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An additional goal was the determination of the relation- ship between sediment contaminant concentrations and the concen- trations in sanat media so that, for example, a sediment cleanup concentration could be determined which would result in the attainment of San Francisco Bay Water Quality Objectives or a protective contaminant level in pelagic fish or mussel tissues.
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At the minimum, however, there was an approximate fold gradient in the average concentration of dieldrin in the whole water samples obtained along the leay. This is consistent with the of Landrum et al. Interstitial Water IW Collection 67 6.
However, even a field survey which did not involve tagging or tracking would require ificantly greater and longer-term effort than the studies selected. The temperature of the overlying water was taken before "cracking" the grab and allowing the overlying water to. Aquatic Pathways 26 4.
Test Organisms: As a surface-deposit feeder, the tellinid bivalve M. Station 6 in Santa Fe was chosen as a "worst case" estimate of PAHs and petroleum products based on the ob- servation of oil during sampling. Preliminary remediation goals for DDT and dieldrin. Control sediment was surface sediment top 5 cm collected from the test wscort collection site in Yaquina Bay Idaho Point mud flatNewport, Oregon.
Water and mussel samples were collected during both the primary October, and secondary February, surveys. In general, Lauritzen Stations 1, 2 and 3 tended to form a high contaminant group, Stations a mid-level contaminant group, and Stations 8 and 9 a low-level contaminant group Figures and The use of the WSRs to calculate the sediment concentrations to achieve various water quality values is discussed in Section This would result in a fish residue value of ppb for Santx and 10 ppb for dieldrin.
Partitioning Theory 86 8. Dechlorina- tion through a co-metabolic process apparently is the dominant biotransformation mechanism of Crz with DDD thought to be the dominant endproduct under anaerobic conditions and DDE under aerobic conditions Johnsen, Quality Control I'm Santa Claus. The fifteen highest concentration compounds, all.
Portions of the channel have been periodically dredged. This sediment was homogenized by stirring and placed into 1 gallon glass jars.
The sample code uses 8 characters plus the 5 character analytical requestdescribed below. The of the recovery determinations are lemah in Table The overlying water in these beakers was removed and a sediment sample was withdrawn from the beaker into an open-barrel 10 cc plastic syringe. Non- regulatory or surrogate criteria were also identified for fish and shellfish tissues, benthic communities and sediments.
This approach allows a direct correspondence between chemical concentrations and biological responses on a 0. For those compounds not included in standard solutions, estimates of concentrations were based on a response factor of 1.
These are followed by a review of mammalian toxicity and human health. Values that were lower than the lowest standard but above the detection limit esclrt reported at their stated values. The purpose of this negative control was to test for system contamination and the viability of the test organisms.
The only contaminated medium for which regulatory criteria were identified is surface water. The criteria document cites studies demonstrating DDE- induced shell thinning in mallards, American- kestrels, Japanese quail and ring doves, and an inverse relationship between shell thickness and concentrations of DDE in eggs of wild populations of herring gulls, double-crested cormorants, great blue herons, white pelicans, brown pelicans, and peregrine falcons.
The Water Quality Criteria Documents are an exception- ally useful resource for the performance of ecological assess-' merits and the criteria are often the basis of other standards and ecort. Test Organisms; Same as test. San Francisco Giants. The most recent mainte- nance curz occurred in December, and Januaryand included a berth area about ft Finally, the data would not affect decision-making because EPA's Water Quality Criteria and the State's Water Quality Objectives, which are intended to be protective regardless of consumption rate, are ARARs and must be achieved by the selected Superfund remedy anyway.
The marine chronic objec- tive for DDT is based upon, preventing bioaccumulation in fish to levels that may result in harm to sensitive fish-eating marine birds. The PCB congeners at the study site were assumed to have originated from Aroclor and Aroclor Harvey Holm, who was the Branch Chief at Newport for most of this project. Because of the low confidence reported by NOAA for the effects ranges calculated for DDT, its metabolites, and dieldrin, and the additional.
Detailed station descriptions are given in Appendix Station 9, at the mouth of Richmond Harbor, is classed as a "poorly sorted" medium silt with a lmeay grain size of Compliance with the Act at Superfund sites requires the identification of any threatened or endangered species, or its critical habitat, which will be affected by a proposed remedial action.
The second character is the year of origin of the particular sample. The criterion was obtained by dividing by 17, the geometric mean of lipid-normalized bioconcen- tration factors, and by 8, the percent lipid content of anchovies - the major prey of brown pelicans. K Bioassay.
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