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MONITORING AND REPORTING PROGRAM NO. R5-2010-0016 -5- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br /> <br />2) Nonstatistical CLs <br />Interim CLs for the remaining 13 dissolved metals (i.e., those not detected <br />in any of the 9 monitoring events) and CLs for VOCs and other organic <br />COCs were set equal to the PQL. <br />c. Surface Water <br />CLs for statistical COCs shall be based on either of the following: <br />1) Concurrent upstream monitoring data; and/or <br />2) Statistical analysis of historical upstream monitoring data (assumed for <br />interim CLs under this Order). <br />Interim statistical CLs based on available monitoring data from sampling point <br />S-1 are provided in Table G.1. Revised CLs for these dissolved metals shall <br />be developed once additional background monitoring has been conducted for <br />these constituents under Section G.2 herein. <br />3. Monitoring Points (Section 20405) <br />The monitoring points for unsaturated zone, groundwater, and surface water <br />monitoring shall be as specified in Sections E.2; F.2 and 3; and G.2, respectively. <br />4. Compliance Points <br />a. Unsaturated Zone <br />The compliance points for the unsaturated zone shall consist of all existing <br />and future lysimeters installed along the landfill perimeter, as referenced in <br />Section E.2 herein. <br />b. Groundwater <br />The compliance points for groundwater monitoring shall consist of all <br />groundwater monitoring wells installed along the landfill perimeter, as <br />referenced in Section F.3 herein and described as follows: <br />1) Point of Compliance Wells <br />Section 20405 defines the Point of Compliance (POC) as a vertical <br />surface located at the hydraulically downgradient limit of the Unit that <br />extends through the uppermost aquifer underlying the Unit. <br />The groundwater monitoring wells along the POC shall consist of all <br />downgradient (and cross gradient) landfill perimeter wells, including Gs-2, <br />3D, 4, 5 and 6; <br />2) Upgradient Wells <br />All upgradient perimeter wells within the zone of influence of LFG (e.g., <br />G-1); <br />3) Future Wells <br />Any future wells that meet either (or both) of the criteria in 4a and 4b.