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Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 148 Less than Significant Impact. The footprint of each Impact Area is small (only includes the soil investigation site itself and the area required for parking for field personnel), temporary, and would not involve significant alterations to the topsoil (only the soil borehole/CPT hole itself would affect topsoil). While there would be a less than significant impact to soil erosion or the loss of top soil, implementation of Mitigation Measures MM AES-1 and AGR-1 would further avoid, minimize and/or reduce the potential for impacts. c) Would the project be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction, or collapse? No Impact. DWR geologists considered the suitability of the geologic units for soil investigation in their siting of proposed Impact Areas. If the soil is deemed unstable by a geologist during the reconnaissance site visits required as part of the Proposed Project, or at any time thereafter, the Impact Area will be moved to decrease potential of on- or off-site landslide, lateral spreading, subsidence, liquefaction, or collapse. Because the Proposed Project requires avoidance of these types of risks/impacts, no impact is anticipated as a result of the Proposed Project. d) Would the project be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994, as updated), creating substantial direct or indirect risks to life or property? No Impact. Expansion and contraction of volume can occur when expansive soils undergo alternating cycles of wetting (swelling) and drying (shrinking). During these cycles, the volume of the soil changes. Expansive soils are common throughout California and can cause damage to foundations and slabs unless properly treated during construction. The Proposed Project does not include the construction of any structures that, when built on expansive soils, may result in direct or indirect risk to life or property. While there would be no impact, implementation of Mitigation Measures MM AES-1 and AGR-1 would further avoid, minimize and/or reduce the potential for impacts. e) Would the project have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? No impact. Septic tanks and alternative wastewater disposal systems would not be installed on the Impact Areas. Therefore, no impact is anticipated as a result of the Proposed Project. f) Would the project directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? No impact. There are no known unique paleontological resources or sites or unique geologic features within the Impact Areas that would be directly or indirectly destroyed during work or from work completed. While there are no current maps that