1  

Potential Impacts of Variance: 

Work Variance Request Form Groundwater Remedy Phase 1 Construction, PG&E Topock Compressor Station, Needles, California 

PG&E TOPOCK GROUNDWATER REMEDIATION PROJECT 

Work Variance Request #8 – Proposed changes to the alignment of Pipeline C Segment C6  

Request Prepared By: PG&E  

Date Submitted: September 10, 2019 

Variance Request No.: 8 

Location: The eastern slope of the MW‐20 Bench, just south of the stairway from floodplain to the bench top 

Request Approval From: DTSC and DOI 

Date Approval Required: TBD 

Map Area: N/A 

Land Manager: BLM         Land Owner Parcel No: 650‐161‐09 

Current Vegetative Cover/Land Use: Several palo verde/mesquite trees along with creosote bushes   

Existing Sensitive Resource?       No     X    Yes, Specify: Ethnobotanical plants 

Variance From:  Mitigation Measure  Work Plan/Procedure  Response to Comments 

Drawing  Permit Condition  Other   

Detailed Description of Variance and Justification (Attach additional information if necessary): 

Attachments:  Photo        X   Construction Drawing   Aerial Photo Mark‐Up  Correspondence  Other  

 Air Quality            Hazardous Materials  Aesthetic (see visualizations) 

 Biological Resources           Noise   Water Resources 

Soils           Paleo Resources 

Cultural Resources           Hydrology and Water Quality 

X 

X 

Description and Justification: 

This Work Variance Request (WVR) addresses proposed changes to the alignment of Pipeline C Segment C6 to reduce the amount of soil disturbance, reduce the number of plants to be removed, reduce the safety risks associated with construction atop the MW‐20 bench, and reduce the hazards associated with operation at the MW‐20 bench during construction. The specifics are described below and included in the attached drawings. 

a) Reduce amount of soil disturbance. The original alignment in the 100% design would generate approximately 1430 cubic yards (CY) of excavated soil, mostly (1040 CY) from atop the MW‐20 bench. The original alignment requires excavation to about 7.5 feet below ground surface (bgs) for the entire segment C6 extent atop the Bench to allow undercrossing and installation alongside the existing IM‐3 utilities.  Some of the bench top excavation volume is due to sidewall benching for excavation protection. 

PG&E proposes to shift the alignment south where the pipeline can be dug to a depth of about 3.5 feet bgs, leaving deeper excavation limited only to crossing small‐diameter IRZ lateral pipes and conduits under the existing IM‐3 utilities. This shift reduces the amount of soil disturbance by 57% to 610 CY. 

b) Reduce number of plants to be removed. The original alignment would require the removal of about three palo verde trees and four creosote bushes. The proposed alignment would save those plants, but would require the removal of two mesquite trees and one creosote bush. Every effort will be made to swing the alignment as far north as possible to further reduce the number of plants to be removed. 

c) Reduce safety risks associated with deep excavation and working under energized utilities. The original alignment would require exposure of 110 feet of active IM‐3 utilities to allow for crossing of the Segment C6. The IM‐3 facilities would remain energized during construction, posing a significant health and safety risk for workers that would have to work directly underneath the exposed and energized utilities. Energized utilities include power and IM‐3 process water/waste. In addition, deep excavation to about 7.5 feet bgs would occur, and construction access would …. 

X 

20+00

20+50

21+00

2

1

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0

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2

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25+50

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20+00 21+00 22+00 23+00 24+00 25+00

E

E

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IL

IT

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IN

G

UT

IL

IT

Y C

RO

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IN

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22+75

IRZ-14

IRZ-15

IRZ-16

IRZ-17

IRZ-18 IRZ-20

IRZ-21

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E T

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EL

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EXISTING GROUND

TRENCH DEPTH

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L EXIST. 2-3" ELECTRIC AT 24" BGS

C

L EXIST. 2-3" ELECTRIC AT 24" BGS

C

PIPELINE "C" - PLAN

(SCALE: 1" = 20')

PIPELINE "C" - PROFILE

(SCALE: 1" = 20' H; 1" = 10' V)

N

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H

W

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HH3-1E,I

HH3-2E,I

HH3-3E,I

HH3-4E,I

HH3-5E,I

HH4-14E,I

HH4-15E,I

WARNING: UTILITY CROSSING

F

O

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C

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I

N

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A

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E

S

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7

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HORIZ: SCALE: 1"=20'

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VERT: SCALE: 1"=10'

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4-1

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C-07-122

P4-16

C-07-122

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C-07-121

HH

3-4E

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P3-5

C-07-121

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TC

HL

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C-07-121

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HH

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P3-2

C-07-121

P3-1

C-07-121

520

510

500

490

480

520

510

500

490

480

470

460

PIPELINE "C"

VAULT, TYP.

(SEE NOTE 1)

WELL CASING

VAULT, TYP.

(SEE NOTE 1)

VAULT, TYP.

WELL CASING

VAULT, TYP.

WARNING: UTILITY CROSSING

PIPELINE "A"

M

A

T

C

H

L

I

N

E

C3

C-07-108

C4

C-07-108

C6

C-07-108

VAULT, TYP.

(SEE NOTE 1)

P3-7

C-07-121

P3-4

C-07-121

HH

3-4

AE

,I

HH3-6E,I

HH3-4AE,I

HH

3-6

E,I

P4-17

C-07-122

FO

R C

ON

TIN

UA

TIO

N

SE

E S

HE

ET

C

-0

6-0

3

C-07-41

PIPELINE - PLAN AND PROFILE

PIPELINE "C3", "C4", & "C6"

STA 19+60 TO STA 25+79

NOTES:

1. VAULT DETAILS SHOWN IN AREA 4 OF THE

MECHANICAL AND STRUCTURAL DRAWINGS.

2. SEE CONDUIT AND CABLE SCHEDULES AND SINGLE

LINE DIAGRAMS ON SHEETS E-00-12 THRU E-00-20.

3. CLEANOUT LOCATIONS PROVIDE CLEANOUT PIPING

FOR ALL INJECTION, EXTRACTION, BACKWASH, AND

REMEDY-PRODUCED WATER LINES AT INDICATED

LOCATIONS (SEE DETAIL C-00-08).

4. FOR LATERALS TO REMEDIATION WELLS, SEE

DETAIL 3 ON SHEET C-07-141.

5. FOR COORDINATES TO STRUCTURES ALONG

PIPELINE OR RADIUS POINT INFORMATION, SEE

SHEETS C-07-91 AND C-07-92.

SEE NOTE 4

11

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7-4

1

5

JPBKLD JEFAJW04/05/13 INTERMEDIATE (60%) DESIGN0

JPBBAS JEFAJW09/08/14 PRE-FINAL (90%) DESIGN1

RAO

BWWLM RAOAJW11/18/15 FINAL DESIGN2

BWJPB RAOAJW06/16/17 ISSUED FOR BID3

4CALTRANS ENCROACHMENT PACKAGE

VJM JPBMAG

RAO

11/02/18

CP53

CP56

CP59

CP61

CP63

CP71

CP72

CP80

CP79

CP78

CP77

CP76

CP83

CP84

CP94

CP95

CP96

CP97

CP104

RP14

RP15

1

C-07-112

CP54

CP55

CP57

CP58

CP60

CP62

CP64

3

C-07-112

6

C-00-08

CP67

CP68

CP65

CP66

CP69

CP70

CP73

CP75

CP74

6

C-00-08

13

C-07-119

CP81

CP82

1

C-07-112

CP89

CP90

CP86

CP85

CP87

CP88

CP91

CP92

CP93

CP98

CP99

CP100

CP101

CP106

CP102

CP103

CP105

MAGJPB RAODMM11/16/18 ISSUED FOR CONSTRUCTION5

EXISTING UTILITY WARNING

TOPOCK GROUNDWATER REMEDIATION PROJECT

11

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1

7

I

R

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-

2

0

I

R

Z

-

2

1

20+00 21+00 22+00 23+00 24+00 25+00

MW

20

B

EN

CH

FE

NC

E A

T

23+75

26+00

IRZ-14

IRZ-15

IRZ-16

IRZ-17

IRZ-18

IRZ-20

IRZ-21

TE

E T

O P

IP

EL

IN

E A

TRENCH DEPTH

JU

NC

TIO

N P

OIN

T

TO

M

W-2

0 B

EN

CH

EXISTING GROUND

PIPELINE "C" - PLAN

(SCALE: 1" = 20')

PIPELINE "C" - PROFILE

(SCALE: 1" = 20' H; 1" = 10' V)

N

A

T

I O

N

A

L T

R

A

I L S

H

W

Y

.

HH3-1E,I

HH3-2E,I

HH3-3E,I

HH3-4E,I

HH3-5E,I

HH4-14E,I

HH4-15E,I

0 60

HORIZ: SCALE: 1"=20'

20 40

0 30

VERT: SCALE: 1"=10'

10 20

HH

4-1

4E

,I

P4-15

C-07-122

P4-16

C-07-122

HH

4-1

5E

,I

MA

TC

HL

IN

E F

OR

C

ON

TIN

UA

TIO

N S

EE

S

HE

ET

C

-0

7-4

0

HH

3-5E

,I

P3-6

C-07-121

HH

3-4E

,I

P3-5

C-07-121

MA

TC

HL

IN

E F

OR

C

ON

TIN

UA

TIO

N S

EE

S

HE

ET

C

-0

7-4

0

HH

3-1

E,I

520

510

500

490

480

520

510

500

490

480

470

460

PIPELINE "C"

VAULT, TYP.

(SEE NOTE 1)

WELL CASING

VAULT, TYP.

(SEE NOTE 1)

VAULT, TYP.

WELL CASING

VAULT, TYP.

PIPELINE "A"

C3

C-07-108

C4

C-07-108

C6B

C-07-108

VAULT, TYP.

(SEE NOTE 1)

P3-7

C-07-121

P3-4

C-07-121

HH

3-4

AE

,I

HH3-6E,I

HH3-4AE,I

HH

3-6

E,I

P4-17

C-07-122

FO

R C

ON

TIN

UA

TIO

N

SE

E S

HE

ET

C

-0

6-0

3

C-07-41

PIPELINE - PLAN AND PROFILE

PIPELINE "C3", "C4", & "C6"

STA 19+60 TO STA 25+79

NOTES:

1. VAULT DETAILS SHOWN IN AREA 4 OF THE

MECHANICAL AND STRUCTURAL DRAWINGS.

2. SEE CONDUIT AND CABLE SCHEDULES AND SINGLE

LINE DIAGRAMS ON SHEETS E-00-12 THRU E-00-20.

3. CLEANOUT LOCATIONS PROVIDE CLEANOUT PIPING

FOR ALL INJECTION, EXTRACTION, BACKWASH, AND

REMEDY-PRODUCED WATER LINES AT INDICATED

LOCATIONS (SEE DETAIL C-00-08).

4. FOR LATERALS TO REMEDIATION WELLS, SEE

DETAIL 3 ON SHEET C-07-141.

5. FOR COORDINATES TO STRUCTURES ALONG

PIPELINE OR RADIUS POINT INFORMATION, SEE

SHEETS C-07-91 AND C-07-92.

SEE NOTE 4

09

/0

4/2

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9, 1

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7-3

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5

2.d

wg

, T

ab

: C

-0

7-4

1

6

JPBKLD JEFAJW04/05/13 INTERMEDIATE (60%) DESIGN0

JPBBAS JEFAJW09/08/14 PRE-FINAL (90%) DESIGN1

RAO

BWWLM RAOAJW11/18/15 FINAL DESIGN2

BWJPB RAOAJW06/16/17 ISSUED FOR BID3

4CALTRANS ENCROACHMENT PACKAGE

VJM JPBMAG

RAO

11/02/18

CP53

CP56

CP59

CP61

CP63

CP71

CP72

CP80

CP79

CP78

CP77

CP76

CP83

CP84

CP94

CP95

CP96

CP97

CP104

RP14

RP15

1

C-07-112

CP54

CP55

CP57

CP58

CP60

CP62

CP64

3

C-07-112

6

C-00-08

CP67

CP68

CP65

CP66

CP69

CP70

CP73

CP75

CP74

6

C-00-08

13

C-07-119

1

C-07-112

CP86

CP85

CP87

CP88

CP93

CP98

CP101

CP106

CP102

CP103

CP105

MAGJPB RAODMM12/07/18 ISSUED FOR CONSTRUCTION5

EXISTING UTILITY WARNING

TOPOCK GROUNDWATER REMEDIATION PROJECT

09

/0

4/2

01

9, 1

5:3

5, G

:\A

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7-3

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5

2.d

wg

, T

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: C

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7-4

1

STUB OUT FOR IRZ-18

STUB OUT FOR IRZ-22

WARNING: UTILITY CROSSING

F

O

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C

O

N

T

I

N

U

A

T

I

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N

S

E

E

S

H

E

E

T

C

-

0

7

-

4

3

M

A

T

C

H

L

I

N

E

ENCASE CONTENTS

OF PIPELINE C6 WITH

1500 PSI CONCRETE

5 LF AT THE TOE AND

TOP OF SLOPE

P3-1

C-07-121

BLPJPB RAOVJM08/20/19 C6 REALIGNMENT6

6

C6A

C-07-108

C6C

C-07-108

12KV ELECTRICAL

VAULT PBX-T3P

ENCASE CONTENTS

OF PIPELINE C6 WITH

1500 PSI CONCRETE

5 LF AT THE TOE AND

TOP OF SLOPE

4'-0"

9

4

6

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EC

TR

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AL

T

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NC

H

SP

6"

TYP.

TRACER

WIRE

6"

L 6" N IRZ EX

C

2'-0"

MIN

.

L 4" N IRZ INJ

C

L 2" BW N

C

L 6" SP

C

2'-6"

2'-0"

MIN

.

6

ELE

CT

RIC

AL T

RE

NC

H

SP

TRACER

WIRE

6"

L 6" N IRZ EX

C

L 6" SP

C

5'-2"

4

ELE

CT

RIC

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NC

H

SP

6"

TYP.

TRACER

WIRE

68

9

6"

L 6" RB EX

C

L 6" N IRZ EX

C

2'-0

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MIN

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L 6" N IRZ

C

INJ

L 2" BW N

C

L 6" SP

C

14'-1"

2'-0

" M

IN

.

25

15

11

16SP SP SP

13

18

TRACER

WIRE

10

5 178

6"

ELE

CT

RIC

AL T

RE

NC

H

L 8" FW

C

L 2" BW S

C

L 3" TWB

C

L 6" RW

C

L 2" TW

C

L 8" FW

C

L 6" RB EX

C

L 6" S IRZ INJ

C

L 6" FPW

C

L 6" SP

C

L 6" SP

C

L 6" SP

C

L 4" TCS INJ

C

L 6" S IRZ

C

EX SP

SECONDARY

CONTAINMENT

10'-6"

SP

11

ELE

CT

RIC

AL T

RE

NC

H

SP4 38 6

9

6"

2'-0

"

MIN

.

L 6" N IRZ

C

L 6" UPGRAD INJ

C

L 6" N IRZ EX

C

L 6" UPGRAD BW

C

L 2" BW N

C

L 6" SP

C

L 6" SP

C

INJ

L 8" FW

C

L 8" FW

C

L 6" RB EX

C

2

TRACER

WIRE

SP SP

6

9

L 6" N IRZ

C

L 6" UPGRAD INJ

C

L 6" N IRZ EX

C

L 6" UPGRAD BW

C

L 2" BW N

C

L 6" SP

C

L 6" SP

C

INJ

12'-1"

15

1

16 SP SP SP

13

18

TRACER

WIRE

105 178

L 2" BW S

C

L 6" RW

CL 2" TW

C

L 2" FW

C

L 6" RB EX

C

L 6" S IRZ INJ

C

L 6" FPW

C

L 6" SP

C

L 6" SP

C

L 6" SP

C

L 4" TCS INJ

C

L 6" S IRZ

C

EX SP

SECONDARY

CONTAINMENT

25

L 3" TWB

C

243

TRACER

WIRE

1'

2'-0

" M

IN

.

SP(e)

23

SP(e)

21

22

1' - 6"

1'-6

" M

IN

.

20

21

2" RED DYE CLSM

OR CONCRETE

SLURRY

SP SP

6

9

L 6" N IRZ

C

L 6" UPGRAD INJ

C

L 6" N IRZ EX

C

L 6" UPGRAD BW

C

L 2" BW N

C

L 6" SP

C

L 6" SP

C

INJ

12'-1"

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15

1

16 SP SP SP

13

18

TRACER

WIRE

105 178

L 2" BW S

C

L 6" RW

CL 2" TW

C

L 2" FW

C

L 6" RB EX

C

L 6" S IRZ INJ

C

L 6" FPW

C

L 6" SP

C

L 6" SP

C

L 6" SP

C

L 4" TCS INJ

C

L 6" S IRZ

C

EX SP

SECONDARY

CONTAINMENT

25

L 3" TWB

C

243

TRACER

WIRE

1'

SP(e)

23

SP(e)

21

22

1' - 6"

1'-6

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IN

.

20

21

PIPEZONE AND BACKFILL

ABOVE PIPEZONE MAY BE

CLSM OR CLSM AND NATIVE

MATERIAL.THE SURFACE

FINISH WILL CONSIST OF A

COLOR THAT BLENDS IN

WITH THE FLOODPLAIN

NATURAL COLOR PALETTE.

SP SP

6

9

L 6" N IRZ

C

L 6" UPGRAD INJ

C

L 6" N IRZ EX

C

L 6" UPGRAD BW

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L 2" BW N

C

L 6" SP

C

L 6" SP

C

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12'-1"

2'-0" M

IN

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15

1

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13

18

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10

5 178

L 2" BW S

C

L 6" RW

CL 2" TW

C

L 2" FW

C

L 6" RB EX

C

L 6" S IRZ INJ

C

L 6" FPW

C

L 6" SP

C

L 6" SP

C

L 6" SP

C

L 4" TCS INJ

C

L 6" S IRZ

C

EX SP

SECONDARY

CONTAINMENT

25

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C

243

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OR CONCRETE

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C1

C-07-39

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1"=1'-0"

C2

C-07-39

SECTION

1"=1'-0"

C3

C-07-39, -40,-41

SECTION

1"=1'-0"

C4

C-07-41

SECTION

1"=1'-0"

C6A

C-07-41

SECTION

1"=1'-0"

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C5

C-07-43,-44

SECTION

1"=1'-0"

BAS

6

KLD

C-07-108

TRENCH SECTIONS

WLMKLD BJWAJW8/5/15 90% RTC RESOLUTION2

JPB JEFAJW9/8/14 PRE-FINAL (90%) DESIGN1

JPB JEFAJW4/5/13 INTERMEDIATE (60%) DESIGN0

NOTES:

1. PIPE SUPPORTS AND CLEANOUTS NOT SHOWN FOR

CLARITY.

2. ALL COVERS SHALL BE TRAFFIC RATED.

3. CASING SPACERS NOT SHOWN FOR CLARITY.

4. PIPE BEDDING SHALL EXTEND TO CL OF THE

LARGEST PIPE.

5. REFER TO DETAIL 1 ON C-07-102 FOR PIPE SPACING.

RAO

BWWLM RAOAJW11/18/15 FINAL DESIGN3

BWJPB RAOAJW6/16/17 ISSUED FOR BID4

MAGJPB RAONAKISSUED FOR CONSTRUCTION5 12/07/18

PIPELINE C

PIPELINE C

PIPELINE C

PIPELINE C

PIPELINE C

BLPJPB RAOVJMC6 REALIGNMENT 6 08/20/19

6

C6B

C-07-41

SECTION

1"=1'-0"

C6C

C-07-41

SECTION

1"=1'-0"

Future Activity Allowance Determination Matrix for Work Variance Request (WVR)  

Work Variance Request No.   8      Date:  10/4/19 

Future Activity Allowance is an activity that is not considered in the remedy design but necessary to support the project objectives. Future Activity Allowance is a Material Deviation which is defined in the final groundwater remedy design as:  Material Deviation means a change or correction required to prevent a condition that would (1) render the approved design non‐compliant with codes, regulations, and /or engineering standard of practices, (2) render planned well locations and/or constructions fail to meet the project objectives, (3) cause significant schedule delay, and/or (4) cause a significant increase in costs. (CH2M Hill, 2015) 

 According to the SEIR Project Description, “The inclusion of the Future Activity Allowance is not intended to account for minor adjustments (work variances) of the remedy design during construction resulting from field conditions. DTSC’s objective for the inclusion of the Future Activity Allowance is to consider the potential impacts of needing to take additional but previously unforeseen activities that were not contemplated as part of the Final Remedy Design but are activities that would improve the performance of the remedy, or are necessary to gather additional information on the remedy performance, and/or aid in the transition of the active remedy to monitored natural attenuation.” (ESA, 2017)  1. Are all components of the WVR in the approved final design as reviewed in the SEIR? 

    ☒  Yes    ☐   No   2. Are all components of the WVR staying within an infrastructure alignment in the approved final 

design? 

☐  Yes     ☒  No 

If answers to both 1 and 2 are Yes, STOP – action is not Future Activity Allowance 

3. For components not in approved final design, will the WVR require new access not identified for use in the final design and create new ground disturbance beyond those anticipated in final design?        

☐  Yes     ☒  No 

If answer is No, STOP – action is not Future Activity Allowance.  If Yes, proceed…  4. For components not in approved final design and require new access or new ground disturbance, 

will the ground disturbing activity be outside the 2018 SEIR project boundary?   

☐  Yes     ☐  No 

If answer is Yes, STOP – action is subject to additional CEQA evaluation.  WVR approval will be considered after DTSC completes CEQA determination.  5. For WVR requiring new access and/or new ground disturbance, but project components are in 

approved final design and within the 2018 SEIR project boundary, is the variance necessitated by field conditions which are outside the control of the operator (e.g. refusal during drilling, unstable ground, existing design jeopardizes health and safety, modification to avoid archaeological resource, existing design does not conform to engineering standards, etc.)? 

☐  Yes     ☐  No 

If answer is No or otherwise explained in Section 7 below, action is Future Activity Allowance, follow Communication Protocol for Future Activities Allowance, Exhibit 3 to the Statement of Decision and Resolution of Approval.  If the answer is Yes, action is Future Activity Allowance, and DTSC will work with 

Future Activity Allowance Determination Matrix WVR No. 4  Page 2 of 2  Tribes to meet the time sensitivity of the WVR.  Regardless of response, because of new access and/or new ground disturbance, WVR action may be subject to Federal Consultation.  Inquire with BLM to determine whether there is a need to follow Consultation during Construction protocol.         6. Does the addition of WVR cause an exceedance from infrastructure limits specified in the 2018 

certified Final SEIR (Table 3‐1 for well boreholes; Table 3‐2 for pipeline trenches, electrical/ communication conduit, roadway improvements, or sizes of buildings and structures; Table 3‐4 for volume of soil disturbance and Table 3‐5 for water usage)?   

☐  Yes     ☐  No 

If answer is Yes, STOP – action is subject to additional CEQA evaluation.  WVR approval will be considered after DTSC completes a CEQA checklist to determine if there are new or substantially more significant environmental impacts than disclosed in the 2018 SEIR.   

7.  Other extenuating circumstances or information for FAA considerations:  ☐  No 

☐  Yes – provide information and/or justification            

Conclusion:  WVR No.    8        ☒  is not a FAA     ☐  is a FAA     Signature of DTSC reviewer:            Date:           10/04/2019