First Flush 2015: Midcoast Storm Drains
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1 First Flush 2015: Midcoast Storm Drains
2 What is First Flush? First big rain of the season Freshwater runoff enters storm drains High pollution Sampled at outfall to ocean Nov 2 nd : 0.64 in
3 Partners
4 Objectives Better understand pollutant loads during the first significant rain of the season Identify what pollutants are of greatest concern and where Provide information to support water quality improvements Establish a continuous and consistent water quality dataset
5 2015 Sample Sites 7 th Street Vallemar Street Weinke Way San Vicente Creek Mouth West Point Vassar Street Capistrano Street Deer Creek El Granada Surfers Frenchmans Creek Pilarcitos Creek Mouth Pilarcitos Creek (Main Street Bridge) Arroyo Canada Verde Creek
6 2015 Sample Sites 202-MOSD-01: 7 th Street 202-MOSD-02: Vallemar Street 202-MBSD-01: Weinke Way 202-MBSD-05: San Vicente Creek Mouth 202-MBSD-04: West Point 202-EGSD-04: Vassar Street 202-EGSD-03: Capistrano Steet *202-PPSD-09: Deer Creek 202-EGSD-01: El Granada 202-EGSD-02: Surfers Beach 202-HMB-03: Frenchmans Creek 202-HMB-02: Pilarcitos Creek (Mouth) 202-HMB-01: Pilarcitos Creek (Main Street Bridge) 202-HMB-04: Arroyo Canada Verde Creek * Did not sample due to tidal inundation.
7 What are we testing? Pollutant Potential Sources Effects Fecal Indicator Bacteria (E. Coli, Enterococcus) Nutrients (Nitrate, Orthophosphate) Feces of warm blooded animals Fertilizers, pesticides detergents, human waste Indicator for human pathogens Eutrophication/harmful algal blooms-ecosystem and recreation impacts Metals (Copper, Zinc, Lead) Total Suspended Solids Brake pads, tires, streets, industrial waste, roofs, gutters, downspouts Construction sites, erosion, agricultural runoff Impacts to aquatic organisms and human health Sedimentation, respiratory effects in organisms
8 Physical Tests Transparency-daylight hours only ph Electrical conductivity Water temperature Observations: trash, odor, bubbles, scum, oil
9 Train and Mobilize Volunteers
10 Data Analysis Dry Run vs. First Flush 13 SMC sites in were historic sites ( ) Analyzed over time - Note no data for 2013 Qualitative Location Comparison Water Quality Objectives (WQOs)
11 Dates Nov 1, 2008 Oct 13, 2009 Oct 17, 2010 Oct 5,2011 Oct 22, 2012 Oct 31, 2014 Nov 2,2015 Actual Rainfall 0.42 in 2.86 in 0.52 in 0.88 in 0.71 in 0.14 in 0.64 in
12 Dry Run vs First Flush San Vicente Creek Mouth Parameter Dry Run First Flush Water Quality Objective E. Coli (MPN/100 ml) Entercoccus (MPN/100 ml) <235 MPN/100 ml <104 MPN/100 ml NO 3 -N (mg/l) < 2.25 mg/l O-PO 4 -P (mg/l) ND ND <0.12 mg/l Copper (µg/l) ND 5 <30 µg/l Lead (µg/l) ND ND <30 µg/l Zinc (µg/l) ND 11 < 200 µg/l TSS (mg/l) ND 473 <500 mg/l * Red indicates exceedance of water quality objectives
13 E. coli 2015 Detection Limit: 24,196 MPN/100 ml WQO<235 MPN/100 ml
14 WQO<235 MPN/100 ml
15 Enterococcus 2015 Detection Limit: 24,196 MPN/100 ml WQO<104 MPN/100 ml
16 WQO<104 MPN/100 ml
17 Copper (Cu) 2015 WQO<30 µg/l
18 WQO<30 µg/l
19 Zinc (Zn) 2015 WQO < 200 µg/l
20
21 Lead (Pb) 2015 WQO<30 µg/l
22
23 Nitrate (NO3-N) 2015 WQO< 2.25 mg/l
24 WQO<2.25 mg/l
25 Orthophosphate (O-PO4) 2015 WQO<0.12 mg/l
26 WQO<0.12 mg/l
27 Total Suspended Solids 2015 WQO<500 mg/l
28
29 SMC Results Summary 2015 summary (13 sites): Bacteria: 100% exceedance O-PO4: 85% exceedance Cu: 23% exceedance (West Point, Vassar, Vallemar) Zn: 15% exceedance (West Point, Vassar) Pb, NO3-N, TSS: 0% exceedance summary (9 historic sites) Bacteria: 100% exceedance O-PO4: 67% exceedance. El Granada every year Cu: 47 % exceedance. Vassar every year Zn: 16% exceedance. West Point exceeded most often TSS: 2% exceedance Pb, NO3-N: 0% exceedance
30 Historic Location Summary Metals & Nutrients: Lower nitrate and metals but similar O-PO4 to Monterey and Santa Cruz County Bacteria: SMC likely similar to Monterey County and Santa Cruz County? Different detection limits
31 Next Steps Implement Best Management Practices - Vegetated swales, permeable surface, education/outreach Continue program 7 years in San Mateo vs 16 years in Santa Cruz and Monterey Counties Make comparisons over time Multi-year funding for cost-effectiveness
32 Thank you! Questions? Brittani Bohlke Kaena Meyer San Mateo County Resource Conservation District
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