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ASHVILLE
LLE BRIDGE CREE REEK WATERSHED
STORMWAT
ATER QUAL ALITY TY MONI NITOR ORING
Community Meeting – November 15, 2018
Melanie Coffey, P.E., MS4 Stormwater Permit Administrator
EFFECTS OF STORMWATER RUNOFF ON OUR WATERWAYS
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R UNOFF ? Pet waste Lawn fertilizer Septic systems Livestock - - PowerPoint PPT Presentation
R UNOFF ? Pet waste Lawn fertilizer Septic systems Livestock - - PowerPoint PPT Presentation
A SHVILLE LLE B RIDGE C REE REEK W ATERSHED S TORMWAT ATER Q UAL TY M ONI ALITY NITOR ORING Community Meeting November 15, 2018 Melanie Coffey, P.E., MS4 Stormwater Permit Administrator E FFECTS OF S TORMWATER R UNOFF ON OUR W ATERWAYS 2 W
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WHAT’S IN OUR STORMWATER RUNOFF?
- Pet waste
- Lawn fertilizer
- Septic systems
- Livestock waste
- Waterfowl (ducks, geese)
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EFFE
FFECT CTS OF OF STORMWATER RUNOFF ON ON OU OUR WAT ATERWAYS
▪ Clean Water Act Goals Protect our creeks and rivers so they are fishable and swimmable ▪ How are these goals met?
- Virginia Department of Environmental Quality
- State Water Quality Standards
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VIRGIN
INIA IA DEPART RTME MENT OF ENVIRONM NMENT ENTAL QUALITY
▪ Performs Annual Water Quality Monitoring
- Monitoring samples are tested for
levels of nutrients, solids, bacteria, toxic metals, some pesticides, herbicides, and harmful organic compounds.
- About 33 monitoring stations in
Virginia Beach
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DEQ EQ S SURFA
FACE WATER QUAL ALITY PRO ROTECTI TION
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▪ Develops a water quality assessment every two years based on evaluation
- f the monitoring data
▪ Performs analysis to determine what amount of pollution the creek can handle without exceeding water quality standards ▪ Requires the City to meet the established pollutant reductions from stormwater runoff…MS4 Permit
MS4
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TREATMENT
NT OF STORM RMWATE TER RUNOFF OFF
▪ City of Virginia Beach MS4 Stormwater Permit and City Code Requirements ▪ New Construction ▪ Existing Development ▪ Construct & Maintain Stormwater Management Facilities
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STORMWATER QUALITY MONITORING EVALUATION
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ASHVILLE BRIDGE CREEK WATERSHED
- 24,000 acres of land
- Land Use: Developed (residential
and commercial), agricultural, and undeveloped
- DEQ identified impairments for
phosphorus and bacteria
North Bay
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STORMWATER QUALITY MONI
NITORING OBJ BJECT CTIV IVES
- 3. Verify a reduction in the concentration of various substances through
the pond system in the Ashville Park Subdivision
- 4. Verify concentrations of substances in the pumped stormwater are
similar to the pond stormwater
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- 1. Be responsive to resident concerns about
stormwater pollution
- 2. Verify concentrations of various substances
in the stormwater system are similar to national and/or regional average data
Mary Reid Barrow | For the Virginian-Pilot
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STORMWATER QUALITY MONI
NITORING OBJ BJECT CTIV IVES
Objective 1: Be responsive to resident concerns about stormwater pollution
Substances Initial Testing Parameters American Lotus Specific conductance (salinity), atrazine, simazine Submerged Aquatic Vegetation (SAV) Orthophosphates, Total Phosphorus, Ammonia Nitrogen, Nitrate, Nitrate-nitrite, Total nitrogen Fertilizers Same as SAV above Pesticides and Herbicides Azinphos methyl, demeton, diazinon Sediment TSS, Turbidity Bacteria Enterococcus Automobile fluids benzene, toluene, ethylbenzene, xylene
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STORMWATE
TER QUALITY MON ONITOR ORING OBJEC ECTIVES ES
Objective 2: Verify concentrations of various substances in the stormwater system are similar to national and/or regional average data ▪ How do we know what concentrations of parameters are in stormwater runoff? National Stormwater Quality Database United States Geological Survey Data
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STORMWATE
TER QUALITY MON ONITOR ORING OBJEC ECTIVES ES
Objective 2: Verify concentrations of various substances in the stormwater system are similar to national and/or regional average data
13 Test Site Test Site Test Site Test Site Test Site Test Site Test Site Test Site Test Site
Google Earth October 2018
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HOW IS LAND USED IN THE
WATERSHED?
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STORMWATE
TER QUALITY MON ONITOR ORING OBJEC ECTIVES ES
Objective 3: Verify a reduction in the concentration of various substances through the pond system in the Ashville Park Subdivision ▪ How should a pond system reduce concentrations?
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Ashville Park Subdivision - Google Earth October 2018
Test Site Test Site Test Site Test Site
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STORMWATER QUALITY MONI
NITORING OBJ BJECT CTIV IVES
Objective 4: Verify concentrations of substances in the pumped stormwater are similar to the pond stormwater ▪ What factors are related to water quality parameters when pumping stormwater runoff?
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Ashville Park Blvd. at Flanagan's Lane Sherwood Lakes – Google Earth 2018
Test Site Test Site Test Site Test Site Test Site
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STORMWATER QUALITY MONI
NITORING SCHED EDULE LE
Activity Timeframe Status Identify monitoring parameters and site selection September – October 2018 Completed Data collection November 2018 – February 2019 Underway Data analysis and report preparation March – May 2019 On schedule Potential additional data collection April – October 2019 TBD
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Melanie Coffey, P.E. (757) 385-8593
Public Works Engineering MS4 Stormwater Permit Administrator
False Cape
www.vbgov.com/stormwater-program Projects: Ashville Bridge Creek Stormwater Monitoring