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1 <br />Site Characterization Work Plan SWT Engineering <br />Z:\PROJECTS\SiteLogIQ\Site Characterization Work Plan\Text\Riverbank_Site Charac. Work Plan (Feb 2024)_Final.doc <br />SWT Engineering (SWT) is pleased to present the Site Characterization Work Plan (Work <br />Plan) (dated July 2023, Revised September 2023, November 2023, and February 2024) to <br />the regulatory agencies identified below in support of a proposed Solar Panel Project on the <br />closed Riverbank City Dump (SWIS No. 39-CR-0029). This Work Plan has been revised to <br />address comments from the San Joaquin County Environmental Health Department, acting <br />as the Local Enforcement Agency (LEA). <br />Objective: This Work Plan outlines the field work activities to be conducted as part of the <br />investigation to: 1) determine the approximate horizontal and vertical extents of the disposal <br />site, and 2) to characterize the content of the fill (as Resource Conservation and Recovery <br />Act (RCRA) hazardous, California Hazardous, or non-hazardous waste). <br />Section 4.0 of this Work Plan includes activities to be conducted to characterize site <br />conditions in order to determine the horizontal and vertical extent of waste and the <br />character of wastes present, estimate volume of waste in place, and the levels/extent of <br />contaminated soil, if any. <br />1.0 BACKGROUND <br />The entire 657 kW project consists of one 92.365-kW carport that is to be constructed over <br />an area that was not used as a landfill and one 565-kW ballasted ground mount array to be <br />placed on the old landfill area (Figure 1). As part of this proposed solar panel project, there <br />will be no need to remove waste from the site nor disturbance of in-place waste. The entire <br />system would be located on the south end of the City of Riverbank Wastewater Treatment <br />Plant (WWTP) property and potential disposal area (review of records section below), north <br />of the Stanislaus River (Figure 2). The WWTP is owned and operated by the City of <br />Riverbank. <br />The effected parcel showing the site is listed from the County of San Joaquin Assessor’s <br />parcel map register as Assessor’s Parcel Number (APN) 247-260-02 (see Appendix A). In <br />addition, the effected property’s title report is also included in Appendix A. <br />The Riverbank City Dump (Site) is a closed solid waste disposal site (approximately two <br />acres in size) subject to California Department of Resources Recycling and Recovery <br />(CalRecycle) regulations and is inspected periodically by the San Joaquin County Local <br />Enforcement Agency (LEA) for compliance with applicable State Minimum Standards. The <br />Solar Panel Project will require a Postclosure Land Use (PCLU) Plan to be submitted to the <br />San Joaquin County LEA and the Central Valley Regional Water Quality Control Board <br />(CVRWQCB) for review and approval. Prior to submitting a PCLU Plan, this Site <br />Characterization Work Plan needs to be submitted and approved by the regulatory agencies <br />before moving forward with the intrusive investigation/field work activities. <br />As part of a meeting held with the LEA in June 2023, the LEA indicated that the first step in <br />this project would be preparation and submittal of a Work Plan to conduct field work <br />activities for Site Characterization of the closed Riverbank City Dump to the regulatory <br />agencies (i.e., LEA, CalRecycle, and CVRWQCB). In late August 2023, the LEA provided <br />comments on the July 2023 Work Plan and as a result, the document was revised in <br />September 2023 and re-submitted to the regulatory agencies. The LEA issued a second <br />round of comments in September 2023 and the document (dated November 2023) was <br />revised. In December 2023, a third round of comments was provided by the LEA with