Anaconda - What’s happening at the Site?

Below is a brief overview of what is currently planned to happen at the Anaconda Copper Mine Site (ACMS) over the next three months. Following that, are highlights of what has been accomplished at the site over the past three months.

If you would like to see additional information added to this page or have any other suggestions, please email the NDEP ACMS team at acms[at]ndep.nv.gov.

This page was last updated: April 5th, 2019.

What will be happening in the next three months:

April:

The OU-1, OU-4a, and OU-7 Draft Human Health Risk Assessment (HHRA) and Screening Level Ecological Risk Assessment (SLERA) Work Plan submittal from the Atlantic Richfield Company (ARC) is due later this month.

NDEP will collect comments from stakeholders on ARC’s CMU 2, and 6 Fluid Management System (FMS) Ponds Draft Design Report.  Stakeholder comments are due April 8th. NDEP will provide collated comments and direction to ARC regarding the Draft Design Report later in the month. This Report details the engineering plans and work required for OU-8 FMS pond construction, planned for later in 2019.

ARC will submit a Draft Remedial Investigation (RI) Report for the evaporation ponds (OU-4a).

ARC will perform the 2019 second quarter groundwater and domestic well monitoring sampling event.

The Community Involvement and Participation Plan (CIPP) for the ACMS was finalized in July 2018, and is nearing its first annual update. NDEP will start the updating process in March. Please find the current CIPP here. NDEP encourages readers of the CIPP to provide their feedback regarding the document to our site email, acms[at]ndep.nv.gov. Community feedback will allow NDEP to understand if there are any deficiencies in the document or areas in the document that can be amended to help the community understand the cleanup process and how to obtain information or provide input more clearly. Please see guidance on providing constructive feedback here. An updated version of the CIPP will be posted on the website in July 2019.

May:

The Atlantic Richfield Company (ARC) will be submitting the final CMUs 4 & 5 Fluid Management System (FMS) Ponds Remedial Design Report. ARC will also submit a Draft CMUs 4 & 5 FMS Ponds Remedial Action Monitoring Plan at that time.

June:

The Atlantic Richfield Company (ARC) will be submitting the OU-2, OU-4b, OU-5, and OU-6 Draft Human Health Risk Assessment (HHRA)/Screen Level Ecological Risk Assessment (SLERA) Work Plans. This planned document will be submitted as either one combined report or as separate work plans for each OU, or some combinations of OUs. 

What was accomplished in the previous three months:

March:

NDEP provided collated comments and direction to ARC on the CMU 4, 5, and 7 Fluid Management System (FMS) Ponds Draft Design Report. This Report details the engineering work required for OU-8 FMS pond construction, planned for later in 2019.

NDEP finished collating comments and providing direction to Atlantic Richfield Company (ARC) on how to finalize the OU-1 Geothermal Evaluation Tech Memo. The direction letter and collated comments were sent to ARC and stakeholders on April 1. This Tech Memo describes a line of evidence for potential sources of groundwater contamination in some areas of the groundwater plume north of the site. The Final Tech Memo will incorporate input from stakeholder, agency and other technical comments. The Final Tech Memo, along with the Final Plume Stability Tech Memo (submitted for stakeholder comment in May of 2018 and direction letter from NDEP sent to ARC in August of 2018), is expected to be submitted in the next few months.

February:

NDEP provided collated comments and direction to ARC on how to finalize the OU-4b, 5 &6, Field Sampling and Analysis Plan (FSAP).

January:

Stakeholder comments regarding Draft CMU 4, 5, and 7 Fluid Management System (FMS) Design Summary were received by NDEP.

NDEP provided direction to ARC related to a second request from ARC to eliminate specific radionuclides from sampling and analyses. The radionuclide reduction request is considered part of an overall groundwater and domestic well monitoring program optimization request to be submitted later in 2019.

NDEP presented planning aspects associated with site cleanup and groundwater decisions in 2019 to the Yerington City Council.

 

November:

Information from November’s Public Meeting will be left on the website until the next public meeting.

ARC submitted the OU-2 Field Sampling and Analysis Plan Final, based on comments from stakeholders, agency and other technical reviewers, and direction from NDEP. If you wish to read the document, please see the Anaconda- Site Documents page. 

In November, ARC met with various community groups in Yerington to discuss the future of the ACMS.

NDEP’s Most Recent Public Meeting

NDEP held a public meeting in support of the ACMS on Thursday, November 29, 2018. The meeting was from 4 to 6pm and was held in the Yerington High School gymnasium.

NDEP would like to thank everyone that attended and appreciates their input.

The format of the meeting was an informal Q&A session with three stations that allowed attendees to ask questions regarding the site. The three stations at the meeting focused on the following:

            Station 1- Community Involvement Plan, NDEP Anaconda Webpage, and Project Schedule

            Station 2- Phase 1 of the Project (capping and closure of the Arimetco heap leach pad system)

            Station 3- Groundwater plume stability study progress, bottled water service, and monitoring well sampling optimization

For those that attended and those that could not attend, please find copies of the posters NDEP had on display at the meeting below. All posters are downloadable.

Posters:

Station 1:
Please follow the provided hyperlink to the CIPP.

ACMS Operable Unit Map

ACMS Schedule 

Chart depicting the Anaconda 12-Year Closure Schedule
Click on schedule to enlarge

Station 2:
Phase 1 construction for ROD 1

Remedy Area

Conceptual drawings of how the closed heap leach pads will look

Conceptual Heap Leach Pad

Phase 1 Schedule

Phase 1 Schedule Poster

Station 3:
Map of Closure Phases

Map of Closure Phases

Groundwater Poster

Groundwater Map

Closure Schedule

Closure Schedule

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