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 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)
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