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