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 HAT ’ S IN OUR S TORMWATER R UNOFF ? Pet waste Lawn fertilizer Septic systems Livestock waste Waterfowl (ducks, geese)
E FFE OF S TORMWATER R UNOFF ON OUR W AT FFECT CTS OF ON OU ATERWAYS ▪ Clean Water Act Goals Protect our creeks and rivers so they are fishable and swimmable ▪ How are these goals met? o Virginia Department of Environmental Quality o State Water Quality Standards 4
V IRGIN IA D EPART MENT O F E NVIRONM ENTAL Q UALITY INIA RTME NMENT ▪ Performs Annual Water Quality Monitoring o Monitoring samples are tested for levels of nutrients, solids, bacteria, toxic metals, some pesticides, herbicides, and harmful organic compounds. o About 33 monitoring stations in Virginia Beach 5
DEQ EQ S S URFA FACE W ATER Q UAL ALITY P RO ROTECTI TION ▪ Develops a water quality assessment every two years based on evaluation MS4 of 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 6
T REATMENT NT OF S TORM TER R UNOFF RMWATE OFF ▪ City of Virginia Beach MS4 Stormwater Permit and City Code Requirements ▪ New Construction ▪ Existing Development ▪ Construct & Maintain Stormwater Management Facilities 7
S TORMWATER Q UALITY M ONITORING E VALUATION 8
A SHVILLE B RIDGE C REEK W ATERSHED • 24,000 acres of land • Land Use: Developed (residential and commercial), agricultural, and undeveloped North Bay • DEQ identified impairments for phosphorus and bacteria
S TORMWATER Q UALITY M ONI NITORING O BJ BJECT CTIV IVES 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 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 10
S TORMWATER Q UALITY M ONI NITORING O BJ 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 Orthophosphates, Total Phosphorus, Ammonia Vegetation (SAV) 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 11
S TORMWATE TER Q UALITY M ON ORING O BJEC ONITOR 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 12
S TORMWATE TER Q UALITY M ON ORING O BJEC ONITOR ECTIVES ES Test Site Objective 2: Verify concentrations of Test Site Test Site various substances Test Site in the stormwater Test Site Test Site system are similar Test Site Test Site to national and/or Test Site regional average data Google Earth October 2018 13
H OW IS L AND U SED IN THE WATERSHED ?
S TORMWATE TER Q UALITY M ON ORING O BJEC ONITOR 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? Test Site Test Site Test Site Test Site Ashville Park Subdivision - Google Earth October 2018 15
S TORMWATER Q UALITY M ONI NITORING O BJ BJECT CTIV IVES Objective 4: Verify concentrations of Test Site substances in the pumped Test Site stormwater are similar to the pond stormwater Test Site Test Site ▪ What factors are related to water quality Ashville Park Blvd. at Flanagan's Lane Test Site parameters when pumping stormwater Sherwood Lakes – Google Earth 2018 runoff? 16
S TORMWATER Q UALITY M ONI NITORING S CHED EDULE LE Activity Timeframe Status Identify monitoring September – Completed parameters and site selection October 2018 November 2018 – Data collection Underway February 2019 Data analysis and report March – On schedule preparation May 2019 Potential additional data April – TBD collection October 2019 17
www.vbgov.com/stormwater-program Projects: Ashville Bridge Creek Stormwater Monitoring Melanie Coffey, P.E. (757) 385-8593 Public Works Engineering MS4 Stormwater Permit Administrator False Cape 18
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