Exceeding the Benchmark Value:

Transcription

1 Exceeding the Benchmark Value: How to Maximize Cost Savings for IDDE Program Implementation Teri Demers, P.E. Woodard & Curran Andover, MA

2 Today We Will Discuss City of Lawrence background MS4 General Permit and Consent Decree requirements Development of IDDE Program IDDE Program implementation Lessons learned

3 Learning Objectives What are the key components of an effective IDDE Program? What are some implementation techniques for maximizing cost savings? How can I streamline the data collection process?

4 City of Lawrence, Massachusetts 25 miles north of Boston Incorporated in 1847 Nation s first planned industrial city Mills and other infrastructure built by the Essex Company Leader in the textile industry by early 1900 s

5 City of Lawrence, Massachusetts Land area: 7 square miles Current population: 80,000 residents 74% Hispanic 34% below poverty line 131 miles / 692,000 LF of sewer (70% combined) 31 miles / 164,000 LF of separated stormwater

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7 What is an MS4 General Permit? Clean Water Act requires EPA to regulate discharges from the municipal separate storm sewer system (MS4) In Massachusetts, EPA administers this permit Every five year a new permit is drafted and issued (in theory) Six Minimum Control Measures (MCMs) Public Education, Public Involvement, Illicit Discharge Detection and Elimination, Construction Site Runoff Control, Post Construction Stormwater Management, Good Housekeeping and Pollution Prevention

8 Development of IDDE Program IDDE Monitoring Plan Assess potential for illicit discharge IDDE Investigation Plan Track and isolate the source(s) IDDE Abatement Plan Enforcement actions and deadlines Training Program

9 What are Illicit Discharges? EPA says any discharge to a MS4 that is not composed entirely of stormwater Indirect Discharge May come from a variety of sources Failed sanitary sewer collection Hazardous waste spills Illegal Dumping including: grass clippings, leaf litter, pet waste or other solid material dumped into catch basin Direct Connection A non stormwater pipe connected to the drain Sewer line or septic system overflow Washing machine Floor drain

10 Challenges for IDDE Program Development Numerous unconfirmed pipe openings from mills Incomplete records of stormwater systems High illicit discharge potential Historically combined areas Aging infrastructure

11 IDDE Monitoring Plan Storm sewer system map Baseline outfall screening Dry and wet weather monitoring Flowing outfalls sampled for indicator parameters Catchment prioritization Problem (red) High Priority (orange) Low Priority (yellow)

12 IDDE Investigation Plan Generally follows EPA New England s draft Bacterial Source Tracking Protocol Indicator Parameter Benchmark Concentration Instrumentation Analytical Method E. coli 235 cfu/100 ml Surfactants (as MBAS) Ammonia (NH 3 ) Total Chlorine 0.25 mg/l 0.5 mg/l > 0.05 mg/l method detection limit via MA certified laboratory CHEMetrics K 4900 Field Kit CHEMetrics K 1510 Field Kit CHEMetrics K 2504 Field Kit 9223 B Methylene Blue Direct Nesslerization DPD

13 ESRI Collector Application Interactive mapping application Able to link investigation results to pipe segments in the field Allows for real time tracking of investigation status Eliminates redundant data entry back at the office Improves QA/QC process Working with same live GIS data as the City, other field crews, etc.

14 Verifying Illicit Connections

15 Verifying Illicit Connections Inspection Date Weather Surfactants (ppm) Ammonia (ppm) Chlorine (ppm) E. Coli (MPN/100 ml) Initial Monitoring Results 06/24/2014 Dry ND 6,600 10/16/2014 Wet ,000 Post Abatement Confirmatory Monitoring Results 07/14/2016 Dry ND < 10 08/22/2016 Wet ND 0.1 ND 4,884

16 IDDE Investigation Costs Activity Field Investigations Outfall Monitoring Bracket Sampling Pipeline Cleaning & CCTV Inspection Approximate Cost Up to $1,500 per day (2 person crew) $250 $300 per outfall $140 $220 per manhole Up to $3,000 per day Other considerations: program development or updates, ongoing data management, abatement design and construction, compliance reporting

17 Recap of Learning Objectives Monitoring Plan Baseline screening Catchment prioritization Investigation Plan Abatement Plan Training Program What are the key components of an effective IDDE Program?

18 Recap of Learning Objectives GIS mapping Electronic data collection ESRI s Collector App How can I streamline the data collection process?

19 Recap of Learning Objectives Maximize use of technology Prioritize investigations based on weight ofevidence (WoE) Coordinate with sewer system improvement programs What are some implementation techniques for maximizing cost savings?

20 Acknowledgements Brian Peña, P.E., Water & Sewer Commissioner, City of Lawrence Dan Lahiff, Water & Sewer Supervisor, City of Lawrence Justin demello, P.E., Project Manager, Woodard & Curran Zach Henderson, CPSWQ, Technical Manager, Woodard & Curran Rachel Osborn, GIS Analyst, Woodard & Curran Garrett Bergey, CPMSM, Project Manager, Stacey DePasquale Engineering

21 Questions? Thank you! Teri Demers, P.E. Woodard & Curran Andover, MA (978)