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DRAFT [TENTATIVE] WASTE DISCHARGE REQUIREMENTS ORDER R5-2023-OOXX 14 FORWARD, INC. FORWARD LANDFILL SAN JOAQUIN COUNTY Facility, O.H. Close Youth Correctional Center, Youth Authority Department, California Health Care Facility and Delta Center California Conservation Corps are approximately one mile to the north. The BNSF Intermodal Facility is approximately one mile to the northeast. There are seven residences within one half mile of the landfill, two on Austin Road and five on Newcastle Road. See Attachment I for a 1,000 feet radius and land use map. 38. Surface water from the Facility drains to North and South Fork Branches of South Littlejohn Creek, a tributary to San Joaquin River. According to the Central Valley Water Board's Water Quality Control Plan for the Sacramento and San Joaquin River Basins (Basin Plan), the beneficial uses of Duck-Littlejohns Hydrologic Area (31.40) include: municipal and domestic use (MUN); agricultural supply (AGR); industrial process supply (PRO); water contact recreation (REC-1); non- water contact recreation (REC-2); warm freshwater habitat (WARM); cold freshwater habitat (COLD); wildlife habitat (WILD); and spawning, reproduction and/or early development (SPAWN). 39. Groundwater underneath the Facility is first encountered between approximately 60 and 80 feet below ground surface (bgs). Groundwater elevations range between -14 and -30 feet mean sea level (MSL). The depth to groundwater fluctuates seasonally as much as 10 feet. Groundwater is unconfined. 40. The direction of groundwater flow is generally toward the north-northeast. The estimated average groundwater gradient is approximately 0.002 feet per foot. The estimated average groundwater velocity is 195 feet per year. 41. According to the Basin Plan, the designated beneficial uses of groundwater at the Facility are municipal and beneficial use (MUN), agricultural supply (AGR), industrial service supply (IND), and industrial service supply (PROC). 42. According to previous WDRs adopted in 2003 and 2014, there are 35 domestic, industrial and agricultural supply wells within one mile of the Facility. These WDRs require the discharger to submit an updated sensitive receptor survey. See Table 11, Item 6. 43. Class III WMUs must be designed and constructed to withstand a maximum probable earthquake (MPE), whereas Class II WMUs must withstand a maximum credible earthquake (MCE) (Title 27, section 20370). The Discharger's site-specific seismic analysis indicates that an earthquake, occurring along the Great Valley Fault, at a closest rupture distance of 20 miles southwest of the site, would result in the events summarized in Table 2.