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ANIL., STANDARD PROVISIONS AND REPORTING REQUIREMENTS September 1993 FOR WASTE DISCHARGE REQUIREMENTS FOR DISCHARGES REGULATED BY CHAPTER 15 AND/OR PART 258 _19- 2. The owner of the waste management facility shall have the continuing responsibility to assure protection of usable waters from discharged wastes and from gases and leachate generated by discharged waste during the active life, closure, and post -closure maintenance period of the WMUs and during subsequent use of the property for other purposes. Unless otherwise stated, all terms are as defined in Chapter 2, Division 7, of the California Water Code (Section 13050 et.seq.), in Article 10, Chapter 15, Division 3, Tide 23 of the California Code of Regulations (23 CCR 2600 et.seq.), and in Section 258.2, and elsewhere in Part 258, Title 40 of the Code of Federal Regulations. The following additional definitions apply to the Order: 1. "Affected Persons" means all individuals who either own or occupy land outside the boundaries of the parcel upon which the landfill is located that has been or may be affected by the release of leachate or waste constituents (in gas or liquid phase) from an MSW landfill. 2. 'Sackground Monitoring Point" means a device (e.g., well) or location (e.g., a specific point along a lakeshore), upgradient or sidegradient from the waste management unit, or as otherwise approved by the Executive Officer, where water quality samples are taken that are not affected by any release from the waste management unit and that are used as a basis of comparison against samples taken from downgradient Monitoring Points. 3. "Composite liner" means a liner that consists of two or more components, which include a Synthetic Liner in direct and uniform contact with an underlying layer of prepared, low - permeability soil such that the net permeability of the resulting combination is significantly less than would be expected by reference to the permeability of the individual components layers. 4. Unless otherwise specified, "composite sampW' means a combination of individual samples either collected over a specified sampling period or collected over an area at one time (synoptically): a. at equal time intervals, b. at varying time intervals so that each sample represents an equal portion of the media to be sampled. The duration of the sampling period shall be specified in the Monitoring and Reporting Program. The method of compositing shall be reported with the results. 5. "Constituents of Concern (COC)" means those constituents which are likely to be in the waste in the WMU or which are likely to be derived from waste constituents in the event of a release.