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Table A2. Stage Specific Risks and Mitigation Coordinate with IRFWCD to suspend pump- Herbicides/Toxins/Heavy ing during heavy periods of herbicide spray - Metals in water impact sys- ing tem, biomass quality. Evaluate pre-settling/clarifiers, filtration meth- ods and/or chemical precipitation to remove toxins 1. Site selection, Increase hydraulic detention times in floating preliminary wa- Suspended solids difficult to plant modules; modify tanks with weirs to as- ter testing, con- settle; lack of settled material sist with settling struction of pilot for analysis Install clarifier prior to floating aquatic plant module. Re -allocate funds to provide renewable power Available sites distant from (solar) to power pilot. electrical connections; Unex- pected construction diffi- Reduce number of parallel test systems to culties/costs three; allocate funds to cover increased costs site 11 274 Analyze tissues to identify micronutrient defi- ciencies, adjust module order/species as re - Poor growth/health of aquatic quired. plants in modules across pilot Remove impacted modules, evaluate reduced 2. Pilot Testing module treatment system Stage 2 Floating plants exhibit differ- Y P If health is deleterious) impacted b settled Y ential health between serial solids, pre -settle solids with lamella clarifier tanks (eg., plant health better/ If plant health is improved by nutrients in sol - worse in tank with settled sol- ids, re -plumb so both floating plant tanks re - ids) ceive water in parallel (not in serial) 'Optimal' plants show season- Supplement plants in impacted modules with va al variability in health and nu - al different species; conduct 'mixed' community removal triexperiments 3. Pilot Testing Stage 3:Optimal Modules show low/no nutrient Remove or reorder modules removal plants Unexpected module specific water chemistry impacts (eg., Re -order, remove or reconfigure modules effluent from emergent mod- ule is very low DO) 11 274