RMP Coring Study Wrapup RMP CFWG Meeting June
- Slides: 15
RMP Coring Study Wrapup RMP CFWG Meeting June 2010
Core- What Is It Good For? • Bay pollutant inventory – erosional time bombs? • Model validation – Conceptual &/or mechanistic • Model development – Empirical, mechanistic, hybrid – Can recalibrate, but better up front
RMP/CEP Sites (Bay) • Representative – inventory, sedimentation • 3 sites Central Bay, 2 sites each other segments • Preference to RMP repeat stations
Distribution of Sites (Wetland) • Loading history – Depositional zones • 1 site each segment – – – Pt Edith Martinez Wildcat Richmond Damon Sl. Oakland Greco Island Coyote Creek • +1 watershed site – Alviso Marina
Bay Hg Results < 1960 < 1960
Conceptual Model Fits in Bay • Radiodating fits bathymetric history – North Bay erosive (137 Cs near surface) – Central, South Bay ~neutral, or erosive – Lower South Bay depositional • Contamination fits sediment history – Top core sections ~ RMP surface sediments – Lower contamination in deepest sections • pre industrial background – Contaminants elevated in industrial period • Metals ~uniform downcore, PCBs higher nearer surface
Wetland Hg Results < 1960 < 1960
Wetland Results • Radiodating fits sea level rise – All areas net depositional (2 -3 mm/year) – Lower South Bay subsided, higher deposition • Contamination fits sediment history – Top core sections ~ RMP surface sediments – Usually lower contamination in deepest sections • pre industrial background – Contaminants elevated in industrial period • Sharper/higher peaks than in Bay cores • Watershed (Alviso) site ambiguous – Rapid deposition, but where is Hg peak?
Core- What Was It Good For? • Bay pollutant inventory – Few time bombs other than LSB, wetlands • Model validation – Results fit conceptual model of • mostly terrestrial/watershed sources • In-Bay dispersion, dilution • Model development – Some data for next generation of models
Immediate Next Steps • Close of review comment period • Revisions, final report July 5 Near-term additions • Dioxins in Bay cores (4 -5 sections x 11 cores) for exposure risk $57 k – Need wetlands if info on loading history needed • Any need for more PBDEs? – Only 3 wetlands. Remaining wetlands (+Bay) would provide contrast to older legacy – Lab currently has samples, will discard
Longer Term Next Steps? • Better than before, but enough? – N = 11 from RMP/CEP + 2 -5 from USGS • N depends on which analytes – OK for Baywide scale but few for segment specific modeling (N=2) – Nothing in shallow waters (<2 m) • Time frame needed – Before new models need data • Resolution needed – What scale are we actually planning to act on?
Logistical Lessons 1. Waiting for preliminary radiodating slowed study 2. Created backlog at RMP laboratories (3+ years equivalent of S&T samples) 17 cores x 10 sections/core = 170 samples 3. Total cost $300 k+, hard to reduce, especially analytical costs (1 site = 10 samples x X analytes)
Incremental Efforts 1. 2 Bay sites (optionally +1 wetland? ) in one Bay segment per year 2. Gravity/hammer core in Bay, Livingstone (piston) core in wetland 3. Analyze up to 10 sections at ~10 cm (skipping) intervals Cost ~$50 k for Bay cores, ~$75 w/ wetland (PCBs, Hg, metals, TOC, grainsize)
+/- Incremental Approach • Few sites, more often (e. g. 2 per segment, different ones yearly) + Better workload for labs (20+ vs 100+ samples at once) + Costs better spread for RMP + Can get info on segments w/ greatest data needs first - Long time to get full Baywide set • Other details decided depending on program needs
Back to Basic Questions • Do we need more cores? – Probably, especially if we plan sub-segment scale models • All at once, or a few at a time? – A few at a time is easier for many logistical and budget reasons • When, where, how many? – Best early/before models finished, random/ representative of areas modeled, # samples depending on model questions, scale
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