Common use of Identification of Basin Analytes Clause in Contracts

Identification of Basin Analytes. Apply additional reference values (e.g. DEQ background and NPDES benchmarks) to statistical results to generate analyte list per basin for further evaluation in Section 5. A multiple-step process was used to evaluate the stormwater data from City outfall basins. The process included the comparison of stormwater analyte concentrations detected in City stormwater outfall basins to established criteria in order to select analytes for statistical evaluation. This screening is followed by statistical analyses of harborwide stormwater data collected by the City, LWG and others for City and non-City outfall basins discharging to the Study Area to provide an objective context for interpreting the potential significance of results. Concentrations in City basins at the higher end of the spectrum can be compared to concentrations observed at known sources to help indicate where significant sources to the river may be present in City basins. The results of the stormwater data evaluation provide a basis for identifying City outfall basins where further source tracing may be needed for specific analytes. These analytes are carried forward into the basin-specific assessments of source-tracing needs presented in Section 5. This analysis does not evaluate the inriver sediment in the vicinity of City outfalls to determine if there is a complete pathway for upland contributions (e.g., an outfall may be identified for further source tracing even if there are no elevated sediment concentrations adjacent to the outfall).