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MONITORING AND REPORTING PROGRAM NO. R5-2010-0016 -4- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br /> <br /> <br />G.1 and G.2, which are incorporated herein and made part of this Order by <br />reference. The COC list groups are as follows: <br /> Table C.1 <br />Constituents of Concern Units Test Method <br />Field Parameters As specified in Table G.1 <br />Inorganic: <br />General Minerals mg/L See Table G.1 <br />Dissolved Metals µg/L See Table G.1 <br />Organic: <br />Volatile Organic Compounds µg/L USEPA Method 8260B <br />Semi-Volatile Organic <br />Compounds <br />µg/L USEPA Method 8270 <br />Organophosphorus Pesticides µg/L USEPA Method 8141A <br />Chlorinated Herbicides µg/L USEPA Method 8151 <br />Organochlorine Pesticides µg/L USEPA Method 8081A <br />Polychlorinated Biphenols <br />(PCBs) <br />µg/L USEPA Method 8082 <br /> <br />2. Concentration Limits (Section 20400) <br />Statistical CLs shall be developed and updated using historical background <br />monitoring data. Data analysis shall be in accordance with WDR Monitoring <br />Specifications E.20 and E.22.a using an “interwell comparisons” approach (e.g., <br />comparing downgradient with upgradient, or downstream with upstream). CLs <br />for nonstatistical COCs shall be developed and updated, as applicable, in <br />accordance with WDR Monitoring Specifications E.21, E.22.b, and E.23. <br />a. Unsaturated Zone <br />CLs not yet developed due to lack of liquid recovery from lysimeters. CLs <br />shall be developed (and updated thereafter) once a sufficient amount of <br />background monitoring data has been collected under Section E.2 herein.1 <br />b. Groundwater <br />1) Statistical CLs <br />CLs for general minerals (specified in Table G.1) were calculated using the <br />interwell tolerance method. CLs for dissolved metals have not yet been <br />developed due to limited background monitoring data (9 events). Interim <br />CLs for 11 out of 24 dissolved metals tentatively identified as statistical <br />COCs are listed in Table G.1. Revised CLs for these dissolved metals <br />shall be developed once additional background monitoring has been <br />conducted for these constituents per Section F.2.c herein. <br /> <br />1. WDR Provision G.8.b requires that the Discharger investigate the lysimeters and submit a workplan for <br />any repairs that may be necessary to ensure that they are in good working order.