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WASTE DISCHARGE REQWMENTS ORDER NO.- 5-00-133 6 THE BURLINGTON NORTHERN AND SANTA FE RAILWAY COMPANY - BNSF STOCKTON INTERMODAL FACILITY SAN JOAQUINCOUNTY 4. Precipitation and drainage control systems shall be designed, constructed and - maintained to-accommodate the anticipated volume of precipitation and peak flows from surface runoff under 100-year;-24-hour precipitation conditions. 5.- Annually,prior to the anticipated rainy season, any necessary erosion control - measures shall be implemented, and any necessary construction,maintenance, or repairs of precipitation and drainage control facilities shall be completed to prevent erosion or flooding of the site: Class II Surface Impoundment 6. - The surface impoundment shall consists of from the top down: - a. A primary 60-mil-thick High Density Polyethylene (HDPE) geomembrane - b. A geonet drainage layer, as a Leachate Collection and Removal System (LCRS) — - c. A secondary 60-mil-thick HDPE geomembrane in lieu of the clay liner d. A pan lysimeter composed of a geonet drainage layer in lieu of a vadose zone monitoring system (VZMS) e. A tertiary 60-mil-thick HDPE geomembrane. The vadose zone monitoring system shall be capable of measuring both saturated and unsaturated flows that may occur as a result of a leak in the secondary liner. 7. _-Surface impoundments and related containment structures shall be constructed and --_maintained to prevent,to the greatest extent possible;inundation, erosion, slope failure,washout, and overtopping under 1,000-year, 24-hour precipitation conditions, and shall be designed to contain the 100-year wet season precipitation without using the required 2 feet of freeboard 8. Materials used to construct liners shall have appropriate physical and chemical properties to ensure containment of discharged wastes over the operating life, - closure, and post-closure maintenance period of the surface impoundments. 9. Materials used to construct LCRSs shall have appropriate-physical and chemical - properties to ensure the required transmission of.leachate over the life of the surface impoundments and the post-closure maintenance period. 10. LCRSs shall be designed, constructed, and maintained to collect twice the anticipated daily volume of leachate generated by each surface impoundment and to prevent the buildup of hydraulic head on the underlying liner at any time. The depth of the fluid in any LCRS sump shall be kept at the minimum needed for safe pump operation.