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Constituents from six major chemical groups were measured: radionuclides, major and trace elements, organo chlorine pesticides and PCBs, PAHs, UWI compounds, and current-use pesticides. The results of the chemical analyses are presented in tables 2–7. Interpretations of data listed in this report are presented in Van Metre and Carpet Cleaning Without Water others (2006). 

In general, concentrations were much higher in street mud and suspended sediment than in lake bottom sediment, and Carpet Cleaning Without Water concentrations amongthe lake bottom-sediment samples were highest near the 17thStreet Canal.The consensus-based SQGs of MacDonald and others (2000) are listed for inorganic and organic constituents below the analytical results (tables 3, 4, and 5). 

Two SQGs arelisted—the threshold effect concentration (TEC) and probableeffect concentration (PEC). The TEC represents the concentration in freshwater sediment below which adverse effects tobenthic biota occur rarely, and Carpet Cleaning Without Water the PEC represents the concentration in freshwater sediment above which adverse effectsare expected to occur frequently. 

The consensus-based SQGsare used as screening-level benchmarks and do not provideevidence for actual toxicity to aquatic organisms or Carpet Cleaning Without Water humansas a result of exposure to the sediment samples collected forthis study. Consensus-based SQGs are recommended forindividual constituents and sums of organochlorine pesticides, PCBs, and PAHs. 

Total DDT is defined as the sum ofp,p’-DDD, p,p’-DDE, and p,p’-DDT. Total PCB Aroclors isthe sum of PCB Aroclors 1016/124, 1254, and Carpet Cleaning Without Water 1260. TotalPCB congeners is the sum of the 27 PCB congeners reportedby the laboratory, ranging from PCB 8 to PCB 206. 

In all summations of the analytical results, nondetections were assigned a value of zero and estimated valueswere used at the concentration reported.Field observations and Carpet Cleaning Without Water radionuclide activities indicatesediment redistribution and deposition resulting from Hurricanes Katrina and Rita. 

Sediment that was recently in contactwith the atmosphere was identified by the presence of 7Be(table 2). 7Be is a short-lived, Carpet Cleaning Without Water naturally occurring radionuclidethat is useful for dating sediment to about 1 year. The presenceof 7Be in a bottom-sediment core is an indication that the sediment was in contact with the atmosphere within the past year(Holmes, 1998). 

Activities of 7Be greater than 3 disintegrations per minute per gram were detected in samples Carpet Cleaning Without Water  collected after Hurricane Katrina but before Hurricane Rita from sitesE2 and E3 in front of the 17th Street Canal and from site H2 in front of the Industrial Canal. 7Be was detected throughout the entire thickness of the core collected at site H2 after Hurricane Rita.

In general, trace element and nutrient concentrations werehigher in street-mud samples and suspended-sediment andbottom-sediment samples from the 17th Street Canal area thanfrom other locations (table 3). Lead and zinc concentrationsexceed the PECs most often for the inorganic constituentswith six and 10 concentrations higher than the PEC, Carpet Cleaning Without Water respectively. 

In comparison to the mid-lake reference site (MID), Carpet Cleaning Without Water some suspended-sediment samples (E1, E2, G1) had elevated concentrations of copper, lead, silver, and zinc. 

Among the bottom-sediment samples, only those collected near the 17th Street Canal (MET on September 29 and October 3; E2 onSeptember 21 and October 9; E3 on October 9) had highertrace element concentrations (cadmium, copper, lead, mercury,and zinc) relative to MID, Carpet Cleaning Without Water except for higher barium concentrations at H2.

The highest concentrations of organochlorine compounds, PCBs, PAHs, and current-use pesticides occurred near the 17th Street Canal (tables 4, 5, and Carpet Cleaning Without Water 7). The most frequently detected chlorinated compounds were p,p’-DDD,p,p’-DDE, dieldrin, cis-chlordane, trans-chlordane, transnonachlor, and PCBs (table 4). 

Concentrations of p,p’-DDDexceed the PEC at sites E3 and CD, and Carpet Cleaning Without Water concentrations oftotal PCB Aroclors exceed the PEC at sites MET and E3.The most frequently detected PAHs were the 3-, 4-, and5-ring parent PAHs and 2,6-dimethylnaphthalene (table5). Each of the PECs for individual PAHs and ΣPAHSQG isexceeded in one or more samples. 

Sixteen of the 61 UWIcompounds reported were detected in 50 percent or Carpet Cleaning Without Water more of samples, including parent and methyl-substituted PAHs,anthraquinone, indole, 3-methyl-1H-indole, para-cresol,cholesterol, and beta-sitosterol and beta-stigmastanol(table 6). 

In most cases, suspended-sediment samples hadhigher concentrations of the UWI compounds than bottom sediment and Carpet Cleaning Without Water street-mud samples. UWI compound concentrations were not highest in the samples collected nearthe 17th Street Canal, as was the case for the inorganicand other organic constituents. 

Thirteen of the 63 currentuse pesticides analyzed were detected at least once (table 7).Among these, Carpet Cleaning Without Water chlorpyrifos and three fipronil degradates(fipronil sulfide, fipronil sulfone, and desulfinyl-fipronil) were detected in 40 percent or more of the samples. No consensusbased SQGs are recommended for most of the UWI compounds or current-use pesticides. 

Please identify any areas of water-resource sciencethat the OH WSC is not addressing, but should beaddressing.4) Please identify any issues (e.g., science, regulatory, Carpet Cleaning Without Water fiscal, and procedural) that might prevent yourorganization from cooperating with the OH WSC inthe future.5) How do OH WSC products and/or expertise influence decision making in your organization?6) 

The Ohio WSC conducts basic water-resourcemonitoring and Carpet Cleaning Without Water interpretive research (approximately55% and 45% of our program, respectively). Do youperceive this program balance to be about right?7) 

What OH WSC products or services are the mostrelevant to your organization?8) Do you believe the value and Carpet Cleaning Without Water cost of OH WSCproducts or services are commensurate?

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