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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2009-0049 -6- <br /> SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br /> HARNEY LANE LANDFILL <br /> SAN JOAQUIN COUNTY <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 /> Each of these estimations shall be included in the semi-annual reports. <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 /> monitor-ing-wells-at-appropriate locations-and-depths-to-yield-ground-water <br /> samples from the uppermost aquifer that represent the quality of ground <br /> water 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 /> i. Samples from such wells are more representative than those provided by <br /> upgradient wells; or <br /> ii. Installation of an upgradient background well is not feasible; and <br /> iii. 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 E.3.a herein. <br /> b. Monitoring Parameters <br /> See Section E.3.b. <br /> c. Monitoring Schedule <br /> The background monitoring schedule shall be as specified in Section E.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 E.3.c. <br /> 3. Corrective Action Monitoring (Sections 20425 and 20430) <br /> The-Discharger shall-install and operate a groundwater corrective action <br /> monitoring system for the purpose of monitoring the nature and extent of the <br />