1

Rodriguez, Dante

From: Chuck Zimmerman <CZimmerman@brwncald.com>Sent: Monday, June 06, 2016 10:06 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

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

Categories: A08 - Arimetco

Dave: The May 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 May 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 # 1162031

Atlantic Richfield Company

JackOman Project Manager

June 6, 2018

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: lllay 2018 Monthly R1pc11t, YMlngmn Mina Sita, L,on County, Nnada:

Dear Mr. Seta:

Admlnlllilllld ONIW for Rlmldlll IRwNllg111on and FNllbllty ltudr (RUFI}, CERCLA DHlmt No. N007.oooti; Alhlnlaballwa Ordar on Cownt, CERCLA Docket No. ONOON010

Puniuant ID the above rafarwnClld anlars inuad by Iha U.S. Environmanlal PlolactioXI Agency - Region 9 (EPA), Allantlc Rlcllllald Company (ARC) haa prapared 11118 May 2016 monlhly report for RIIFS and Ol)ef8.tiC1111 and Maintenance (O&M) ICtiYiliea It the Yerington Mine Sile (Site).

lllaJ Zl111 AdMIIN

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

ac:1lvlty of c:oncam. • Whl danceis, bN deterrent !legs, Wetlandl Wallel'I and Bird Gard towe111 conl!nued to be

daployad in~ IIW1h currant EPA-approved bird dat.rr.it mathoda. To reduce birds from bacamlng habituated 1D Ille presence otwfnd dancera and flap, th- devlc8a ware lllb:8t8d u needed. BiRI Gard towe11 'A', 'B' and 'C' wete in opntion throughout May.

• Cantlnuacl Iha EPA-eppn,vad bird datemint achaclula Mth at laaat thraa monlto!lng vlaltB p.- day at al ponds. ObeelVatlons wen, made Wttllln hair an hour or daWn and dusk and during mid-day.

• PWS Pond nt.r laval9: Nlll1h c• = 0.0 r..t; Midclla Cell= 0.0 r..t; South Cell= 0.0 fall • Mot May 31, Illa Allmell:o FUS pond Jevelll-.: Phaae 1 Pond • 4.10 feet; FMS Evapondlan

Pond A.= 8.87 reet; FMS E!Ylpora11on Pond B = 5.74 feet; FMS EvapOllll!on Pond C = 6.39 l'eel; 'v1. T Pond = 12.81 faal; Slat Pond = 17.89 faat. Tha freaboard lallel in FMS Evaporation Pond A on May 31 wu appn,xlmalely 1.18 feet. Fluid tranll'ft lrl May conlllted or approxlmalet.f 13,200 gallons from tha Phua 1 Pond ID Pond C. Saa allachad monitoring dala

• About 1.02 lnchaa of rain fell on tha Sita In May {approxlrna1111y a 1 lnc:NB alnca January 1, 2018). see allactted moniloq dat&

• Appruximately 28,908 gallor8 of aolution - pumpacl fnlm tha laak datactors in May including 1,657 gallons Imm the 'v1. T dltc111111 and Sediment Pond, and 22,173 gallons from Illa Slot HLP parimalar c:ollllc:tion ditch. S.. allac:had monitoq data.

• Ft.IS pond aamplBI for total dlaaclved aollds {TDS) a.Jy.s and eladlk:al c:onductl'llly (EC) mee11.1rements were obtained on May 26 from varlou1 depths and locallona around tha pond1.

• Finalz.ad ..-.d fnlnlmittad tha 2015 Annual Arimatco FMS Operation and Maintananca Report dalad May 16, 2018.

A BP affiliated company d

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

May 2016 Activities - Continued

Site Characterization Activities • Site-wide monthly groundwater elevation measurements were obtained May 24-25 for all monitor

wells. • A Pit Lake water elevation of 4,235.05 feet amsl was recorded on May 26 from the pressure

transducer, an increase of 0.57 feet since April 26, 2016. The pit lake elevation has risen 1.41 feet since May 26, 2015.

• A signed access agreement from the owner of DW-214 was received and the residence was added to the Domestic Well Program in May 2016 (new owners requested to be included in the Domestic Well Program because neighboring residences were included).

• There were no changes to the Bottled Water Program in May 2016. • Completed and transmitted the Annual 2015 Groundwater Monitoring Report (GMR) on May 27.

Initiated the compilation of data for inclusion in the 10 2016 GMR. • Initiated the compilation of data for inclusion in the 1 Q 2016 Domestic Well Monitoring Report

(DWMR). • Initiated the preparation of a technical memorandum describing proposed modifications to the

Site-wide groundwater monitoring program. • Continued responses to EPA comments dated April 11, 2016 on the OU-3 Human Health Risk

Assessment Technical Memorandum (Tech Memo). • Continued to develop the OU-3 Human Health Risk Assessment Tech Memo no. 2. • Continued the development of responses to EPA and stakeholder comments dated April 5, 2016

on the Draft Initial Screening of Remedial Alternatives Tech Memo dated December 2, 2015. • Continued developing responses to EPA comments dated February 11, 2016 on the Background

Groundwater Quality Assessment - Revision 2 (revised BGQA) dated July 2, 2015. • 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 started to compile the analytical data received from the project laboratory. • Re-sampled several OU-7 locations on May 4 due to laboratory mishandling of the previously

collected samples. • Continued planning for the implementation of the OU-4a field program including the construction

of two drill pads located within the evaporation ponds. • Routine database management activities in support of Site investigations and monitoring

activities.

Planned June/July 2016 Activities

Site Security and O&M Activities - Continued • 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. • Perform the 20 2016 domestic well monitoring event. The number of domestic wells requiring

monitoring will decrease as properties continue to be connected to the Yerington municipal system, and domestic wells are taken out of service.

• Continue the Bottled Water Program. ARC will be requesting approval from EPA to curtail the Bottled Water Program as properties that are currently receiving bottled water continue to be connected to the Yerington municipal system.

• Continue the compilation of data for inclusion in the 10 2016 GMR and 10 2016 DWMR.

Mr. Dave Seter Yerington Monthly Report June 6, 2016 Page3

Planned June/July 2018 Activities - Continued

site Characte[lzatloo AcllYltles - conunueg • Continue the preparation of a tech memo 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 quarterty/annual report contents.

• Continue the development of and transmit respon,es to EPA and stakeholder comments on the Draft Initial Screening of Remedial Alternatives Tech Memo. Participate in a conference call to be held on June 7 to di&cu&s this tech memo with EPA and other project stakeholders.

• Continue the development of and transmit responses to EPA comments on the revised BGQA. Attend a technical meeting on June 29 to discuss the revised BGQA

• Continue to compile information for inclusion in the OU-1 RI Report, induding 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 to prepare for, and initiate the OU-4a field activities on June 7. • Continue wortcing 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

• Discuss with EPA on a June 1, 2016 conference call responses to EPA comments on the OU-3 Human Health Risk Assessment Tech Memo no. 2, and transmit the Tech Memo.

• Continue to develop the OU-1 Human Health Conceptual Site Model Tech Memo.

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 May 2016 monthly report.

Sincerely,

J.<A_ Jack Oman Project Manager

Attachment

cc: Harry Ball, EPA - via electronic mail Dante Rodriguez, EPA- via electronic mail Andrew Helmlinger, EPA-via electronic mail Tom Dunkelman, EPA- via electronic mail Jeff Colllns, NDEP -via eleci'onlc mall Jeryl Gardner, NDEP - via eleci'onlc mall Dave Davis, BLM -via electronic mail Dan Newell, City of Yerington - via electronic mail Phyllis Hunewill - via electronic mail Jim Sanfan:t, MVEC - via electronic mail Tom Grady, Nevada State Assembly-via eleci'onic mail Chairwoman Thom, YPT -via electronic mail Ginny Hatch, YPT - via electronlc mall Deborah Dunn, YPT -via electronic mail Dietrick McGinnis, McGinnis and As9ociates - via eleci'onic mail Tom Bowden, Ridolfi, Inc. - via electmnic mail Chairman Sanchez, WRPT -via electronic mail

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

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 Mike Mahon, Copper Environmental - via electronic mail Jim Chatham, Atlantic Richfield Company - via electronic mail Adam Cohen, Davis Graham & Stubbs - via electronic 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 Early, Tetra 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 (May 2016)

50000 2.0 I VLT Heap Leach Pad= 157,768 gallons or 3.42 gpm I VL T Pond Weir Flow 1.9

45000 - Precipitation * 1.8

1.7

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on-site rain gauges - 1.6

1.5

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

Preci(!itation Precipitation May 2016 = 1.02 inches

,- Total Precipitation 2016 = 3.10 inches

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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 VLTSP 1,986

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

VLTP1 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

w w w w w VLTD1 7,641

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

w w w w w VLTD2 2,563

501.0 16.2 470.0 16.8 788.0 26.3 367.0 12.2 437.0 14.1

VLTD3 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

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

EP"B" D 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

EP"C" D w w w w

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

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

II FX 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

Ill FX D D w w D

35 0.0 0.0 0.0 0.0 35.0 1.2 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

SSP1 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

w w w w w SD1 106,008

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

SD2 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

SD3 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

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

MD1 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

Total 23,832 24,370 25,393 21 ,463 23,906 118,964

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 Area= 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)