Benchmark Values. This analysis compared PAH and metal concentrations from Port Xxxxxx samples to threshold levels obtained from the literature. The Port data were compiled from effluent, sediment, and mussel tissue samples collected in conjunction with the Ballast Water Treatment Plant (BWTP) permit (APSC, 1995), the Alyeska Environmental Monitoring Program (Xxxxx and Shaw, 1993, 1994b, 1995, 1996), the LTEMP Monitoring Program (Kinnetics Laboratories Inc., 1995, 1996) and U.S. ACE sampling in the Small Boat Harbor (U.S. ACE, 1995) data. Benchmark values were obtained from the U.S. EPA (1996) program for developing Ecotox Thresholds, benchmark determinations for freshwater (Xxxxx, 1996), sediment effects levels (Xxxx and Xxxxxx, 1995), and wildlife threshold levels (Xxxxxxx et al., 1995). The purpose of each study was to synthesize effects-based data into useful criteria for determining at what levels adverse effects occur. We compared benchmark values from the references listed above to PAH and metal concentrations in the BWTP effluent, PAH concentrations in sediments from various locations in the Port, and benzo[a]pyrene concentrations in mussels collected from several beaches. The number of times sample concentrations exceeded benchmark values was tallied and compared between different sub-areas. These results were compared to the ranks from the conceptual model. The results of this analysis can be found in Section 7.1.
Benchmark Values. Xxxxxx ANGB must monitor and report analytical results for the parameters listed on Part A on Discharge Monitoring Reports (DMRs) for outfall 003. The benchmark values listed below are not effluent limitations, and exceedances do not constitute violations. However, if Xxxxxx ANGB’s sampling demonstrates exceedances of benchmark values for two consecutive monitoring periods, Xxxxxx ANGB shall submit a corrective action plan within 90 days of the end of the monitoring period triggering the plan. Parameters Monitoring Requirements Benchmark values Minimum Measurement Frequency (1) Sample Type Total Suspended Solids (TSS) (mg/L) 1 / 6 months Grab 100 Oil and Grease (mg/L) 1 / 6 months Grab 30 Footnote
