PINEY POINT WATER MANAGEMENT TOWARDS CLOSURE

FDEP

byNadim F. Fuleihan, Sc.D., P.E.

Ardaman & AssociatesGeotechnical, Environmental andMaterials Consultants

Agency on Bay Management

WATER MANAGEMENT CHALLENGE

600 MGal +Ponded Process Water

• 600 MGal of Ponded Process Water

• 160 MGal Added Each Year (Assuming Normal Rainfall)

160 MGal/yr Net Addition

600 MGal + Drainable Pore Water

• 600 MGal of Drainable Pore Water

• Extra 12.5 MGal Added for Each Inch of Rain Above Normal

AVAILABLE SURGE STORAGE CAPACITYA

VA

ILA

BLE

SU

RG

E C

AP

AC

ITY

(A

CR

E-F

EE

T)

0

200

400

600

800

1000

1200

1400

1600

F M A M J J A S O N2002

D J2003

F M A M JJ M A M J J A S O N D2001

J A S O N DF J

MEASURED

SURGE STORAGE CAPACITY

11.4

-IN

CH

ST

OR

M

EMERGENCYSURGE STORAGE

CAPACITY

BEGIN DISCOUNTING NGS-N STORAGE CAPACITY

W/OUT DISCOUNTING NGS-N

37.8" Rain

32.7" Rain

23.6" Rain

WATER CONSUMPTION

WATER INPUTS/OUTPUTSTWELVE MONTH PERIOD ENDING OCTOBER 31, 2003

Eva

po

rati

on

(39

7 M

gal

)Transfer To Hillsborough (2 Mgal)

Transfer To Tampa (25 Mgal)

Transfer To CFI (25 Mgal)

Transfer To Cargill (22 Mgal)

R.O Permeate (147 M

gal)

Transfer To Manatee (4 Mgal)

Spray Evaporation (10 Mgal)

Downward Seepage (28 Mgal)

Well Water Input (47 Mgal)

Excess Rainfall (284 Mgal)

Lateral Seepage (82 Mgal)

Normal Rainfall (666 Mgal)

Stack Settlement (30 Mgal)

Stack Dewatering and Other Gains (60Mgal)

Evapo

trans

pira

tion

(173

Mga

l)

Ocean Dispersion (153 Mgal)

Transfer To FP&L (1 Mgal)

Treated and Discharged (299 Mgal)

Treated on Site (12 Mgal)

NET OUTPUT = 128 MGalFREE WATER RETAINED WITH TREATMENT SLUDGES = 61 MGal

FREE WATER INVENTORY = 470 MGal

WATER INPUT/OUTPUTTWELVE MONTH PERIOD ENDING OCTOBER 31, 2003

0

200

400

600

800

1,000

1,200

1,400

1 2

MG

al

Other Inputs

Excess Rainfall

Normal Rainfall Evaporation

Treat & Transfer

Treat & Discharge

Ocean Dispersion

R.O Permeate

Outputs = 1,296 MgalInputs = 1,168 Mgal

Net Output = 128 Mgal

WATER INPUTS/OUTPUTSCALENDAR YEAR 2003 THROUGH NOVEMBER 30

Evaporation (377 Mgal)

Transfer To Hillsborough (2 Mgal)

Transfer To Tampa (30 Mgal)

Transfer To Cargill (18 Mgal)

R.O Permeate (143 Mgal)

Transfer To Manatee (1 Mgal)

Spray Evaporation (8 Mgal)

Downward Seepage (25 Mgal)

Well Water Input (48 Mgal)

Excess Rainfall (76 Mgal)

Lateral Seepage (77 Mgal)

Normal Rainfall (639 Mgal)

Stack Settlement (27 Mgal)

Stack Dewatering and Other Gains (45 Mgal)

Eva

po

tran

spir

atio

n (

165

Mg

al)

Ocean Dispersion (248 Mgal)

Treated and Discharged (299 Mgal)

NET OUTPUT = 404 MGalFREE WATER RETAINED WITH TREATMENT SLUDGES = 71 MGal

FREE WATER INVENTORY = 344 MGal

WATER INPUT/OUTPUTCALENDAR YEAR 2003 THROUGH NOVEMBER 30

0

200

400

600

800

1,000

1,200

1,400

1 2

MG

al

Other Inputs

Excess Rainfall

Normal Rainfall Evaporation

Treat & Transfer

Treat & Discharge

Ocean Dispersion

R.O Permeate

Outputs = 1,316 MgalInputs = 912 Mgal

Net Output = 404 Mgal

PINEY POINT GYPSUM STACK CLOSURE

NEW GYPSUM STACK-NORTH

(NGS-N)

NEW GYPSUM STACK-SOUTH

(NGS-S)OLD GYPSUM

STACK-NORTH(OGS-N)

OLD GYPSUM STACK-SOUTH

(OGS-S)

NORTH COOLING POND OR DAP

POND(NCP)

SOUTH COOLING POND NORTH

COMPARTMENT(SCP-N)

SOUTH COOLING POND SOUTH

COMPARTMENT(SCP-S)

EXISTING CONDITIONS

1. Top Gradient Cover

2. Slope Cover

Amended Gypsum

Soil Cover40-mil HDPE

GYPSUM

GYPSUM

1.02.5

CONVENTIONAL GYPSUM STACK CLOSURE

1. Interim Use - Process Water Storage

2. Long Term Use – Fresh Water Reservoir

80-mil HDPE

Process Water

80-mil HDPE

Soil CoverFresh Water

ALTERNATIVE CLOSURE - LINED RESERVOIR

NORTH-SOUTH CROSS SECTION

OLD GYPSUM STACK-NORTH

(OGS-N)

NEW GYPSUM STACK-NORTH

(NGS-N)

AVAILABLE STORAGE

125 MGal

SEEPAGE COLLECTION

DITCH

LINED STORAGE

270 MGalRAISED DIKES

HDPE LINER

RELIEF DITCH

NGS-N CLOSURE PLAN

GYPSUM

SEEPAGE COLLECTION DITCH

RUNOFF

HDPE LINER

HDPE LINER

COLLECTOR PIPE

GRAVEL DRAIN

GEOTEXTILE

ULTIMATE CLOSURE OF SEEPAGE COLLECTION DITCH

BERMUDA GRASS

PINEY POINT GYPSUM STACK CLOSURE

NEW GYPSUM STACK-NORTH

(NGS-N)

OLD GYPSUM STACK-NORTH

(OGS-N)

OLD GYPSUM STACK-SOUTH

(OGS-S)

NORTH COOLING POND OR DAP

POND(NCP)

SOUTH COOLING POND NORTH

COMPARTMENT(SCP-N)

SOUTH COOLING POND SOUTH

COMPARTMENT(SCP-S)

NEW GYPSUM STACK-SOUTH

(NGS-S)

CLOSURE STAGE 1NOVEMBER 2003

DEWATER NEW GYPSUM STACK-NORTH (NGS-N)

STORAGE CAPACITY IN STACK COMPARTMENTS

Current Capacity, MGal

NGS-N 125 270 + 145

CompartmentLined Reservoir

Capacity, MGalGained

Storage, MGal

OGS-S 110 155 + 45

SUBTOTAL 380 665 + 285

OGS-N 145 240 + 95

NGS-S (OPTIONAL) 300 670 + 370

TOTAL 680 1,335 + 655

DECEMBER 3.0 MGD

JANUARY 2.5 MGD

FEBRUARY/APRIL 1.5 MGD

MAY – AND BEYOND ≤1.0 MGD

RECOMMENDED CONSUMPTION(DUAL RESERVOIR OGS CLOSURE OPTION)

PROJECTED SURGE STORAGE CAPACITY WITH NORMAL RAINFALL

AV

AIL

AB

LE S

UR

GE

CA

PA

CIT

Y (

AC

RE

-FE

ET

)

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

10

0-Y

EA

R S

TO

RM

(11

.4-i

nch

ra

infa

ll)

J M2003

A M J J AF

RECOMMENDED CONSUMPTION (MGD)

S O N D J M2004

A M J J AF S

1.02.53.0

DISCOUNT NGS-N STORAGE CAPACITY

MEASURED

PREDICTED

1.5

LINED OGS-SRESERVOIR AVAILABLE

LINED OGS-NRESERVOIR AVAILABLE

DISCOUNT OGS-SSTORAGE CAPACITY

DISCOUNT OGS-NSTORAGE CAPACITY

LINED NGS-N RESERVOIR AVAILABLE

PROJECTED WATER INVENTORY WITH NORMAL RAINFALL

WA

TE

R IN

VE

NT

OT

Y (

AC

RE

-FE

ET

)

0

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

2600

WA

TE

R IN

VE

NT

OR

Y (

MG

al)

0

100

200

300

400

500

600

700

800

J M2003

A M J J AF S O N D J M2004

A M J J AF S

MEASURED

PREDICTED

RECOMMENDED CONSUMPTION (MGD)

1.02.53.0 1.5

LINED OGS-SRESERVOIR AVAILABLE

(155 MGal)

LINED OGS-NRESERVOIR AVAILABLE

(240 MGal)

LINED NGS-N RESERVOIR AVAILABLE

(270 MGal)

CONSUMPTION OUTLETS

CONSUMPTION MAKE-UP BY MONTH

PINEY POINT GYPSUM STACK CLOSURE

NEW GYPSUM STACK-NORTH

(NGS-N)

NEW GYPSUM STACK-SOUTH

(NGS-S)OLD GYPSUM STACK-NORTH

(OGS-N)

OLD GYPSUM STACK-SOUTH

(OGS-S)

NORTH COOLING POND OR DAP

POND(NCP)

SOUTH COOLING POND NORTH

COMPARTMENT(SCP-N)

SOUTH COOLING POND SOUTH

COMPARTMENT(SCP-S)

PROJECTED CLOSURE SCHEDULE

2004MAY 2004

20052004/2005

2004

2006

2005

2005

2006

2006

NEW GYPSUM STACK-NORTH

(NGS-N)

NORTH COOLING POND OR DAP

POND(NCP)

PINEY POINT GYPSUM STACK CLOSURE

SOUTH COOLING POND (SCP)

CLOSED SYSTEM CIRCA CY2006

OLD GYPSUM STACK-NORTH

(OGS-N)

OLD GYPSUM STACK-SOUTH

(OGS-S)

ALTERNATIVE WITH FRESH WATER

RESERVOIR

NEW GYPSUM STACK-SOUTH

(NGS-S)