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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-00XX 29 <br />FORWARD, INC. <br />FORWARD LANDFILL <br />SAN JOAQUIN COUNTY <br />downgradient well located approximately 775 feet northeast of the land <br />application area. Well construction details are shown below. <br />Table 8—Well Construction Details <br />Monitoring <br />Well <br />Well Depth <br />(feet bgs) <br />Screen Interval <br />(feet bgs) <br />Installation <br />Year <br />AMW-44 78 58-78 2020 <br />AMW-45 80 58-78 2020 <br />AMW-46 80 58-78 2020 <br />AMW-14 108.5 75-100 1995 <br />102.A summary of the groundwater monitoring data for selected constituents for <br />downgradient wells AMW-44, AMW-45, AMW-46, and AMW-14 is presented <br />below. For groundwater monitoring wells AMW-44, AMW 45, and AMW-46, <br />annual average concentrations for 2020 to 2023 are shown for TDS and nitrate <br />as N. For AMW-14, annual concentrations of TDS and nitrate as N were taken <br />from 2005 to 2023. For all analyzed wells, Fe and Mn samples were taken at first <br />installation of the well and at five-year intervals (i.e. 2008, 2013, 2018, 2023). <br />Non-detect samples were reported as half the method detection limit for <br />averaging purposes. <br />Table 9—AMW-44 Groundwater Quality <br />Year TDS (mg/L) <br />Nitrate as <br />N (mg/L) <br />Fe <br />(ug/L) <br />Mn <br />(ug/L) <br />2020 610 10 15 2 <br />2021 563 10.8 ---- <br />2022 578 10.8 ---- <br />2023 575 9.5 < 30 < 4 <br />Potential <br />WQO <br />500/1,000 <br />(sMCL/sMCL <br />upper) <br />10 (MCL)300 <br />(sMCL) <br />50 <br />(sMCL)