Salmon Falls TMDL Monitoring 2012 Pre-Season Meeting Cayce Dalton, FB Environmental May 23, 2012 South Berwick Town Hall

Meeting Agenda 9:00 – 9:05: Welcome 9:05 – 9:20: Past Salmon Falls TMDL Monitoring 9:20 – 9:45: Monitoring in :45 – 9:55: Salmon Falls Watershed Collaborative 9:55 – 10:25: Future Monitoring 10:25 – 10:30: Conclusions, Next Steps

Total Maximum Daily Load 1999 TMDL Cites data and modeling that show impairment Calculates allowable pollutant loads 2000 Work Plan, revised 2006, outlines this monitoring Link to ME DEP TMDL page For report, see “Salmon Falls” heading

Map Seven locations Bracketing all plants, plus Great Works R. and an estuarine site Four are in impoundments

Water Quality Criteria NH & ME Freshwater and tidal Based on Designated Uses & Class

July – August Grab Sampling Seven sample locations Some impoundments, some free-flowing Parameters vary by site

July – August Grab Sampling All sites: phosphorus (TP & ortho-P), pH, DO, Temp Selected sites: chlorophyll-a, ammonia, nitrate+nitrite, total Kjeldahl nitrogen, transparency Salinity at tidal sites

Low flow, check for <114 cfs at Milton 3 Ponds dam Last sample taken by 8 am for low dissolved oxygen 114 cfs

July – August Grab Sampling Sample collection by boat Delivered within hours to ME Health and Environmental Lab (HETL) Concerns about detection limit

Continuous Dissolved Oxygen Monitoring by ME DEP Data sondes at SF16, SF7 Based on 38 MRSA § (2003): – Ignore bottom 0.5m – Thermally stratified waters exempt Barry, please chime in

Continuous Dissolved Oxygen Monitoring by ME DEP ME DEP policy, measure 1 st meter below thermocline Depth where temp changes by 1°C /m of depth Thermocline is mobile

Continuous Dissolved Oxygen Monitoring by ME DEP ME DEP policy, measure 1 st meter below thermocline Depth where temp changes by 1°C /m of depth Thermocline is mobile

Data Summary Slides Barry Mower, ME DEP

Nitrogen

Chl-a

Total Phosphorus

2012 Monitoring Plan Three dates, mid July - August Same sites, parameters at low flow, early AM ME DEP lends data sondes FBE adjusts sondes based on thermocline More information online: