Prime Hook National Wildlife Refuge contaminants study: Examining the impacts of Clifton Cannery, a potential point source
Vydavatel US Fish and Wildlife Service, Department of the Interior
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Sediment Data Analytical results for sediment samples collected from the unnamed creek and clean Delaware background areas are compared to ERM levels in Table 1. The ERM is the 50th percentile concentration associated with adverse biological effects Long and Morgan 1990. The ERM is defined as the concentration above which toxic effects usually or frequently occur. Concentrations of all metals detected in the unnamed creek sediment samples were less than ERM levels Long and Morgan 1990 Table 1. Two of four sediment samples from the unnamed creek contained p,pDDD concentrations that exceeded the ERM value of 0.020 ppm. Because no DDE or DDT were found in sediments, the ERM for total DDT the sum of DDT, DDD, and DDE of 0.35 ppm was not exceeded. The mean concentration for the two samples with detectable levels of p,pDDD was 0.057 ppm. While total PAHs did not exceed the ERM value, one naturally occurring PAH, perylene, was found to exceed apparent effects thresholds AET for amphipods 0.23 ppm and bivalve larvae 0.095 ppm Long and Morgan 1990. The AET is a concentration above which statistically significant biological effects always occur. The mean perylene concentration was 0.341 ppm with two out of four samples exceeding the amphipod AET and all four samples exceeding the bivalve larvae AET. There is no ERM value for perylene at this time.