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<br /> <br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 208 <br />Department of Water Resources- Routine Maintenance of Delta Levees Program <br />Setback Levee Habitats <br />A Notice of Exemption (NOE) was filed on September 19, 2019 to cover routine <br />maintenance of the southwest sides of Sherman (RD341) and Twitchell (RD 1601) <br />Islands, located in Sacramento County. Anticipated work includes the control of non- <br />native invasive plants and replanting with natives for fish, wildlife and recreation <br />benefits. <br /> <br />Department of Water Resources- Environmental Permitting for Operations and <br />Maintenance (EPOM) <br />DWR conducts operation and maintenance of multiple facilities of the federal flood <br />control project within the Central Valley of CA. DWR conducts on-going maintenance <br />activities on levees, channels, and appurtenant structures that are part of the <br />Sacramento River Flood Control Project (SRFCP). DWR prepared the EIR to implement <br />mandated maintenance activities associated with maintaining the proper functioning of <br />flood control facilities in accordance with their original design. Maintenance work is <br />sporadic and varies in location and timing. Most of the EPOM work is north of the <br />proposed Study Area but it is possible that some work will occur in the northern portion <br />of Study Area in Sacramento County. <br /> <br />The Environmental Impact Report (EIR) for EPOM was filed on September 19, 2017. <br />The EIR was finalized and Notice of Determination (NOD) was filed on January 5, 2018. <br />3.21.2.3 Point and Non-Point Source Pollution <br />Adverse effects to designated critical habitat for Delta Smelt, Central Valley spring-run <br />Chinook Salmon and Central Valley steelhead and proposed critical habitat for the <br />Southern DPS Green Sturgeon may result from point and non-point source pollution <br />(i.e. stormwater and/or irrigation discharges) which change the balance of important <br />habitat constituents (i.e. salinity, turbidity, and water temperature, etc.) within the Study <br />Area. <br />3.21.2.4 Oil and Gas Product Discharges <br />The introduction of contaminants from oil and gasoline product discharges as a result of <br />on-going commercial and private shipping and boating within the Study Area is <br />expected to continue. Implicated as potential stressors to aquatic species, these <br />contaminants may adversely affect reproductive success and/or survival. <br />3.21.2.5 Invasive Species <br />Invasive species introductions are also expected to continue although it is difficult to <br />predict the types of species introduced and the magnitude of the effects. Adverse <br />effects from these introductions may include changes in water quality (i.e. turbidity), <br />reductions in food supply, competition for space, and predation.