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<br />Soil Investigations for Data Collection in the Delta <br />Initial Study/Proposed Mitigated Negative Declaration 138 <br />3.5.2 Discussion <br />a) Would this project cause a substantial adverse change in the significance of a <br />historical resource pursuant to section 15064.5? <br /> <br />Less than Significant with Mitigation Incorporated. The Proposed Project as <br />designed would not cause a substantial adverse change in the significance of a <br />historical resource pursuant to Section 15064.5 of the CEQA guidelines. Of the <br />locations in the Study Area previously studied, amounting to approximately 22% of <br />the Study Area, the majority of the locations have no known historical resources. <br />There are five previously recorded historical resources (P-07-004698, P-34-001497, <br />P-34-002102, P-34-002143, P-57-000596) that overlap with 34 Impact Areas. Of <br />these 34 Impact Areas, 31 are boring units and three are CPT units. The CPT units <br />overlap with P-34-001497 and P-39-004492 exclusively. <br /> <br />Impact Areas that would be located on top of or near a levee feature would have no <br />substantial adverse change the resource, and due to the limited nature of the <br />Proposed Project activities, important aspects of a levee’s or railroad alignment’s <br />integrity or characteristics that depends on environmental factors around the feature <br />(specifically categories of setting, feeling, location, and design) would not be <br />significantly damaged. <br /> <br />No soil exploration would occur on top of recorded structures/features or in a spot <br />that would impact structural integrity of those resources, and incorporation of <br />mitigation measure MM BIO-1 ensures that no trees would be damaged. For known <br />recorded historical resources, as well as the remaining 78% of the Study Area that <br />has not undergone previous field studies, incorporation of mitigation measures MM <br />CUL-1, CUL-2, CUL-3, and CUL-4 (below) would further reduce potential effects to <br />previously unidentified historical resources to a less than significant level. <br /> <br /> <br />MM CUL-1: <br />a. All soil investigation locations would be reviewed by a qualified archaeologist <br />to evaluate the potential for impacts, if any, to cultural resources. <br />b. Locations that have no previous survey coverage must be surveyed by, or <br />under the direct supervision of a qualified archaeologist prior to the start of <br />any ground disturbing activities. <br /> <br />oak groves and <br />riparian habitat <br />(Peirce 2017; Scher et al. <br />2018) <br />P-57-000596 Historic Tree Rows Unevaluated