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MONITORING AND REPORTING PROGRAM NO.R5-2014-0006 19 FORWARD INC.AND REPUBLIC SERVICES INC. FORWARD CLASS II LANDFILL SAN JOAQUIN COUNTY 2. Monitoring Parameters Monitoring parameters are a select group of constituents that are monitored during each monitoring event that are the waste constituents, reaction products, hazardous constituents, and physical parameters that provide a reliable indication of a release from a waste management unit. The monitoring parameters for all waste management units are those listed in Tables I through V for the specified monitored medium. 3. Constituents of Concern (COCl) The COCs include a larger group of waste constituents, their reaction products, and hazardous constituents that are reasonably expected to be in or derived from waste contained in the waste management unit, and are required to be monitored every five years [Title 27, sections 20395 and 20420(8)]. The COCs for all waste management units at the facility are those listed in Tables I through IV for the specified monitored medium, and Table VI. The Discharger shall monitor all COCs every five years, or more frequently as required in accordance with a Corrective Action Program. The last 5-year COC report was submitted to the Central Valley Water Board in the 2008, Third Quarter Monitoring Report and 5-year COCs are due to be monitored again in the 2013 First Quarter Monitoring Report. 4. Concentration Limits For a naturally occurring constituent of concern, the concentration limit for each constituent of concern shall be determined as follows: a. By calculation in accordance with a statistical method pursuant to Title 27, section 20415(e)(8); or b. By an alternate statistical method meeting the requirements of Title 27, section 20415(e)(8)(E). The methods for calculating concentration limits were included in the 2011 Concentration Limit Update Report. The approved method for groundwater wells uses intra-well tolerance limits and the method for surface water samples uses inter-station tolerance limits. All tolerance limits are calculated at 95% confidence and a Type I error rate of alpha — 0.01 is proposed for surface water samples.