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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0123 -3- H.M. HOLLOWAY, INC. H.M. HOLLOWAY SURFACE MINE LANDFILL PROJECT KERN COUNTY the east. No surface springs or other sources of groundwater supply have been observed. SURFACE AND GROUND WATER CONDITIONS 15.The Water Quality Control Plan for the Tulare Lake Basin, Second Edition, revised January 2004 (hereafter Basin Plan), designates beneficial uses, establishes water quality objectives, and contains implementation plans and policies for all waters of the Basin. 16.Surface drainage is toward an unnamed creek in the Lost Hills in the Antelope Plain Hydrologic Area (558.60) of the Tulare Lake Basin. Surface waters in the Antelope Plain Hydrologic Area are designated as Valley Floor Waters in the Basin Plan. 17.The Units are on the floor of the southern San Joaquin Valley. The designated beneficial uses of the Valley Floor Waters, as specified in the Basin Plan, are agricultural supply; industrial service and process supply; water contact and non- contact water recreation; warm freshwater and wildlife habitat; preservation of rare, threatened, and endangered species; and groundwater recharge. 18.The facility is in the Kern County Basin Hydrologic Unit, Detailed Analysis Unit (DAU) 259. The designated beneficial uses of the groundwater, as specified in the Basin Plan for DAU 259, are municipal and domestic water supply, agricultural supply, and industrial service supply. 19.Groundwater occurs in thin, laterally discontinuous and vertically stratified sand lenses found at depths ranging between 60 and 120 feet below the ground surface, or between 20 and 38 feet below the base of the Units. Groundwater elevations range from 323 feet mean sea level (MSL) to 348 feet MSL. The groundwater is unconfined. 20.Monitoring data indicate background groundwater quality has an electrical conductivity (EC) ranging between 5,300 and 10,500 micromhos/cm, and concentrations of total dissolved solids (TDS) ranging from 4,900 to 7,460 milligrams per liter (mg/1) with an average concentration of 6,015 mg/l. Therefore, the first encountered groundwater exceeds the recommended secondary maximum contaminant level (MCL) of TDS for drinking water which is 500 mg/1. 21.The first encountered groundwater exceeds the primary MCLs for drinking water for selenium and nitrate (as nitrate) of 50 micrograms per liter (pg/1) and 45 mg/l respectively. Selenium ranged from 57 to 219 fag/I and nitrate ranged from 14 to 598 mg/l. Secondary drinking water standards were also exceeded for manganese (50 fag/1), chloride (250 mg/1), and sulfate (250 mg/1).