sludge sedimentation basins initial periodic hazard

Sludge Sedimentation Basins Initial Periodic Hazard Potential Classification

Clover Power Station Clover, Virginia

October 2016

()TRC

Sludge Sedimentation Basins Initial Periodic Hazard Potential Classification

Clover Power Station Clover, Virginia

October 2016

Prepared For Virginia Electric and Power Company

;h~tstream ' Senior Scientist Senior Engineer

© 201 6 TRC TRC Engineers, Inc. I Dominion Virginia Power All Rights Reserved

Sludge Sedimentation Basins - Initial Periodic Hazard Potential Classification Final \ \ NTAPA -GRNVILLE \GVL-VOLS \-\ WPGVL \ P/T2 \ 232002 \ 0000 \ 000001 \ R2320020000PH1-004.00CX

Table of Contents Section 1 Background ................................................................................................................................ 1

1.1 Existing Conditions............................................................................................................... 1

Section 2 Hazard Potential Evaluation ................................................................................................... 3

Section 3 Conclusions ................................................................................................................................ 4

Section 4 References................................................................................................................................... 5

Section 5 Certification................................................................................................................................ 6

List of Figures

Figure 1 Site Location Map

Figure 2 Site Overview Map

List of Appendices

Appendix A Select Engineering Drawings

Appendix B Flood Insurance Rate Map

TRC Engineers, Inc. | Dominion Virginia Power

Sludge Sedimentation Basins – Initial Periodic Hazard Potential Classification i \\NTAPA‐GRNVILLE\GVL‐VOL5\‐\WPGVL\PJT2\232002\0000\000001\R2320020000PH1‐004.DOCX 10/3/16 Final October 2016

Section 1 Background

Virginia Electric and Power Company d/b/a Dominion Virginia Power (Dominion) owns1 and

operates the Clover Power Station. The purpose of this report is to determine the hazard

potential classification (Classification) for two existing sludge sedimentation basins and the

proposed retrofit of the two basins at the Clover Power Station as required by the United States

Environmental Protection Agency’s (USEPA) final coal combustion residual (CCR) rule Title 40

Code of Federal Regulations (40 CFR) Parts 257 and 261 Subpart D‐“Standards for the Disposal

of Coal Combustion Residuals in Landfills and Surface Impoundments.” The requirements for

hazard potential classification assessments for existing and new surface impoundments are

presented in 40 CFR 257.73 and 40 CFR 257.74. The basins are considered existing surface

impoundments according to the federal rule (40 CFR 257.53).

1.1 Existing Conditions The Clover Power Station is located on the Staunton River in Halifax County, Virginia near the

Town of Clover, refer to Figure 1. There are currently two existing basins at the Clover Power

Station (North and South), which cover a total area of approximately 3.8 acres (refer to

Figure 2). The basins are located outside of the 100 year flood plain (refer to Figure 2).

The basins are located on the eastern side of the station and were constructed in partial cut with

an earthen berm constructed on the northeastern perimeter of the north basin. The maximum

depth of each basin is approximately nine feet with a bottom elevation of 365.4 feet North

American Vertical Datum of 1988 (NAVD88) based on the top of concrete and a top of berm

elevation of approximately 373 feet NAVD88. The existing storage capacity for each basin is

approximately 10.8 acre feet.

The basins provide storage for a closed loop wastewater system and the basins provide

treatment in the form of settling solids. Water levels in the basins are controlled by pumping.

The surrounding ground is approximately level with the basins on the west and south sides.

Berms were constructed with the North Basin on the north and east sides. The natural ground

beyond the basins slopes down gently to the northeast.

The basins were designed and constructed with engineered fill which was placed and

compacted to project specifications. The existing basins were constructed with 30 mil thick

Old Dominion Electric Cooperative owns a 50% undivided interest in the Clover Power Station.


Sludge Sedimentation Basins – Initial Periodic Hazard Potential Classification 1 \\NTAPA‐GRNVILLE\GVL‐VOL5\‐\WPGVL\PJT2\232002\0000\000001\R2320020000PH1‐004.DOCX 10/3/16 Final October 2016

1

Polyvinyl Chloride geomembrane liner. The geomembrane liner is protected by a one‐foot thick

sand layer, and roller compacted concrete on the floor and riprap on the sideslopes. TRC is

unable to verify that the existing liner meets the requirements of the CCR rule in 40 CFR 257.71.

Therefore, the basins are scheduled to be retrofitted with a new liner compliant with the CCR

rule, which will be completed by 2018.

The basins have been operating and performing as designed since 1995. The constructed berms

have not shown signs of weakening, poor performance, or differential settlement. The stability

of the berms was evaluated in the existing configuration and based on the design of the retrofit

with resulting factors of safety exceeding design standards. This Classification considers

potential berm failures to identify possible downstream impacts. A berm failure is highly

unlikely based on the previous performance, the design evaluations, and construction quality

assurance activities planned for the future retrofit of the basins.



Section 2 Hazard Potential Evaluation

The basins have a maximum hydraulic height of 9 feet with an estimated maximum combined

basin capacity of approximately 22 acre‐feet (maximum hydraulic height of 10.5 feet with a

capacity of 24 acre‐feet after the retrofit). Based on these characteristics, the basins do not meet

the definition of a dam or impounding structure according to the Virginia Dam Safety

Regulations (Title 4 Virginia Administrative Code 50‐20‐30).

Due to the site grading, discharge out of the basins due to a potential berm failure would flow

directly toward the Staunton River, refer to Figures 1 and 2. The figures contain arrows which

reflect the likely flow paths of the water to and from the basins. The flow path directions are

based on site topographic survey information in the immediate vicinity of the basins and

United States Geologic Survey topographic maps in areas beyond the extent of the site survey.

Based on this evaluation, there are no habitable structures currently at risk in the event of a

failure.

It is also noted that the property at risk should a failure occur is owned by Dominion (refer to

Figure 2). There is in excess of 100 acres of undeveloped property located immediately between

the basins and the Staunton River. This area would serve to significantly attenuate any peak

discharge before it entered into the river.

Based on this evaluation of the existing basins:

There is no apparent risk of loss of life associated with a potential failure of the basin berms.

There will not be interruption or impact to critical infrastructure due to a potential failure of the basin berms.

Environmental impacts will be limited to property owned and operated by Dominion.

Therefore, the existing and retrofitted sludge sedimentation basins are classified as low hazard.



Section 3 Conclusions

Based upon these evaluations, the existing and retrofitted sludge sedimentation basins at the

Clover Power Station are classified as low hazard potential surface impoundments. The

Virginia Department of Environmental Quality will be notified once this document has been

placed in the operating record and posted to the publically accessible website.

A periodic hazard potential classification assessment must be conducted every 5 years from the

completion date of this Classification.

The Classification shall be amended whenever the periodic review period is reached or if

changes in site conditions, either intentionally or unintentionally, occur that will change the

current Classification.



Section 4 References

National Flood Insurance Program. 2009. Flood Insurance Rate Map: Halifax County Virginia Panel 350 of 625. Map Number 51083C0350D. Effective Date October 16, 2009. Federal Emergency Management Agency. Washington, D.C.



Section 5 Certification

I, the undersigned Virginia Professional Engineer, hereby certify that I am familiar with the

technical requirements of 40 CFR 257 Subpart D. I also certify that it is my professional opinion

that, to the best of my knowledge, information, and belief, that the information in this

demonstration is in accordance with current good and accepted engineering practice(s) and

standard(s) and meets the requirements of paragraph (a) in 40 CFR 257.73 and 40 CFR 257.74.

For the purpose of this document, “certify” and “certification” shall be interpreted and

construed to be a “statement of professional opinion.” The certification is understood and

intended to be an expression of my professional opinion as a Virginia Licensed Professional

Engineer, based upon knowledge, information, and belief. The statement(s) of professional

opinion are not and shall not be interpreted or construed to be a guarantee or a warranty of the

analysis herein.

R. Kent Nilsson, P.E. 026477

Printed Name of Professional Engineer Commonwealth of Virginia License Number

October 3, 2016

Signature of Professional Engineer Date



C TRC

Staunton River

SITE LOCATION

VIRGINIA

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SURFACEIMPOUNDMENTS

VIRGINIA OVERVIEWLegend

DIRECTION OF SURFACEWATER FLOW EXTENTS OF 100-YEARFLOODPLAIN

-BASE MAP FROM USGS 7.5 MINUTE TOPOGRAPHIC QUADRANGLE SERIES, 1982.-FLOOD DATA ACQUIRED FROM FEMA NATIONAL FLOOD HAZARD LAYER (NFHL). 1 " = 2,000 ' 0 2,000 4,000 1:24,000 FEET

DRAWN BY: R SUEMNICHTDOMINION RESOURCES SERVICES, INC.CLOVER POWER STATION APPROVED BY: R. K. NILSSONCLOVER, HALIFAX COUNTY, VIRGINIA

PROJECT NO: 232002Patewood Plaza One, Suite 30030 Patewood Drive INITIAL HAZARD POTENTIAL CLASSIFICATION FILE NO. 232002-006slm.mxdGreenville, SC 29615Phone: 864.281.0030 SITE LOCATION MAP

DATE: AUGUST 2016

FIGURE 1

R SUEMNICHT

232002

232002-007.mxd

R. K. NILSSON

INITIAL HAZARD POTENTIAL CLASSIFICATIONSITE OVERVIEW MAP

DOMINION RESOURCES SERVICES, INC.CLOVER POWER STATION

CLOVER, HALIFAX COUNTY, VIRGINIA

FIGURE 2

APPROVED BY:

PROJECT NO:

FILE NO.

DATE:

Staunton River

0 1,500 3,000Feet

1 " = 1,500 '1:18,000

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AUGUST 2016

-BASE MAP FROM COMMONWEALTH OF VIRGINIA ORTHOPHOTOGRAPHY, 2013.-FLOOD DATA ACQUIRED FROM FEMA NATIONAL FLOOD HAZARD LAYER (NFHL).

VIRGINIA OVERVIEW

SITE LOCATION

Patewood Plaza One, Suite 30030 Patewood DriveGreenville, SC 29615Phone: 864.281.0030

TRC - GISTRC - GIS

LegendDIRECTION OF SURFACEWATER FLOWEXTENTS OF 100-YEARFLOODPLAINAPPROXIMATE PROPERTYBOUNDARY

SLUDGE SEDIMENTATIONBASINS LOCATION

C TRC


Sludge Sedimentation Basins – Initial Periodic Hazard Potential Classification

\\NTAPA‐GRNVILLE\GVL‐VOL5\‐\WPGVL\PJT2\232002\0000\000001\R2320020000PH1‐004.DOCX 10/3/16 Final October 2016

Appendix A Select Engineering Drawings

SLUDGE

SEDIMENTATION

BASINS

SITE LOCATOR 1" = 600'

R. KEKI' NILSSON

: Lie. ~Oir026477

HALIFAX COUNTY VIRGINIA

RETROFIT - SLUDGE SEDIMENTATION BASINS

ISSUED FOR BID

PREPARED FOR:

PREPARED BY:

DATE:

DOMINION RESOURCES SERVICES, INC.

CLOVER POWER STATION

CLOVER, VIRGINIA

TRC ENGINEERS, INC.

GREENVILLE, SOUTH CAROLINA

APRIL 2016

•

:

SHEET NUMBER

66706-15348-CWSG-S3100

66706-15348-CWSG-S3101

66706-15348-CWSG-S3102

66706-15348-CWSG-S3103

66706-15348-CWSG-S3104

66706-15348-CWSG-S3105

66706-15348-CWSG-S3106

66706-15348-CWSG-S3107

66706-15348-CWSG-M4000

66706-15348-CWSG-S3108

66706-15348-CWSG-S3109

66706-15348-CWSG-S3110

66706-15348-CWSG-S3111

66706-15348-CWSG-S3112

66706-15348-CWSG-S3113

66706-15348-CWSG-S3114

66706-15348-CWSG-S3115

66706-15348-CWSG-S3116

66706-15348-CWSG-S3117

66706-15348-CWSG-S3118

66706-15348-CWSG-S3119

66706-15348-CWSG-M2647

66706-15348-CWSG-M4001

66706-15348-CWSG-M4002

66706-15348-CWSG-M4003

66706-15348-CWSG-M4004

66706-15348-CWSG-M4005

66706-15348-CWSG-M4006

66706-15348-CWSG-S6200

66706-15348-CWSG-S6201

66706-15348-CWSG-S6202

66706-15348-CWSG-S6203

66706-15348-CWSG-S6204

66706-15348-CWSG-ElOOl

66706-15348-CWSG-E1002

66706-15348-CWSG-E1003

66706-15348-CWSG-E1004

66706-15348-CWSG-ElOOS

66706-15348-CWSG-E1006

66706-15348-CWSG-ElOO?

66706-15348-CWSG-E1008

SHEET INDEX

SHEET TITLE

TITLE SHEET

GENERAL NOTES- CIVIL, MECHANICAL, STRUCTURAL

GENERAL NOTES- CIVIL, MECHANICAL, STRUCTURAL

CIVIL STANDARD LEGEND

EXISTING CONDITIONS

SUGGESTED CONSTRUCTION SEQUENCE PLAN

EROSION AND SEDIMENT CONTROL PLAN

OVERVIEW NORTH AND SOUTH BASINS

YARD PIPING PROFILES

NORTH BASIN LINER SUB BASE GRADES

NORTH BASIN BASE AND PAVING

NORTH BASIN CROSS SECTIONS

SOUTH BASIN LINERSUBBASEGRADES

SOUTH BASIN BASE AND PAVING

SOUTH BASIN CROSS SECTIONS

CIVIL DETAILS - NORTH AND SOUTH BASINS

CIVIL DETAILS - NORTH AND SOUTH BASINS

CIVIL DETAILS - SOUTH BASIN

CIVIL DETAILS - SOUTH BASIN

CIVIL DETAILS

CIVIL DETAILS - EROSION AND SEDIMENT CONTROL

MECHANICAL P&ID

PUMP STATION PLAN VIEW

PUMP STATION SECTION VIEWS

FLOW SPLIT BOX PLAN AND SECTIONS

TEMPORARY PUMP STATION PLAN

MECHANICAL DETAILS 1

MECHANICAL DETAILS 2

STRUCTURAL- SLUDGE PUMP STATION

STRUCTURAL- SLUDGE PUMP STATION

STRUCTURAL - FLOW SPLIT BOX

STRUCTURAL-TYPICAL SECTIONS AND DETAILS

STRUCTURAL/ARCHITECTURAL- SECTIONS & DETAILS

ELECTRICAL SYMBOLS AND ABBREVIATIONS

ELECTRICAL SITE PLAN - DEMO

ELECTRICAL SITE PLAN - PROPOSED

ELECTRICAL ONELIN E

ELECTRICAL DETAILS AND ENLARGED PLANS

ELECTRICAL DETAILS

ELECTRICAL DETAILS AND RACEWAY SCHEDULE

CABLE AND PANEL SCHEDULE

Q TRC 30 Patewood Drive

Patewood Plaza One, Suite 300 Greenville, SC 29615 Phone: 864.281.0030

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8" HDPE OVERFLOW AND DRAIN

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8" WWW-C

8" DPB-A(x2)

8" WSG-D

3,475,900 N

3,476,200 N

11,423,600 E

11,423,700 E

11,423,800 E

11,423,900 E

11,424,000 E

11,424,100 E

11,424,200 E

11,424,300 E

3,476,000 N

3,476,100 N

11,424,400 E

3,476,600 N

11,424,500 E

3,476,300 N

3,476,400 N

3,476,500 N

11,423,500 E

EXISTING ACCESS

RAMP

EXISTING ACCESS

RAMP

EXISTING PUMP

STATION

EXISTING FLOW

SPLIT BOX

SOUTH BASIN

NORTH BASIN

EXISTING INFLUENT

PIPES

EXISTING INFLUENT

PIPES

EXISTING WATER TRUCK

LOADOUT

CONTROL POINT CAST

IN CONCRETE PAD OF

MONITORING WELL

CP-3

N 3,476,368.57

E 11,424,159.08

EL = 373.90

EXISTING ELECTRICAL

BUILDING

8" DIA. STEEL PUMP

DISCHARGE PIPE

1-8" DIA. STEEL PUMP

DISCHARGE PIPE

3-8" DIA. STEEL BASIN

INLET PIPES

#2

N 3,476,279.77

E 11,424,156.48

EL = 372.86

CP TBAR

#1

N 3,476,607.36

E 11,423,847.90

EL = 372.31

CP TBAR

40 80 120 160

SCALE IN FEET

0

1. REFER TO PLAN SHEETS 66706-15348-CWSG-S3101,S3102, AND S3103 OF

THIS PLAN SET FOR STANDARD LEGEND, GENERAL NOTES AND CONTROL

POINT LOCATIONS.

2. UNDERGROUND PIPING, ELECTRICAL, AND DUCT BANKS ARE BASED ON

DRAWINGS 1-5348-1UUU-S3302, 15348-1UUU-S3311, AND A WATERLINE

AS-BUILT DRAWING DATED MAY 3, 2012 BY JIMMY N. FAIRES, PLS.

LOCATIONS HAVE NOT BEEN FIELD VERIFIED. CONTRACTOR IS

RESPONSIBLE FOR LOCATING UTILITIES PRIOR TO CONSTRUCTION.

3. THE SOUTH BASIN WAS FULL OF WATER AND SOLIDS AT THE TIME OF THE

SURVEY. THE DESIGN GRADES FOR THE EXISTING NORTH AND SOUTH

BASINS ARE SIMILAR BASED ON DRAWING 15348-1STF-S3001 REV. 12.

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POWER GENERATION ENGINEERING RICHMOND, VIRGINIA

RETROFIT

EXISTING CONDITIONS

SLUDGE SEDIMENTATION CLOVER, VIRGINIA

BASINS

DSGN D.MARSHALL DSGN SUPV DA TE APRIL 2016 DGNSPEC FOR FILE VERIFICATION

DRWN L. STORMER ENGR SUPV

CHKD JH PROJ ENGR

DRAWING NO.

66706-15348-CWSG-S3104 REV.

0 REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M. l&C REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M. l&C REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M l&C REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M. l&C REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M. l&C DISPL

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8

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3,476,200 N

11,423,600 E

11,423,700 E

11,423,800 E

11,423,900 E

11,424,000 E

11,424,100 E

11,424,200 E

11,424,300 E

3,476,000 N

3,476,100 N

11,424,400 E

3,476,600 N

11,424,500 E

3,476,300 N

3,476,400 N

3,476,500 N

11,423,500 E

STORAGE BASIN ACCESS

RAMP

SEE DETAIL

2

S3115


RAMP

SEE DETAIL

3

S3115


RAMP

SEE DETAIL

1

S3115

BASE LINER

SEE DETAIL

1

S3114

BASE LINER

SEE DETAIL

1

S3114

4

S3114

6" DROP UNDER RAMP SLAB

SEE DETAIL

1

S3116

6" DROP

T

O

E

L

.

3

7

4

T

O

E

L

.

3

7

4

EXISTING 8" DIA. HDPE

WATER PIPE

WATER TRUCK

LOADOUT STATION

SEE DETAIL1

S3117

EXISTING 4" DIA.

HDPE WATER PIPE

STA. 0+00 VALUE VAULT FOR

CONNECTION NEW PIPE TO

EXISTING PIPE

SEE DETAIL5

M4005

6" DIA. HDPE DRAIN PIPE TO

SOUTH BASIN

SEE DETAIL

1

S3117

FLOW SPLIT BOX. SEE

SHEETS M4003, S6202.

SEE DETAIL2

S3116

STA. 3+37.32

END 3-8" HDPE

BASIN INLET PIPES

STA 2+58.59

END 6" HDPE PIPE

STA. 5+79.06

END 8" HDPE PUMP

DISCHARGE PIPE

BASIN DIVIDING BERM

SEE DETAIL

1

S3116

WARNING: EXISTING UTILITY

SEE NOTE 1

SOUTH BASIN

NORTH BASIN

LIMITS OF 8" PIPE

REPLACEMENT

0+9.00 INSTALL 4-8" 90°

BENDS

40 80 120 160

SCALE IN FEET

0

1. REFER TO PLAN SHEET S3103 OF THIS PLAN SET FOR STANDARD

LEGEND NOTES AND CONTROL POINT LOCATIONS.

5+00 STATIONING FOR PIPE PROFILES SHOWN ON PLAN SHEET M4000.

1. BURIED ELECTRICAL DUCT BANK IN DIVIDER BERM AND

NORTHWEST OF BASINS. USE CAUTION DURING EXCAVATION.

2. EXACT LOCATION OF TEMPORARY PUMP SYSTEM TO BE

CONFIRMED BY OWNER PRIOR TO CONSTRUCTION.

3. HDPE YARD PIPING SHALL BE CLASS DR-17 WITH WORKING

PRESSURE RATING OF 125 PSI. PIPE AND FITTINGS SHALL MEET

THE REQUIREMENTS OF AWWA C906 AND ASTM D2239. PIPE

SIZE NOTED INDICATES THE INSIDE DIAMETER.

4. PROVIDE THRUST BLOCKING FOR ALL BURIED PIPE BENDS AS

DESCRIBED IN DETAIL 9, SHEET M4006.

DRAW

ING

NAME

: \\nta

pa-m

adiso

n\msn

-vol2\

CADD

\PJT

\00\D

omini

on R

esou

rces\C

lover

\2320

02 -

Liner

Con

struc

tion\0

0000

4\ 23

2002

.SHT

05-S

B.dw

g ---

PLOT

DAT

E: Ju

ne 08

, 201

6 - 9:

59AM

--- L

AYOU

T: 66

706-

1534

8-CW

SG-S

3107

NAD83 CONSTRUCTION COORDINATES

TAG

OBJECT

(CENTERLINE)

NORTHING EASTING REFERENCE SHEETS

A 8" PIPE STA. 0+00 3476198.60 11423593.69 M4000

B

8" PIPE STA. 0+09.00

(90° BEND)

3476194.31 11423601.60 M4000

C

8" PIPE STA. 2+21.13

(45° BEND)

3476379.43 11423702.06 M4000

D

8" PIPE STA. 2+74.49

(45° BEND)

3476395.29 11423753.51 M4000

E 6" HDPE VALVE VAULT 3476603.70 11423838.53M4000, M4005

F FLOW SPLIT BOX 3476364.65 11423811.46M4003, S6202

G

TEMPORARY PIPE

CONNECTION

3476276.79 11423971.63 M4004

H PUMP STATION 3476249.01 11424029.00

M4001, M4002, S6200,

S6201, E1005

J TEMPORARY PUMP STATION 3476274.90 11424122.20 M4004

F

E

D

C

B

A

----

8

+

+

+ STA. 0+00 BEGIN 8" HDPE BASIN INLET PIPES & PUMP DISCHARGE PIPE. CONNECT TO EX. 8" STL. PIPING.

\_MWPW-2 TOP=JTT.87' PVC=371.10'

+

--------------

+

ASPHALT

+

+

+

STAGE VS STORAGE MATRIX

NORTH NORTH SOUTH SOUTH

BASIN BASIN BASIN BASIN

CAPACITY CAPACITY CAPACITY CAPACITY ELEVATION (GAL) (AC FT) (GAL) (AC FT)

365 14,400 0.0 14,500 0.0

366 163,400 0.5 162,800 0.5

367 532,200 1.6 527,700 1.6

368 949,200 2.9 939.600 2.9

369 1,388,800 4.3 1,373,900 4.2

370 1,851,100 5.7 1,830,900 5.6

371 2,336,600 7.2 2,310,800 7.1

372 2,845,500 8.7 2,814,000 8.6

373 3,377,800 10.4 3,340,300 10.3

374 3,930,300 12.1 3,886,500 11.9

7

ASPHALT

EXISTING ELECTRICAL . BUILDING

COMBINED

BASIN

CAPACITY

(GAL)

28,900

326,300

1,059,900

1,888,900

2,762,700

3,682,000

4,647,400

5,659,500

6,718,100

7,816,700

o./_

/

COMBINED

BASIN

CAPACITY

(AC FT)

0.1

1.0

3.3

5.8

8.5

11.3

14.3

17.4

20.6

24.0

I

\

6

STA. 5+21.08 INSTALL 8" _ _,,,., TEE FITTING. CONNECT TO

. 8" PUMP DISCHARGE PIPE

+

5

I I

I I

I I

b I

I

I I

I I

I

I I

I I

I I

I I I W /

\

I

\

4

I

I

\

I I

<'

Q ISSUED FOR BID

04 08 2016

DM LLS JNH

3

NA RKN CS

+

+

+

DS

2 1

NOTES

CJ

ADDITIONAL NOTES

+

+ R.KENTNILSSON :

: 1,.ic. No, 0264 77 :

\ ~ '-f/<o/;& ~ft/ • O,,,l' 7' 0ef • • •• 88IONAL ~'21-.,.,•

•••••••••

+ -------

IJl!r.. "3'~D • • ri//11~ om1n1on· (OTRC

POWER GENERATION ENGINEERING RICHMOND, VIRGINIA

OVERVIEW NORTH AND SOUTH BASINS

RETROFIT SLUDGE SEDIMENTATION CLOVER, VIRGINIA

BASINS

DSGN D.MARSHALL DSGN SUPV DA TE APRIL 2016 DGNSPEC FOR FILE VERIFICATION

DRWN L. STORMER ENGR SUPV

CHKD JH PROJ ENGR

DRAWING NO.

66706-15348-CWSG-S3107 REV.

0 REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M. l&C REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M. l&C REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M l&C REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M. l&C REV DATE DSGN DRWN CHKD DSGN PROJ CIVIL ELEC MECH ARCH E.M. l&C DISPL

SUPV ENGR ENGR ENGR ENGR ENGR ENGR SUPV ENGR ENGR ENGR ENGR ENGR ENGR SUPV ENGR ENGR ENGR ENGR ENGR ENGR SUPV ENGR ENGR ENGR ENGR ENGR ENGR SUPV ENGR ENGR ENGR ENGR ENGR ENGR ENGR SCALE: AS NOTED UNLESS OTHERWISE NOTED SH 8 OF 41

8 7 6 5 4 3 2 1

F

E

D

C

B

A


Sludge Sedimentation Basins – Initial Periodic Hazard Potential Classification

\\NTAPA‐GRNVILLE\GVL‐VOL5\‐\WPGVL\PJT2\232002\0000\000001\R2320020000PH1‐004.DOCX 10/3/16 Final October 2016

Appendix B Flood Insurance Rate Map

NOTES TO USERS This Map is tot use In aclmlnit !enng the N.aliOnal FIOod Insurance P10Qt't1M- 11 doe,, not ~rfy identify all erc.-s sv"bjo,c;I » flooding, pm,culldy tfQm local d111in990 ~ s d small size, The community map repo&ltory shOUld be oonalJted for J)O$&ible updated or additional flood haz.atd info,mMion.

To obt.-n more detailed imormaion 1t1 areas where Base Flood Elevations (SFEs) and/« floodways have beM dewmil"ll!!d, uws are encout.,a to O!>f\S&Al tM FIOOd PIOU-es and Floodway Oat.a and/o, $1.#1'\Maty Of $1illwat~ EICvtlt:IOnl ~ oonteined wllt!in 1he FIOOd lnMJr3nc,e Sh,1d'y (FIS) rtp)l't that ac:cotl"ll)tlmff llu FIRM U$0f$ shOuld bo 8W.N'O that 8FE, shown on lh!: FtRM reptffOM rounded wholA,-foot eleva1ions.. Theae BFEs are in'8nded for flood ln&Urance rating purposes onf'/ and ShoUld not be u&ed ea the sole source of fk>od etev-&tion lntormabOn. Aoc:c«hng!y, llood ekfflllion data presented In the FIS re,pott shOufd- be uli!izecl 1n oon;uncaion with the FIRM tot pul'l)O$es oc oonstt\Jdion MdJol Roodplain maMgemenl Coastal Base Rood Elevauons ah<M'l'I on uwa m&J> apply only land'Mlltd of o .o root Nctlh Ameiice,n VelttQII oa:um o r 1988 (NAVO 88) users ot fl4 FIRM &ho.lid be aware th.rt coastal llood elsvadona are also provi:led In lhe Su!M\ar'f of StilM'a!er Be,,.,a~Otll$ tables WI the Flood lnw anoe Scooy repc,t k>f lhis j,n&ddion ElovadolllS shown in lhet Svmm11,y ol SD.lwet(lr Be,.,a1i0tl$ ~ blot 11houtt bo us«i kif constrvc-10n a~a floodplain management purposes when lhef a,e higher ll'en lh&eJevations sb:>wn on lhiS FIRM

Bol.l'ld•iff of ~ ftoodway, weto COIYIJMod at Q"0$5 .eeti~ .ind interpol81od b«M+n cross &eaions The fbodway, were ba5ed on h)'dral.fk con.sderations 'Wilh regard to ,eq~remeni:s Of the Na!lenal Rood lnsuranoe Pro0ram Fk>OO#ay WN:flhs ,nd ofler p1ttfntnt IIO(ldway d•I• ,re p,ovidtd h tht Flood ln141rfnce Swdy rep,,11 IOr ttis jurisdcton.

cen.11.n areas n~ In Special FtH>d Ha.;a,d Ate.as nuy b6 p«:tected by flood control structures. Refer to Sectlon 2.<11 "Flood Protecticn Measures- of the Flood Insurance Sludy ,epoi, tor lmormrion on flood control S'ln.ct\ns fa Chis jtrisdic:Oon

n c profKtlon u&ed In tho l)«lparalion of tti, map was Vif'gnia Sta\9 Plane Soulh tone. The hol'i tontal datum was NAO 8 3. GRS80 sph«dd. Dinerences In dillum. ~~. i;roiodion Of Sli!;o ~nit z:on0$ wod in Iii• prod~on oi FIRM& tor edpcert jt.risdictions may resua In Slig\t po-silional dfte,ences in map feature& aeross jurlS:d~on bol.l'ld.aties. These dfferenoes do net •tect the a:~ of lhfs FIRM

Flood elewraons on tt» map are rel8tef'IOed to thlt NOl'1h Amencen V~ Oa1um or 1986. These IO<>d elevalliMt tnut1 be compared 10 ,uueture and gt0und elevations referenood to the &8ffl8 vertical datum. F« lnformatkrl ,egarding COfl\lfHSIOft be~een ine NatiOOaJ GeodOe verllcal OalUm or 1929 and the NM!h Amerlc•.n Verlie• ! O•tum of 1988. vilit !he Nat.onal Geodetic $utvey w1b111e a l bUa:lbmw.021 non goy or contact the NatiOflal Geodedc Surv.y at the followh~ adctesc

NGS 11'110tffll(i0n SeMces NOAA. N"~S1 2 NatiooalCeodetie Survey SSMC-3. #9202 131SEast-We-stHlgtww"itf SilYerSpnng, Matyleftd 20910-3282 (301)71).3242

Io oblllli'I cw~nl eteva-«i. detetipool\ •t1&'0t loc•:ion l"lfortnation fOr bonch mark& &hown on lhi& rrep, ptoaso wl'l&ilct lho tlbrmation Setvices 8r9nch of the Na1iONI Geode1rc Sl.l'V9Y al (300 713-32'2, or 'Aslt itS 'M!lbsae at Motfwwt.o nouioaa m S.e map lfformaion MIOwn on this FIRM was ? <Mdod in d~t.111 rormai ~ tho CO'M'lonweelih d Vrgllia. lhro1.4gl\ the Vl,vl'lia Geogra~ic "'-twork D~u:,n rt II.& Otparf.mtnt Of T tehl'ldogy PI.IM ing (VGIN). TheM &ta we,e ptOduC6d ... sedet or l :2,400 and t·4.800 rrom one-loot and 1wi>k>o1 resoll.tdon cf.;gltal ont'olmagery nownin Spritig 2002

His m,,p reflect$ more cle~td -.nO \IP•to-<I01e st,9am channel configuration& than 1M&e shown on the PftMOUi FIRM for Uis f',W1sdi::lion The flOodpla'n& aid lloodways 1hat v,,,ere ttan.sf«red ttom the pcevlous FIRM may have been ad)Jsted to eortam IO It~ new 11,eom Ch#lnd c:orlt9J tt110t11. As a rt.suit. N Rcod Profiles ard Floodway Data table:S In lhe Fklod tnsu-anoe Stucty Repol1 {Wl'leh COltai/\s -.Jltl<>t\tall-..e hyd<ai11e dala) may retied strMm ehaM.el d istance, that dlfer from v.h«fl1 $how'n0t1 thismap.

Corporate llmlts ShoWn °' !his map ate based on lhe best d•• avalable a t the lime d p.itti~,cn. Seeause Changes due 10 8f'lneia1rons or ~anneutens may havo o:::eLr'At<t ancr tti• maip wa ptA>tilhcd. ma,p uws sho"d cone.ct tll)l)fOpiltc oo,mn,yn,1yo1n01a[s rovetlfy curff!nt oorpon1e limlt IOca,ons.

Plono teltr 10 U'!o upw'1oly SKln10d M,p 1ndu fo1 M <1,fOMiew mop of the COIJl'fly at1owl1191hS layout d map pend•: communiy map reposi10ry edd·resst11: and a Usor,g or Communlles tabfe c.ot1a\ollro N•lonal Flood lnswMoe Program d:aies 10( each COMMuniy • wen os a !!sting of lh6 ponels on 'Afl1eh 6'Ch commurityisloccr:ect.

ContilCI fie FEMA M;11> Ser,1lce Center al 1·80!>35&.M18 for mforlN'llcn on eval able p-oducts as&OCiMed wlh His FIRM. Available pcoellCls may fndooe prevloust, Issued Leeers d Map Change, a Rood lnsLnnce Swdy report, and/of digrtol "o,sions of tl\is map, 111,e FEMA Mop SOl'Yico Conlor moy •'!so bo rt.ached by Fax a1 1-800-358-9620 end iu web$ te ei htlPtfmsc(g;na goy

If )'OU have questi ons about thiS map orqueshoM conoemng the NaliCM'Ull Flood Insurance Program in 90nor.al. pk:e$0 eall 1477-F EMA MAP (1-817-336-2$27) or 'AU the FEMA website at tttp1lwwwJ«na.gov,'businessfntp.

UMIT Of STVOV

114 t5000FT 11420000 FT

UWTOm,ov

11.-3sooon 1t440000 FT 11445000 FT11"lTXI"' 36'5t30'

. .,.,-,,

.., ......

---------+-----cl.,,-..

..,,-,.

- LEGEND SPEOAL FLOCX> HA2.AAD MEAS SUBJECT TO INUNDATION BY THE 1~ ANNUAi.. ~NCE FlOOO

The l"~llood(lOO-~IIOod).fbomr,,,,tlffWoars,enooo, iltnenooelt::"«I'..-~ l" dw-ctdt,elnpeciAlcdot~IJl#llt(91'C".,_. l'he$c,«lllflaxlHR.trdN'OfJl$t.he ~Sl.,OjC(tto~~tr'el'tltMJlli01¥U:lll:Xld, NUll~d~FIOoo"Wl'O~ lO"IISA.~Ni,J,IJ.M,~.Y,erc!\ft. ThellneFlo:ldEIIMitk'n l$thl:wai#~ *'400tldNl,._lfWWcn.,raftood,

'""'' ZONE_,

, .......

ZON!A9t

NO~flQocl~oetetNneel

i.e f.OOd ~ ~

A:ioc!dqlhst:/ l10 J fc:s(IISUllrartm rl~):-- Aood --Fb:xl..,_dl/JDlt«l(USUlllt'ltlettflcMon~ttrnh)....-,pe ~~ klt.ns5 d~fal'lllocdn!L¥d0dtlaal!ro -~floooH&.tMIJr,ee~y«ct«UldflMIIM l 'ltownualCIMr:t IIOodO,•lbocl<.one,-olsYSte'ANW41f~ornN"teO, lew'leAA. lnOGl.e!Ntlhel'clrr.:iel-l'looclCD'VOISY$11nlS~~eop-or,tdc ~r'O(n1titl~.-viualct1¥'<1eorQrNUtflOOO,

M* robe~ tiom 11' aTUII own~ ty<1 ,~ail fioocl ~ $IJU'l'I ...- ~: IIO 8lise' nood ~ -Zc:»£V COiNalflOoo.lO'llwCfl~l'IM.-o(_,,..,aion):t'O~Roocl --to,«Vt. t.otD r«x1 IO'le ~ 'ldl:orr ~ <~ «uonl\: ea RXxl --- FLO<X>VIAY AAEJ,,S TN zooe ~

The~ISNtNN'dd•~d'.isfl"tlll:ljt(lel'(~..,_N.IIIUStbe-t.roe d~,ott'Metrlti.snnulllc.NlnO:flccdc.antccamcdwtno1.t~n:,ecr...s

,, __ 1:::::::::::1 OTHEltflOOO.AAEAS

Z.ONEX NtMC/0.21i~<l'tl"O!:IIOoct.,_dl,._.~CNnOtftXIO"""" ¥<'t'a\1C <1ei,tn$ or ffl tllfl' 1 rooc Qt w!VI <1r,1flrif9C .,,e.1$ ,CH cn.,n l~Ne:W•lflKP:ct«ttidC,,itoeesfieMl%•1'11"1Jil1CNt1Cetlooc,

[=i OTl<ERAREAS

~)( MlilfJ~IObeM."Slcll!l!le0.2'~CIWQ~

Z.OM;O MM$1n¥ltliellt'Oocl~Jn~t:Ml)OW()le.

~ OOASrAI. BAARIER RESOURCISSYSIDI (CllltS) AREAS

~ OniERWJSE PROTI:CTEO AREAS (OPA$:)

Cl!AS__,N~a!lrorl\lilll'vtoQila;l'/lllltl,nor~toso«lflfbXIH,.wcl..,__

C

0-------------0 ®-------@ 87'07'45", 32'22'30"

600000FT

'"arnJlld\WefloodpldillbCUW'»y

G.2'1.arn..mlctwutloodpialrlbeu'dery ---D-CBASll'O(S>A~

~<1M:Sng$c:«WAooclHat.rd...,..Ztwloancl bellr-Ql'(dMdA) Sc>«:lalfb>O Htatd N1!11/1$ddfr~&st A::m~ ft)Od~orlloodveklolle5.

llesefl0od8Mtl#I W.wlll~....,, ~feer &isocfml~---~,l,ffO'l!IWCll&'lmng;crt:-',)l,)On ., ..... __ .., _.., ~ ~ ref'lfffUC ~ ll'le ~ ~ ~ct1'J8J(,<A083).~~

~~T,~Meratofg,lcl~io.,e

" 50CCH00t9"icltlcJcs:~Sblte~ooorONlrffllff'I, SOIN\~(F1JtSZONf~502).~Q:rlof!N!<OtllC~

letol~(-~1t11'Qesc10US81~dM FIIIMl)oll'ICf)

""'""' WJ>RCP0$1TOftV

RtwlOl~dMai>RepotllfonNoitM.ipltldtl!

EJFE-C~Qit.ftOFCOt,INTYMl)6 FlOOOIMSIJRA~U RATE NAP

OOCblf lS, zoot

For~ ~P~ nl$l.cfy oriDt to~ rmil)J)lng. ,etertothlCcnmunitV Ni9*°'Y~tocbUOrl~FIOodWU"tl!'IO!!ili,dr~fOrN).lnSd.alOI\.

To ~new IIOod ~ '5 1Yalable., l'IIS ~,. OCIUct "°"' ~ a"Jll"llOTCIIChcKIOCINIF"-'odll'GU'nitftoglna t..a0G-6l8'6610.

MAP SCALE r • 2000'

1000 1000 4000 ... , METERS

PANEL 03500

RATE MAP

A"D 1:-iCORPORATEO ARr ... , s

~ ~ ~ _,,,~ .. WW

MAP NUMBER 51083C0350D

EFFECTIVE DATE OCTOBER 16, 2009

sludge sedimentation basins initial periodic hazard

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