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Bolsa Chica New Channel Bolsa Chica New Channel Effect on Shoreline Water Effect on Shoreline Water Effect on Shoreline Water Effect on Shoreline Water Quality Quality Douglas Moore, Ph.D. (OCPHL) Douglas Moore, Ph.D. (OCPHL) Charles McGee (OCSD) Charles McGee (OCSD) Martin Getrich (OCPHL) Martin Getrich (OCPHL) Patrick Pham (OCEH) Patrick Pham (OCEH)

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Page 1: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Bolsa Chica New ChannelBolsa Chica New ChannelEffect on Shoreline Water Effect on Shoreline Water Effect on Shoreline Water Effect on Shoreline Water

QualityQuality

Douglas Moore, Ph.D. (OCPHL)Douglas Moore, Ph.D. (OCPHL)Charles McGee (OCSD)Charles McGee (OCSD)Martin Getrich (OCPHL)Martin Getrich (OCPHL)Patrick Pham (OCEH)Patrick Pham (OCEH)

Page 2: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Sampling Sites at Bolsa Chica State Beach and Huntington City Beach

Page 3: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Location of Future Channel and Two Added Study Sampling Sites: BCN and BCS

Page 4: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Bolsa Chica Wetlands after Channel Opening

Page 5: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Study OutlineStudy Outline

• Study utilized shoreline water quality data.Study utilized shoreline water quality data.• Pre-Channel June 7, 2005 – Aug 23, 2006• Post-Channel Aug 24, 2006 – Aug 27, 2007

– 5 sample sites for Bolsa Chica Site• Channel Opened Aug 24, 2006• 4 Beach Sites (n = 190 to 450 per site)( p )• 1 Mid-Channel Feb. 2007 – Aug. 27, 2007 (n = 25)

– 8 sample sites for Santa Ana River Site• Date range from June 7 2005 Aug 27 2007• Date range from June 7, 2005 – Aug. 27, 2007• 5 Beach Sites (n = 440 to 450 per site)• 3 Channel Sites ( n = 450 to 480 per site)

Page 6: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Study DetailsStudy Details

• Collection & Testing conducted by Orange County Sanitation g y g yDistrict. Total Coliforms, Fecal Coliforms, & Enterococcus Tested.

• Data analysis by OC PHL & OC EH

• Dry weather data only, rain periods excluded

• Statistical Analysis• Statistical Analysis– Geomean– Failure rates – single samples exceedances– Differences in values before and after channel opening

• The Mann-Whitney U – nonparametric rank test

Page 7: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Bolsa Chica Enterococcus Data, All SitesN = 1289

3.00

PostPre

Channel

2 00 104 CFU/ 100 ml

og (E

NT)

2.00 104 CFU/ 100 ml

Lo

1.00

Geomean 5.2 CFU/100 ml

Date

0.0001/0112/0111/0110/0109/0108/0107/0106/0105/0104/0103/0102/0101/01

Page 8: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Bolsa Chica Geomean of Single Sample LevelsBolsa Chica, Geomean of Single Sample Levels

30Pre Channel Post Channel

**

15

20

25

00m

l

5

10

15

CFU

/1

0

5

TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent

33N BCN CHAN BCS 27NSite/Indicator

* Statistically significant for p < 0.05, by Mann-Whitney U Test

Page 9: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Bolsa Chica % Single Sample ExceedanceBolsa Chica, % Single Sample Exceedance

5 0%

6.0%

nces

Pre Channel Post Channel

3.0%

4.0%

5.0%

Exce

edan

0 0%

1.0%

2.0%

Sam

ples

E

0.0%TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent

33N BCN CHAN BCS 27N

S

Site/Fecal Indicator Bacteria

Page 10: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Conclusions Bolsa ChicaConclusions, Bolsa Chica

• Opening channel did not degrade waterOpening channel did not degrade water quality at adjacent beaches in a one year dry weather study. y y

• Water taken directly from channel has very low concentrations of indicator organisms.g

• Study will be continued one additional year.y

• Effect during rain events is unknown at this time.

Page 11: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Sampling Sites at Huntington State Beach/Newport Beach

Page 12: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Santa Ana River Region Enterococcus Data, All SitesN = 3624

3 00Channel

3.00

PostPre

2.00 104 CFU/100 ml

Log

(ENT

)

1.00

Geomean 8.0 CFU/100 ml

0.00

Date01/0112/0111/0110/0109/0108/0107/0106/0105/0104/0103/0102/0101/01

Page 13: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

SAR R i G S l L lSAR Region, Geomean Sample Levels

80

90Geomean

40

50

60

70

U /1

00 m

l

10

20

30

40

CFU

0TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent

6N 3N TM 0 SAR-N SAR-S 3S 6S

Sample SiteSa p e S te

Page 14: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

SAR Region % Single Sample ExceedancesSAR Region, % Single Sample Exceedances

14.0%

16.0%

8.0%

10.0%

12.0%

ceed

ance

%

2.0%

4.0%

6.0%Exc

0.0%TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent TC FC Ent

6N 3N TM 0 SAR-N SAR-S 3S 6S

Sample SiteSa p e S te

Page 15: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Comparison of Bolsa Chica and Santa Ana River RegionSingle Sample Exceedances

5%6%7%8%

ance

**

0%1%2%3%4%

Exce

eda

0%TC FC Ent TC FC Ent

Bolsa Chica Santa Ana River

Indicator/Sample Site

* Statistically significant for p < 0.05, by Mann-Whitney U Test

Page 16: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Conclusions Santa Ana RiverConclusions, Santa Ana River

• Channels degrade water quality at downChannels degrade water quality at down current adjacent beaches.

• Water taken directly from channel oftenWater taken directly from channel often has high concentration of indicator organisms.g

• Other studies have shown high levels of enterococcus in channel sediment.

• Dry weather beach failures are correlated with spring tides. p g

Page 17: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Bolsa Chica Wetlands Pollution Factors

Storm Drains: None

Drainage Area: Wetlands only

Intertidal Area: Small but increasing when partial tidal area is opened.

Bird Population: Yes ?Bird Population: Yes ?

Tidal Effect: ?

Page 18: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

SAR/Talbert Channels Pollution FactorsStorm Drains: Numerous in both SAR and Talbert Channel (diverted in dry weather)

Drainage Area: Extensive below Prado Dam. Huge total area above dam.

Intertidal Area: Large percentage of wet zone

Bird Population: Yes ?

Tidal effect: Beach pollution occurs during spring tides.

Page 19: Bolsa Chica New Channel Effect on Shoreline Water Qualitybos.ocgov.com/legacy5/newsletters/pdf/MooreCC112907EffectoftheBC… · Bolsa Chica New Channel Effect on Shoreline Water Quality

Conclusions• Bolsa Chica is an estuary with a channel that doesn’t

degrade water quality in dry weather. g q y y• Certain factors may determine if an estuary will degrade

surrounding water quality. Connection to storm drains is the main factorthe main factor.

• Routing storm drains through wetlands will possibly pollute the wetlands as well as the receiving water.O /B h t lit t di h ld b t f• Ocean/Beach water quality studies should be part of Bolsa Chica operation.

• Santa Ana River/Talbert Channel is an example of a pwetland/ storm drain system that pollutes adjacent beaches even with diverted storm drains. Cause should be determined through further studies. g