Updated Master Plan for Water Recycling Centers 2 Historic sewerage systems 1901: Mitchell Lake...

Updated Master Updated Master pPlan for Water Recycling Centers

pPlan for Water Recycling CentersRecycling CentersRecycling Centers

June 30, 2010June 30, 2010June 30, 2010June 30, 2010

Steve ClouseChief Operating Officer

Historic sewerage systems1901: Mitchell Lake1901: Mitchell Lake

1933: Rilling Road1933: Rilling Road

1894 collection system

June 30, 2010

Updated Master Plan for Water Recycling CentersUpdated Master Plan for Water Recycling Centers

I-10

Medio Creek WRC

Dos Rios WRC

Leon Creek WRCMajor andMinor I 10

LeonCreek

SaladoCreek

HelotesCreek

Dos Rios WRCMinorFacilities of the 1990s

Salado Creek WRC

OlmosCreek

410

1604Major FacilitiesMajor Facilities

LLD RiD Ri

SA Ranch

410

MedioCreek

MedioMedioSaladoSalado

LeonLeonDos RiosDos RiosCulebra

NSISD

90CalaverasLake

Medio Creek WRCMinor FacilitiesMinor Facilities

MedinaRiver

BraunigLake

Mitchell Lake

Leon Creek WRCSalado Creek WRC

SSISDSSISDNSISDNSISD

SA RanchSA RanchCulebraCulebra

SS SJune 30, 2010

Updated Master Plan for Water Recycling CentersUpdated Master Plan for Water Recycling Centers 37

San AntonioRiver

1604

Dos Rios WRC

N0

MILES

5 10

SSISD

I-10

FacilityConsolidations

Medio Creek WRC

Dos Rios WRC

Leon Creek WRC

I 10

LeonCreek

SaladoCreek

HelotesCreek

Consolidationsand

Eliminations

Dos Rios WRC

Salado Creek WRC

OlmosCreek

410

1604• All minor facilities eliminated

• Salado/Dos Rios

SA Ranch

410

MedioCreek

Salado/Dos Rios sewersheds consolidated and Salado facility eliminated

Culebra

NSISD

90CalaverasLake

Medio Creek WRCSalado transfer lineSalado transfer line

eliminated

• Biosolids transfers from Medio/Leon consolidate all

MedinaRiver

BraunigLake

Mitchell Lake

Leon Creek WRC

SS S

Salado Creek WRC

solids processing at Dos Rios

June 30, 2010


San AntonioRiver

1604

N0

MILES

5 10

Dos Rios WRCSSISD

I-10Future

Medio Creek WRC

Dos Rios WRC

Leon Creek WRC

I 10

LeonCreek

SaladoCreek

HelotesCreek

FutureService Areas

Dos Rios WRC

OlmosCreek

410

1604

410

MedioCreek

90CalaverasLake

Area to be added by

MRSO

Project includes diversion of some flow

from Leon service MedinaRiver

BraunigLake

Mitchell Lake

MRSO area to Dos Rios

June 30, 2010


San AntonioRiver

1604

N0

MILES

5 10

SAWS' Total Effluent Volumes

250,000Effluent Volumes by Year, 1935 - 2009

200,000

,

acre

100,000

150,000acrefeet

0

50,000

35 40 45 50 55 60 65 70 75 80 85 90 95 00 05

193

194

194

195

195

196

196

197

197

198

198

199

199

200

200

June 30, 2010


How far can conservation take us?

7,000,000 225

5,000,000

6,000,000

150

175

200

3,000,000

4,000,000

100

125

150watercustomer

population

1,000,000

2,000,00050

75

projected water customers

0

1,000,000

1980 1985 1990 1995 2000 2005 2010 2015 2020 20250

25water customers

projected water customers(2.5% growth rate)

June 30, 2010



7,000,000 225

gpcd

5,000,000

6,000,000

150

175

200

actual gpcd

3,000,000

4,000,000

100

125

150watercustomer

population

1,000,000

2,000,00050

75


0

1,000,000

1980 1985 1990 1995 2000 2005 2010 2015 2020 20250

25water customers


June 30, 2010



7,000,000 225

gpcd

5,000,000

6,000,000

150

175

200

actual gpcdgpcd decline to

116 in 2016

3,000,000

4,000,000

100

125

150watercustomer

population

1,000,000

2,000,00050

75


0

1,000,000

1980 1985 1990 1995 2000 2005 2010 2015 2020 20250

25water customers


June 30, 2010



7,000,000 225

gpcd

5,000,000

6,000,000

150

175

200


116 in 2016

3,000,000

4,000,000

100

125

150

116

watercustomer

population

1,000,000

2,000,00050

75


0

1,000,000

1980 1985 1990 1995 2000 2005 2010 2015 2020 20250

25water customers


June 30, 2010



7,000,000 225

gpcd

5,000,000

6,000,000

150

175

200


116 in 2016

3,000,000

4,000,000

100

125

150

110

116

watercustomer

population

1,000,000

2,000,000

25

50

75


01980 1985 1990 1995 2000 2005 2010 2015 2020 2025

0

25water customers


June 30, 2010



7,000,000 225

gpcd

5,000,000

6,000,000

150

175

200


116 in 2016

3,000,000

4,000,000

100

125

150

“no WW growth"

116

92110

watercustomer

population

1,000,000

2,000,000

25

50

75


ggpcd

92

01980 1985 1990 1995 2000 2005 2010 2015 2020 2025

0

25water customers


June 30, 2010


WRC Capacities and Flows (mgd)2007 - 2009

120

140permit limit (125)

100

60

80milliongallonsper day

permit limit (46)

20

403 year

average3 year

average

81.4 81.4 3 yearaverage3 year

average

permit limit (46)

permit limit (16)

0

20

Medio Creek Leon Creek Dos Rios

averageaverage

36.636.6

p ( )

6.46.4

June 30, 2010



120

140

permit limit (125)

100 Planning required 93.75

60


permit limit (46)

20

403 year

average3 year

average


average

permit limit (46)

permit limit (16)

Planning required

Pl i

34.5

0

20


averageaverage

36.636.6

p ( )

6.46.4

Planningrequired 12

June 30, 2010



120


t ti i d 112.5

100

construction required 112.5

60


permit limit (46)

20

403 year

average3 year

average


average

permit limit (46)

permit limit (16)

construction required

t ti

41.4

0

20


averageaverage

36.636.6

p ( )

6.46.4

constructionrequired 14.4

June 30, 2010


WRC Capacities and Flows (mgd)October 2009 thru March 2010

120


construction required 112.5

100


60


permit limit (46)

20

40

87.46 87.46

permit limit (46)

permit limit (16)


t ti

41.4

0

20


39.3939.39

p ( )

7.67.6

constructionrequired 14.4

June 30, 2010


WRC Capacities and Flows2016 - With 20 mgd transferred to Dos Rios

120


g

100 transferred from Leonand MRSO

transferred from Leonand MRSO

60

80

107107

milliongallonsper day

permit limit (46)

flowstransferred to Dos Rios

20

40107 107 permit limit (46)

permit limit (16)

0

20


3030p ( )

5.65.6

June 30, 2010


Why add to Dos Rios service area?

• Provides capacity for future flows from the new Medina River sewershednew Medina River sewershed

• Eliminates current need for expansion at Leon Creek WRCLeon Creek WRC

• Defers need for planned future expansion at Medio Creek WRCat Medio Creek WRC

• Lowest cost option

June 30, 2010


Goals for Dos Rios WRC Re-rating

• Maximize use of existing plant capacity• Provide additional capacity when• Provide additional capacity when

needed• Be prepared for peak wet weather• Be prepared for peak wet-weather

events• Minimize rate impacts through• Minimize rate impacts through

sequencing re-rating projects

June 30, 2010


Dos Rios WRC Average Flows

Flows

• At 124 gallons per person per day, permit capacity reached in 2023• At 116 gallons per person per day, permit capacity reached in 2028

140

160

Flows(mgd)

124 gpcd

100

120Permit capacity

110 gpcd116 gpcd

gp

60

80Actual

Increase due to Leon and Medio diversions

0

20

40

June 30, 2010


01988 1993 1998 2003 2008 2013 2018 2023 2028

Dos Rios WRC Re-rating Timeline• Dos Rios WRC “re-rating" is a series of phased improvements• Will result in 217 mgd capacity at Dos Rios• Will also address some deficiencies in current infrastructureWill also address some deficiencies in current infrastructure• Total cost $163 million: includes design and construction (in 2010 dollars)

design construction

June 30, 2010


Comparative Costs for Recent Wastewater Treatment Plant Projects (in 2010 dollars)Treatment Plant Projects (in 2010 dollars)

$16 00

$ / gallonof capacity

$12.00

$14.00

$16.00

$14.29

$6.00

$8.00

$10.00

$6 44

$0 00

$2.00

$4.00 $4.32$3.75

$1.77 $2.39

$4.33

$6.44

$0.00Dos RiosWRC Re-

rating

South AustinRegional Re-

rating

Medio CreekWRC

Expansion

North TexasMunicipal

WaterDistrict

San AntonioRiver

Authority

City ofCorpusChristi

City ofBoerne

June 30, 2010


Other Improvements at Dos Rios

design constructionunder construction

• Total cost: $61,034,600 (in 2010 dollars)

PROJECT 2011 20122010 20152013

$6,134,000

$14 12 600

2014

SLUDGE THICKENING AND AERATION SYSTEM IMPROVEMENTS

$10,272,000

$14,125,600

$8,691,000

TERTIARY FILTERS PHASE I

DIGESTER IMPROVEMENTS AND MIXING SYSTEM ENHANCEMENTS - PHASE I

DIGESTER IMPROVEMENTS AND MIXING SYSTEM ENHANCEMENTS - PHASE II

$12,646,000

$1 462 000

$7,704,000

DEWATERING FACILITY IMPROVEMENTS

DIGESTER IMPROVEMENTS AND MIXING SYSTEM ENHANCEMENTS - PHASE III

SYSTEM ENHANCEMENTS PHASE II

$1,462,000SCADA UPGRADE

June 30, 2010


Dos Rios WRC Re-rating

separate existingseparate existing

•separate existing Stages 1 and 2 to operate in parallel

separate existing Stages 1 and 2 to operate in parallel

June 30, 2010


Treatment in the 1980sThat was thenThat was then.....

Nov 17, 1983

Nov 10, 1983

June 30, 2010

Updated Master Plan for Water Recycling CentersUpdated Master Plan for Water Recycling CentersNov 17, 1983

Wastewater Treatment TodayThis is nowThis is now....

mexican stoneroller longear perch logperch

SA Express-NewsJune 13 2002

"Best in Texas" "Best in Nation" Permit ComplianceEnvironmentalStewardship

June 13, 2002

June 30, 2010


Conclusions and Recommendations

• Conservation will not continue to limit wastewater flow growth• Dos Rios WRC is upgradable and has available biological capacity• Proceed with Dos Rios WRC re-rating, headworks improvements

and process enhancements project as planned• Leon Creek capacity achieved by transferring flow to MRSO and

D RiDos Rios• Delay future Medio Creek expansions with flow transfers to Dos

RiosC ti ll l t th i fl i ll th h d d• Continually re-evaluate growth in flows in all three sewersheds and adjust Dos Rios WRC re-rating schedule as needed

June 30, 2010


Updated Master Updated Master pPlan for Water Recycling Centers

pPlan for Water Recycling CentersRecycling CentersRecycling Centers

June 30, 2010June 30, 2010June 30, 2010June 30, 2010

Steve ClouseChief Operating Officer

Updated Master Plan for Water Recycling Centers 2 Historic sewerage systems 1901: Mitchell Lake...

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