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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-00XX 14 <br />FORWARD, INC. <br />FORWARD LANDFILL <br />SAN JOAQUIN COUNTY <br />freshwater habitat (COLD); wildlife habitat (WILD); and spawning, reproduction <br />and/or early development (SPAWN). <br />38.Groundwater underneath the Facility is first encountered between approximately <br />60 and 80 feet below ground surface (bgs). Groundwater elevations range <br />between -14 and -30 feet MSL. The depth to groundwater fluctuates seasonally <br />as much as 10 feet. Groundwater is unconfined. <br />39.The direction of groundwater flow is generally toward the north-northeast. The <br />estimated average groundwater gradient is approximately 0.002 feet per foot. <br />The estimated average groundwater velocity is 195 feet per year. <br />40.According to the Basin Plan, the designated beneficial uses of groundwater at <br />the Facility are municipal and beneficial use (MUN), agricultural supply (AGR), <br />industrial service supply (IND), and industrial service supply (PRO). <br />41.According to previous WDRs adopted in 2003 and 2014, there are 35 domestic, <br />industrial, and agricultural supply wells within one mile of the Facility. These <br />WDRs require the Discharger to submit an updated sensitive receptor survey. <br />See Table 17, Item 6. <br />42.Class III WMUs must be designed and constructed to withstand a maximum <br />probable earthquake (MPE), whereas Class II WMUs must withstand a maximum <br />credible earthquake (MCE) (Title 27, sec. 20370). The Discharger's site-specific <br />seismic analysis indicates that an earthquake occurring along the Great Valley <br />Fault, at a closest rupture distance of 20 miles southwest of the site, would result <br />in the events summarized in Table 2. <br />Table 2—Seismic Analysis <br />Earthquake Magnitude Peak Ground <br />Acceleration <br />Return <br />Period <br />Max Credible <br />(MCE) <br />6.7 0.13 g 1,000 <br />Years <br />Max Probable <br />(MPE) <br />6.4 0.09 g 1,000 <br />Years <br /> See Glossary for definitions of terms and abbreviations in table. <br />43.Based on data from the nearest weather station (Stockton weather station <br />number B00-8560), the Facility has an annual average precipitation of 14.27 <br />inches, and a mean pan evaporation of 78.43 inches per year as measured from