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MONITORING AND REPORTING PROGRAM ORDER NO. RS-2009-0049 -3- SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS HARNEY LANE LANDFILL SAN JOAQUIN COUNTY 1. Constituents of Concern (Section 20395) The constituents of concern list includes all the waste constituents, their reaction products, and hazardous constituents that are reasonably expected to be in or derived from waste contained in the Unit. The COCs for the landfill, including monitoring parameters, shall be as listed in Tables G.1 and G.2, which are incorporated herein and made part of this Order by reference. The COC list groups are as follows: Table CA Constituents of Concern Units Test Method Field Parameters As specified in Table G.1 Inorganic: General Minerals mg/L See Table GA Dissolved Metals pg/L See Table G.1 Organic: Volatile-Org-anis-C-ompounds pgfL USEPA-Method 8-260B Semi-Volatile Organic pg/L USEPA Method 8270 Compounds Organophosphorus Pesticides pg/L USEPA Method 8141A Chlorinated Herbicides pg/L USEPA Method 8151 Organochlorine Pesticides pg/L USEPA Method 8081A Polychlorinated Biphenols pg/L USEPA Method 8082 (PCBs) 2. Concentration Limits (Section 20400) Concentration Limits (CLs) for statistical COCs, including general minerals and dissolved metals generally detected in background, shall be based on interwell data analysis (intrawell analysis shall not be used due to evidence of groundwater impacts) using one of the data analysis methods specified in Monitoring Specification E.18. CLs for nonstatistical COCs, including VOCs, other organic COCs, and dissolved metals not (or not generally) detected in background, shall be equal to the method detection limit (MDL). a. Interim CLs Fourteen out of 25 dissolved metals were identified as statistical COCs, based on available historical monitoring data from upgradient well MW-1 (four 5-year monitoring events). Interim statistical CLs for these constituents have been estimated as specified in Table G.1. The remaining 11 dissolved metals (i.e., those not detected in any of the four 5-year monitoring events) were assumed nonstatistical CDCs for setting interim CLs. b. Revised CLs Revised CLs shall be developed for general minerals and dissolved metals onoe additional_ba_ckgr_ound__monitoring. wells_have.been_es-tab..lished per W.DR Provision G.5 and a sufficient amount of monitoring data have been collected for statistical determination of CLs. See Footnote 3, Table E.3.c.