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ekienvironment <br /> & water <br /> 2023 Spring Groundwater Monitoring Report <br /> Consolidated Treatment Facility <br /> Order No. 115-2018-0023 <br /> Monitoring and Reporting Program R5-2016-0028-03 <br /> Table of Contents <br /> 1 INTRODUCTION ....................................................................................................1 <br /> 2 GROUNDWATER MONITORING ACTIVITIES............................................................1 <br /> 2.1 Groundwater Level Measurements..................................................................... 2 <br /> 2.2 Sample Collection and Analysis ........................................................................... 2 <br /> 3 GROUNDWATER MONITORING RESULTS...............................................................5 <br /> 3.1 Groundwater Elevations, Flow Directions, and Hydraulic Gradients.................. 5 <br /> 3.2 Groundwater Analytical Results ........................................................................ 11 <br /> 3.2.1 Total Coliform......................................................................................... 12 <br /> 3.2.2 TDS......................................................................................................... 13 <br /> 3.2.3 Nitrate as N............................................................................................ 13 <br /> 4 LABORATORY REPORTS....................................................................................... 14 <br /> FIGURES <br /> Figure 1. Consolidated Treatment Facility and Associated Monitoring Areas <br /> Figure 2. Monitoring Wells and Significant Features <br /> Figure 3. Groundwater Elevation Contours, 2023 Spring Monitoring Event <br /> TABLES <br /> Table 1. Compliance Well Sample Dates, Well Casing Volumes, and Number of Casing <br /> Volumes Purged, 2023 Spring Monitoring <br /> Table 2. Monitored Parameters, Constituents, Meters, and Analytical Methods <br /> Table 3. 2023 Spring Groundwater Elevations <br /> Table 4. Hydraulic Gradients and Azimuth in the Vicinity of Selected Monitoring Wells <br /> Table 5. 2023 Spring Sampling Results <br /> APPENDICES <br /> Appendix A. Field Sheets and Purge Logs <br /> Appendix B. Historical Water Levels <br /> Appendix C. Historical Water Quality Results <br /> Appendix D. Quality and Assurance and Control Assessment <br /> City of Lathrop i 13 July 2023 <br /> EKI B90088.03 <br />