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<br /> <br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 163 <br />ENVIRONMENTAL ISSUES <br />Potentially <br />Significant <br />Impact <br />Less Than <br />Significant <br />with <br />Mitigation <br />Incorporated <br />Less Than <br />Significant <br />Impact <br />No <br />Impact <br />d) Would the project in flood hazard, <br />tsunami, or seiche zones, risk <br />release of pollutants due to <br />Proposed Project inundation? <br /> <br />e) Would the project conflict with or <br />obstruct implementation of a water <br />quality control plan or sustainable <br />groundwater management plan? <br /> <br /> <br />3.10.1 Environmental Setting <br />The Proposed Project will have on-land as well as over-water soil explorations. The <br />Study Area stretches over a large area spanning Alameda, Contra Costa, Sacramento, <br />San Joaquin, Solano, and Yolo Counties, with most of the borings being along rivers, <br />such as the False River, Old River, Sacramento River, San Joaquin River, and a few <br />sloughs and canals. All the Impact Areas are in or near agricultural lands with a few <br />Impact Areas that have suburban areas nearby within the Study Area. <br />All the proposed Impact Areas are in the Sacramento and San Joaquin River Basins, <br />which are under the jurisdiction of the Regional Central Valley Water Board. DWR <br />Bulletin 118-80 identifies 63 groundwater basins in the Sacramento watershed area and <br />39 groundwater basins in the San Joaquin watershed area. There are additional areas <br />not identified in the DWR Bulletin with groundwaters that have beneficial uses in the <br />Sacramento and San Joaquin watershed areas. Groundwater levels vary from 20 feet at <br />Grand Island to 200 feet at Hood near Merritt Island (DWR 2019). <br />3.10.2 Discussion <br />a) Violate any water quality standards or waste discharge requirements or <br />otherwise substantially degrade surface or groundwater quality? <br /> <br />No Impact. The Proposed Project would not violate water quality standards, waste <br />discharge requirements, or degrade surface and groundwater quality. Bentonite <br />drilling fluids are considered to have very little toxicity and are the industry standard <br />used in accordance with California regulations (Water Well Standards, DWR 74-81 <br />and 74-90). The casing of the drill apparatus is smaller than most piers and would <br />not impede water flow. The drilling rods, samplers, and other down-hole equipment <br />pass through the inside of the casing, which separates them from the water. While