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MW-184S12.2/1.9

MW-184S34.9/4.2

MW-186S15/4.3

MW-186S34.2/3.8

MW-193S30.31/ND

MW-194S1(4.9/4.7)

MW-196S1(3.6/4.1)

MW-196S23.1/2.5

MW-205S13.2/2.8

MW-205S33.8/3.3

MW-185S1(5/5.1)

MW-188S1(6.9/6.9)

MW-195S1(5/4.6)

MW-205S2(3.8/3.9)

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e ri canA

ve

PlymouthRd

Fri

ends

Rd

Am

eric

an A

ve

Sunset Rd

Northern Disputed Plume Area

Northern Disputed Plume Area

Orc

hard

Rd

Bn Ranch Rd

Har

pers

Way

Ha lsted Rd

Hin

kley

Rd

Grass Hopper

Fossil Bed Rd

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MW-103.

MW-111S1(2.2/2.3)

MW-113S2(2.9/2.7)

MW-1(1.2

MW-123S12/2

MW-124S1(2.7/2.7)

MW-1(2/2.2)

MW-125S1(2.2/2.4)

MW-126S1(2.5/2.5)MW-126S2

(1.5/1.6)

MW3/2.

MW1.4/1

MW-131S1(2.8/3.2)

MW-133S17.6/6.7

MW-135S22.9/3.4

MW-136S13.9/3.7

MW-136S2ND/ND

MW-137S14.7/5

MW-137S24.6/4.7

MW-137S33.2/3.3

MW-142S23/2.8

MW-154S18.2/7.7

MW-154S22/2.3

MW-161S23.3/2.8

MW-162S1(4/5)

MW-170S

MW-172S13/2.9

MW-173S14/3.8

MW-174S13.5/3.1

MW-175S1(3.1/3.3)

MW-193S14.5/4.1

MW-193S24/3.4

MW-200S11.1/1.2

MW-204S13.3/2.9

MW-204S23.5/3.4

MW-26.4/6

MW-23

MW-212S13.4/3.1

MW-212S23.1/2.9

MW-83D1.8/1.8MW-83S

1.8/2.3

MW-89S2.3/2.8

MW-1(0.65

MW-111S2(2.3/2.6)

MW-113S1(2.9/2.9)

MW-125S2(1.5/1.6)

MW-175S2(3/3.5)

MW-130S2(3.7/4.3)

MW-135S1(3.8/4)

MW-139S1(4/4)

MW-140(4.8/4.7

MW-140S3(3.5/3.3)

MW

MW-142S1(4/4.1)

MW-156S(0.73/1.3)

MW-157S(1.7/2.4)

MW-161S1(3.4/3.4)

MW-171S(2.3/2.8)

MW-172S2(0.73/1.2)

MW-174S2(2.3/2.7)

MW-89D0.77/ND

MW-1(0.89/

MW-171D1(ND/ND)

MW-175D(2.7/2.8)

22-212.0/1.8

22-65ND/ND 22-73

2.0/1.622-80ND/ND

22-810.64/ND

22-821.3/1.2

22-932.7/2.0

23-303.4/4.2

22-741.8/1.7

22-600.57/ND

The 3.1/3.2-μg/L contour is shown as "- -?- -" where inferred and cannot be fully delineated byThird Quarter 2017 monitoring data.

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Bla

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Rd

Burnt TreeR

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Pue

blo

Rd

Ser

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Pet

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Sonoma St

Sal inas Rd

Roy RdHolstead Rd

Fossil Bed RdA

merican

Way

Orc

hard

St

Mou

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Rd

Hin

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Rd

Ho lstead Rd

Manacor Rd

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EX-316.2/5.3

EX-320.38/ND

EX-333.9/3.4

EX-35(1.8/1.8)

G-2R(1.5/1.4)

04S15/3.3

MW-105S2.8/3.1

MW-106S3/2.8

17S22/1.3)

24S2)

W-127S1.9

-127S21.6

MW-128S16.2/5.5

MW-128S23.1/2.8

MW-128S31.7/1.7

MW-166S1(ND/ND)

MW-197S11.1/ND

MW-206S2.5/2.3

207S1

207S2.6/3.6

MW-55S

MW-68S1.9/2.5

MW-70S1.3/2

MW-71S0.95/1.3

MW-72S4.8/5.2

MW-79S6.2/6.6

MW-80S3.7/4

MW-84S1.7/1.6

MW-85S1.5/1.9

S8

MW-94D3.1/2.9

MW-97S7.3/8.7

MW-219S12.6/3.1

MW-219S20.92/1.1

17S15/ND)

MW-166S2(ND/ND)

MW-197S2(ND/ND)

MW-107S(2.6/2.8)

MW-138S1(5/5.1)

0S17)

W-141S2(4/3.9)

MW-69S(0.67/1.2)

MW-94S(6.3/6.3)

G-1R(1.3/1.2)

MW-104DND/ND

MW-105DND/ND

MW-106DND/ND

MW 55A

MW-68D2.9/3.1

MW-70D1.1/1.8

MW-71D0.27/ND

MW-79DND/ND

MW-84D0.3/ND

MW-85DND/ND

DD

124D/1.2)

MW-69D(1.7/2.4)

30E-011.7/1.4

BGS-48ND/ND

Approximate 50-μg/L outline of Cr(VI) or Cr(T) t ti i th U A if

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Coon

Canyon

Rd

Coon Canyon Rd

Coo

n C

anyo

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Mountain General Rd

Mountain General Rd

SEENOTE 3

Northern Disputed Plume Area

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SA-MW-01S34/30

SA-MW-06S130/120

CA

CA-MW-412D72/65

CA-MW-501S10/9.1

DW-022.3/2.1

MW-1097.8/6.9

MW-118S2.6/2.9

MW-119S2.5/3.1

MW-121S2.3/2.1

MW-155S0.62/1.1

MW-159D5.9/6

MW-159S6.1/5.6

MW-163DND/ND

MW-163S8.8/8.5

MW-164S1.9/1.9

1.6/2.4

MW-177S0.79/ND

MW-180RS72/72

MW-182S3.6/3.5

MW-183S28/25

MW-20ND/ND

MW-203S2.7/2.4

MW-371.1/1.3

MW-45A1.4/1.4

MW-540.9/ND

MW-61.1/1

MW-66A4.1/3.6

MW-67B0.58/ND

MW-74D3.8/3.7

SA-MW-11S670/720 J

SA-MW-16S210/220

SA-MW-17S230/230

SA-MW-26S260/260

SA-SM-01S440/450SA-SM-02S

1800/1900

SC-MW-12S210/230

SC-MW-13S120/120

SC-MW-21S400/420

CA-MW-313R220/220

SA-MW-38S70/69

SA-SM-03SR190/210

MW-208S1800/2000

MW-293/3

SC-MW-11SR(110/110)

MW-04380/390

MW-181S0.82/ND

MW-61R(2.6/2.4)

CA-M

DW(1.5

MW-147S(3.1/3)

MW-148S(2.1/2)

MW-149S1.4/1.6

MW-15660/680

MW-158SR1/1.9

MW-168S(1.4/1.4)

MW-169S2(2.3/2.4)

MW-201S(1.4/1.8)

MW-202S(1.7/1.9)

MW-38A(1.1/1.2)

MW-57(1.7/2.6)

MW-58(0.57/ND)

MW-76S(3.5/3.6)

CA-MW-312D30/27

EX-043.5/3.3

EX-153/2.7

EX-16(3.5/3.4)EX-17

(ND/ND)

EX-206.4/5.9

EX-21(1.9/1.8)

EX-2241/38

EX-232.2/1.9

EX-297.3/6.7

EX-3011/11

EX-36(1.8/1.6)

EX-379.9/9.1

EX-92/

EX-4413/30

EX-45330/390

IW-019/1

IW11

MW-119D1.6/2.1

MW-121D3.6/3.5

MW-153S3.6/4.1

MW-155DND/ND

MW-164DND/ND

MW-177D1.5/1.7

MW-178D150/160 MW-180RD

160/160

MW-182D3.7/3.6

MW-183D28/25

MW-203D2/2

MW-21B7/6.

MW-4.7/4

MW-312.3/2.4

MW-3650/44

MW-38B20/19

MW-42.3/2

M

MW-73D0.74/1.2

MW-75D0.57/ND

SA-MW-07D690/680

SA-MW-26D1/1

SA-SM-08D640/670

SC-MW-11DND/ND

CA-MW-412D2ND/ND

MW-74D2ND/ND

SA-MW-38D300/320

MW-108D13/13

MW-28B3.6/3.1

SA-MW-11D21/20

SA-MW-18D210/220

SC-MW-13D3/3.9

MW-181D0.83/1

EX-03(2.9/2.8)

MW-101D(3.3/3.3)

MW-122D(ND/ND)

MW-147D(2/1.9)

MW-44B(1.6/2.2)

MW-45B(1.2/1.3)

MW-47(2/2)

MW-57D(2/2.8)

EX-05(2.1/2.1)

MW-220D0.36/ND

MW-220SDRY

22-620.14/ND 22-75

2.2/1.9

27-161.4/1.2

27-261.5/1.327-42

0.5/ND

27-431.5/1.2

27-480.69/ND

27-492.2/2.0

28-201.3/ND

28-212.6/2.2

28-362.1/2.1 28-51

0.17/ND

34-771.0/ND

02-02A0.5/ND02-02B

2.0/1.7

02-230.61/ND

1.8/1.7

21-031.1/ND

IN-01

IN-02

IN-03

IN-04

IN-05

IN-06

IN-03R

Approximate 10-μg/L outline of Cr(VI) or Cr(T) concentrations in the Upper Aquifer, Third Quarter 2017

Approximate outline of Cr(VI) or Cr(T) concentrationsin the Upper Aquifer exceeding 3.1 and 3.2 μg/L, respectively, Third Quarter 2017.

Alcudia Rd

Front ier RdH

ope

St

Park Ave

Acacia St

Syc

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t

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Riv

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d

Indi

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Rd

Locu

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Hill

view

Rd

Granada Rd

Willow Springs Rd

Kinski Rd

Flow

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Ser

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d

Mou

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Rd

Valle

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ells

Rd

Hin

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Rd

Carson Rd

Aquarius Rd

SEENOTE 3

Riverview Rd

Z:\GISPROJECTS\_ENV\RC000699.0001_PGE_HINKLEY\GIS\GEC\MXD\GMP\3Q17\FINAL\FIG5-5_PLUMEMAP_UA_3Q17.MXD 11/6/2017

LEGEND:!. Monitoring Well!> Domestic Supply Well (active and inactive)!+ Other Supply Well "/ Groundwater Extraction Well")E Multi-use Test Well, or Inactive Extraction/Injection Well# IRZ_INJ

@A Freshwater Injection WellPG&E-Owned PropertyPG&E Compressor StationCounty ParcelApproximate Limit of Saturated Alluvium Upper Aquifer

! ! ! !

Approximate Location of Lockhart Fault; Fault Trace is Inferred, and There is No Surface Expression (Stamos et al. 2001)Bedrock Exposed at Ground Surface

NOTES:1. Chromium results are shown for Site-wide Groundwater Monitoring Program and domestic wells sampled in t the reporting period, the most recent results are shown.

2. The concentration contours are based on Third Quarter 2017 chromium results for the groundwater monitorin Figures 5-1 and 5-2. Results for domestic wells (brown-colored labels) were not used for chromium plume co Control Board's Cleanup and Abatement Order dated November 4, 2015 (Water Board 2015).

3. Pursuant to the Lahonton Regional Water Quality Control Board's Cleanup and Abatement Order dated Nove of the Lockhart Fault and on or east of Dixie Road. Monitoring wells sampled southwest of Lockhart Fault and

4. Chromium plume contours in the general area south of Highway 58, were developed using a larger set of mo the In Situ Reactive Zone and Northwest Freshwater Injection Projects (Arcadis 2017). Select wells from that

WORK CITED:Arcadis. 2017. Third Quarter 2017 Monitoring Report for the In Situ Reactive Zone and Northwest Freshwater InCalifornia Regional Water Quality Control Board, Lahontan Region Order No. R6V-2008-0014 (Waste Discharg

Stamos, C.L., P. Martin, T. Nishikawa, and B.F. Cox. 2001. Simulation of Ground-Water Flow in the Mojave RivePrepared in cooperation with the Mojave Water Agency.

Water Board. 2015. Cleanup and Abatement Order No. R6V-2015-0068 Requiring Pacific Gas and Electric Com

Well IDCr(VI)/Cr(T) concentrations in μg/L; maximum of primary and duplicate samples during Third Quarter 2017 sampling.Data in parentheses are from previous reporting period. See Table E-1 for sample dates.

MW-177D1.5/1.7

(110/110)

μg/LCr(VI)Cr(T)JNDNS

Micrograms per LiterHexavalent ChromiumTotal Dissolved ChromiumEstimated ResultNot DetectedNot Sampled

ABBREVIATIONS:

Groundwater Cr(VI) Concentrations in Monitoring Wells:!. More than 1,000 μg/L!. 100 to 1,000 μg/L!. 50 to 100 μg/L

!. 10 to 50 μg/L!. 3.1 to 10 μg/L!. Less than 3.1 μg/L or ND

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C-025.2/4.9

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A-MW-402S92/84

MW-01320/330

MW-03A31/28

MW-102S2/2

MW-110S4.6/4.4

MW-112S(3/3.4)

MW-143S4/3.4

MW-145S(2.8/2.9)

MW-1611/9.8

MW-17100/92

MW-178S160/150

MW-209S48/43

MW-210SND/ND

MW-211S0.67/ND

MW-21A2.4/2.3

MW-27A11/9.7

MW-32S2.8/3.2

MW-41S9.6/10

MW-49S4.1/3.6

MW-50S15/14

2.3/3

63.7

MW-77S0.62/1

MW-78S2/1.9

MW-87S(3.6/4.3)

MW-95S(8.4/8.5)

MW-96S2.3/2.3

PMW-051300/1300

SA-MW-09S0.2/ND

SA-MW-25S12/11

SC-MW-01S0.52/ND

SC-MW-02S0.57/ND

SC-MW-03S0.68/1.1

SC-MW-04S0.76/1.1

SC-MW-06S1.4/1.3

SC-MW-07S1.5/1.9

SC-MW-10S1.3/1.5

S

Y-013.5/3.5

Y-034.8/4.1

MW-213S5.4/5

MW-214S0.32/ND

MW-215SND/ND

SA-MW-37S10/14

SA-MW-34S52/47

MW-217S6.5/7

MW-216S1.3/1.6

MW-218S1.3/1.6

CA-MW-310S2.9/3.7 CA-MW-411S

22/20

CA-MW-317S2.9/2.5

MW-07(1.4/1.4)

MW-392.1/2

MW-460.5/ND

MW-86S4.9/4.9

MW-88S5.8/5

SA-MW-04S340/340

SC-MW-15S0.74/ND

SC-MW-16S0.88/1.1

SA-MW-35S2.7/3.2

MW-33A(1.8/2.2)

X-1045/42

SC-MW-08S2.4/2.5

SC-MW-09S2.1/2.8

G-5R2.4/2.1

MW-14A1.9/1.7

MW-179S0.61/ND

PMW-0283/70

PMW-04ND/2

MW-301(42/38)

W-03/2.1)

MW-05(0.59/ND)

MW-115S2.1/2

MW-146S1.8/1.8

MW-199S11.9/2.2

SA-MW-36S15/16

BW-01D6/5.6

C-01(2.4/2.1)

C-04(2.2/2.2)

CA-MW-107DND/ND

CA-MW-510D12/11

EX-0211/9.7

EX-254.1/3.9

EX-276.4/5.8

EX-3420/18

EX-3824/23

EX-39250/260EX-40

120/120EX-4121/27

EX-42190/170

-4389

50

EX-4631/27

EX-4721/19

EX-4832/28

EX-4994/95

EX-50200/210

EX-5119/19

EX-527.1/6.3

0117W-021/9.5

IW-03NS/5

MW-0329/26 J

MW-102D2.5/2.2

MW-110D1.5/1.6

MW-11B56/51

MW-143D21.6/1.8

MW-179D27/26

MW-1845/45

MW-192D(2.7/2.7)

B1.4

-23B4.3

MW-32B14/3.8

MW-39D37/33

43.1

MW-49B1.9/1.7

MW-55A0.67/NDMW-62A

2.1/1.8

PGE-060.78/ND

PMW-03ND/ND

PT2-MW-10ND/ND

SA-MW-05D1100/1200

SA-MW-10D210/170SA-MW-20D

ND/ND

SA-MW-25D0.81/ND

SA-MW-27D1.4/1.6

SC-MW-01D1.3/1.4

SC-MW-02D190/170

SC-MW-03D330/310

SC-MW-04D0.85/1.1

SC-MW-05D1.1/1.3

SC-MW-06D1.4/1.5

SC-MW-07D1.3/1.6

SC-MW-09D2/2.7

SC-MW-10D1.5/1.5

SC-MW-26D410/440

X-041/1.4

X-053.5/3.3

X-06220/230

X-0932/31

X-123.3/3.2

X-1377/75

MW-213DND/ND

MW-214DND/ND

MW-215D0.43/ND

SA-MW-37D10/10

SA-MW-35D4.2/4.4

MW-217DND/ND

MW-216D1.9/1.7

MW-218D0.35/ND

CA-MW-405DND/ND

FW-010.84/ND FW-02

1/ND

FW-03ND/ND

FW-04ND/ND

MW-27B4.3/3.9

MW-42B18.1/7.1

MW-49A3.7/3.1

MW-567/6.3

SA-MW-15D76/74

SA-SM-11D75/72

SC-MW-38D34/32

MW-12B14/13

MW-132.6/2.7

SA-MW-34D0.3/2

CA-MW-302D110/99

MW-14B32/28

MW-17D1.2/1.3

MW-78D3/2.9

MW-22B17/15

MW-42B29.1/8.1

MW-86D1.8/1.9

MW-88D1.2/1.3

MW-09(2/1.8)

MW-103D1.1/1.6

MW-115D3.6/3.4

MW-116D1(1.6/1.8)

MW-146D11.3/1.5

MW-50B3.9/3.6

MW-87D(3.1/3.7)

SA-MW-36D1.9/2

EX-5318/17

EX-0137/32

SA-MW-39D640/730

01-01A1.1/ND

26-65ND/ND

26-66ND/ND

36-260.89/1.1

36-411.3/ND

30E-121.8/1.7

concentrations in the Upper Aquifer, Third Quarter 2017 (Dashed where inferred)

Approximate 1,000-μg/L outlineof Cr(VI) or Cr(T) concentrations in the Upper Aquifer, Third Quarter 2017

Fai

rvie

w R

d

Dix

ie R

d

Acacia St

Dix

ie R

d

Highcrest Rd

Alcudia Rd

Community Blvd

Santa Fe Ave

Lenwood Rd

Lenw

ood

Rd

Lenw

ood

Rd

Riv

ervi

ew R

d

UV58

Sum

mer

set

Rd

Barstow-Bakersf ield Highway

FIGURE 5-5CHROMIUM RESULTS FOR THIRD QUARTER 2017 GROUNDWATER MONITORING AND DOMESTIC WELL SAMPLING AND MAXIMUM COMPOSITE PLUME OUTLINE IN UPPER AQUIFER THIRD QUARTER 2017 GROUNDWATER MONITORING REPORT AND DOMESTIC WELL RESULTSSITE-WIDE GROUNDWATER MONITORING PROGRAM PACIFIC GAS AND ELECTRIC COMPANY HINKLEY COMPRESSOR STATIONHINKLEY, CALIFORNIA

the Third Quarter (July through September) 2017 monitoring period. For wells sampled multiple times during

ng and extraction wells that are completed in the shallow zone and deep zone of the Upper Aquifer as noted on ontouring, except for those in the northern disputed plume areas, pursuant to the Lahonton Regional Water Quality

ember 4, 2015 (Water Board 2015), groundwater monitoring wells are not used for chromium contouring if they are located in the areas southwestd east of Dixie Road were sampled in support of United States Geological Survey background chromium investigations.

onitoring data which is presented in the October 30, 2017 Third Quarter 2017 Monitoring Report fort program are shown here for reference.

njection Projects, Pacific Gas and Electric Company, Hinkley Compressor Station, Hinkley, California, e Requirements Identification No. 6B369107001). October 30.

er Basin, California. U.S. Geological Survey Water-Resources Investigations Report 01-4002, Version 3.

mpany to Cleanup and Abate Waste Discharges of Total and Hexavalent Chromium to the Groundwaters of the Mojave Hydrologic Unit. November 4. 0 1,000 2,000Feet

±