1

Rodriguez, Dante

From: Zimmerman, Chuck <CZimmerman@brwncald.com>Sent: Friday, August 07, 2015 2:30 PMTo: 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); James.Lucari@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'; 'mmcfalls@wrpt.us'; 'ROB LOVEBERG'; Adam.Cohen@dgslaw.com; drdavis@blm.gov; 'Sunny091929@aol.com' (Sunny091929@aol.com)

Subject: July 2015 Monthly Report for the Yerington Mine SiteAttachments: July 2015 Monthly Report.pdf; Arimetco FMS July 2015 Monitoring Data.pdf

Categories: A08 - Arimetco

Dave: The July 2015 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 Howard, Ginny Hatch, Dietrick McGinnis, Chairwoman McFalls, 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 July 2015 monthly report. Regards, Chuck Zimmerman Vice President Brown and Caldwell CZimmerman@brwncald.com T 775.283.0810 | C 775.233.5575

SEMS-RM DOCID # 1162038

Atlantic Richfield Company

JackOman Project Manager

August 7, 2016

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) 87CMi195 faK jack.omanfllbp.com

SubJect: Jui, 2011 llanthly Report, Yemgton IIIM Site, L,an County, Nnada:

Dear Mr. Seta:

Admlnlllnllva ONIW for Rlmldlll IRwNllg111on and FNllbllty ltudr (RUFI}, CERCLA DHlmt No. N007.oooti; Alhlnleballwa Order on Cownt, CERCLA Docket No. ONOON010

Puniuant ID the above l'llfarwnClld anlars inuad by Iha U.S. Environmanlal PlolactioXI Agency - Region 9 (EPA), Atlantlc Rlchfteld Campa,y (ARC) 1111a prepared thla J&jy 2015 mon111Jy raport far RUFS and Ol)ef8.tiC1111 and Maintenance (O&M) ICtiYiliea It the Yerington Mine Sile (Site).

July 2015 ActlvlllN

sn18r:!1ritvand OINAdidn • Continued Sita O&M, aacullty and btll dlllllrrent actlvtllaa. CalTIMM at various Jocallonll (e.g.,

Mein and Arlmetco aates, entrance1 to bulclln;a) lndlca1ed no actMty tlf concern. • \l'md dancani, bird dallllmmt flags, Welland8 Wailanl and Bird Gard towers continued to be

daployed In accon!anca wtlh current EPA-epproved bird detamint mellloda. Ballaona remained in place over FMS Evaporation Ponds Band C. To reduce bids from becoming habitullted to the p.-nca of Mid dancel'B and flags, !MN davlcaa - ra-locat8d aa neadad. Md Gard lowel'B 'A', 'B' and 'C' wete in opeta.tion during the entire month of July due to precipi1ation events (approxlmataly O.fit lnchea of rain waa ramrdad at on-Sita rain gagaa In July).

• Raftec11ve Mylar bird de1Brrent dev!cee - daplclyed at Ille Slot pond, VL T pend and on three bird mitigation flag& Continued tha EPA-approved bird mitigalion BChedula, with at IMllt lhiw monllDrlng 1111111 per day at all ponds plus a fllurth monllllllng visit at Illa Aml8lco Ft.IS panda. Obsefvations "Mte made within half an hoW of dawn and di.Ilk and duri~ mid-day.

• PWS Pond water lavals: North c• = 0.0 feat; Midc!la Cell= 0.0 feat; South Call= 0.1 faat. • Arlmetco FMS pond Jevell: Phale 1 Pond • 4.62 feet; FMS EvaporaUon Pend A• 9.17 feet FMS

Evaporation Pond B = 5.98 feel; FMS Evaporation Pond C = 3.91 feet; VI. T Pond = 6A5 fed; Slot Pond = 18A7 faat. Tha fnleboard laval In FMS EVllpCllllllon Pond A on July 81 waa appl'O)(lmatlly D.98 feet. Fluid tranlferl In July wen, performed In aupport of Ille llydraulc (ta) taaling plan for FMS Evapol1llion Ponds B and C, which lllsrtad on July 14. Through Iha end of Illa month, apprc.xl'llllleli, 1,241,303 gallo111 we,., tranat'erred to Pond B from Pond C and the VI. T Pond. Approxinmt.ly 8,440 gallona of IGlltian warw lranafalnld fiom the -Uy modifilld Phua 1 Pond llo FMS Evaporalkln Pond C In July. See allached monltDrlng data.

bp

A BP affiliated company ©

Mr. Dave Seter Yerington Monthly Report August 7, 2015 Page 2 of 4

July 2015 Activities - Continued

Site Security and O&M Activities - Continued • Approximately 40,863 gallons of solution were pumped from the leak detectors in July including

10,061 gallons from the VLT Heap Leach Pad (HLP) and 4,553 gallons from the VLT Sediment Pond, and 23,793 gallons from the Slot (HLP) perimeter collection ditch. Approximately 212,507 gallons of solution have been pumped from the leak detectors since January 1, 2015. See attached monitoring data.

• Implemented the hydraulic (fill) testing plan on July 14 for FMS Evaporation Ponds B and C. Because the Godwin pump that was used to pump fluids from the VL T Pond lost suction with decreasing pond levels during the test, pumping of fluids from the C Pond was initiated.

• Re-calibrated pond level pressure transducers and implemented a more frequent cleaning and calibration check during the fill testing.

Site Characterization Activities • Site-wide monthly groundwater elevation measurements for July were obtained July 22-23 for

new wells and wells outfitted with pressure transducers. • A Pit Lake water elevation of 4,234.0 feet amsl was recorded on July 22, 2015 from the pressure

transducer, an increase of less than 0.1 feet since June 22, 2015. The pit lake elevation has risen 2.0 feet since July 22, 2014.

• No changes to the Bottled Water Program. • No changes to the Domestic Well Monitoring Program. • Transmitted the 1 Q 2015 Domestic Well Monitoring Report to EPA on July 24. • Continued the compilation of data for inclusion in the 1 Q 2015 Groundwater Monitoring Report

(GMR) and the 20 2015 Domestic Well Monitoring Report (DWMR). • Transmitted the Background Groundwater Water Quality Assessment (BGQA - Revision 2) to

EPA on July 2. • Continued preparation of the revised Geochemical Characterization DSR and geochemical

modeling of groundwater quality data. • Drilling and zonal sampling continued at B/W-63. Seven zonal samples were collected during

July. ARC received EPA input and approval to install six (S, I, D1, D2, D3, and D5) permanent monitor wells at the B/W-63 cluster. B/W-63D5 was installed and drilling started on B/W-63D3.

• Improved well head and surrounding ground surface repairs around MW-5S and B/W-65. • Transmitted OU-4a geotechnical and groundwater data to EPA and other project stakeholders on

July 20. Geotechnical and groundwater locations that were drilled and/or sampled were surveyed by Tri-State Surveying on July 21- 23.

• Transmitted DQOs and the CSM for the Wabuska Drain (OU-7) RI to EPA on July 14. Participated in a conference call with EPA and other project stakeholders to discuss the DQOs and the CSM for OU-7 on July 26.

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

Planned August/September 2015 Activities

Site Security and O&M Activities • Continue routine Site O&M, security and bird deterrent activities. • As needed, meet with EPA and NDEP to discuss any outstanding Arimetco FMS issues. • Continue hydraulic (fill) testing of FMS Evaporation Ponds B and C.

Site Characterization Activities • Continue groundwater elevation and pit lake level measurements, and meteorological monitoring. • Continue the Bottled Water Program. • Continue to compile groundwater and domestic well monitoring data for inclusion in the 20 2015

GMR and DWMR. Once completed, transmit the 1 Q 2015 GMR.

Mr. Dave Seter Yerington Monthly Report August 7, 2015 Page3af4

Planned August/September 2015 Activities • Continued

Site Characterization Activities • Continued • Conduct the 3Q 2015 groundwater monitoring event August ~21. • Conduct the 3Q 2015 domestic well event September 14-17. • Transmit the 1Q 2015 GMR to EPA. • Continue discussions with EPA regarding the proposed parameter reduction list for routine

quarterly groundwater sampling, and initiate discussions to reduce the scope af quarterly monitoring report contents for the domestic well and groundwater monitoring programs.

• Continue drilling, zonal sampling and monitor well installation activities at the BIW-63 well cluster. • Continue discussions with EPA regarding the OU-1 and OU-3 Human Health Risk Assessments. • Continue working on responses to comments from EPA dated March 18 on the Process Areas

(OU-3) Step-Out Characterization DSR, and the development af a Process Areas RI Report starting with a scoping discussion with EPA

• Prepare and transmtt a phased Fleld Sampling and Analysis Plan based on the DQOs and CSM for the Wabuska Drain (OU-7).

• Initiate \VOik on the OU-1 RI Report, and continue discussions with EPA and NDEP regarding the development of remedial action objectives (RAOs) and potential remedial attematives forOU-1.

• Initiate the development of a Bedrock Groundwater Assessment Technlcal Memorandum. • Prepare for and attend OU-1 and OU-4 technical meetings on August 5 and 6, respectively. • Prepare for and attend a Yerington Community Meeting on August 6.

Please contact me at (657) 529-4581 or via e-mail at jack.oman@bp.com if you have any questions or comments about the July 2015 monthly report

Sincerely,

J.<&_ Jack Oman Project Manager

Attachment

cc: Hany Ball, EPA - via electronic mail Dante Rodriguez, EPA- via electronic mail Andrew Helmllnger, EPA-via eleci'onlc mall Tom Dunkelman, EPA- via electronic mail Jeff Collins, NDEP - via electronic mail Jeryl Gardner, NDEP - via electronic mail Dave Davis, BLM -via electronic mail Dan Newell, City of Yerington - via electronic mail Phyllis Hunewill - via electn>nic mail Jim Sanford, MVEC - via electronic mail Tom Grady, Nevada State Assembly-via electronic mail Chairwoman Howard, YPT -via electronlc mall Ginny Hatch, YPT - via electronlc mall Deborah Dunn, YPT -via electronic mail Dietrick McGinnis, McGinnis and Associates - via elaci'onic mail Tom Bowden, Ridolfi, Inc. - via electronic mail Chairwoman McFalls, WRPT -via electronic mail Cynthia Oceguera, WRPT -via electronic mail Ron Halsey, Atlantic Richfield Company- via electronic mail

Mr. Dave Seter Yerington Monthly Report August 7, 2015 Page 4 of 4

James Lucari, 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 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 Steve Dischler, 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

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10000

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6000

4000

2000

0

Arimetco VLT Pond Flow (July 2015)

VL T Pond inflow = 125,839 gallons or 2.82 gallons per minute average

ll'l ~ ........ =-, ~ I,=

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- Precipitation *

* Average of north and south on-site rain gauges

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Arimetco FMS Evaporation Pond Band C Flow (July 2015) 30000 1.00

28000 Evaporation Pond B Flow = 0 gallons

- Evaporation Pond C Flow = 138,213 gallons or 3.10 gpm - Evaporation Pond C Flow 0.90 26000 - Precipitation * t-

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2015 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 w w w VLTSP 21 ,943

3,922.0 126.5 702.9 2,770.0 98.9 549.6 1,606.0 53.5 297.4 3,164.0 102.1 585.9 3,019.0 100.6 559.1 2,909 97.0 538.7 4,553 146.9 815.9

VLTP1 D 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 0.0 0.0 0.0

w w w w w w w VLTD1 54,328

12,920.0 416.8 5,730.0 204.6 4,101 .0 136.7 3,044.0 98.2 6,951 .0 231 .7 9,784 326.1 11 ,798 380.6

w w w w w w w VLTD2 5,941

1,124.0 36.3 1,076.0 38.4 1,11 7.0 37.2 896.0 28.9 789.0 26.3 277 9.2 662 21.4

VLTD3 D 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

Tot VLTD1 + D2 + D3 14,044.0 453.0 8.1 6,806.0 243.1 4.3 5,218.0 173.9 3.0 3,940.0 127.1 2.3 7,740.0 258.0 4.5 10,061 .0 335.4 6.0 12,460.0 401 .9 7.2

D w w w w w w EP"B" 1,282

0.0 0.0 0.0 1,200.0 42.9 39.0 42.0 1.4 1.3 0.0 0.0 0.0 0.0 0.0 0.0 40.0 0.0 0.0 0.0

EP"C" D 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 0.0 0.0 0.0

IFX w w w w w w w

499 91 .0 2.9 61 .0 2.2 43.0 1.4 39.0 1.3 194.0 6.5 30 1.0 41 1.3

II FX w w w w w w w

141 38.0 1.2 32.0 1.1 14.0 0.5 23.0 0.7 18.0 0.6 0.0 0.0 16 0.5

Ill FX D 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

Tot 1FX+ 2FX + 3FX 129.0 4.2 0.1 93.0 3.3 0.1 57.0 1.9 0.0 62.0 2.0 0.0 212.0 7.1 0.1 30.0 1.0 0.02 57.0 1.8 0.04

SSP1 D 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 0 0.0 0.0

w w w w w w w SD1 128,345

8,988.0 289.9 7,138.0 254.9 17,757.0 591 .9 22,380.0 721.9 24,905.0 830.2 23,384 779.5 23,793 767.5

SD2 D 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

SD3 D 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

Tot SD1 + SD2 + SD3 8,988.0 289.9 4.4 7,138.0 254.9 3.9 17,757.0 591 .9 8.7 22,380.0 721 .9 11 .3 24,905.0 830.2 12.2 23,384.0 779.5 11 .8 23,793.0 767.5 11 .6

MD1 w w w w w D

28 21 .0 0.7 0.01 7.0 0.3 0.01 0.0 0.0 0.00 0.0 0.0 0.00 0.0 0.0 0.00 0.0 0.0 0.00

Total 27,104 18,014 24,680 29,546 35,876 36,424 40,863 0 0 0 0 0 212,507

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

10) 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 01 +02+03, Tot 1 FX+2FX+3FX, and Tot SD1 +SD2+SD3) for estimating flows in Gallons per Acre per Day (G/Ac-D)