Department of Energy

Department of Energy

Washington, DC 20585

May 16, 2017

To: Distribution

Subject: June 2017 Environmental Sampling at the Durango, Colorado, Processing and Disposal Sites

The purpose of this letter is to inform you of the upcoming sampling event at Durango, Colorado. Enclosed are the maps and tables specifying sample locations and analytes for monitoring at the Durango disposal and processing sites. Water quality data will be collected from monitoring wells and surface-water locations at these sites as part of the routine environmental sampling currently scheduled to begin the week of June 5, 2017. The sampling at the disposal cell will be carefully coordinated with the construction activities associated with evaporation pond removal. We will notify you of the exact date and time the week before the scheduled sampling.

The following lists show the monitoring wells (with zone of completion) and surface-water locations scheduled to be sampled during this event.

MONITORING WELLS DUROJ Mill Site 612 Al/Km 630 Al/Km 631 Al/Km 617 Al

633 Km

634Km

635 Km

863 Al

DUR02 Rajjinate Pond 594 Mf 598 Mf/Pl 607 Al

879Mf 884 Al

DUR03 Bodo Canyon

605 Cf

607 Cf

608 Al

612 Km 618 Al

621 Cf

623 Al

SURFACE LOCATIONS

DUROJ Mill Site

584

586

652

691

DUR02 Raffinate Pond

588

654

678

All samples will be collected as directed in the Sampling and Analysis Plan for US. Department ofEnergy Office ofLegacy Management Sites. Access agreements are being reviewed and are expected to be complete by the beginning of fieldwork. All analytes and locations were selected based on the site regulatory documents (Processing Site- Groundwater Compliance Action Plan; Disposal Site- Long-Term Surveillance and Maintenance Plan).

;u1v1ssol

Distribution

-2-

May 16, 2017

Please contact me at (970) 248-6016 if you have any questions. Please send any correspondence to :

U.S. Department of Energy Office of Legacy Management 2597 Legacy Way Grand Junction, CO 81503

Sincerely,

Enclosures

Distribution: J. Whited, NRC G. Brand, SJBHD M. Cosby, CDPHE W. Naugle, CDPHE

cc w/o enclosures: D. Miller, Navarro (e) File: DUD 400.02 (re grand junction)

DUP 400.02 (re grand junction)

Sampling Events- DVPs-VMRs/Sampl ing Event- Durango June 2017.docx

Sampling Frequencies for Locations at Durango, Colorado

Location

ID

Quarterly Semiannually

Monitoring Wells

DUR01 Mill Tailings

612

617

630

631

633

634

635

859

863

DUR02 Raffinate Pond

594

596

598

607

879

884

888

889

890

DUR03 Bodo Canyon

605

607

608

612

618

621

623

MW-1

NVP

P7

Surface Locations

DUR01 Mill Tailings

584

586

652

691

DUR02 Raffinate Pond

588

654

678

Sampling conducted annually in June .

Annually

x x x x x x x

x

x

x x x x

x x x x x x x

x x x x

x x x

Biennially Not Sampled

Notes

Download datalogger Download datalogger

x

Download datalogger

Download datalogger

Se and U ONLY

x

Download datalogger

Se and U ONLY

Se and U ONLY

Se and U ON LY

Se and U ONLY

x

Download datalogger

x

Download datalogger

x

Download datalogger

POC WELL

11

11

"; supplements 608

11

BACKGROUND

x

Download datalogger

x

Download datalogger

x

Download datalogger

RIVER RIVER

RIVER RIVER; replaced 0656

Constituent Sampling Breakdown

Site

Durango

Analyte

Required Detection Groundwater Surface Water Limit (mg/L) Analytical Method

Approx. No. Samples/yr

20

7

Field Measurements

Total Alkalinity

x

x

Dissolved Oxygen

Redox Potential

x

x

pH

x

x

Specific Conductance

x

x

Turbidity

x

Temperature

x

x

Laboratory Measurements

Aluminum

Ammonia as N (NH3-N)

0612 &0863

Cadmium

only

x

0 .001

SW-846 6020

Calcium DUR03 only

5

SW-846 6010

Chloride DUR03 only

0 .5

SW-846 9056

Chromium

Gross Alpha

Gross Beta

Iron DUR03 only

0.1

SW-846 6020

Lead

Magnesium DUR03 only

5

SW-846 6010

Line Item Code

LMM -02 LMM-01 MIS-A-039 LMM - 01 LMM-01

All Mill Tailings Areas and Bodo Manganese Canyon locations

0.005

SW-846 6010

LMM-01

All Mill Tai ling s

Areas and Bodo

Molybdenum Canyon locations

x

Nickel

Nickel-63 Nitrate+ Nitrite as N (N03+N02)-N

Potassium DUR03 only

Radium -226

Radium-228

Selenium

x

x

Silica

Sodium DUR03 only

Strontium

0 .003

SW-846 6020

LMM-02

1

SW-846 6010

LMM-01

0 .0001 1

SW-846 6020 SW-846 6010

LMM-02 LMM - 01

All Mill Tailings Areas and Bodo Sulfate Canyon locations

Sulfide

Total Dissolved Solids DUR03 only

Uranium

x

x

Vanadium

Zinc

Total No. of Analytes

13

4

0.5

10 0 .0001

SW-846 9056

MIS-A-044

SM2540 C SW-846 6020

WCH-A-033 LMM -02

Note: All private well samples are to be unfiltered . The total number of analytes does not include field parameters.

LEGEND

? ?

Groundwater Monitoring Well Surface Water Monitoring Location

Site Boundary

0

600

1,200

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OFFICE OF LEGACY MANAGEMENT Under DOE Contract Number DE-LM0000421

Planned Sample Locations Durango, CO, Processing Sites

June 2017

DATE PREPARED:

April 19, 2017

FILE NAME :

S1288900

LEGEND

?

Groundwater Monitoring Well (Specified in the LTSP)

?

Point-of-Compliance Well (Specified in the LTSP)

I. _ : Site Boundary

llLMlesslEnvProjectslEBMILTSI 11110001I1610041$160621$1606200-11x17.mxd smithw 04/20/2017 1O:12:33 AM

0

300

600

.~~~~~5iiiiiiiiiiiiiiiiiiiiiiiiiiiiiil Feel

OFFICE OF LEGACY MANAGEMENT

Groundwater Mon itoring Wells

Planned Sample Locations

Durango, CO , Disposal Site

June 2017

DATE PREPAR ED:

April 20, 2017

FILE NAM E:

S1606200-11x17

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