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-3- The clay liner will be a minimum Of two feet in thickness with field and lab testing to insure that this liner will prevent water movement into the waste. The clay liner will consist Of materials that contain sufficient clays and silts selected site m plan has to meet the minimum requirements. The quality assurance been prepared to handle field and lab testing and problems that might be encountered during construction. e foot on topthicknessofthe clay in and The vegetative/drainage layer will be on will consist of native material and be placed liner. This layer will then be seeded with natural grasses and maintained to insure that erosiondraiisadequately controlledduring. Thisrainfall layer will also allow the clay liner to n - events. The culvert drainage system is designed to gather the run-off that originates from the vegetative layer and route the water into a holding pond. The use of corrugated steel culverts to route the water will prevent erosion caused by channelized flowing water. The groundwater monitoring system will consist of 13 groundwater monitoring wells to collect information about the nature of the flow and quality of groundwater underneath the facility. Twelve of the 13 wells presently exist at the facility and have been used to gather groundwater quality and flow information. The groundwater flow information gathered thus far indicates that one additional well is needed to detect any contamination that might be released from wMU-A- The vadose zone directly below the landfill unit will be suc-ion lysi-meters. Suction lysimeters monitored with the use of %_ e-x tract water from- soil that is not a--re nonito-rin- devices that These devices will fully water-saturated but not completely dry. it liners in order be placed directly under the hazardous waste un to detect a leak, should it occur, before the contamination can reach groundwater. Regulatory Basis The Forward, Inc. closure Plan for the hazardous waste unitermanentland supplementary documents would allow Forward, Inc. to py close the hazardous waste unit in accordance with all of the requirements set forth in: the Resource conservation and Recovery Act (RCRA) Of 1976, as amended by the Hazardous and Solid Waste Act (HSWA) Of 1984 ; the California Health and Safety Code; Title 22 of the California Code of Regulations; and any stringent conditions required by DHS and EPA in the other more s h and the final closure Plan to insure protection of public health environment.