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MONITORING AND REPORTING PROGRAM NO. R5-2010-0016 -9- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY a. The groundwater flow velocity b. The gradient direction in the upper aquifer, and in any additional zone of saturation monitored pursuant to this MRP c. Times of highest and lowest elevations of the water levels in the wells d. Separation of groundwater from the lowest point of the unit Each of these estimations shall be included in the semi-annual reports. 2. Background Monitoring (Section 20415(b)(1)(A)) Background monitoring shall be performed for the purpose of developing and updating concentration limits as described in Section C.2. a. Monitoring Points The Discharger shall install and operate a sufficient number of background monitoring wells at appropriate locations and depths to yield ground water samples from the uppermost aquifer that represent the quality of ground water that has not been affected by a release from the unit. The background monitoring system may include wells that are not hydraulically upgradient of the Unit if: 1) Samples from such wells are more representative than those provided by upgradient wells; or 2) Installation of an upgradient background well is not feasible; and 3) It can be demonstrated that samples from such wells are representative of background groundwater quality. The background monitoring points for groundwater shall be as specified in Section F.3.a herein. b. Monitoring Parameters - See Section F.3.b. c. Monitoring Schedule The background monitoring schedule shall be as specified in Section F.3.c herein, except for five-year inorganic COCs (i.e., dissolved metals) for which concentration limits have not yet been developed. For such COCs, background monitoring shall be conducted annually until a sufficient amount of data has been collected for statistical (or nonstatistical) determination of concentration limits. Thereafter, such monitoring may be reduced to every five years in accordance with Section F.4. 3. Detection Monitoring (Sections 20415(b)(1)(B) and 20420) The Discharger shall install, operate and maintain a groundwater detection monitoring system that complies with the applicable provisions of Sections 20415 and 20420 of Title 27. Such system shall be appropriate for detecting, at the earliest possible time, a release to groundwater from the Unit. Detection