;REVISED 6 ENVIRONMENTAL REPORT , GEOLOGIC CROSS SECTIONS ... · REVISED ENVIRONMENTAL REPORT...

- .. ADDENDUM TO THE. 4 1. 6 ;REVISED ENVIRONMENTAL REPORT

, GEOLOGIC CROSS SECTIONS- -AND AQUIFER INFORMATION

F/ 4 Forthe~ V SWEETWATER URANIUM PROJECT

Sweetwater County, Wyoming

Z tE 7Source Material License~42 SUA-1360

Submitted To:Nuclear ReguLatory Commission

S . _._,_.. _Rockville_ Maryland

Submitted By.Kennsoott Uranium Company

P.O. Box 160a .. n.y•-- toming 82301

_ _ Prepared By.Shepherd Miller, Inc

~ 1600 8pecht Point Drivei1~j,,j Fort Collins Colorado 80625

August 1996

Sweetwater Uranium FacilityKennecott Uranium Company42 Miles NW of RawlinsP.O. Box 1500Rawlins. Wyoming 82301(307) 328-1478 Fax: (307) 324-4925

August 10, 1995 KennecottEnergy

Mr. Joseph J. Holonich, ChiefHigh-Level Waste and Uranium

Recovery Projects Branch, MS-T-7-J-9Division of Waste ManagementOffice of Nuclear Safety and SafeguardsU. S. Nuclear Regulatory CommissionWashington, D.C. 20555-0001

Dear Mr. Holonich:

Subject: Source Materials License SUA-1350 - Addendum to the Revised EnvironmentalReport - Geologic Cross Sections and Aquifer Information

Enclosed please find a copy of a document entitled 'Addendum to the Revised EnvironmentalReport - Geologic Cross Sections and Aquifer Information". This document was prepared inresponse to comments on Kennecott Uranium Company's August 1994 submittal entitled'Revised Environmental Report, Sweetwater Uranium Project, Sweetwater County, Wyoming",raised by members of your staff in a meeting at your offices in Rockville, Maryland onFebruary 23, 1995, and to Comments 1 and 2 in a letter from Dan Gillen of your office datedMay 3, 1995.

This document has been discussed with Charlotte Abrams of your staff. If you have anyquestions please do not hesitate to contact me.

oSincerely

yours,

scar A. Pau onFacility Supervisor

Enclosure

cc: Lcharlotte Abrams 7Licensing Project Manager (2)Director, DRSS, Region IVMichael H. GibsonPat Lorello

Kennecott Uranium Company is Manager of the Green Mountain Mining Venture

Kennecott Energy Company provides marketing and other services on behalf of Cordero Mining Company.

Antelope Coal Company. Spring Creek Coal Company and Kennecott Uranium Company.

ADDENDUM TO THE

SWEETWATER URANIUM PROJECT

REVISED ENVIRONMENTAL REPORT

GEOLOGIC CROSS SECTIONS AND AQUIFER INFORMATION

Sweetwater County, Wyoming

Source Materials License SUA-1350

Prepared for:

Kennecott Uranium Company

P. 0. Box 1500

Rawlins, Wyoming 82301

Prepared by:

Shepherd Miller, Inc.

1600 Specht Point Drive

Fort Collins, Colorado 80525

August 1995

TABLE OF CONTENTSADDENDUM TO THE SWEETWATER ENVIRONMENTAL REPORT

GEOLOGIC CROSS SECTIONS AND AQUIFER IN4FORMATION

Executive Summary............................................ 1

1.0 Introduction................................................. 2

2.0 Geologic Cross Sections.......................................... 3

3.0 Aquifer Information............................................ 3

4.0 Ground Water Well Completions.......... ... . . . .. . . . .4

References.................................................. 9

List of Tables

Table 1 Monitor Well Completion Data........ ....................................... 5

Figure 1Figure 2

List of Figures

Geologic Borings LocationsLocation of Geologic Cross Sections

List of Drawings

Drawing 1 Geologic Cross Sections

List of Attachments

Attachment 1 Geophysical Logs

Kennecott Uranium Company SUA-1350Addendum to Revised Environmental Report - Submitted to NRC

Page i Revision 2August 10, 1995

Executive Summary

A revised Environmental Report for the Sweetwater Uranium Facility was prepared andsubmitted to the Nuclear Regulatory Commission (NRC) in August 1994. NRC staffreviewed the revised Environmental Report and requested additional information to clarify orexpand the contents of the document in a meeting on February 23, 1995 and in a letter fromDan Gillen, dated May 3, 1995.

This addendum to the Environmental Report addresses Comments 1 and 2 of the letter.Other submittals have or will address the remainder of the comments. NRC in Comment 1recommends the provision of a description of aquifer units within the Battle Spring aquifer.NRC in Comment 2 also recommends a description of well completion data for existing sitemonitor wells. This addendum presents geologic cross sections based on geophysical logsprepared during site exploration or in establishing monitor wells. A perched aquifer andupper and lower saturated portions of the Battle Spring Aquifer are identified throughinterpretation of the geologic cross sections. Aquifer information presented in theEnvironmental Report is summarized. A table in this document provides the screenedinterval and notes the unit in which the well is completed.


Page 1 Revision 2August 10, 1995

1.0 Introduction

The geology of the area surrounding the Sweetwater Uranium Facility has been defined inprevious submittals to the Nuclear Regulatory Commission, originally in the 1976Environmental Report by Woodward-Clyde, and subsequently in 1977 and 1981 Dames &Moore reports. The site geology was summarized in the 1994 revised Environmental Reportbased on review of these documents.

The Sweetwater site is situated above the Battle Spring Formation, described in theEnvironmental Report (1994) as a typical deltaic fanglomerate, consisting of intercalated andinterfingered beds of arkosic sandstone, siltstone, and mudstone. The sandstones are fine- tocoarse-grained, slightly clayey, and poorly sorted. Further, the sandstones are lenticular,often bounded by interchannel deposits of siltstone and mudstone. These sandstone lensesare enclosed by finer clastics, which form relatively impermeable barriers to downwardmovement of water. While there is some continuity in the lateral extent of the layers of fineclastics (siltstones and claystones), alluvially deposited sandstone lenses prevent these layersfrom remaining continuous.

Photograph 1 is of the Sweetwater open pit wall displaying approximately 110 feet(vertically) of the Battle Spring Formation. (Note: the dark uneven line a little more thanhalfway down from the ground surface is a bench which collects colluvium and water). Thephotograph reveals the relatively large number and discontinuous nature of thesiltstone/claystone layers. The photograph shows how the lateral extent of the claystone isdisrupted by lenses of lighter colored sandstone.

Photographs 2 and 3 are close-up views of claystone lenses. Photograph 2 is of a wall of thebench located at the south end of the open pit and also displays the discontinuous nature ofthe claystone lenses. Photograph 3, taken in the former ramp to the pit, shows a relativelythick clay lens "pinched out" by a sandstone deposit. Development of geologic crosssections presented herein was based on interpretation driven in part by characteristics evidentin this photographic record of site geology.

This letter report presents geologic detail for the near vicinity of the existing Sweetwatertailings impoundment. The detail derives from a series of exploration drillings, geotechnicalborings, and well borings completed from 1976 to 1987. Based on this data this reportpresents a discussion of site stratigraphy, geologic cross sections, and a description of theground water regime, including a perched aquifer, and upper and lower portions of the BattleSpring Aquifer. This report also summarizes aquifer properties for the Battle Spring Aquifer.Lastly, well completion data for all monitor wells and copies of the geophysical logs of thelogged borings are also presented.



Photograph 1. Sweetwater Open Pit Wall.

Photograph 2. Claystone Lenses in Bench Wall to the South of the Open Pit.



Photograph I Single Claystone Lens in Former Ramp to Open Pit.



2.0 Geologic Cross Sections

Figure 1 shows the location of boreholes near the existing Sweetwater tailings impoundmentand differentiates between exploration borings, geotechnical borings, original tailings monitorwells, water source wells, deep aquifer wells, shallow aquifer wells, and perched aquiferwells. Geophysical data were collected during several of these borings. The geophysicallogging included gamma, spontaneous potential (SP), and resistivity to distinguishstratigraphic layering in the vicinity of the tailings impoundment.

Following review of the locations Of boreholes with geophysical data four cross section lineswere selected to comprise as many of the borings with geophysical data as possible.Geologic cross sections were then created based on interpretation of the geophysical data,cross-referenced to lithologic logs. Drawing 1 presents the interpreted geologic crosssections and also provides a plan view showing the locations of the cross sections relative tothe tailings impoundment and boring locations (this plan view is also presented as Figure 2).Each of the geophysical logs is included in Attachment 1. Lithologic logs were generatedbased on cuttings and are not considered to be as accurate as the geophysical logs.

Correlations between borings were also based on an understanding of the general site geologyand a review of the geologic record available in observation of the pit wall, as shown inPhotographs 1 through 3. Initially, it appeared that many of the units were correlative acrossthe site based on the geophysical/lithologic logs. However, a review of photographs of thepit walls indicated that the fine-grained layers (silt/clay) are discontinuous across the lengthof the pit wall. In some cases, silt/clay layers are cut and removed by sand-filled, sub-gradestream channels. In these instances, the silt/clay lenses resume at the same elevation after adistance of approximately 50 feet. The interpretation that the fine layers are discontinuouswas used to construct the cross sections as much as possible. The cross sections verifyprevious observations that the Battle Spring Formation in the site vicinity is composed ofinterfingered layers of sandstone and silt- or claystone.

3.0 Aquifer Information

The Battle Spring Aquifer is located immediately beneath the Sweetwater tailingsimpoundment, at a depth of approximately 100 feet. As described above, the Battle SpringFormation is composed of discontinuous layers of alluvial sandstones and finer clastics(siltstone and claystone). As stated in the Environmental Report (1994), the sandstone unitsof the Battle Spring Formation behave as a multiple leaky confined aquifer system, with thedrawdown in each aquifer in response to pumping being more or less independent of the headin the overlying or underlying aquifers. This behavior results from the fairly discontinuouslayers of clay materials, which inhibit vertical movement of water.

Therefore, on a localized basis, a number of separated water-storing units exist within theBattle Spring Aquifer. Additionally, the presence of claystone layers above the Battle SpringAquifer allows seepage to be perched in certain locations.



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As documented in the Environmental Report (1994), an incursion from the tailingsimpoundment occurred in 1984, allowing tailings fluid to seep into the ground adjacent to theimpoundment. In the vicinity of the tailings impoundment, two claystone layers create threelocalized water-storing units. Each of the three units is identified where appropriate on thecross sections on Drawing 1. The first, located to the north and west of the impoundment, isa perched aquifer. This perched layer is situated above a fairly continuous claystone layerlocated approximately 50 to 70 feet below the ground surface. The approximate areal extentof the perched aquifer is estimated as shown in Figure 2 (also the plan view map on Drawing1). As of September 1989 available fluid present in the perched aquifer had been pumpedout and returned to the tailings impoundment. Therefore, the perched aquifer is no longersaturated.

The other two localized aquifer units are within saturated sands of the Battle Spring Aquifer,separated by another fairly continuous claystone layer approximately 150 to 200 feet belowthe ground surface (see Drawing 1). The upper saturated sand of the Battle Spring Aquiferis approximately 50 feet thick. The lower saturated sand of the aquifer exists below 150 feetfrom the ground surface. Water quality sampling of three wells completed within the lowersaturated sand, TMW's 8, 24 and 47, shows it to be unaffected by seepage from the cell,indicating that flow from the upper to lower saturated sands is retarded by the claystonelayer. These three wells have been completed at depths of approximately 200 to 240 feet, asstated in the 1994 Environmental Report.

The current (April 1995) piezometric surface for the saturated portion of the Battle SpringAquifer is shown in blue on the cross sections in Drawing 1. Additionally, the perimeter ofthe tailings impoundment, the approximate tailings surface, and the current tailings fluid level(6,621 feet above mean sea level) are depicted on Drawing 1.

The average horizontal conductivity of the Battle Spring Aquifer, as stated in theEnvironmental Report (1994), is probably on the order of 1 x 102- ft/min and verticalconductivity probably on the order of 1 x 10- ft/min. Potable water wells, Drake-i, PWW-1and PWW-2, have been drilled in the Battle Spring Aquifer to provide water to the site.Water quality in these wells is good, with water quality data provided in the 1994Environmental Report. Pumpback wells, as part of the ground water Corrective ActionProgram, have historically pumped at annualized average rates of up to 11 gpm.

4.0 Ground Water Well Completions

Monitor wells around the tailings impoundment have been completed in each of the threelocalized aquifer units discussed above (perched aquifer and upper and lower saturated sandsof the Battle Spring Aquifer). Table 1 summarizes for each well the zone in which it wascompleted and the depth of the screened interval. Additionally, Figure 1 displays thelocations of each of these monitor wells and denotes the zone of completion by symbol. Thecompletion zones are also shown on the cross sections in Drawing 1 with widened lines overthe vertical boring line.



Table 1. Monitor Well Completion DataWell Number Completion Screen Interval

(TMW-) Zone (Feet from ground surface)

1 Aquifer 160 - 260, 280 - 300

2 Aquifer 135 - 295, 295 - 300

3 Aquifer 100 - 267

4 Aquifer 100 - 267

5 Aquifer 100 - 267

6 Aquifer 100 - 267

8 Deep Aquifer 220 - 240

15 Aquifer 78 - 128

16 Aquifer 120- 145

17 Aquifer 100- 150

18 Aquifer 96- 146

19 Perched 20 - 38

20 Perched 39 - 59

21 Perched 33 - 53

22 Perched 28 - 48

23 Perched 15 - 44.5


29 Aquifer 100- 150

30 Perched 18.5 - 38.5

31 Aquifer 99.5 - 149.5

34 Perched 24.7 - 35.7

35 Aquifer 97- 147

36 Aquifer 96- 146

37 Aquifer 88.5- 138.5

44 Aquifer 85 - 135

45 Aquifer 85 - 135


48 Aquifer 100- 150

49 Aquifer 100- 150

50 Aquifer 100- 150

51 Aquifer 110 - 160

52 Aquifer 100- 150

53 Aquifer 100- 150



Table 1. Continued

Well Number Completion Screen Interval(TMW-) Zone j (Feet from ground surface)

54 Perched 49 - 75

55 Perched 43.5 - 58.5

56 Aquifer 87- 137

57 Aquifer 87 - 137

58 Aquifer 87 - 137

59 Aquifer 90- 138

61 Aquifer 100- 150

62 Aquifer 100- 150

63 Aquifer 110 - 130

64 Aquifer 97 -147

65 Perched 54.7 - 77.7

66 Perched 58 - 68

67 Perched 54 - 72

68 Perched 76 - 91

69 Aquifer 100- 150

70 Aquifer 100- 150

71 Aquifer 100- 150

74 Perched 42.5 - 62.5

75 Aquifer 97 - 147

76 Perched 46 - 76

77 Perched 15.5 - 30.5

78 Aquifer 99- 149

79 Perched 48 - 60

80 Perched 57 - 82

81 Perched 37.5-47.5

82 Aquifer 100- 150

83 Perched 40 -65

84 Aquifer 97 - 147

85 Perched 50 - 90

86 Perched 71.5 - 89.5

87 Perched 64 - 88

88 Perched 62.5 - 85.5

89 Aquifer 100- 150



REFERENCES

Dames & Moore, 1977. "Revised Final Report on Design of Tailings Retention Basin,Sweetwater Uranium Project, Sweetwater County, Wyoming," prepared for MineralsExploration Company.

Dames & Moore, 1982. "Report of Engineering Design Study, Tailings Disposal System,Sweetwater Uranium Project Near Rawlins, Wyoming," prepared for MineralsExploration Company.

Shepherd Miller, Inc., 1994. "Revised Environmental Report, Sweetwater Uranium Project,Sweetwater County, Wyoming," prepared for Kennecott Uranium Company.

Woodward-Clyde Consultants, 1976. "Environmental Report, Sweetwater Uranium Project,Sweetwater County, Wyoming," prepared for Minerals Exploration Company.



ATTACHMENT 1

GEOPHYSICAL LOGS

CRE-18766664.90

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500

575 I0 150

SHEPHERD MILLERWCOCAF•AT"D

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Date: AUG. 1995Project: 06-442

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RE-559

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RE-559GEOPHYSICAL LOG


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THICK LINE DENOTESWELL COMPLETION ZONES

SCALE IN FEET

300

050 I0 100

SHEPHERD MILLERvowOATEDl

TMW-1GEOPHYSICAL LOG

Date: JUNE 1995

Project: 06-442

File: TMW1C_5

TMW-16

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-THICK LINE DENOTESWELL COMPLETION ZONES

SCALE IN FEET

mmmmmýý mmmmmmý550 I0

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Date: JUNE 1995

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File: TMW16C-5

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SHEPHERD MILLERNC!T


Date: JUNE 1995

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File: TMW18C_5

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File: TMW61C

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Project: 06-442

File: TMW50C-5

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170

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CRE-1877

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I I75 0 I150

TMW-89

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SHEPHERD MILLER


Date: JUNE 1995

Project: 06-442File: TMW89C

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50 0 100

150 I0 II 00

CRE-1873

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75 0I150

TMW-17

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Project: 06-442File: TMW1 7C-5

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File: TMW47C 5

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DM-4GEOPHYSICAL LOG I Date: JUNE 1995

Project: 06-442File: 4C

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I0II15075

SHEPHERD MILLER


Date: AUG. 1995

Project: 06-442File: RE108C

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=6?%Wm6pý 11150775 I0

SHE•PIHRD MILLER

PWW- 1GEOPHYSICAL LOG

] Date: JUNE 1995Project: 06-442

File: PWW1C

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File: TMW62C_5I

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SHEPHRD MLLER


Date: AUG. 1995

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File: TMW8C_5

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CRE-4047GEOPHYSICAL LOG

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File: CRE4047C

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Date: AUG. 1995

Project: 06-442

File: TMW53C5

TMW-49

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0550 I0 10

SHEPES O-GP C AAT UD E


Date: JUNE 1995

Project: 06-442

File: TMW49C_5

DH-4

0' - ELEV 6636.00

RESISTIVITY

SCALE IN FEET

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SHEPH ERD M IL LEDH-4

GEOPHYSICAL LOG

D1te: JUNE 1995

Proiject: 06-442

File: DH_4C

;REVISED 6 ENVIRONMENTAL REPORT , GEOLOGIC CROSS SECTIONS ... · REVISED ENVIRONMENTAL REPORT...

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