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6 <br />Site Characterization Work Plan SWT Engineering <br />Z:\PROJECTS\SiteLogIQ\Site Characterization Work Plan\Text\sdwrev 2-4-2024 Riverbank_Site Charac. Work Plan (Rev Feb 2024).doc <br />Data Quality Objectives (DQOs) as discussed in Appendix B. If there is no visual evidence of <br />burn dump ash, samples may be composited. <br />Soil sample(s) will be tested at a laboratory that is certified by the California Environmental <br />Laboratory Accreditation Program (ELAP) for the analyses to be performed. Any excavated <br />material for waste characterization purposes will be transported off-site to a permitted solid <br />waste facility for proper disposal or recycling. Disposal records shall be provided for all <br />waste removed from the site and will be included in the Final Site Characterization Report, <br />discussed below. Clean soil will be used to backfill. The criteria for clean soil will be <br />residential (Park soils) or industrial (WWTP property) Preliminary Remediation Goals (PRGs). <br />Procedures for verifying the adequacy of import soils will be consistent with the California <br />Department of Toxic Substance Control (DTSC) “Advisory Clean Imported Fill Material Fact <br />Sheet” (https://dtsc.ca.gov/information-advisory -clean-imported-fill-material-fact-sheet). <br />Although hazardous materials are not expected to be present based on the 2011 Category <br />“C” low threat ranking (see Appendix A), the following contingency protocol will be in-place <br />should such materials be identified during excavation (see Appendix B). Potential hazardous <br />materials may include, but are not limited to, asbestos, drums containing liquids, and <br />potentially contaminated soils with visual discoloration, or visual presence of burn ash. Any <br />indications of the presence of burn ash, odors, staining, discoloration, or contact with <br />potentially hazardous materials or asbestos, will be recorded. <br />Excavations will be backfilled with clean material. It is anticipated that the excavation <br />activities will take up to approximately 2 days to complete and the site will be secured from <br />public access. Water will be used to mitigate dust, if necessary. Appendix C is a sample <br />Health and Safety Plan, which will be updated or replaced by the contractor selected to <br />perform the field work activities. The contractors site-specific Health and Safety Plan will be <br />reviewed and approved by the LEA prior to commencement of work. <br />Prior to executing this Work Plan, the proper permits and approvals will be obtained and <br />then included in the Final Site Characterization Report. The Final Site Characterization <br />Report will be prepared to document the site characterization field work activities (along with <br />photographic documentation) and findings, as discussed above. The most recent (available) <br />topographic map showing the results of the characterization observation and findings, and <br />also delineating area(s) of disposal fill will be included in the Final Report. The Final Report <br />will be prepared under the supervision of a California Registered Civil Engineer or Certified <br />Engineering Geologist and submitted to the LEA, CalRecycle, and CVRWQCB to support the <br />PCLU Plan. <br />5.0 CLOSURE <br />This Site Characterization Work Plan will be reviewed by the appropriate regulatory agencies <br />for approval. Once approval is gained, the next steps moving forward will be coordinated <br />with the LEA, as discussed above. <br />Should you have any questions or require additional clarification, please do not hesitate to <br />contact me at 909-390-1328 or via email at mac@swteng.com. DRAFT