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CITY OF SANTA ANA RFP NO.: 22-151 THORNTON PARK LAKE CIRCULATION STUDY & RENOVATIONS Task 2: Water Quality Sampling and Assessment/Report Consultant shall provide labor, equipment, materials and incidentals to collect a total of four water samples from two locations each; top and bottom water during a single date. Samples shall be used to: • Characterize water quality of the lake, estimate dissolved oxygen requirements and to identify potential nuisance problems including sulfides, algae and other pollutants. • Measure physical and chemical parameters including but not limited to dissolved oxygen, acid/base readings (pH, Total Alkalinity), temperature, oxidation-reduction potential, salts (chloride, conductivity, hardness). • Analyzed for water quality parameters as determined necessary, including nutrients like carbon, total nitrogen, total phosphorus, ammonia, sulfur, iron, and manganese compounds. Water clarity should also be identified including but not limited to turbidity, color total dissolved solids. • Preliminarily size, design, and layout the water quality system treatment train including up -flow media biological filters, wetland filters, vegetated wetlands, aerated artificial reefs, aquatic vegetation planting palette, and lake surface skimmers. o Provide efficient biological nutrient removal, chemical component removal, macro -pollutant removal (trash and debris). o The water quality system components will be sized to provide sufficient treatment capacity to maintain the circulation system water exchange rate/lake turn -over rate with adequate flexibility to adjust the system for perennial lake water quality condition variations. ➢ Deliverables from this task shall include a Water Quality Report which summarize the findings, and provide recommendation to restore water quality to optimal conditions. Water quality system sizing calculation results (included in study report) and exhibit showing recommended water quality system. Task 3: Survey and Analysis • Complete Hydrographic and Bathymetric survey to determine extent of debris accumulation • Complete Sedimentation Analysis • Complete Aquatic Vegetation Mapping ➢ Deliverables from this task shall include a color -coded bathymetry map. "x,y,z" data file, analyses, map, deliverables shall be submitted within 5 days of completion of the survey. Task 4: Lake Liner System Design • Complete a water balance analysis for the lake system including irrigation demands for the project to determine the total water requirements. Water demand analysis will evaluate water demands monthly for a total year period. A simplified water balance will be prepared that analyzes all the water inputs and withdrawals to determine the amount of "makeup water" required for the lake operation, as well as irrigation demands. The water entering from the project will include both nuisance and stormwater runoff. The analysis will evaluate both average year and dry year conditions. The soil analysis results will be used to develop design recommendations for reconstruction of the lake liner as determined from the water balance/seepage loss calculations and the hydrogeologic analyses. ➢ Deliverables from this task shall include Lake liner design recommendations (included in study report) and exhibit Page 3 of 6