SECTION C11.0, WATER QUALITY MONITORING AND ANALYSIS

Transcription

1 Table C-11-1: Pesticide detections frequencies above aquatic life benchmarks and concentrations summary statistics (ng/l) from samples collected during storm events % Detected Mean Min Max Pyrethroid Pesticides (n=34) 40% Bifenthrin 90% 20 <2 85 Permethrin 60% 20 <2 100 Cypermethrin 45% 9.9 <2 63 l-cyhalothrin 25% 2.3 <2 10 Cyfluthrin 5.0% <2 <2 8.2 Organophosphorus Pesticides (n =37) 11% Malathion 48% 55 < Diazinon 3.7% 14 < Chlorpyrifos 3.7% 14 < Dimethoate 0% 18 < C-11-39

2 Table C-11.2: Regional bioassessment sites surveyed in 2012 StationID Creek Latitude Longitude ACJ01 Aliso Creek CC-CR Christianitos Creek LC-133 Laguna Canyon Wash REF-BC Bell Creek REF-FC Fremont Canyon Creek REF-TCAS Trabuco Creek SC-MB Salt Creek SD-AP Segundo Deschecha Creek SJC-74 San Juan Creek TC-DO Trabuco Creek SMC01934 Trabuco Creek SMC01987 Aliso Creek C-11-40

3 Table C-11.3: Metric scores, Index of Biotic Integrity scores of regional bioassessment sites in 2012 SMC01987 Metric REF-FC REF-TCAS SMC01934 SMC01987 Dupl. EPT Taxa Predator Taxa Coleoptera Taxa % Non-Insect Taxa % Intolerant Individuals % Tolerant Taxa % Collector Individuals Total Adjusted Total Fair Good Poor Poor Very Poor Metric ACJ01 LC-133 SC-MB SD-AP SJC-74 TC-DO EPT Taxa Predator Taxa Coleoptera Taxa % Non-Insect Taxa % Intolerant Individuals % Tolerant Taxa % Collector Individuals Total Adjusted Total Very Poor Very Poor Very Poor Very Poor Very Poor Very Poor C-11-41

4 Table C-11.4: Fecal indicator bacteria exceedance frequencies at all beach and channel sites during the entire year and AB411 period Entire Year Sample Type Site Visits N ENT FC TC Total All Samples Samples that FTO Enterococcus (ENT), Fecal Coliform (FC), and Total Coliform (TC), Flows to Ocean (FTO) AB411 Period Sample Type Site Visits N ENT FC TC Total All Samples Samples that FTO Enterococcus (ENT), Fecal Coliform (FC), and Total Coliform (TC), Flows to Ocean (FTO) C-11-42

5 Table C-11.5: Ranking of sites by percentage (%) of fecal indicator bacteria exceedances during all year and the AB411 period Rank Beach Station Entire Year AB411 Season days N Hits days N Hits 1 Poche POCHE % % 2 Doheny DSB % % 3 Doheny SJC % % 4 Doheny CSBMP % % 5 Doheny CSBBR % % 6 Salt Creek County SCM % % 7 Doheny DSB % % 8 Doheny DSB % % 9 Laguna Main Beach MAINBC % % 10 North Beach PICO % % 11 San Clemente City LINDAL % % 12 San Clemente City PIER % % 12 Laguna Main Beach VICTRA % % 13 Aliso Beach ACM % % 14 San Clemente City MARIPO % % 15 Cleo Street, Laguna CLEO % % 16 Emerald Bay EMRLD % % 17 Bluebird St, Laguna Beach BLUBRD % % 18 Victoria Beach BLULGN % % 18 Victoria Beach DUMOND % % 18 Crystal Cove State Park ELMORO % % 18 Diver's Cove, Laguna HEISLR % % 18 Pearl St, Laguna PEARL % % 18 San Clemente State Park RIVERA % % 18 North Beach, San Clemente SCCS % % 18 North Beach, San Clemente SCCS % % 18 San Clemente City TRFCYN % % 18 West St, Laguna Beach WEST % % C-11-43

6 Table C-11.6: Exceedance Rates in the Surfzone near Outlets of Coastal Drains that Flow to Ocean Entire Year AB411 Season Rank Staion days N % Rank Staion days N % 1 SJC % 1 POCHE % 2 POCHE % 2 SJC % 3 MAINBC % 3 MAINBC % 4 SCM % 4 SCM % 5 PICO % 5 PICO % 6 ACM % 6 BLUBRD % 7 BLUBRD % 7 ACM % 8 BLULGN 1 2 0% 8 CSBBR % 8 CLEO 2 4 0% 8 PIER 3 6 0% 8 CSBBR % 8 TRFCYN 3 6 0% 8 PIER 3 6 0% 8 TRFCYN 3 6 0% C-11-44

7 Table C-11.7: Total nitrogen concentrations (mg/l) in receiving waters during dry weather and storm events conditions Dry Weather Storm Event Station Mean Std Dev Mean Std Dev SDCM SC-MB 2.9 NA NA NA PDCM ACJ LCWI SJNL NA TCOL SMC NA NA NA SMC NA NA NA (SMC = Stormwater Monitoring Coalition Regional Monitoring Program site, n = 1) Table C-11.8: Total phosphorus concentrations (mg/l) in receiving waters during dry weather and storm events conditions Dry Weather Storm Event Station Total P Std Dev Total P Std Dev SC-MB 0.59 NA NA NA PDCM ACJ SDCM LCWI SJNL NA SMC NA NA NA TCOL SMC NA NA NA (SMC = Stormwater Monitoring Coalition Regional Monitoring Program site, n = 1) C-11-45

8 Table C-11.9: Average dissolved solids concentrations (mg/l) in dry weather and during storm events in receiving waters Dry Weather Chloride Sulfate Total Diss. Solids Prima Deschecha Segunda Deschecha Salt Creek Aliso Creek Trabuco Creek Laguna Canyon Wash San Juan Creek Aliso Creek (SMC01987) San Juan Creek (SMC01934) Storm Event Chloride Sulfate Total Diss. Solids Prima Deschecha Segunda Deschecha Aliso Creek Trabuco Creek San Juan Creek Laguna Canyon Wash Salt Creek NA NA C-11-46

9 Table C-11.10: Mean receiving water metals concentrations in dry weather and storm events Dry Weather Selenium Copper Zinc Segunda Deschecha Creek Salt Creek Prima Deschecha Creek Aliso Creek Trabuco Creek San Juan Creek San Juan Creek (SMC01934) Laguna Canyon Wash Aliso Creek (SMC01987) Storm Event Selenium Copper Zinc Segunda Deschecha Creek Prima Deschecha Creek Aliso Creek Trabuco Creek San Juan Creek Laguna Canyon Wash Salt Creek NA NA NA C-11-47

10 Figure C-11.1: Annual Rainfall Summary The annual rainfall summary for Santa Ana shows that this year s total of 8.27 inches was the fifth lowest total in the last 15 years. C-11-48

11 Figure C-11.2: Core and Regional bioassessment program IBI scores and physical habitat scores in 2012 C-11-49

12 Figure C-11.3: Dendogram analysis of sites surveyed in the from 2002 to 2012 C-11-50

13 C-11-51

14 Figure C-11.4: Two way coincidence table of sites surveyed in the from 2002 to 2012 C-11-52

15 Figure C-11.5: Index of Biotic Integrity scores at Urban Stream Bioassessment stations C-11-53

16 Figure C-11.6: South Orange County urban and reference stream Index of Biotic Integrity over the period of November 2002 to May 2012 C-11-54

17 Figure C-11.7: Enterococcus exceedance frequencies over the period of 2006 to 2011 at shoreline water quality monitoring sites Error bars represent the minimum and maximum annual exceedance frequency during the 2006 to 2011 period. Solid dots are beach sites with a cumulative exceedance frequency greater than 15%. Open dots are beach sites with a cumulative exceedance frequency less than 10%. C-11-55

18 Figure C-11.8: Percent of beach water quality monitoring sites exceeding Enterococcus single sample standard more than 5% per year C-11-56

19 Figure C-11.9: MS4 stormwater action level monitoring data from and wet weather discharges over the stormwater action levels Action Level Concentration (mg/l) Turbidity Nitrate+Nitrite as N Total P Action Level 1000 Concentration ( g/l) Cadmium Copper Lead Nickel Zinc C-11-57

20 Figure C-11.10: Magnitude of MS4 wet weather discharges over the stormwater action levels. A value of one indicates that concentrations are equal to the action level. C-11-58

21 Figure C-11.11: Magnitude of MS4 non-stormwater discharges over action levels and assessment benchmarks. A value of one indicates that concentrations are equal to the benchmark. Analyses shown are limited to constituents exceeding benchmarks by more than 10%. Enterococcus Total Nitrogen as N Total Phosphorus as P Total Dissolved Solids Sulfate Chloride Selenium Fecal Coliforms Copper Ammonia Turbidity Cadmium Nickel C-11-59

22 Figure C-11.12: Summary of toxicity testing results C-11-60

23 Figure C-11.13: Scatterplot of LC50 normalized Bifenthrin concentrations and Americamysis bahia toxicity from storm event samples collected in C-11-61

24 Figure C-11.14: Nitrogen and phosphorus proportions in MS4 dry weather discharges C-11-62

25 Figure C-11.15: Seasonal (summer) Fecal Coliform geomean and mean flow rate trends in Aliso Creek. C-11-63

26 Figure C-11.16: Geomean Fecal Coliform and Enterococcus concentrations from MS4 dry weather discharges over the period of 2003 to 2012 C-11-64

27 Figure C-11.17: Mean flow rates from MS4 non-stormwater discharges over the period of 2005 to 2012 C-11-65