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MONITORING AND&ORTING PROGRAM NO. 0 4 SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS FOR POST-CLOSURE AND CORRECTIVE ACTION MONITORING CORRAL HOLLOW MUNICIPAL SOLID WASTE LANDFILL SAN JOQUIN COUNTY products, and hazardous constituents that are reasonably expected to be in or derived from waste contained in the Unit. The constituents of concern for all Units at the facility are those listed in Tables I through IV for the specified monitored medium, and Table V. The Discharger shall monitor all constituents of concern every five years, or more frequently as required in accordance with a Corrective Action Program. a. Monitoring Parameters Monitoring parameters are constituents of concern that are the waste constituents, reaction products,hazardous constituents, and physical parameters that provide a reliable indication of a release from a Unit. The monitoring parameters for all Units are those listed in Tables I through V for the specified monitored medium. 3. Concentration Limits For a naturally occurring constituent of concern, the concentration limit for each constituent of concern shall be determined as follows: a. By calculation in accordance with a statistical method pursuant to §20415 of Title 27; or b. By an alternate statistical method acceptable to the Executive Officer in accordance with §20415 of Title 27. 4. Point of Compliance The point of compliance for the water standard at each Unit is a vertical surface located at the hydraulically downgradient limit of the Unit that extends through the uppermost aquifer underlying the Unit. 5. Compliance Period The compliance period for each Unit shall be the number of years equal to the active life of the Unit plus the closure period. The compliance period is the minimum period during which the Discharger shall conduct a water quality monitoring program subsequent to a release from the Unit. The compliance period shall begin anew each time the Discharger initiates an evaluation monitoring program.