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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-OOXX 28 FORWARD, INC. FORWARD LANDFILL SAN JOAQUIN COUNTY are considered to be downgradient wells and are located directly north of the land application area. 98. Constituents of concern that have the potential to degrade groundwater at the land application area include Total Kjeldahl Nitrogen (TKN), nitrate (NO3), nitrite (NO2), nitrogen (N), iron (FE), arsenic (As) and manganese (Mn). a. For metals such as iron and manganese, the waste is not expected to contain significant concentrations. However, as noted in Finding 90, excessive BOD loading rates can deplete oxygen, resulting in anoxic conditions that can solubilize naturally occurring metals in the soil. Based on the depth of shallow groundwater and BMPs that this Order requires, degradation of shallow groundwater with metals due to reducing conditions is not expected to occur and this Order does not allow degradation of groundwater with metals. 99. Based on historical groundwater data, concentrations of total dissolved solids (TDS), NO2, Total Mn, Total As, and Total Fe provided groundwater data that were less than applicable WQOs (see Table 6). Therefore, groundwater quality is considered high quality for these constituents for the purpose of the Antidegradation Policy. The groundwater monitoring wells presented in Finding 97 do not provide sufficient concentration data for Total N, TKN, and nitrite to be used in this analysis. 100. A summary of groundwater monitoring data for selected constituents is presented in Table 6. Mean concentrations, where applicable, were determined with the given available data on Geotracker: Table 6—Groundwater Quality Data AMW- AMW- AMW- AMW- AMW- AMW- WQO Constituent Units 37S 40S 41S 44 45 46 (UG) (UG) (UG) (DG) (DG) (DG) (reference) TDS mg/L 313 314 519 571 535 570 450 (from Basin Plan) Total N mg/L NA NA NA NA NA NA 10 TKN mg/L NA NA NA NA NA NA None