Monitoring Considerations and Costs

Transcription

1 Monitoring Considerations and Costs By: Mike Hardin, Ph.D., P.E., CFM Water Resources Engineer Stormwater BMP Selection, Design and Monitoring Seminar September 9, 2016

2 Regulatory Requirements Best Practices, Resources, and Equipment Logistics and Security Examples Conclusions Outline

3 Regulatory Requirements

4 Regulatory Requirements Regulatory Requirements and Standards Granted-funded water quality projects (319 Grants) have specified quality assurance requirements Chapter F.A.C. DEP-QA-002/02 Requirements for Field and Analytical Work performed for the Department of Environmental Protection under Contract FDEP Standard Operating Procedures for Field Activities Other Potential Agency Requirements: NPDES MS4 Permit Monitoring Requirements WMD Environmental Resource Permits Annual monitoring or reporting requirements to satisfy permit conditions

5 Regulatory Requirements Recent and Upcoming EPA NPDES Phase II MS4 General Permit Remand (Final Rule to be implemented in November 2016) Impact: Revisions to the NPDES Phase II MS4 permits potentially requiring additional permitting review of an MS4s BMPs to demonstrate BMP effectiveness. Dissolved Oxygen Criteria (DEP-SAS-001/13 March 2013) Need to measure % saturation. Based on statewide analysis, DO criteria for Florida s Class I and III freshwaters are expressed as: No more than 10% of the daily average percent DO saturation values shall be below 38% in the Peninsula bioregion Impact: Modified SOP Freshwater Ammonia Criteria (Proposed) Proposed criteria for TAN rather than only un-ionized ammonia nitrogen (Florida s current criterion) Impact: Modified ammonia analyte. Proposed criteria would be more stringent than un-ionized ammonia criterion at ph below 7 and 7.5 Bacteriological Criteria (Proposed) Revise fecal coliform criteria to E. coli in freshwater and Enterococci in marine waters Impact: Modification of analytes in required sampling

6 Best Practices, Resources, and Equipment

7 Best Practices: Quality Assurance Project Plan The most important document in any monitoring project Acts as the official sampling program approved by the City and/or grantor agency Provides an opportunity to adapt cookie cutter monitoring requirements in a grant into reasonable sampling goals, means, and methods Allows for agency buy-in of novel approaches (equipment, sampling, etc ) for unique sampling circumstances Don t simply use the last QAPP that was developed from another project Lab Quality Manual review

8 Best Practices Field Checklists Ensure rain gauge is level and funnel is not clogged Calibrate Flow meters, level, and auto-sampler sample volumes Ensure modules are plugged into the correct port Ensure pump tubing is not cracked Conduct equipment blank when tubing is replaced Ensure suction line is at the lowest point of collection Flow meter is affected by turbulence, place flow meter in area of low turbulence to the extent practical Position sample jars correctly inside auto-sampler Ensure battery is properly connected and being charged from power source Complete maintenance logs for all maintenance activity

9 Resources

10 Equipment Measurement Capabilities Parameters: rainfall, level or flow (area / velocity) Triggers Any of the rainfall, level or flow parameter Can daisy chain multiple auto-samplers together so that when one auto-sampler triggers, the next one triggers simultaneously or after a certain time delay Suction line Vinyl, polyethylene, silicone Strainer Stainless Steel, Composite Power (solar, battery, direct) Bottle(s) material and number

11 Logistics and Security

12 Logistics and Security Considerations Need power for monitoring equipment and auto samplers Needs to be reliable Theft proof Run power to site? Cost? Solar power? Sun exposure?

13 Logistics and Security Challenges Cost too high to run power to site Use solar Poor sun coverage Elevate panels Locate nearby and provide longer wires Theft! Elevate solar panels and provide security Add lights, dummy security camera, and sign

14 Logistics and Security

15 Examples

16 Stormwater Harvesting Monitoring Large stormwater harvesting project in Central Florida Widen existing canal to create a lake for stormwater harvesting of water for irrigation in the park 319 grant was received from FDEP Needed sampling! FDEP required flow weighted sampling for qualified events ( inch)

17 Stormwater Harvesting Monitoring So, hydrology important to sampling For monitoring, needed to relate storm size to volume of runoff received Original model used composite CN method model showed no runoff for qualifying storms Must take DCIA into account or use Green Ampt method Was remodeled using Green Ampt Success!!

18 Stormwater Harvesting Project Stormwater Harvesting Monitoring

19 Stormwater Harvesting Project Stormwater Harvesting Monitoring

20 Stormwater Harvesting Project Stormwater Harvesting Monitoring

21 Stormwater Harvesting Project Stormwater Harvesting Monitoring

22 Stormwater Harvesting Project Stormwater Harvesting Monitoring

23 Stormwater Retrofit Example Rain Gauge Solar Panel Storm Shelter Modular Wetland with Bold and Gold

24 Stormwater Retrofit Example Ditch Inflow ISCO 6712 with Telemetry for Remote Access Area / Velocity Sensor

25 Stormwater Retrofit Example Influent Water Effluent Water

26 Conclusions

27 Conclusions A thorough and detailed QAPP helped facilitate FDEP approval of non-sop standards for analytes: Example: Oil & Grease allowed to be collected in the auto-sampler, which is not generally permitted per FDEP SOP Accounting for sediment accumulation in the design phase is critical to maintaining free-flowing conditions during operation Pass-through BMPs MUST have a well-designed emergency / bypass overflow, should the BMP become clogged Having a high-resolution hydraulic and hydrologic (H&H) model helps predict stormwater flows that can be used to program auto-samplers to collect flow-weighted samples across the storm event Using innovative triggering mechanisms can help simultaneous (or specific timedelayed) triggering and collection of flow weighted samples Understanding the impacts of high tailwater on flow meters Qualifying rain events tend to occur at 1:00 AM

28 THANK YOU! QUESTIONS??