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