1

Rodriguez, Dante

From: Chuck Zimmerman <CZimmerman@brwncald.com>Sent: Wednesday, July 06, 2016 10:38 AMTo: Seter, DavidCc: 'Oman, Jack'; Ball, Harold; Rodriguez, Dante; jrcollins@ndep.nv.gov; Jeryl Gardner;

'Phyllis P. Hunewill'; 'tgrady@asm.state.nv.us'; manager@yerington.net; cynthiaoceguera8@gmail.com; 'Halsey, Ronald H'; Dunkelman, Tom; 'Brian.S.Johnson@bp.com'; Gallery, Patricia A (patricia.gallery@bp.com); 'Block, Nathan' (Nathan.Block@bp.com); Helmlinger, Andrew; 'Tom Bowden'; 'Taurus Massey'; 'sdischler@quaterra.com'; 'John Batchelder'; 'chairman@ypt-nsn.gov'; environmentaldirector@ypt-nsn.gov; ghatch@ypt-nsn.gov; 'preacherpauly@earthlink.net'; dmcginnis@sbcglobal.net; 'david@periandsons.com'; Isham, Julian; McMillan, John (CFS); 'Ken.Greene@CH2M.com'; 'Victor.Early@ttemi.com'; 'Colin.Lee@tetratech.com'; 'Chatham, James R'; 'Duffy, William'; 'tpatton@quaterra.com'; 'ROB LOVEBERG'; Adam.Cohen@dgslaw.com; drdavis@blm.gov; 'Sunny091929@aol.com' (Sunny091929@aol.com); Dan Ferriter (dan.ferriter@copperenv.com) (dan.ferriter@copperenv.com); mike.mahon@copperenv.com; Travis.Phelps@arcadis.com; Randy Miller (rlmiller@broadbentinc.com)

Subject: June 2016 Monthly Report for the Yerington Mine SiteAttachments: June 2016 Monthly Report.pdf; Arimetco FMS June 2016 Monitoring Data.pdf

Categories: A08 - FMS, A00 - Sitewide, A08 - Arimetco

Dave: The June 2016 monthly report for the Yerington Mine Site is attached, along with the monthly Arimetco Fluid Management System (FMS) monitoring data. The original will be sent to you today by certified mail. Hard copies will be sent via regular mail to the Lyon County Library, Chairwoman Thom, Ginny Hatch, Dietrick McGinnis, Cynthia Oceguera and Peggy Pauly. This e-mail serves as the submittal for the remainder of the copied recipients. Please forward this e-mail to others who may be interested in the June 2016 monthly report. Regards, Chuck Zimmerman Vice President Brown and Caldwell CZimmerman@brwncald.com T 775.283.0810 | C 775.233.5575

SEMS-RM DOCID # 1162032

Atlantic Richfield Company

JackOman Project Manager

Julye, 201e

CERTFED- RETURN RECEPT REQUES'IE)

Mr. Daw Saler Remedial f'nllect Malagar U.S. Environmenlll Pm•~~ - Region 9 76 Hawthoma Slnlat, SFD-9-1 san Francllco, CA 94105

4 Cenlllrpoinlll Drive LaPalma, CA. 90823-1066 (8117) S2MS81 office (714) 870-6195 faK jack.omanfllbp.com

SubJect: Juna 2011 llonthly R1port, Yellngtan Mini Sita, Lyon County, Nnada:

Dear Mr. Seta:

Admlnlllilllld ONIW for Rlmldlll IRwNll9111ort and FNllbllty ltudr (RUFI}, CERCLA DHlmt No. N007.oooti; Alhlnlaballwa Ordlr on Cownt, CERCLA Docket No. ONOON010

Puniuant ID the above rafarwnClld anlars inulld by Iha U.S. Environmanlal Plol&ctioXI Agency - Region 9 (EPA), Allanllc RJc:hfleld Campa,y (ARC) has prepared 1111a June 2018 monlhly rapart for RIIFS and Ol)ef8.tiC1111 and Maintenance (O&M) ICtiYiliea It the Yerington Mine Sile (Site).

June 21111 ActMtlla

Stto SecurttY and PIM &#,!lo, • Cantinuad Silll O&M, uc:urily and bn dal9nant aclMtin. The two acurily c:amann indic«tad no

ac:1lvlty of c:oncam. • Whl dance11, bird de1em,nt !lags, Welland Walin and !IN Gard ~ conlfnued ID be

daployad in acx:ordance 'lri1h c:unant EPA-approved bird durrant p,uto ill To reduce bns flam becoming habituated to Ille pnlNIIC8 or wind cllRena and ftaga, 111eaa dev!cea W8l8 lelocated u needed (wind dllncen on the Evapotation Pondl were lhut down during the llilling program).

• Bird Gird towers 'A', 'B' and ·r: were In o,ere.llon up lllrouah June 20 wllen they were lhut down dua ID dry mnditiana within the ponda.

• Continued Ille EPA-appnwed bird detllmlnt aclledule with al Jeaat two monltollng vlalla per day at al ponds. OblerYatlona were made within hair an ho .. CII dawn and dulk.

• PWS Pond water lavela: North c• = 0.0 feet; Middle Cell= 0.0 faat; South Call= 0.0 faat. • M of June 30, Iha Arlmetco FMS pond levels were: Phaae 1 Pond = 3.88 feet; FMS Evlporallol'I

Pond A = 8.82 feel; FM8 Evaporation Pond B = 5.88 feel; FMS Evaporation Pond C = 5.84 fed; '\/LT Pond• 11A7 feet; Skit Pond• 18.86 faet 111e freebase! lewll In FMS Evapora11on Pond A on June 30 was 1pproxifte.tely 1.53 feet. Fluid trlnlfetl in June consisted of 1pprc.xi111te1y 10,976 gallons from Iha Phll&a 1 Pond lo Pond B and 112,468 galons from Iha Slot Pond to Pond a. see 1lt1ched mon!IDllng dl1a.

• No lllinfall occ:urnid during June and Iha 1lllal Silll rainfall lW11Binad 3.1 iooh• 1ince January 1, 2018. Sea altached monltllllng dais.

• App,aximltely 27,858 gallon• of solution were pum,,ed from the leek detectors in June including 2,431 gallona from Iha '\IL T dilch• and Sediment Pond, and 28,418 gallon& from Iha stat HLP perlmeler collectlon ditch. see 1ttaet,ect monltomg data.

bp

A BP affiliated company ©

Mr. Dave Seter Yerington Monthly Report July 6, 2016 Page2

June 2016 Activities - Continued

Site Security and O&M Activities - Continued • FMS pond samples for total dissolved solids (TDS) analyses and electrical conductivity (EC)

measurements were obtained on June 21 from various depths and locations around the ponds. • On June 22-23, repairs (cutting the pipe and welding a butt flange) were made to five leaks in

older, thin-walled portions of the VL T pipeline within the pipeline ditch (i.e., the leaks remained in containment). The leaks appear to have developed in response to the spray evaporation testing conducted by SPS.

Site Characterization Activities • Site-wide monthly groundwater elevation measurements were obtained June 19-21 for recently

installed monitor wells and wells outfitted with pressure transducers. • A Pit Lake water elevation of 4,235.05 feet amsl was recorded on June 19 from the pressure

transducer, an increase of 0.08 feet since May 19, 2016. The pit lake elevation has risen 1.09 feet since June 19, 2015.

• No changes to the Domestic Well Monitoring Program in June 2016. The number of domestic wells included in the program has decreased as properties continue to be connected to the Yerington municipal water system and domestic wells are taken out of service. Specific changes to the program are anticipated to be documented in the Second Quarter 2016 Domestic Well Monitoring Report (DWMR).

• No changes to the Bottled Water Program in June 2016. The number of properties requiring bottled water will decrease as properties continue to be connected to the Yerington municipal water system, and domestic wells are taken out of service.

• Continued the compilation of data for inclusion in the 1Q 2016 Groundwater Monitoring Report (GMR) and the 1Q 2016 DWMR.

• Continued the preparation of a technical memorandum describing proposed modifications to the Site-wide groundwater monitoring program.

• Continued development of the OU-3 Human Health Risk Assessment (HHRA) Technical Memorandum (Tech Memo 2), which includes the calculation of exposure point concentrations for oxide tailings, soil, and soil vapors for future workers.

• Continued to develop the OU-3 HHRA Work Plan and OU-3 soil and oxide tailings data quality review for risk assessment, and the calculation of soil vapor screening levels.

• Prepared for and participated in a groundwater technical meeting held on June 29 with EPA and other stakeholders to discuss comments on the revised Background Groundwater Quality Assessment (BGQA), the Bedrock Characterization Technical Memorandum, and the Geochemical DSR as well as the path forward for completion of the Site-Wide Groundwater Operable Unit (OU-1) Remedial Investigation Report. Provided EPA and others with responses to comments on the revised BGQA dated July 2, 2015.

• EPA confirmed on June 2 that the Bedrock Groundwater Assessment Technical Memorandum had been reviewed, and that no revisions to the Technical Memorandum would be required for its inclusion in the OU-1 RI Report.

• Continued to compile information for inclusion in the OU-1 RI Report. • Continued to compile soil classification and XRF data collected during OU-7 Phase 1 field

sampling activities, and continued to compile the analytical data received from the project laboratory (all laboratory data have been received with the exception of the radiochemical analyses and data validation is expected to be completed by late July).

• Drilling activities on the Evaporation Ponds started on June 7. Borings for the vadose zone characterization locations (EP-VZC-2, -3, -6 and -8) were drilled, and the soil logged and collected for transmittal to: 1) Test America for geochemical analyses; 2) Sierra Environmental Monitoring (SEM) for Meteoric Water Mobility Procedure (MWMP), electrical conductivity, moisture content, and soil pH analyses; and 3) Geo-Logic for grain size determinations and hydraulic property testing as described in the OU-4a Field Sampling and Analysis Plan (FSAP).

Mr. Dave Seter Yerington Monthly Report July 6, 2016 Page 3

June 2016 Activities - Continued

Site Characterization Activities - Continued • Drilling in the Evaporation Ponds was then initiated on June 21 for soil and groundwater sample

collection and geochemical analyses at the following locations (temporary well locations sampled to date are in bold font) : EP-GC-4, EP-GC-5, EP-GC-6, EP-GC-7, EP-GC-8, EP-GC-9, EP-GC-10, EP-GC-11, EP-GC-12, EP-GC-14, EP-GC-15, EP-GC-16, EP-GC-23, EP-GC-24, EP-GC-25 and EP-GC-26.

• Routine database management activities in support of Site investigations and monitoring activities.

• Submitted a Notice of Contractor Change to EPA on June 22, 2016.

Planned July/August 2016 Activities

Site Security and O&M Activities • Continue routine Site O&M, security and bird deterrent activities. • Continue FMS pond sampling for TDS analyses and EC measurements.

Site Characterization Activities • Continue groundwater elevation and pit lake level measurements, and meteorological monitoring. • Prepare for and perform the 30 2016 groundwater monitoring event (August). • Prepare for the 30 2016 domestic well monitoring event, with possible modifications as indicated

above. • Continue the Bottled Water Program, with possible modifications as indicated above. • Continue the compilation of data for inclusion in the 10 2016 GMR and 10 2016 DWMR. • Complete and transmit the technical memorandum describing proposed modifications to the Site­

wide groundwater monitoring program. Continue discussions with EPA regarding the proposed reductions to the groundwater and domestic well monitoring programs including analytical parameters, wells to be sampled and the quarterly/annual report contents.

• Prepare for and participate in a technical meeting to be held on August 2 to discuss the screening of remedial action alternatives and other FS-related subjects with EPA and other stakeholders.

• Continue to compile information for inclusion in the OU-1 RI Report, including an analysis of chemical concentration stability in Site-wide groundwater monitor wells.

• Continue to compile OU-7 field and laboratory analytical data into tables and maps for use in a future technical meeting with EPA and other stakeholders.

• Continue and complete drilling and sampling of soils and groundwater in the Evaporation Ponds, and the installation of vadose zone monitoring equipment installation at four locations (EP-VZC-2, -3, -6 and -8). Initiate development of the OU-4a Data Summary Report.

• Continue working on responses to comments from EPA dated March 16, 2015 on the Process Areas (OU-3) Step-Out Characterization DSR, and the development of a Process Areas RI Report.

• Complete and transmit OU-3 HHRA Tech Memo 2 and discuss with EPA the technical topics outlined in Tech Memo 2 for ultimate inclusion in the HHRA Work Plan. Continue to develop the OU-3 HHRA Work Plan.

• Complete and transmit the draft OU-1 human health conceptual site model.

Mr. Dave Seter Yerington Monthly Report July 6, 2016 Page4

Please contact me at (857) 529-4581 or via e-mail at jack.oman@bp.com if you have any questions or comments about this June 2016 monthly report.

Sincerely,

J.<&_ Jack Oman Project Manager

.Attachment

cc: Hany Ball, EPA - via electronic mail Dante Rodriguez, EPA - via electronic mail Andrew Helmlinger, EPA - via electronic mail Tom Dunkelman, EPA-via electronic mail Jeff Collins, NDEP - via electronic mail Jeryl Gardner, N DEP - via electronic mail Dave Davis, BLM -via electronic mail Dan Newell, City of Yerington -via electronic mail Phyllis Hunewill - via electronic mail Jim Sanford, MVEC - via electronic mail Tom Grady, Nevada State Assembly-via electronic mail Chairwoman Thom, YPT -via electronic mail Ginny Hatch, YPT -via electronic mail Deborah Dunn, YPT - via electronic mail Dietrick McGinnis, McGinnis and Associates - via elecb'onic mail Tom Bowden, Ridolfi, Inc. -via electronic mail Chainnan Sanchez, WRPT -via elecb'onic mail Cynthia Oceguera, WRPT - via electronic mail Ron Halsey, Atlantic Richfield Company- via electronic mail Nathan Block, Atlantic Richfield Company - via electronic mail Patricia Gallery, Atlantic Richfield Company- via electronic mail Brian Johnson, Atlantic Richfield Company- via electronic mail John Batchelder, EnviroSolve - via electronic mail Dan Ferriter, Copper Environmental - via electronic mail Mika Mahon, Copper Environmental - via electronic mail Randy Miller, Broadbent - via electronic mail Travis Phelps, .Arcadis - via electronic mail Jim Chatham, Atlantic Richfield Company - via elecbonic mail Adam Cohen, Davis Graham & stubbs-via elecbonic mail Bill Duffy, Davis Graham & stubbs -via electronic mail Tom Patton, Singatse Peak Services, LLP - via electronic mail Taurus Massey, Singatse Peak Services, LLP -via electronic mail David Peri, Peri and Sons - via electronic mail John McMillan, CBI - via electronic mail Julian Isham, CBI - via electronic mail Victor Earty, Ten Tech-via electronic mail Colin Lee, Tetra Tech-via electronic mail Ken Greene, CH2M Hill - via electronic mail Peggy Pauly, YCAG - via electronic mail Lyon County Library System Central

Arimetco VLT Pond Flow (June 2016)

50000 2.0 I VL T Heap Leach Pad = 126,026 gallons or 2.92 gpm I VL T Pond Weir Flow 1.9

45000 - Precipitation * 1.8

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on-site rain gauges - 1.6

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-~ "Cl 30000 ... ~ Q., ~ = = 25000 --= 1:1!) -~ = 20000 -~

Preci(!itation Precipitation June 2016 = 0 inches

,- Total Precipitation 2016 = 3.10 inches

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- Slot Pond Transfer = 112,456 gallons Phase III HLP Flow= 96,276 gallons or 2.23 gpm

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2016 Monthly Leak Detector Data

Leak Detector ID1 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year To Date

Total (Gallons)

Units G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D G/M G/D G/Ac-D

w w w w D w VLTSP 1,995

1,094.0 35.3 196.1 883.0 31.5 175.2 9.0 0.3 1.7 0.0 0.0 0.0 0.0 0.0 0.0 9 0.3 1.7

VLTP1 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

w w w w w w VLTD1 9,701

4,21 7.0 136.0 1,018.0 36.4 733.0 24.4 453.0 15.1 1,220.0 39.4 2,060 68.7

w w w w w w VLTD2 2,934

501.0 16.2 470.0 16.8 788.0 26.3 367.0 12.2 437.0 14.1 371 12.4

VLTD3 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Tot VLTD1 + D2+ D3 4,718.0 152.2 2.7 1,488.0 53.1 0.9 1,521 .0 50.7 0.9 820.0 27.3 0.5 1,657.0 53.5 1.0 2,431 .0 81 .0 1.4

EP"B" D w w w w w

96 25.0 0.8 0.7 51 .0 1.8 1.7 20.0 0.7 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

EP"C" D w w w w D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

IFX w w w w w w

468 111 .0 3.6 118.0 4.2 116.0 3.9 60.0 2.0 63.0 2.0 0 0.0

II FX w w w w w w

160 55.0 1.8 44.0 1.6 33.0 1.1 15.0 0.5 13.0 0.4 0.0 0.0

Ill FX D D w w D D

35 0.0 0.0 0.0 0.0 35.0 1.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Tot 1FX+ 2FX + 3FX 166.0 5.4 0.1 162.0 5.8 0.1 184.0 6.1 0.1 75.0 2.5 0.1 76.0 2.5 0.1 0.0 0.0 0.00

SSP1 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

w w w w w w SD1 131,426

17,829.0 575.1 21 ,786.0 778.1 23,652.0 788.4 20,568.0 685.6 22,173.0 715.3 25,418 847.3

SD2 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

SD3 D D D D D D

0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0

Tot SD1 + SD2 + SD3 17,829.0 575.1 8.7 21 ,786.0 778.1 11 .8 23,652.0 788.4 11 .6 20,568.0 685.6 10.4 22,173.0 715.3 10.8 25,418.0 847.3 12.8

MD1 w w w w w w

7 0.0 0.0 0.00 0.0 0.0 0.00 7.0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.0 0.0 0.0

Total 23,832 24,370 25,393 21 ,463 23,906 27,858 146,822

Notes: 1) Leak Detector Locations shown on Figure 2- 1 of the 2015 Annual O&M Report (March 31 , 2015)

2) W = Wet; and D = Dry ("Wet" and "Dry" visual observations)

3) G/M = Gallons per Month

4) G/D = Gallons Per Day

5) G/Ac-D = Gallons per Acre per Day (monthly average)

6) VL T Sediment Pond Area = 0.18 acres

7) VL T Pond Area = 1.25 acres

8) Slot Sediment Pond Area = 0.18 acres

9) Slot Pond 2 Area = 1.1 acres

1 O) Evaporation Pond B Area = 1.1 acres

11) Evaporation Pond C Area = 1.1 acres

12) Slot Heap Leach Pad (HLP) Area= 66 acres

13) VLT HLP Area= 56 acres

14) Phase Ill 4X HLP A rea= 47 acres

15) Phase Ill South HLP Area= 48 acres

16) Individual HLP perimeter collection ditch leak detector flows combined (Tot VL T D1 +D2+D3, Tot 1 FX+2FX+3FX, and Tot SD1 +SD2+SD3) for estimating flows in Gallons per Acre per Day (G/Ac-D)