Salmon Falls TMDL Monitoring 2012 Pre-Season Meeting

Salmon Falls TMDL Monitoring2012 Pre-Season Meeting

Cayce Dalton, FB EnvironmentalMay 23, 2012South Berwick Town Hall

Meeting Agenda9:00 – 9:05: Welcome

9:05 – 9:20: Past Salmon Falls TMDL Monitoring

9:20 – 9:45: Monitoring in 2012

9:45 – 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 pageFor report, see “Salmon Falls” headinghttp://www.maine.gov/dep/water/monitoring/tmdl/tmdl2.html

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

Station TP1 PO4-P1 Chl-a1 NH32 NO2-NO32 TKN2 pH D.O. Temp. Salinity Secchi

SF16 √ √ √ √ √ √ √ √ √ √SF15 √ √ √ √ √ √SF11 √ √ √ √ √ √ √SF7 √ √ √ √ √ √ √

SF5.1 √ √ √ √ √ √ √ √ √SF53 √ √ √ √ √ √ √ √ √SF4 √ √ √ √ √ √ √ √ √ √ √

NOTES: 1. Two meter integrated core sample.2. Surface grab.3. Estimate flow.*Collect and vary duplicate each sampling event.

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

Station TP1 PO4-P1 Chl-a1 NH32 NO2-NO32 TKN2 pH D.O. Temp. Salinity Secchi

SF16 √ √ √ √ √ √ √ √ √ √SF15 √ √ √ √ √ √SF11 √ √ √ √ √ √ √SF7 √ √ √ √ √ √ √

SF5.1 √ √ √ √ √ √ √ √ √SF53 √ √ √ √ √ √ √ √ √SF4 √ √ √ √ √ √ √ √ √ √ √

NOTES: 1. Two meter integrated core sample.2. Surface grab.3. Estimate flow.*Collect and vary duplicate each sampling event.

• 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 §464.13

(2003):– Ignore bottom 0.5m– Thermally stratified waters exempt

• Barry, please chime in

Continuous Dissolved Oxygen Monitoring by ME DEP

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

Data Summary Slides Barry Mower, ME DEP

Nitrogen

Nitrogen

Chl-a

Chl-a

Total Phosphorus

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: http://www.fbenvironmental.com/project_salmonfalls.html