ARCHIVED REPORTS_2010 - Laserfiche WebLink

Home Browse Search

MONITORING AND REPORTING PROGRAM NO. R5-2010-0016 -4- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS NORTH COUNTY LANDFILL SAN JOAQUIN COUNTY G.1 and G.2, which are incorporated herein and made part of this Order by reference. The COC list groups are as follows: 2. Concentration Limits (Section 20400) Statistical CLs shall be developed and updated using historical background monitoring data. Data analysis shall be in accordance with WDR Monitoring Specifications E.20 and E.22.a using an "interwell comparisons" approach (e.g., comparing downgradient with upgradient, or downstream with upstream). CLs for nonstatistical COCs shall be developed and updated, as applicable, in accordance with WDR Monitoring Specifications E.21, E.22.b, and E.23. a. Unsaturated Zone CLs not yet developed due to lack of liquid recovery from lysimeters. CLs shall be developed (and updated thereafter) once a sufficient amount of background monitoring data has been collected under Section E.2 herein.' b. Groundwater 1) Statistical CLs CLs for general minerals (specified in Table G.1) were calculated using the interwell tolerance method. CLs for dissolved metals have not yet been developed due to limited background monitoring data (9 events). Interim CLs for 11 out of 24 dissolved metals tentatively identified as statistical COCs are listed in Table G.I. Revised CLs for these dissolved metals shall be developed once additional background monitoring has been conducted for these constituents per Section F.2.c herein. 1. WDR Provision G.8.b requires that the Discharger investigate the lysimeters and submit a workplan for any repairs that may be necessary to ensure that they are in good working order. 0 Table CA Constituents of Concern Units Test Method Field Parameters As specified in Table G.1 Inorganic: General Minerals mg/L See Table G.1 Dissolved Metals lag/L See Table G.1 Organic: Volatile Organic Compounds lag/L USEPA Method 8260B Semi -Volatile Organic lag/L USEPA Method 8270 Compounds Organophosphorus Pesticides lag/L USEPA Method 8141A Chlorinated Herbicides lag/L USEPA Method 8151 Organochlorine Pesticides lag/L USEPA Method 8081A Polychlorinated Biphenols lag/L USEPA Method 8082 (PCBs) 2. Concentration Limits (Section 20400) Statistical CLs shall be developed and updated using historical background monitoring data. Data analysis shall be in accordance with WDR Monitoring Specifications E.20 and E.22.a using an "interwell comparisons" approach (e.g., comparing downgradient with upgradient, or downstream with upstream). CLs for nonstatistical COCs shall be developed and updated, as applicable, in accordance with WDR Monitoring Specifications E.21, E.22.b, and E.23. a. Unsaturated Zone CLs not yet developed due to lack of liquid recovery from lysimeters. CLs shall be developed (and updated thereafter) once a sufficient amount of background monitoring data has been collected under Section E.2 herein.' b. Groundwater 1) Statistical CLs CLs for general minerals (specified in Table G.1) were calculated using the interwell tolerance method. CLs for dissolved metals have not yet been developed due to limited background monitoring data (9 events). Interim CLs for 11 out of 24 dissolved metals tentatively identified as statistical COCs are listed in Table G.I. Revised CLs for these dissolved metals shall be developed once additional background monitoring has been conducted for these constituents per Section F.2.c herein. 1. WDR Provision G.8.b requires that the Discharger investigate the lysimeters and submit a workplan for any repairs that may be necessary to ensure that they are in good working order. 0