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2024 Annual Monitoring and Maintenance Report <br />Forward Landfill <br />www.arcadis.com <br />Forward Landfill 2024 Annual Monitoring & Maintenance Rpt_04012025 3 <br />grading and drainage and have not deteriorated or been significantly altered to prevent from eliminating and <br />minimizing erosion and ponding, in compliance with the requirements of the General Order (State Water Board <br />2020) and Technical Report (HDR 2021). If construction, maintenance, or repairs are necessary, they must be <br />completed by October 31. <br />In 2024, there was no evidence of areas of deficiency such as cracking or subsidence in the containment <br />structures; therefore, no corrective action was taken. The 2024 annual survey is presented in Appendix B. <br />3.1.4 Major Storm Events <br />Precipitation, diversion, and drainage facilities are inspected following a major storm event in compliance with the <br />specifications of the General Order (State Water Board 2020) and Technical Report (HDR 2021). If an any <br />damage or repairs are noted, Forward will complete repairs within 30 days of the inspection. A major storm event <br />is defined as a minimum of one inch of precipitation within 24 hours. No damage or repairs were conducted during <br />2024. <br />4 Detention Pond Monitoring <br />Detention pond monitoring is conducted quarterly by Del-Tech Geotechnical Support Services (Del-Tech), located <br />in Oakdale, California. The current monitoring network consists of one pan lysimeter and one grab sampling <br />location (compost pond; see Figure 2), from which Del-Tech collects samples when there is sufficient liquid for <br />sampling. If liquid is detected in the pan lysimeter during an inspection, the State Water Board will be notified <br />within 48 hours, and a sample will be analyzed for the monitoring parameters as stipulated in Table B-1 of the <br />MRP of the General Order (State Water Board 2020). <br />4.1 Sampling and Laboratory Analysis <br />Sampling for the detention pond was conducted in accordance with the Sampling and Analysis Plan (Appendix <br />C). During 2024, the pan lysimeter was dry. The grab sampling location was sampled in the first, second, and <br />third quarters of 2024, but the location had insufficient water for sampling in the fourth quarter of 2024. Samples <br />were collected by Del-Tech and submitted to Pace Analytical Environmental Services, a state-certified laboratory. <br />The samples were analyzed for constituents (i.e., pH, total dissolved solids, and specific conductance) as <br />stipulated in Table B-1 of the MRP of the General Order (State Water Board 2020). <br />During sample collection, field parameters were also measured, including specific conductance and pH, and <br />recorded on field data sheets (Appendix D). The raw laboratory data, certificates of analyses, and chain-of- <br />custody records related to the sampling program are provided in Appendix E. Field measurements and laboratory <br />analytical data for the detention pond are summarized in Table 1. Five-year data for the detention pond <br />constituents are provided in Appendix F. <br />5 Annual Compliance <br />This section describes any Notifications of Violations (NOVs) and any corrective action monitoring conducted at <br />the Site during 2024.