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i <br /> WASTE DISCHARGE K UIREMENTS ORDER NO . 6 <br /> THE BURLINGTON NORTHERN AND SANTA FE RAILWAY COMPANY <br /> BNSF STOCKTON INTERMODAL FACILITY <br /> SAN JOAQUIN COUNTY <br /> inundation or washout due to. flooding events with a 100-year return period . <br /> 4 . Precipitation and drainage control systems shall be designed, constructed and <br /> maintained to accommodate the anticipated volume of precipitation and peak flows <br /> from surface runoff under 100-year, 24-hour precipitation conditions . <br /> 5 . Annually, prior to the anticipated rainy season, any necessary erosion control <br /> measures shall be implemented, and any necessary construction, maintenance, or <br /> repairs of precipitation and drainage control facilities shall be completed to prevent <br /> erosion or flooding of the site. <br /> Class II Surface Impoundment <br /> 6 . The surface impoundment shall consists of from the top down : <br /> a. A primary 60 -mil4hick High Density Polyethylene (HDPE) geomembrane <br /> b . A geonet drainage layer, as a Leachate Collection and Removal System <br /> (LCRS ) <br /> c . A secondary 60-mil-thick HDPE geomembrane in lieu of the clay liner <br /> d . A pan lysimeter composed of a geonet drainage layer in lieu of a vadose zone <br /> monitoring system (VZMS ) <br /> e . A tertiary 60-mil-thick HDPE geomembrane . <br /> The vadose zone monitoring system shall be capable of measuring both saturated <br /> and unsaturated flows that may occur as a result of a leak in the secondary liner. <br /> 7 . Surface impoundments and related containment structures shall be constructed and <br /> maintained to prevent, to the greatest extent possible, inundation, erosion, slope <br /> failure, washout, and overtopping under 1 , 000-year, 24-hour precipitation <br /> conditions, and shall be designed to contain the 100-year wet season precipitation <br /> without using the required 2 feet of freeboard <br /> 8 . Materials used to construct liners shall have appropriate physical and chemical <br /> properties to ensure containment of discharged wastes over the operating life, <br /> closure, and post-closure maintenance period of the surface impoundments . <br /> 9 . Materials used to construct LCRSs shall have appropriate physical and chemical <br /> properties to ensure the required transmission of leachate over the life of the surface <br /> impoundments and the post-closure maintenance period. <br /> 16 . LCRSs shall be designed, constructed, and maintained to collect twice the <br /> anticipated daily volume of leachate generated by each surface impoundment and to <br /> prevent the buildup of hydraulic head on the underlying liner at any time . The <br />