).

The samples were analyzed using established EPA methodologies and laboratory Standard Operation Procedures (SOPs). The April 2011 samples were hand delivered to Summit Laboratory, located in Albuquerque, New Mexico on 22 April 2011 (Ref. 36, p. 4). The samples were analyzed for: isotopic

u ranium (isotopes 234, 235, and 238) by method Eichrom ACW -03- 15 and ACW

- 10; total metals by EPA method 200.7 for water and 6010B for solids; selenium by EPA method 6020; mercury by EPA method 7470A/7471A; Radium 226 

### by EPA method 903; and Radium 228 

### by EPA method 904. In addition, all water samples were also analyzed for: alkalinity by method S M2310- B; bicarbonate by
method SM

- 17 2320; carbonate by method SM 4500

- CO2D; Total Dissolved Solids by method SM
2540- C; and anions by EPA method 300 (Ref. 36, pp. 5). Once final analytical results were received,
the data underwent third

- party data review a nd validation by a START

- 3 chemist not associated with the sampling conducted at the facility (Ref. 25; Ref. 36, p. 5).SW Pathway

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HRS Documentation Record 

### 59 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Ground Water Background Sample Concentrations

Station Location Hazardous
Substance Concentration Units 1 Reference

MW -1 Uranium 234

U ranium 235

Uranium 238

Radium 228 3.74

0.161

0.826

1.26 pCi/l pCi/l pCi/l pCi/l pCi/l Ref. 35, pp. 374, 756, 1587

MW -7- 110419 Uranium 234

Uranium 235

Uranium 238

Radium 226

Radium 228 3.80

0.062

0.44

2.71

1.11 pCi/l pCi/l pCi/l pCi/l pCi/l pCi/l Ref. 35, pp. 377, 764, 1587

MW -8- 110419 Uranium 234

Uranium 235

Uranium 238 5.21

0.05 9

1.95 pCi/l pCi/l pCi/l Ref. 35, pp. 765, 1587

MW

- RM Uranium 234

Uranium 235

Uranium 238 11.6

0.733

30.0 pCi/l pCi/l pCi/l Ref. 35, pp. 780, 1587

Notes:

1 pCi/l

– picocurie per liter



### Gro und Water Non -Radioactive Characterization Sample Concentrations

Station Location Hazardous
Substance Concentration Reporting
Limit 1 Units 2 Reference

EPA ESI

– April 2011 3

MW -2- 110421 Manganese 0.275 0.00043 mg/l Ref. 35 , p p 81, 341, 15 27, 1534

MW -2-2- 110421 Manganese 294 0.430 mg/l Ref. 35

, p p. 81 , 342, 15 27 , 1534

MW -4- 110420 Manganese 32.4 0.43 mg/l Ref. 35, pp. 77

- 78, 344, 15 27

, 1534

MW

- MD

- 110420 Manganese 654 0.43 mg/l Ref. 35, pp. 76

- 77, 349, 15 27

, 1534

MW

- MD

- 02

- 110420 Manganese 693 0.43 mg /l Ref. 35, pp. 76

- 77, 348, 15 27

, 1534

Notes:

1 The Reporting Limit is defined as the LOD for the April 2011 data provided by Summit Analytical Laboratories. The LOD is equ al to the Laboratory Detection Limit which is adjusted for dilution factors (Ref. 35, p. 337). 2 ppb

– parts per billion = microgram per liter (ug/l), pCi/l = picocurie per liter

2 mg/l

– milligram per liter

3 Chemical laboratory data collected during EPA SI and ESI activities were validated by a START

- 3 chemist in accordance with EPA USEPA Contract Laboratory Program National Functional Guidelines for Inorganic Data Review (July 2002), and the Regional Protocol for Holding Times, Blanks, and VOA Preservation (April 13, 1989). Data for target analytes meet the definitive data q uality objective (Ref. 25, pp. 5, 36, 49, 74).SW Pathway

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D ecember 2013 

### 60 Jackpile

- Paguate Uranium Mine

NMN000607033 

### Ground Water Radioactive Characterization Sample Concentrations

Station Location Hazardous
Substance Concentration Reporting
Limit 1 Units 2 Reference

EPA ESI

– April 2011 3

MW -2- 110421 Uranium 234

Uraniu m 235

Uranium 238 63.5

2.23

54.2 0.051

0.012

0.042 pCi/l
pCi/l pCi/l Ref. 35, pp 81, 757 , 1587

MW -2-2- 110421 Uranium 234

Uranium 235

Uranium 238 62.7

2.49

54.4 0.054

0.033

0.035 pCi/l pCi/l
pCi/l Ref. 35, pp. 81 , 758, 1587

MW -3- 110420 Uranium 234 17.7 0.04 6 pCi/l Ref. 35, pp. 78, 1587

MW -4- 110420 Uranium 234

Uranium 235

Uranium 238 119

4.58

108 0.038

0.011

0.038 pCi/l pCi/l pCi/l Ref. 35, pp. 77

- 78, 762, 1587

MW -6- 110420 Uranium 234

Uranium 235

Uranium 238 73.2

2.62

61.8 0.010

0.011
0.050 pCi/l pCi/l pCi/l Ref. 35, pp. 77, 763, 1587

MW

- MD

- 110420 Uranium 234

Uranium 235 31.3

1.00 0.036
0.033 pCi/l pCi/l Ref. 35, pp. 76

- 77, 767, 1587

MW

- MD

- 02

- 110420 Uranium 234

Uranium 235 29.1

1.06 0.185

0.091 pCi/l pCi/l Ref. 35, pp. 76

- 77, 766, 1587

Notes:

1 Reporting Limit is the MDC which is the net concentration that has a specified chance of being detected (Ref. 39, p. 3).

2 pCi/l

- picocurie per liter

3 Radiological data were validated by a START

- 3 Certified Health Physicist with 30 years of radiation characterizat ion experience. Data for target analytes meet the definitive data quality objective (Ref. 35, p. 1587; Ref. 36, p. 5).



### The ground water and surface water samples both contain the same contaminants , further bolstering the interaction between the pathways

. Uranium 234 

### , uranium 235 

### , uranium 238 

### , and manganese were found at concentrations exceeding established background concentrations within ground water and surface water samples. If this analytical data were to be used to establish an observed release by ch emical analysis, Level II concentrations of uranium 234 

### , uranium 235 

### , uranium 238



### , and manganese would be established in Rio Moquino and Rio Paguate to a distance of 27,800 feet from samples RM

- JM

- SW and RP

- JM

- SW 1 

### to the Paguate Reservoir (as defined by Level II surface water sample location PR

SW -01) (refer to Section 4.0 and Figure A-3A ).

1 Sampling location RP

- JM

- SW is in Rio Paguate, within the property, just upstream of its confluence with Rio Moquino
and 8,6 00 feet east of the Jackpile

- Paguate Mine boundary (Ref. 12). March 2010 EPA SI surface water sample RP

- JM

- SW
collected at that location contained 0.14 mg/l manganese (reporting limit 0.01 mg/l) (Ref. 19, p. 21; Ref. 20, pp. 726, 777; Ref. 25, pp. 1 to 5 ). April 2011 EPA ESI surface water sample RP

- JM

- SW

- 110420 collected at that location contained 28.476 pCi/l uranium 234 ( reporting limit 0.056 pCi/l), 1.071 pCi/l uranium 235 (reporting limit 0.043 pCi/l), and 24.247 pCi/l
uranium 238 (reporting limit 0.075 pCi/l) (Ref. 35, pp. 94

- 95, 746, 776, 1587 ). Each of these concentrations meet s observed
release criteria described in S ection 4.1.2.1.1 above.Soil Exposure Pathway

– Not Scored

HRS Documentation Record 

### 61 Jackpile

- Pagua te Uranium Mine
NMN000607033 

### 5.0 SOIL EXPOSURE PATHWAY SCORE - NOT SCORED

The soil exposure pathway will not be scored because it would not significantly affect the overall site

score . Further, th e site score exceeds 28.50 based only on the evaluation of the surface water pathway.Air Pathway

– Not Scored

HRS Documentation Record 

### 62 Jackpile

- Paguate Uranium Mine
NMN000607033 

### 6.0 AIR MIGRATION PATHWAY SCORE - NOT SCORED

The air migration pathway will not be scored because it would not significantly affect the overall site

score . Further, th e site score exceeds 28.50 based only on the evaluation of the surface water pathway.HRS Documentation Record

D ec ember 2013 

### 63 Jackpile

- Paguate Uranium Mine

NMN000607033 

# Attachment AFIGURE A-1 SITE LOCATION MAP JACKPILE-PAGUATE URANIUM MINE

SR 279 Laguna Pueblo

Paguate, Cibola County, New Mexico 

### USEPA REGION 6
START - 3

DATE

MAY 2010 PROJECT NO SCALE

AS SHOWN 20406.012.019.0514.01

File: \\fsdtx03\IT\GIS_Projects\brownm\Jackpile\HRS\Figure A-1, 23-June 2011, brownm Source: Microsoft Virtual Earth Roads, 2009
CERCLIS: NMN000607033
SSID: A6T3
TDD: TO-0019-10-02-02 

### New Mexico Site Location

LEGEND

Approximate Mine Area 0 2 0 10

SCALE IN MILES 

### Approximate site area (which includes sources and zones of contamination) derived from NGS USA Topographic Maps of Jackpile Mine area outlined at 1:60,000 scale

### Appproximate site area (which includes sources and zones of contamination) derived from NGS USA Topographic Maps of Jackpile Mine area outlined at 1:60,000 scale. Approximate Source Locations derived from Refernces 28, 29 and 33.

File: C:\Program Files\fsdtx03\IT\TGIS_Projects\brownm\Jackpile\HRS\Figure A-2)101411.mxd, 14-October 2011, brownm 

## USEPA REGION 6
START-3

DATE PROJECT NO SCALE

AS SHOWN OCT 2011 20406.012.019.0514.01 

### FIGURE A-2
SITE LAYOUT MAP
JACKPILE-PAGUATE URANIUM MINE SR 279 Laguna Puablo

Paguate, Cibola County, New Mexico 0 0.4

SCALE IN MILES

DISCLAIMER: THIS FIGURE IS PREPARED FOR REFERENCE PURPOSES ONLY AND SHOULD NOT BE USED, AND IS NOT INTENDED FOR, SURVEY
OR ENGINEERING PURPOSES. TDD NO: TO-0019-10-02-02
CERCLA NO: NMN000607033
SSID: A6T3

SOURCE: Microsoft Virtual Earth Roads, 2009 

### South Paguate Pit North Paguate Pit

Jackpile Pit

Waste Dump V R

i o

M o q u i n o



### R

i 

### o 

### P 

### a g u a 

### t e New Mexico

R
i o P a g u a

t e 

### LEGEND

Approximate Mine Boundary

River

Waste Dump

Open Pit

0

. 8Appproximate site area (which includes sources and zones of c ontamination) derived from NGS USA Topographic Maps of Jackpile Mi ne area outlined at 1:60,000 scale. Approximate Source Locations derived from Refernces 28, 29 and 33. Copyright: ' 2010 National Geographic Society

File: C:\Program Files\fsdtx03\IT\TGIS_Projects\brownm\Jackpile\HRS\Figure A-3_101411.mxd, 14-October 2011, brownm " ""



## USEPA REGION 6
START-3

DATE PROJECT NO SCALE

AS SHOWN OCT. 2013 20406.012.019.0514.01 FIGURE A-3
SURFACE WATER PATHWAY MAP
JACKPILE-PAGUATE URANIUM MINE SR 279 Laguna Puablo

Paguate, Cibola County, New Mexico 0 1.25

SCALE IN MILES

DISCLAIMER: THIS FIGURE IS PREPARED FOR REFERENCE PURPOSES ONLY AND SHOULD NOT BE USED, AND IS NOT INTENDED FOR, SURVEY
OR ENGINEERING PURPOSES. TDD NO: TO-0019-10-02-02
CERCLA NO: NMN000607033
SSID: A6T3

SOURCE: NGS USA Topographic Maps 

# o South Paguate Pit North Paguate Pit Jackpile Pit Waste Dump V

New Mexico

R
i o

P a g u a

t e LEGEND

Approximate Mine Boundary

River

Probable Point of Entry (PPE)

Level II Sample Locations

Waste Dump

Open Pit

Overland Flow Direction

Level II Documented Fishery

Potential Documented Fishery

Target Distance Limit (TDL)

Surface Water Flow Direction



# X Y PPE 3

Level II Documented Fishing Area

Potential Documented Fishing Area 

# X Y

R i o

S

a

n J o

s

e Paguate Reservoir RM-JM-SW

RP-JM-SW-01

RP-SW-01

RP-SW-02

RP-SW-03

PR-SW-01 Mesita Dam Paguate Lake

2

. 5

## USEPA REGION 6
START-3

DATE PROJECT NO SCALE FIGURE A-4
15-MILE TARGET DISTANCE LIMIT
JACKPILE-PAGUATE URANIUM MINE

SR 279 Laguna Pueblo

Paguate, Cibola County, New Mexico

OCT. 2013 20406.012.001.0222.01

File: \\fsdtx03\IT\GIS_Projects\brownm\Jackpile\HRS\Figure A-4, 23-September-2011, brownm Source: NGS USA Topographic Maps
CERCLIS: NMN000607033
SSID: A6T3
TDD: TO-0019-10-02-02 

# £

"

NEW MEXICO

NOT TO SCALE 

## X Y 0 4

. 5 2.25

SCALE IN MILES Rio Moquino

Rio San Jose Paguate Reservoir Rio Paguate

LEGEND

Approximate Mine Boundary Probable Point of Entry (PPE) Surface Water (SW) Pathway Target Distance Limit (TDL)
Flow Direction

Approximate site area (which includes the sources and zones of contamination) derived from NGS USA Topographic Maps of Jackpile Mine area outlined at 1:60,000 scale 15 Mile Target Distance Limit from furthest downstream PPE (PPE3) PPE3 

# X Y

Mesita Dam

### JPOP41N

40

File: \\fsdtx03\IT\GIS_Projects\brownm\Jackpile\Figure 3-1, 8-March-2011, brownm 

## USEPA REGION 6
START-3

DATE PROJECT NO SCALE

AS SHOWN JULY 2011 20406.012.019.0603.01 

### FIGURE A-5B
EXPANDED SITE INSPECTION

SAMPLE LOCATION MAP
JACKPILE-PAGUATE URANIUM MINE ESI

SR 279 Laguna Pueblo

Paguate, Cibola County, New Mexico 0 1

SCALE IN MILES

DISCLAIMER: THIS FIGURE IS PREPARED FOR REFERENCE PURPOSES ONLY AND SHOULD NOT BE USED, AND IS NOT INTENDED FOR, SURVEY
OR ENGINEERING PURPOSES. 

### LEGEND

Approximate Mine Boundary Surface Water (SW) Pathway SW and Sediment Sample
Location Monitoring Well Sample Location
SW and Sediment Background Sample Location Monitoring Well Background Sample Location Sample Name NEW MEXICO

Source: NGS USA Topographic Maps
CERCLIS: NMN000607033
SSID: A6T3
TDD: TO-0019-10-11-01 

### Paguate Reservoir Rio Paguate

Rio San Jose 

### RP-SW-BG RM-SW-BG MW-RM

MW-8 RM-JM-SW

RP-JM-SW RP-JM-SW-01

RP-SW-01

RP-SW-02

RP-SW-03

PR-SW-01 RP



### MW-MD SPOP35 MW-1

NPOP20E

MW-6 MW-7

MW-2 MW-4

Approximate site area deriverd from NGS Topographic Maps of Jackpile Mine area outlined at 1:60,000 scale. MD-SW MW-3

2