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INFORMATION SHEET, ORDER NO. R5-2010-0123 2 FOR H.M. HOLLOWAY, INC. H.M. HOLLOWAY SURFACE MINE LANDFILL PROJECT KERN COUNTY Secondary drinking water standards were also exceeded for manganese, chloride, and sulfate. Additionally, first encountered groundwater exceeds several agricultural water quality limits, including those for chloride, molybdenum, selenium, EC, and TDS. The groundwater detection monitoring system, initiated in October 1995, consists of 12 monitoring wells. The Discharger's detection monitoring program for groundwater satisfies the requirements contained in Title 27. Groundwater monitoring to date has not detected the release of any waste constituents. The Discharger was not required by Chapter 15 to conduct unsaturated zone monitoring since the Units were unclassified. The proposed order requires unsaturated zone monitoring with a pan lysimeter installed beneath the leachate collection sumps of the leachate collection and removal system. If leachate is produced, which is unlikely, it will collect in the leachate collection sumps until a sufficient depth of leachate is attained to operate the collection pumps efficiently. Beneath the collection sumps is, therefore, the most likely location that leachate could migrate to the surrounding geologic materials. The Discharger demonstrated that site characteristics alone, without a liner, meet the performance goal contained in Section 20310 of Title 27. The demonstration utilized a mathematical model to predict fate and transport of waste constituents discharged to the Units. Results of the model and past performance of the existing Units demonstrate that the proposed Unit design will ensure no impairment of beneficial uses of surface water or groundwater beneath or adjacent to the landfill in accordance with Section 20260(b)(1) of Title 27. The waste containment system consists of, from the bottom up: naturally occurring geologic materials prepared and conditioned to prevent the migration of waste constituents to groundwater and to convey leachate to the leachate collection sump; a leachate collection and removal system drainage layer consisting of either appropriate selected geologic materials or a geonet/geocushion; and an operations layer to designed to protect the leachate collection and removal system. The County of Kern, Board of Supervisors, certified the final environmental impact report on 1 April 2008. The County of Kern filed a Notice of Determination on 14 April 2008 in accordance with the California Environmental Quality Act (Public Resources Code Section 21000 et seq.) and CEQA guidelines (14 CCR Section 15000 et seq.). The Central Valley Water Board staff considered the environmental impact report and incorporated mitigation measures from the environmental impact report into the proposed Order designed to prevent potentially significant impacts to design facilities and to water quality. This order requires full containment of wastes and does not permit degradation of surface water or groundwater. Further antidegradation analysis is therefore not needed. The discharge is consistent with the antidegradation provisions of State Water Resources Control Board Resolution No. 68-16.