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WASTE DISCHARGE REQUIREMENTS ORDER R5-2015-0058-01 -10- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOOTHILL SANITARY LANDFILL, INC. FOOTHILL LANDFILL SAN JOAQUIN COUNTY 44. The maximum probable earthquake (MPE) for the site is estimated to be about 6.5 on the Richter scale based on the 1892 Vacaville/Winters earthquake in the Great Valley Thrust Zone noted above. A maximum magnitude earthquake of 6.5, occurring a mean distance of 41 miles from the site was computed based on an aerially- distributed hazard in the Foothills Fault System.3 The corresponding peak horizontal ground acceleration computed using this model was 0.14 g. Also see Information Sheet. 45. Class II WMUs must be designed and constructed to withstand a maximum credible earthquake (MCE) (Title 27, § 20370). The Discharger’s site-specific seismic analysis indicates that an earthquake occurring along the Great Valley 7 fault, at a closest rupture distance of 59.33 miles, would result in magnitude 6.9 with a peak horizontal ground acceleration of 0.14 g. SURFACE WATER CONDITIONS 46. The site is about 1.5 miles south of the Calaveras River and 4 miles east of Mormon Slough, which branches off from the Calaveras River near Bellota about 3.5 miles northwest of the site. Surface drainage from the site flows into a network of streams and creeks that meander toward the southwest, ultimately emptying into Mormon Slough at two points near Linden and east Stockton, respectively. Mormon Slough is partially tributary to the Stockton Diverting Canal, which drains into the Calaveras River, a tributary of the San Joaquin River. The remainder of Mormon Slough flows directly into the San Joaquin River in Stockton. The San Joaquin River discharges into the Sacramento-San Joaquin River Delta northwest of Stockton. See Attachment A: Location Map. 47. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Edition (hereafter Basin Plan) designates beneficial uses; establishes water quality objectives; contains implementation plans and policies for protecting waters of the basin; and incorporates by reference, plans and policies adopted by the State Water Resources Control Board. 3. Maximum magnitude earthquake derived from probabilistic seismic hazard (PSH) de-aggregation analysis assuming an earthquake in the Foothills Fault System with a 475-year return period (10% chance in 50 years).