Specifications include, but are not limited to: The State seeks proposals to complete a Diagnostic Feasibility Study as described below for a potential future phosphorus inactivation treatment at Lake Carmi 1. Task One: Complete an analysis of existing lake and tributary data, recent reports found on the Lake Carmi Page, and other relevant information to support the identification of and justification for the appropriate phosphorus inactivation approach at Lake Carmi a. Lake Geomorphology Characterization: Summarize existing situation and key lake features and data that are relevant to the proposed type of phosphorus inactivation treatment contemplated for Lake Carmi, including pertinent information on Lake Morphology and Watershed Characteristics b. Brief Historical Summary: Provide a recent historical summary of interventions affecting in-lake phosphorus concentrations in the lake (internal and external loading) that are relevant to a potential future phosphorus inactivation treatment c. Anoxia Investigation: Perform an Anoxia Investigation using existing and new DO data, including platform data and DEC spatial sonde cast data to get a sense of how ubiquitous low DO conditions are in the lake during the spring/summer/fall months and (e.g. can we limit the area of a potential phosphorus inactivation treatment to only certain portions of the lake where low DO is occurring) 2. Task Two: Complete a Phosphorus Load Reduction Analysis a. TMDL Progress to Date: Assess progress towards achieving the phosphorus reduction targets in the 2009 TMDL, and what are the key remaining challenges that must be addressed before this goal can be met b. TP Load Reduction Analysis: Estimate TP load reductions (from all sources) needed to meet the 22 µg/L in-lake concentration target/goal identified in the TMDL c. External Load Reduction Analysis: Comment on whether external load reductions alone can get to the desired in-lake phosphorus concentration target in the TMDL, and, if not, describe what combination of interventions are needed to achieve the TMDL target, as well as potential outcomes from these interventions d. Tributary Data Analysis: Analyze existing tributary data and collect tributary data needed to assess the longevity and efficacy of any proposed phosphorus inactivation treatment in the lake, and identify any additional external load reduction requirements that must be met prior to implementing an in-lake phosphorus inactivation treatment e. Impact of Treatment on TMDL: Describe the likely impact, and over what time scale, a potential phosphorus inactivation treatment will have on the in-lake TMDL target, including a simple model using historical weather and water quality data that describes the range of potential in-lake phosphorus concentrations in the 5-10 years following a phosphorus inactivation treatment 3. Task Three: Complete Analyses to Identify Approach for a Future Phosphorus Inactivation Treatment
