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City of Roseville Studies of Soil Phosphorus Saturation and Vegetation Harvesting Fcasibi IM McCar-rons Wetland Treatment System Scope of Work - October 1 998 1. Soil Adsorption Capacity, Study (est. cost 529,000) Task A - Collect a series of eight (8) soil core samples to a depth of 20cm at previous sampling locations fron i the wetland portion of the treatment system, as noted In Metropolitan ou nc t l phase 1`1 and Phase I l I studies. Section the cores by depth (need to define how many) to analyze depth to which soils are P-saturated ��5,0 00). Task B - Examine the samples, by depth section, for pliosphor-us adsorption capacity and deterniine i 1'satur.til'O" of phosphorus has occurred ($20,000). Task - Prepare an analysis of the wetland soil condition, grid make recommend.-m ins #01 iriiliro%.irz:, phosphorus retention associated with the soils (S4,000). Vegetation HatTesting Study (est. cost S6,000) Task A - Undertake a literature surrey of vegetation harvesting in northern climates to red LICe p110SI-1110RIS lading, based on the preponderance of cattails in most of the system ($2,000). Task B - Cohlect-samples of vegetation to be harvested from eight (8) locations in the system, ami an.- lyze i()r phosphorus content in each part of the plant (ex. leaf, stern, rhizomes) ( 1,000). Task C - Assess tine feasibility for Roseville Public Works to successfully rerno%Fe pliosphorus via veget-iti%lc harvesting; if such an approach is found feasible, recommend a procedure for implementing a vegetati'Vc harvestin g program, including initial capital costs and long-term annual O&M costs ($3,000).