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2 <br /> <br /> <br /> <br />(209-235-9622 (o) <br />ocordero@republicservices.com <br /> <br /> San Joaquin County Environmental Health Department and RWQCB notices of violation related to the <br />landfill cover were issued during the reporting period. The violations were resolved in a timely manner, <br />and there are no outstanding violations at the Site with regard to landfill cover. <br /> The groundwater monitoring well network was expanded, particularly on the CDCR facility. The <br />individual contaminant of concern concentrations and TVOC concentrations were assessed, with the <br />highest TVOC concentrations indicated on the CDCR property. To comply with Cleanup and Abatement <br />Order R5-2017-0703, additional remedial corrective action measures are planned, which will include <br />the installation of a groundwater treatment system and control measures applied to the offsite plume <br />on the CDCR property by groundwater extraction. The installation of this groundwater extraction and <br />treatment system is required to address the outstanding notice of violation of the Cleanup and <br />Abatement Order; however, once the system is implemented, it will also serve to satisfy the <br />requirements of the corrective action program. <br />Revisions to the Enclosed Report (2025 Annual Corrective Action Evaluation Report) <br />The current Monitoring and Reporting Program is now specified in the 2024 Order, which was finalized on <br />February 16, 2024, and supersedes Order No. R5-2014-0006. Following the implementation of the 2024 <br />Order, the Site will no longer be separated by landfill units in reporting. The annual corrective action report <br />previously reported on wells associated with the Austin Road Unit. Beginning with this enclosed report, data <br />from all site groundwater monitoring wells are included and the language in the document has been revised <br />to more clearly outline compliance with the 2024 Order. <br />Document Revisions for 2026 <br />The 2025 Annual Corrective Action Evaluation Report is based on the 2001 engineering feasibility study. <br />Since the generation of this annual report and the 2001 engineering feasibility study, the monitoring well <br />network has been expanded. In the 2026 Annual Corrective Action Evaluation Report, the TLs and the <br />corrective action wells under evaluation will be updated. This letter proposes the following updates to the <br />forthcoming 2026 Annual Corrective Action Evaluation Report: <br /> The following updates to the corrective action wells are proposed: <br />o Replace well AMW-1 (in the POC capture zone and not representative of downgradient conditions) <br />with wells AMW-40S and AMW-40M (outside but immediately downgradient of the POC capture <br />zone); <br />o Remove well AMW-10 (due to its abandonment in third quarter 2018) and add wells AMW-43S and <br />AMW-43M as replacements (outside but immediately downgradient of the POC capture zone); <br />o Remove well AMW-4 (in the POC capture zone and not representative of downgradient conditions) <br />and add wells AMW-41S, AMW-41M, AMW-42S, and AMW-42M (each immediately downgradient <br />of the POC capture zone). <br /> The TLs will be recalculated for the new corrective action monitoring well network and a new TVOC <br />mass TL will be generated for the Site. <br /> The contents of the report will be revised to provide details on the new corrective action wells and new <br />TLs. <br />