Further Source Tracing in City Outfall Basins Sample Clauses

Further Source Tracing in City Outfall Basins. The source-tracing status of the City outfall basins, as identified through the basin- specific assessments discussed in Section 5 and summarized in Table 5-2, fall into three general groups:  No further City source tracing is planned – This group, comprising the majority (13) of City outfall basins evaluated, represents basins for which stormwater analyte concentrations are low and which are least likely to include significant, uncontrolled upland sources. The City does not anticipate conducting further source tracing activities in the stormwater conveyance systems within these basins.  No further source tracing is recommended at this time (but may be needed in the future) – This group, comprising xxx Xxxx outfall basins, generally represents basins where data analysis indicates contaminant sources are present but for which potential upland sources have been identified and are in the process of conducting source control evaluations under DEQ oversight. As indicated in Table 5-2, the City plans to review findings of the source control evaluation investigations of the identified sites. Whether additional City source tracing efforts, DEQ-required source control measures at upland sites, or DEQ site discovery actions are needed depends largely on the findings of the ongoing source control evaluations. Therefore, the City does not plan to conduct further source tracing in the stormwater conveyance systems within these basins at this time and will determine the need for further source tracing once additional information is available.  Further source tracing may be needed – This group, comprising two City outfall basins (OF 52C and OF 53), represents basins where contaminants are present in stormwater at levels that indicate uncontrolled sources may exist within the basin or that nearby sources may be impacting stormwater quality in the basins (e.g., air deposition, particle tracking) and for which potential sources have not been identified. Additional City and DEQ evaluation is recommended to determine whether additional source tracing and/or DEQ site discovery efforts are needed. It is important to note that source tracing recommendations have been developed in this report without review of relevant inriver data. For all basins where data indicate that source tracing should be considered now or following completion of investigation and control of known sources, inriver sediment data will be evaluated to ascertain the potential significance of the outfall as...