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3 <br />Site Characterization Work Plan SWT Engineering <br />Z:\PROJECTS\SiteLogIQ\Site Characterization Work Plan\Text \Riverbank_Site Charac. Work Plan (Nov 2023).doc <br />Post-Disposal <br />♦ 1969 UCSB <br />♦ 1993 UCSB <br />♦ 2019 UCSB <br />♦ 2023 (May) Google Earth <br />Topographic Maps: The following available historical topographic maps were compiled and <br />reviewed from the USGS Topoview website https:www.ngmdb.usgs.gov/topoview/viewer/#1/-1/- <br />9: <br />Pre-Disposal <br />♦ 1916 <br />♦ 1953 <br />Post-Disposal <br />♦ 1969 <br />♦ 2019 <br />♦ 2021 <br />Assessor Parcel Information: Assessor Parcel Information was obtained from a Title Report <br />and in the San Joaquin County Assessor Parcel Maps website <br />(https://www.sjgov.org/department/assessor/property-information/homeowners/parcel-maps). As <br />indicated in Section 1.0, the location of the project, which is located on the south end of the <br />City of Riverbank WWTP, falls within APN 247-260-02 (see Appendix A). <br />3.0 REVIEW OF RECORDS <br />Aerial photographs included in Appendix A do not indicate a timeframe as to when disposal <br />activities may have occurred or indicate changes in site use and vegetation. The WWTP is <br />present in the 1957 aerial photograph and 1953 topographic map (both pre-disposal), and <br />by 1963 (during disposal) had expanded. Topographic maps indicate a variable shallow <br />slope area with little change in relief (up to 10-15 feet) over time. Topographic maps from <br />1916 and 1953 (both pre-disposal) show a north-northeast trending trench, which is most <br />likely a former irrigation canal at the west end of the site from 10-15 feet deep that is not <br />present in 1957 (pre-disposal). It is likely that the former canal was filled between 1953 and <br />1957 (pre-disposal). This former canal appears to be the area of waste fill and is located <br />where the 565-kW ballasted ground mount array is to be placed on the old landfill area. The <br />former canal area extends to the outside limits of the WWTP operations to Jacob Myers Park, <br />which is within the parcel boundary and owned by the City of Riverbank. Figure 3 shows the <br />approximate limits of waste of the disposal site with respect to the proposed Solar array. <br />Preliminary assumptions concerning the nature, extent, and potential threat to public health <br />and safety environment are that the Riverbank City Dump is shallow (probably <15 feet <br />deep), has limited extent, and poses a very low potential threat to public health and safety <br />and the environment. Figure 2 shows the approximate horizontal extent of the waste (i.e., <br />waste limits) within the property boundary (approximately 0.76 acres). Assuming an average