ARCHIVED REPORTS_JULY 2014 FINAL RCSI

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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2014-0006 -11- FORWARD INC. AND REPUBLIC SERVICES INC. FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY 36. Based on a site-specific seismic analysis, the controlling maximum credible earthquake (MCE) for the site is a moment of magnitude 6.4 event along the Great Valley Fault at a closest rupture distance of 21 miles (34 kilometers) from the site. It is estimated that a MCE event would produce a peak ground acceleration of 0.13 g at the site. 37. The facility receives an average of 13.31 to 14.35 inches of precipitation per year as measured at the site. The mean pan evaporation is 78.43 inches per year as measured at the Oakdale Woodward Dam Station. 38. The 1,000-year, 24-hour precipitation event for the facility is estimated to be 4.11inches, based on California Department of Water Resources’ bulletin 195 entitled Rainfall Depth- Duration-Frequency for California, revised November 1982, updated August 1986. 39. The waste management facility is not within a 100-year flood plain based on the US Dept. of Housing and Urban Development, National Flood Insurance Rate Map, October 2009. 40. Storm water sedimentation basins are located west of the landfill as shown on Attachment B. The basins detain storm water for sedimentation control during the rainy season and are normally dry during the summer months. Storm water from the sedimentation basins is typically evaporated but may be discharged to North or South Forks of South Littlejohns Creek. SURFACE WATER AND GROUNDWATER CONDITIONS 41. The Water Quality Control Plan for Sacramento and San Joaquin River Basins, Fourth Edition (hereafter Basin Plan), designates beneficial uses, establishes water quality objectives, and contains implementation plans and policies for all waters of the Basin. 42. Surface water drainage from the northern half of the site is to the North Fork of South Littlejohns Creek; drainage from the southern half flows to the South Fork of South Littlejohns Creek thence to Littlejohns Creek in the Duck-Littlejohns Hydrologic Area (31.40) of the San Joaquin River Basin. 43. The designated beneficial uses of Littlejohns Creek as specified in the Basin Plan, are municipal and domestic supply; agricultural supply; water contact recreation; non-contact water recreation; commercial and sport fishing; warm fresh water habitat; cold freshwater habitat; wildlife habitat; preservation of biological habitats of special significance; migration of aquatic organisms; and spawning, reproduction, and/or early development. 44. The first encountered groundwater ranges from about 60 feet to 80 feet below the native ground surface. Groundwater elevations range from about -14 feet to -30 feet below the mean sea level (BMSL). The depth to groundwater fluctuates seasonally as much as 10 feet. Groundwater is unconfined.