Agmt20 EKI Environment & Water, Inc. 2020 Urban Water Management Plan

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■ Water quality information; ■ Water level data; ■ Aquifer testing and/or percolation testing results; and ■ Estimates of aquifer recharge and discharge. Subtask 2.2 Identify Areas of Potential Groundwater Production Opportunity Based on information collected under Subtask 2.1, Consultant will perform an initial assessment of the local aquifer characteristics and conduct a high-level evaluation of groundwater supply opportunities and constraints within the City based on relevant information, including the following: ■ Location of highest yielding sediments based on available hydrogeologic information, including the thickness and permeability of underlying alluvial sediments; ■ Average well yield of wells located within and near the City; ■ Anticipated water quality based on historical total dissolved solids concentrations and other water quality data available from nearby groundwater sampling sites; ■ Proximity to the City's potable water distribution system; ■ Distance from existing production wells; and ■ Distance from known shallow soil and groundwater contaminated sites (e.g., as identified on GeoTracker database). Consultant will include maps showing general areas of potential opportunity (i.e., relatively high yield portions of the aquifer) and constraints (i.e., areas of known contamination or locations of other production wells). Consultant will also compare local groundwater quality data to drinking water requirements and evaluate whether water treatment will likely be needed. Subtask 2.3 Evaluate Potential Production Rates and Effects of Increased Groundwater Use Using the result of Subtask 2.2, Consultant will employ the San Mateo Plain Groundwater Model (SMPGWM), developed as part of the San Mateo Plain Subbasin Assessment, to assess the potential yield and effects of increased groundwater use within the City. Consultant will employ SMPGWM to evaluate the magnitude and distribution of drawdown at the potential pumping well, as well as potential influences of surface water features, contamination sites, and/or interferences with existing and planned extraction wells. The SMPGWM will also be applied to estimate a sustainable production rate that can be achieved without observing significant adverse impacts to groundwater conditions within the City and the basin. Subtask 2.4 Identify Regulatory Constraints and Develop Conceptual Project Costs REV: 10-14-2020 MI ATTY/AGR.2020.240/EKI Environment & Water, Inc. (Page 13 of 21)