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• evapotranspiration • irrigation withdrawals • excess irrigation inflow Usingthe water balance accounting of the lake inputs and withdrawals we will calculate the current water demand for the lake. This water demand will form the basis for measuring performance of the proposed lake liner system. Deliverable: JS&TM will prepare a Lake Condition Assessment Report to inventory the lake facilities, document current lake conditions, identify known deficiencies and explain deficiency mitigation options. The report will also include recommended measures to mitigate identified deficiencies. The hydrogeologic recommendations will be included in the Lake Condition Assessment Report. Task 2: Water Quality Sampling and Assessment/Report JS&TM will collect a minimum of four (4) water samples from a total of two (2) locations on the same day to obtain representative samples of the average water quality in the lake. The samples will be submitted to a state certified laboratory from an unspecified source. The lab will run lake water quality tests including: Dissolved Oxygen — D 0 Nutrients —Total Nitrogen, Nitrate, Ammonia, Total Phosphorus Water Clarity —Turbidity, Color, Total Dissolved Solids Salts — Chloride, Conductivity, Hardness, Acid/Base Readings — pH, Total Alkalinity Biological Oxygen Demand — BOD The test results will be used to provide physical indicators of specific problems with the lake water quality and markers for measurement of improvement of the lake water quality after rehabilitation -of the lake. The lake water quality system will be designed to address the undesirable biological and chemical components identified in the lake water. Deliverable: Water quality sample analysis results, narrative interpretation of relevant water quality characteristics. A water quality report will be included in the Lake Condition Assessment Report. Task 3: Survey and Analysis JS&TM will prepare a detailed photogrammetric topographic survey of a portion of Carl Thornton Park. The topographic survey will be developed using a drone -mounted camera to create a 31) visual model of the current terrain and ground features. Survey control will be based on the local California Spatial Reference System (CSRS) which is the official geodetic datum in California, as published by the California Spatial Reference Center (CSRC). The local CRTN station used is based on CSRS Epoch 2017.50 (NAD83), Zone 5 and elevations based on NAVD88. All data would be processed using 3rd party software using CRTN base station data and the Post -Processing Kinematic (PPK) method for correction and accuracy. With PPK, the drone will geotag X, Y, Z coordinates to each image based on an on -board GPS unit that records positional information.. Final 1-foot contour deliverables will be in the form of a dxf file, digital terrain model and point cloud for digital model viewing and use in CAD applications. The topographic survey will be used as the base file for the construction drawings, construction plans, and exhibits prepared for the project. 1S&TM will conduct a bathymetric survey of Carl Thornton Park Lake to obtain an accurate topographic mapping of the current lake bottom to determine the current lake volume and determine the volume and location(s) of sediment accumulated on the lake bottom since construction. The bathymetric survey will be conducted in the state plan coordinate system NAD 83 CA Zone-V. The vertical datum for survey data will be NAVD88. The surveyor will set (4) Continuous Operating Reference System (COBS) control points. The survey team will establish the current lake Thornton Park Lake Circulation Study and Renovations Page 9