E.W. Blom Point Loma Wastewater Treatment Plant

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• City of Chula Vista• City of Coronado• City of Del Mar• City of El Cajon• City of Imperial Beach• City of La Mesa• City of National City• City of Poway• Otay Water District• Padre Dam MWD• Lemon Grove SD• San Diego County

301(h) Waiver199520022010

301(h) Waiver Process

NPDES Reissuance Process

Oct 28, 2016: Public Notice/Tentative Documents

Dec 14, 2016: Joint Public Hearing

Dec 21, 2016: Comments Due on Tentative Documents

Written Comments –October 28 through December 21:

1. City of San Diego2. Lemon Grove Sanitation District3. City of Coronado4. Otay Water District5. Surfrider Foundation6. City of Chula Vista7. Metro Wastewater Joint Powers Authority

Oral Comments -December 2016 meeting:

1. City of San Diego2. Lemon Grove Sanitation District3. City of La Mesa4. San Diego Coastkeeper5. Coastal Environmental Rights Foundation

Schedule for the Pure Water San Diego program

City’s original schedule 1. City of Coronado2. Otay Water District3. City of Chula Vista4. Metro Wastewater Joint

Powers AuthorityCity’s accelerated schedule

1. Surfrider Foundation2. San Diego Coastkeeper3. Coastal Environmental

Rights Foundation

Schedule for the Pure Water San Diego program

City’s original schedule Cumulative Rates• 15 MGD by 2023• 30 MGD by 2027• 83 MGD by 2035

City’s accelerated schedule Cumulative Rates• 30 MGD by 2022• 83 MGD by 2035

February 10, 2017: Public Notice/Revised Tentative Order

February 24, 2017: Comments Due onrevised schedule

Schedule for the Pure Water San Diego program

Object toaccelerated schedule

1. City of San Diego2. City of Chula Vista3. City of Poway4. City of El Cajon5. Lemon Grove Sanitation District6. Metro Wastewater Joint Powers

Authority7. Padre Dam Municipal Water

District

Support accelerated schedule

1. San Diego Coastkeeper2. Coastal Environmental Rights

Foundation

Metropolitan Sewerage SystemOwner City of San Diego

Participating Agencies 1. City of Chula Vista2. City of Coronado3. City of Del Mar4. City of El Cajon5. City of Imperial Beach6. City of La Mesa7. City of National City8. City of Poway9. Otay Water District10. Padre Dam Municipal Water District11. Lemon Grove Sanitation District12. San Diego County

Main Modificationsince late February

Pure Water San Diego Program

• Not Condition of Waiver

• Not legally enforceable

• Not needed to meetTentative Order requirements

March 30, 2017: Agenda Packagewith additional modificationsto Tentative Order

• Adoption of Revised Tentative Order– San Diego Water Board

• Endangered Species Act Consultation – US Fish and Wildlife Services and – National Marine Fishery Service

• Determination from– California Coastal Commission

• Final 301(h) Waiver Decision Document– USEPA Region 9 Administrator

Recommend Adoption

Mass Emissions Rate and Flow

Sediment chemistry (’95-’15)

0

0.05

0.1

0.15

0.2

0.25

B-12 B-9 E-26 E-25 E-23 E-20 E-17 E-14 E-11 E-8 E-5 E-2

Nitrogen total (mg/kg) 199192

93

94

95

96

97

98

99

00

01

02

03

04

05

0

200

400

600

800

1000

1200

B-12 B-9 E-26 E-25 E-23 E-20 E-17 E-14 E-11 E-8 E-5 E-2

BOD total (mg/kg)199192

93

94

95

96

97

98

99

00

01

02

03

04

05

Sediment chemistry (’95-’15)

0

20

40

60

80

100

120

140

160

180

200

B-12 B-9 E-26 E-25 E-23 E-20 E-17 E-14 E-11 E-8 E-5

Zinc total (mg/kg) 199192

93

94

95

96

97

98

99

00

01

02

03

04

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

B-12 B-9 E-26 E-25 E-23 E-20 E-17 E-14 E-11 E-8 E-5 E-2

DDT total (ng/kg) 199192

93

94

95

96

97

98

99

00

01

02

03

04

05

Benthic Community (‘91-’13)(benthic response index values)

-5

0

5

10

15

20

25

30

35

40

45

1991

-319

92-1

1992

-319

93-1

1993

-319

94-1

1994

-319

95-1

1995

-319

96-1

1996

-319

97-1

1997

-319

98-1

1998

-319

99-1

1999

-320

00-1

2000

-320

01-1

2001

-320

02-1

2002

-320

03-1

2003

-320

04-1

2004

-320

05-1

2005

-320

06-1

2006

-320

07-1

2007

-320

08-1

2008

-320

09-1

2009

-320

10-1

2010

-320

11-1

2011

-320

12-1

2012

-320

13-1

2013

-3

BRI

BRI-B9 BRI-E14 BRI-E26Pre-discharge Post-discharge

Reference

Minor deviation from reference

Loss in biodiversity

Survey (1991-2013)

Fish tissue conc. (‘95-’13)

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014

ug/k

g, w

et w

eigh

t

Year

total PCB concentrations in rockfish muscle at 98 meter stations

RF-2

RF-1