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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-00XX 31 <br />FORWARD, INC. <br />FORWARD LANDFILL <br />SAN JOAQUIN COUNTY <br />Year TDS (mg/L) <br />Nitrate as N <br />(mg/L)Fe (ug/L)Mn (ug/L) <br />2016 633 9.5 ---- <br />2017 585 9 ---- <br />2018 688 13.8 15 2 <br />2019 653 9.7 ---- <br />2020 573 6.9 ---- <br />2021 493 4.8 ---- <br />2022 443 3.8 ---- <br />2023 425 1.8 < 30 < 4 <br />Potential WQO <br />500/1,000 <br />(sMCL/sMCL <br />upper) <br />10 (MCL)300 (sMCL)50 (sMCL) <br />103.Average concentrations of TDS in AMW-44, AMW-45, and AMW-46 are over the <br />sMCL of 500, but within range of the upper sMCL of 1,000 mg/L. Comparatively, <br />AMW-14 located further downstream of the cannery waste has been currently <br />under the sMCL of 500 from 2020 to 2023. <br />104.Average concentration of nitrate as N in AMW-44, AMW-45, and AMW-46 ranges <br />between 9.5 and 10.8 mg/L and hovers around the MCL of 10 mg/L, except for <br />the first and second quarter of 2023 for AMW-46. Comparatively, the average <br />concentration of nitrate as N in AMW-14 located further downstream of the <br />cannery waste has seen a decrease in nitrate concentration after 2018. <br />105.Given the limited data points for Fe and Mn in AMW-44, AMW-45, AMW-46, and <br />AMW-14, a trend can not be established. However, given the data that was <br />supplied concentrations of these metals do not exceed the sMCL levels, except <br />for Mn in the year 2020. In order to properly monitor Fe and MN, the Discharger <br />will need to sample these constituents as outlined in MRP R5-2023-XXXX. <br />106.In general, the groundwater monitoring constituent concentrations for TDS and <br />nitrate as N show a stable trend since implementing the 2017 Nutrient <br />Management Plan. Based on the data from AMW-14, nitrate is showing a <br />decrease in concentration. <br />Salt and Nitrate Control Program Reopener <br />107.On 31 May 2018, the Central Valley Water Board adopted Basin Plan <br />amendments incorporating the Salt Control Program (SCP) and Nitrate Control <br />Program (NCP). The State Water Board conditionally approved the amendments <br />on 16 October 2019 (State Water Board Resolution 2019-0057). The effective