!.!.

!.!.

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..

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..

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MW-184S11.8/2.5

MW-184S34.6/5.3

MW-186S14.6/5.1

MW-186S34/5.4

MW 193S3

MW-194S15.8/5.6

MW-196S22.4/2.4

MW-205S13.1/4

MW-205S34.1/4.4

MW-196S1(3.6/4.6)

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e ri canA

ve

th

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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21-030.67/ND

22-211.9/2.1 22-44

1.7/1.7

22-481.5/1.6

22-620.93/ND

22-65ND/ND

22-731.8/2.1 22-75

1.9/2.0

22-80ND/ND

22-810.46/ND

22-820.96/1.2

22-932.8/3.5

23-302.8/3.1

MW-1043.3/

M

MW-123S11.9/2.2

MW-1(0.6

MW-127S21.3/1.6

MW-135S22/3.9

MW-136S13.9/3.9

MW-136S2ND/ND

MW-137S14.4/4.6

MW-137S24.4/4.9

MW-137S38.7/8.6

MW-142S22.9/3.3

MW-154S17/7.3

MW-154S22/2.3

MW-161S23/4

MW-162S13.9/4.3

MW-170S1.7/2.4

MW-172S13/3.3

MW-173S13.3/3.7

MW-174S13.3/3.2

MW-193S14.4/5.1

MW-193S24.7/4.9

MW-193S30.88/1.7

MW-200S10.74/1.1

MW-204S13.1/3.2

MW-204S24.1/4.4

MW-212S13.1/3.2

MW-212S22.9/3.8

MW-631.3/1.2

MW-83D0.66/NDMW-83S

1.9/2

MW-85S1.5/1.9

MW-89S2.3/2.1

MW-111S1(2.4/2.5)

MW-111S2(2.3/2.6)

MW-113S1(2.9/2.9)

MW-113S2(2.5/2.6)

MW-(1

MW-125S1(2.2/2.5)

MW-125S2(1.5/1.6)

MW-126S1(2.4/2.6)

MW-126S2(1.4/1.7)

MW-131S1(2.6.2.6)

MW-175S1(3.1/3.2)

MW-175S2(3/3.5)

MW-127S12.7/3.5

MW-(2

MW-

MW-133S17.3/7.5

MW-62A1.7/2

MW-85ND/ND

MW-89D0.61/ND

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

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Alcudia Rd

PlymouthRd

Bla

nca

Rd

Burnt TreeR

d

Pue

blo

Rd

Ser

ra R

d

Pet

ra R

d

Sonoma St

Sal inas Rd

Roy RdHolstead Rd

Fossil Bed RdA

merican

Way

Orc

hard

St

Mou

ntai

n V

iew

Rd

Hin

kley

Rd

Ho lstead Rd

Manacor Rd

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30E-011.8/1.9

BGS-480.16/ND

EX-315.5/5.7

EX-321.1/1.2

EX-334.5/4.4

EX-352 J/1.8

G-2R1.7/1.5

4S1/3.5

MW-105S2.5/3.1

MW-106S3.1/3.5

117S15/ND)

MW-128S13.8/4.3

MW-128S23.1/3.1MW-128S3

1.7/2.1

MW-206S2.2/4.3

MW-207S17.3/7.3

MW-207S23.1/3.2

MW-68S2.1/2.5

MW-70S1.1/1.9

MW-71S0.81/2.2

MW-72S4.7/4.6

MW-79S6/5.8

MW-80S2.8/2.8

MW-84S1.7/2S

9

MW-94D3.6/3.7

MW-112S(3.2/3.3)

MW-97S5.4/6.9

MW-96S2.6/2.8

117S2.2/1.2)

MW-197S10.58/ND

MW-166S2(ND/ND)

MW-166S1(ND/ND) MW-197S2

(ND/ND)

MW-219S13.2/4

MW-219S20.4/1.4

-124S12.6/2.9)

-124S2(2/2.2)

EX-254.6/4.6

G-1R1.4/1.3

MW-104DND/ND

MW-105DND/ND

MW-106DND/ND

MW-55A0.098/ND

MW-68D2.6/2.5

MW-70D0.93/1.3

MW-71D1.4/2.1

MW-79DND/ND

MW-84D0.09/ND

5DD

G-5R3.4/3.2

Approximate 50-μg/L outline of Cr(VI) or Cr(T) concentrations in the Upper Aquifer, First Quarter 2017 (Dashed where inferred)

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Thompson Rd

Coon

Canyon

Rd

Alcudia Rd

Coon Canyon Rd

Coo

n C

anyo

n R

dB

u rn t

Tre e

Rd

Mountain General Rd

Mountain General Rd

SEENOTE 3

Northern Disputed Plume Area

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IN-01

IN-02

IN-03

IN-04

IN-05

IN-06

IN-03R

02-02A0.49/ND

02-02B0.58/ND

02-230.56/ND

27-160.55/ND

27-261.4/1.4

27-420.27/ND

27-431.4/1.5

27-480.5/ND27-491.8/1.9

28-200.69/ND

28-211.3/5.0

28-360.74/2.4

28-373.0/3.3

28-383.1/3.4

28-51ND/ND

28-522.3/2.7

28-663.9/4.0

34-500.94/1.1

34-63ND/ND

34-770.57/ND

SA-MW-01S 74/79

SA-MW-06S 230/250

CA-MW-402S86/89

CA-MW-412D54/54 J

CA-MW-501S5.5/5.1

DW-022/1.7

EX-044.2/4.4

EX-153/2.9

EX-206.8/7

EX-212.7/2.8

EX30/

EX-297.3/7.5

MW-10913/14

MW-118S2.7/3.4

MW-119S2.2/2.8

MW-121S2.2/2.3

MW-155S0.46/1.1

MW-163DND/ND

MW-163S8.6/8.9

MW-164S2.1/2.5

MW-177S0.74/2.4

MW-178S160/190

MW-180RS170/170

MW-182S6.8/7.8

MW

EX-05

EX-16EX-17

MW-203S2.7/3 MW-29

5.7/5.9

MW-371.6/2.1

MW-45A1.5/1.8

MW-540.86/1.2

MW-66A3.7/3.8

MW-74D2.4/3.1

MW

SA-MW-11S340/360

SA-MW-16240/28

SA-MW-1220/2

SA-MW-26S220/250

SA-SM-01S390/420

SA-SM-02S1500/1800

SC-MW-12S310/340

SC-MW-13S120/130

SC-MW400/420

CA-MW-313R220/250

SA-MW-38S88/91

SC-MW-11SR110/110

MW-61R2.6/2.4

MW-159S6.4/6.7

MW-159D6.2/6.4

MW-67B0.59/1

CA-MW-4059

EX-0212/11

EX1.

EX-3015/17EX-36

1.7/1.7

EX-4370/73

EX-4638/38

EX-4725/28

IW18

MW-119D1.5/2

MW-121D3.6/4

MW-153S2/2.3

MW-155DND/ND

MW-164DND/ND

MW-177D1.5/2.7

MW-178D160/180

MW41

MW-180RD150/170

MW-182D4.3/4.6

MW3

MW-203D1.4/5.9

M7

MW-28B6.1/5.9

MW-312.8/2.6

MW-3667/71

MW-38B24/26

MW-1.9/2

MW-73D0.78/1.1

MW-75D0.6/ND

SA-MW-07D720/830

SA-MW-11D22/24

SA-MW-18D69/74

SA-MW-26D0.89/1.1

SC-MW-11DND/ND

EX-44

X1.8

X-1388/88

CA-MW-412D2ND/ND

SA-MW-38D300/330

MW-74D2ND/ND

EX-379.7/10

MW-108D13/13

CA-MW-302D100/110

SC-MW-134.9/6.1

MW-181D0.6/ND

MW-181S0.73/1.2

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

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

Alcudia Rd

Front ier Rd

Hop

e S

t

Park Ave

Acacia St

Syc

amor

e S

t

Hid

den

Riv

er R

d

Indi

an W

ells

Rd

Locu

stR

d

Red

Roc

k R

d

Hill

view

Rd

Granada Rd

Willow Springs Rd

Kinski Rd

Flow

erR

d

Ser

ra R

d

Mou

ntai

n V

iew

Rd

Valle

y W

ells

Rd

Hin

kley

Rd

Carson Rd

Aquarius Rd

SEENOTE 3

Riverview Rd

Z:\GISPROJECTS\_ENV\RC000699.0001_PGE_HINKLEY\GIS\GEC\MXD\GMP\1Q17\2017-04-25\FIG5-5_PLUMEMAP_UA_1Q17.MXD 4/25/2017

LEGEND:!. Groundwater Monitoring Well!

<

Agricultural Supply Well!> Domestic Supply Well!+ Other Supply Well "/ Groundwater Extraction Well (Active)")E Multiuse Test Well, or Inactive

Extraction/Injection Well# Inactive In Situ Reactive Zone Injection Well@A Freshwater Injection Well

PG&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 First 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. First 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 First Quarter 2017 sampling.Data in parentheses are from previous reporting period. See Table E-1 for sample dates.

MW-177D1.5/2.7

(1.8/2.2)

μg/LCAOCr(VI)Cr(T)JNDNS

Micrograms per LiterCleanup and Abatement OrderHexavalent 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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01-01A0.45/ND

25-162.3/2.6

26-65ND/ND

26-66ND/ND

36-411.8/1.8

SA-MW-34S30/30

BW-01S5.1/5.3

C-025.9/5.9

C-032.4/2.3

CA-MW-310S10/11

CA-MW-411S23/24

-2231

FW-021.1/1.1

FW-030.33/ND

FW-040.25/ND

IW-0212/12

IW-035.4/5.5

MW-03A24/26

MW-102S2.0/2.9

MW-110S4.2/4.2

MW-143S3.6/3.8

MW-145S2.5/3.2

MW-166.2/6.3

MW-1793/94

W-183S42/44

CA-MW-317S(3.6/3.8)

MW-07(1.4/1.4)

MW-20ND/ND

MW-208S2100/2400

MW-209S45/46

MW-210S12/12

MW-211S0.68/ND

MW-21A2.9/2.6

MW-27A11/10

MW-32S2.8/3.2

MW-392.8/3.3

MW-41S9.8/10

MW-460.62/ND

MW-49S5.2/5.6

MW-50S15/15

MW-55S1.5/1.8

MW-77S0.72/ND

W-78S1.9/2.2

MW-86S4.6/4.8

MW-87S3.2/3.3

MW-88S5.4/5.1

PMW-05ND/ND

SA-MW-04S360/400

SA-MW-09S25/27

6S80

7S250

SA-MW-25S7.7/8.4

SC-MW-01S0.54/1.5

SC-MW-02S0.66/1.4

SC-MW-03S4.1/4.3

SC-MW-04S0.78/ND

SC-MW-06S1.4/2.2

SC-MW-07S1.6/2.6

SC-MW-10S2/2.3

SC-MW-15S0.68/1.2

SC-MW-16S0.88/1.2W-21S

0

Y-014.8/4.3

Y-035.7/5.3

MW-213S4.4/5.1

MW-214SND/ND

SA-MW-37S12/13

SA-MW-35S3.9/4.2

MW-217S5.1/5.5

MW-216S1.3/1.7

MW-218S1.3/1.8

SA-SM-03SR79/100

MW-33A(1.8/2.2)

X-1045/48

MW-215SND/ND

MW-95S(8.2/8.1)

MW-01770/810

SC-MW-08S2.2/3.1

SC-MW-09S1.8/2.3

BW-01D5.2/5.6

CA-MW-107DND/ND

05D9/62

CA-MW-510D18/19

2

X-238/1.8

EX-278.6/8.6

EX-3422/22

EX-3822/23

EX-39180/210

EX-40410/420

EX-4127/30

EX-42230/240

EX-45390/420

EX-4860/57

EX-49410/450

EX-50200/210 EX-51

8.7/11EX-523.9/4.3

FW-010.99/1

W-018/18

MW-0339/40

MW-102D2.5/2.9

MW-110D1.5/1.9

MW-11B43/44

MW-143D21.5/1.7

MW-179D28/32

W-181/44

W-183D36/40

MW-192D3.2/3.9

MW-21B111/10

MW-23B7/6.6

MW-27B3.9/3.9

MW-32B14.3/4.3

MW-39D32/35

MW-42B215/14

-432.2

MW-49A3.5/3.4

MW-565.9/6.1

PMW-03ND/2.1 J

PT2-MW-10ND/1.4

SA-MW-05D1200/1200

SA-MW-10D550/540

SA-MW-15D85/98

SA-MW-20D1.8/9.3

SA-MW-25D0.76/ND

SA-MW-27D1.6/1.9

SA-SM-08D660/690

SA-SM-11D15/17

SC-MW-01D1.1/2.7

SC-MW-02D180/190

SC-MW-03D290/310

SC-MW-04D1/1.2

SC-MW-05D1.2/1.9

SC-MW-06D1.2/2.1

SC-MW-07D1.2/1.7

SC-MW-09D2/2.9

SC-MW-10D1.5/1.8

SC-MW-26D800/880

SC-MW-38D48/50

X-046.4/6.8

X-054.6/4.6

X-06100/110

MW-12B(12/12)

MW-13(9.2/8.9)

X-0952/52

X-128/2.3

38

MW-213D0.44/1.2

MW-214DND/ND

SA-MW-37D13/14

SA-MW-34DND/ND

SA-MW-35D2.5/2.7

MW-217DND/ND

MW-216D1.5/1.9

MW-218DND/ND

MW-215DND/1.4

PGE-06(0.52/ND)

3D

C-012.3/2

C-042.3/2.4

MW-42B112/12

MW-14B27/26

MW-17D1.4/1.7

MW-78D1.5/2

MW-22B19/19

MW-49B1.9/1.9

MW-86D1.6/1.8

MW-88D1.1/1.3

MW-04410/440

MW-14A2.9/2.7

MW-179S0.71/2.1

PMW-0290/92

PMW-04ND/2.8

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

Fai

rvie

w R

d

Dix

ie R

d

Acacia St

Dix

ie R

d

Highcrest Rd

Community Blvd

Santa Fe Ave

Lenwood Rd

Lenw

ood

Rd

Lenw

ood

Rd

Riv

ervi

ew R

d

UV58

Sum

mer

set

Rd

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

the First Quarter (January through March) 2017 monitoring period. For wells sampled multiple times during

g 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 April 28, 2017 First 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). April 28.

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

±