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WASTE DISCHARGE REQUIREMENTS ORDER NO , 4 THE BURLINGTON NORTHERN AND SANTA FE RAILWAY COMPANY BNSF STOCKTON INTERMODAL FACILITY SAN JOAQUIN COUNTY there are no significant differences in the characteristics of already approved liners and the liner proposed for the BNSF Intermodal Facility. Class II Surface Impoundments 24 . The Discharger proposes an engineered alternative to the prescriptive liner requirements of Title 27 for the Class II Surface Impoundment. The engineered alternative 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-milAhick HDPE geomembrane in lieu of the clay liner d. A geonet drainage layer as a vadose zone monitoring system (VZMS) e . A tertiary 60-mil-thick HDPE geomembrane . 25 . The surface impoundment will have a geonet LCRS blanket across the entire area of the pond. The LCRS sump will be constructed of a gravel collection area and will have the capacity to store a minimum of 1 ,481 gallons , more than twice the maximum anticipated daily volume of leachate . Liquids removed from the LCRS will be returned to the surface impoundment . The sump includes with a high level alarm, if liquids trigger the level alarm the sump will be pumped out . 26 . The Discharger proposes a pan lysimeter (geonet blanket) under the entire area of the pond as an engineered alternative to the prescriptive unsaturated zone monitoring system requirements of Title 27 Section 20415 (d) . The surface impoundment vadose zone monitoring system (VZMS) will consists of a geonet blanket across the entire area of the pond . The VZMS sump will be constructed of a gravel collection area and will have the capacity to store 449 gallons . Any liquids that are detected in the VZMS sump will be removed and returned to the surface impoundment. The sump will include a high-level alarm, if liquids trigger the level alarm the sump will be pumped out. CEQA AND OTHER CONSIDERATIONS 27 . The San Joaquin County Community Development Department certified the final environmental impact report for the facility on 23 September 1999 . The Regional Board considered the environmental report in writing these WDRs . 28 . This Order implements : a. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basin Fifth Edition ; b . The prescriptive standards and performance goals of California Code of Regulations, Title 27 , Division 2 . effective 18 July 1997 , and subsequent revisions .