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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0219 -20- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION AND OPERATION OF NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL FACILITY, SAN JOAQUIN COUNTY routine laboratory operating conditions that are available to the facility. The Discharger's technical report,pursuant to §20415(e)(7) of Title 27, shall consider the PQLs listed in Appendix IX to Chapter 14 of Division 4.5 of Title 22, California Code of Regulations, for guidance when specifying limits of precision and accuracy. For any given constituent monitored at a background or downgradient monitoring point, an indication that falls between the MDL and the PQL for that constituent(hereinafter called a"trace"detection) shall be identified and used in appropriate statistical or nonstatistical tests. Nevertheless, for a statistical method that is compatible with the proportion of censored data(trace and ND indications) in the data set, the Discharger can use the laboratory's concentration estimates in the trace range(if available) for statistical analysis, in order to increase the statistical power by decreasing the number of "ties". 17. Background for water samples or soil-pore gas samples shall be represented by the data from all samples taken from applicable background monitoring points during that reporting period(at least one sample from each background monitoring point). The Discharger may propose an alternate statistical method [to the methods listed under 27 CCR §20415(e)(8)(A-D)] in accordance with §20415(e)(8)(E) of Title 27, for review and approval by the Executive Officer. 18. The Discharger may propose an alternate statistical method [to the methods listed under 27 CCR §20415(e)(8)(A-D)] in accordance with §20415(e)(8)(E) of Title 27, for review and approval by the Executive Officer. Upon receiving written approval from the Executive Officer, alternate statistical procedures may be used for determining the significance of analytical results for common laboratory contaminants (i.e., methylene chloride, acetone,diethylhexyl phthalate, and di-n-octyl phthalate). Nevertheless, analytical results involving detection of these analytes in any background or downgradient sample shall be reported and flagged for easy reference by Board staff. 19. The Discharger shall use the following nonstatistical method for all analytes,which are not amenable to the statistical test above. The nonstatistical method shall be implemented as follows: a. For every compliance well,regardless of the monitoring program, the discharger shall use this data analysis method,jointly, for all analytes that are detected in less than 10% of background samples. Any analyte that triggers a discrete retest per this method shall be added to the monitoring parameter list: Triggers—From the constituent of concern or monitoring parameter list identify each analyte in the current sample that exceeds either its respective MDL or PQL. The discharger shall conclude that the exceedance provides a preliminary indication