Session 2A MS4 Outfall Screening and Sampling. Sarah Bounty, Staff Engineer

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1 Session 2A MS4 Outfall Screening and Sampling Sarah Bounty, Staff Engineer

2 Introduction to Illicit Discharges What is an Illicit Discharge? EPA says any discharge to a MS4 that is not composed entirely of stormwater Indirect Discharge to MS4 May come from a variety of sources Infiltration from failed sewer line or septic system Hazardous waste spills Construction site runoff Grass clippings, leaf litter, or other solid material deposited into catch basin Direct Connection to MS4 A non-stormwater pipe connected to the MS4 Washing machine Floor drain Sewer line or septic system

3 Introduction to Illicit Discharges Allowed Non-Stormwater Discharges Flows from Fire Fighting Activities Waterline/hydrant flushing Dechlorinated swimming pool water Water from individual residential vehicle washing Landscape irrigation or lawn watering Uncontaminated pumped groundwater

4 Final Permit Outfall Sampling Requirements Dry Weather All outfalls within 3 years of permit effective date Wet Weather All outfalls with one or more System Vulnerability Factor sampled during wet weather before catchment is complete

5 Timeline (handout)

6 System Vulnerability Factors History of SSO s Inadequate level of service or frequent complaints of backups Common or twin-invert manholes serving both storm drain and sanitary sewer Common trench construction serving both storm drain and sanitary sewer Crossing of storm drain and sanitary sewer lines where sanitary is shallower than storm drain Sanitary sewers known or suspected to have underdrains Defects in sanitary sewer infrastructure Areas formerly served by combined sewers

7 Sampling parameters Bacteria (E. coli or Enterococcus) Temperature Salinity Conductivity Total Chlorine Surfactants Ammonia Other (Pollutants of Concern see Appendix G of the permit)

8 Taking an Outfall Sample Prep beforehand bring necessary items Locate outfalls, group together

9 Outfall Sampling Find outfall and a safe place to sample from Label sample bottle Fill out sampling form Put on gloves Take sample at discharge point sample water only Place samples on ice for bacterial/laboratory analysis Hold time is 6 hours for bacteria Perform field testing Fill out applicable laboratory chain of custody

10 Cost of Test Kits Parameter Total Price & # Tests Cost per Outfall Chlorine test kit (Hach) $21.25/100 tests $0.21 Ammonia test strips (Hach) $23.85/25 tests $0.95 Surfactant test kit (Chemetrics) $65.36/20 tests $3.27 Bacteria ~$65.00 Total $69.43 Other costs: YSI30 Salinity/TDS/Conductivity meter $580 Hach Pocket Colorimeter (chlorine)- $430 Initial Surfactants Kit - $85/20 tests Pollutants of Concern: YSI (Dissolved Oxygen) meter, laboratory tests (costs vary)

11 Safety Considerations Sample collection Slips, trips, falls Poison ivy, bees Slippery conditions Visibility on roadways Lots more Hazardous waste disposal

12 Demonstrations Bacteria (E. coli or Enterococcus) Temperature Salinity Conductivity Total Chlorine Surfactants Ammonia Other (Pollutants of Concern)

13 Session 2B Catch Basin Inspections & Tablet Data Collection Options Jennie Moonan, P.E., Project Manager Natalie Koncki, Environmental Scientist

14 Purpose of Catch Basin Cleaning Avoid flooding Minimize pollutants from entering nearby waterbodies EPA MS4 permit compliance

15 EPA s Expectations for Catch Basin Inspections, Cleaning, and Maintenance Create cleaning schedule to prevent CB sumps from becoming more than 50% full Keep track of CB sumps that were more than 50% full More frequent cleaning after 2 consecutive times Prioritize CBs located near construction Keep a log of inspections and cleanings Connection to Storm Drain Properly store and dispose of CB cleanings Sump 50% MassDEP Management of Catch Basin Cleanings Guidance

16 EPA s Data Collection & Reporting Requirements By July 1, 2018 (Permit Year 1): Document plan for CB cleaning in written Stormwater Management Program and first Annual Report Annually by July 1: Provide metrics in Annual Report Explain how specific problems were addressed By July 1, 2027 (end of Permit Year 10): All CBs must be mapped! Metrics: Total # of CBs # Inspected # Cleaned Total volume or mass removed

17 How to keep that log Options for Tracking & Reporting CB Inspections, Cleaning, and Maintenance ArcGIS Online Ready to use apps People Forms Paper Collector for ArcGIS Map Based Survey123 Form based

18 Outfall Inspections

19 Survey123 Form-Based Inspections

20 Source Information

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22 And now on to the group activity Jennie