New York/ New Jersey Harbor: Alternative Methods for Ex ... - CLU-IN

To complete the decontamination efficiency evaluation, two samples were considered.
One of these samples, MEP-1-1, was an —as-dredged“ sediment sample, which was used
as the untreated sediment. The other sample, MEPP-10-1, which was treated using the
continuous ORG-X decontamination process, was used as the treated sediment. As
mentioned in The Process portion of this report, Portland cement was added to the treated
sediment in ratios of 1:3.33 and 1:6.67. Because the beneficial use end-product consists
of both decontaminated sediment and Portland cement, adjustments to the data had to be
made. A Portland cement to treated sediment ratio of 1:3.33 was assumed. Using this
ratio, approximately 76.9% of the end-product is actually treated sediment. The
concentrations of the treated sediment, MEPP-10-1, were multiplied times a factor of
.76905 to reflect the actual contaminant concentrations in the beneficial-use material.
The treated sediment did not meet the standards for three of the twelve RCRA metal
standards: arsenic, copper, and lead. The arsenic concentration was 53.2 ppm and the
New Jersey Residential and Non-Residential Standards is 20 ppm. The copper
concentration of the treated sediment, 823 ppm, exceeded the residential and non-
residential standard, which are both 600 ppm. In this case, the copper concentration of
the untreated sediment, 1410 ppm, was higher than that of the treated sediment. The
treated sediment contained concentrations of lead greater than the New Jersey Residential
Standard. The standard is 400 ppm and the treated sediment had a concentration of 461
ppm. The concentrations for the nine metals that did meet the standards were an average
of 53.3% and 75.4% below the New Jersey Residential and Non-Residential Soil
Standards, respectively.
The treated sediment contained PCB concentrations below the New York Recommended
Soil Cleanup Standard and the New Jersey Residential and Non-Residential Standards, as
shown in Appendix H. The Metcalf & Eddy process reduced the PCB concentration in
the sediment by nearly 98%, reducing it from 5,440 to 109 ppb.
The average removal efficiencies for TCDD and three dioxins: PeCDD, HxCDD, and
HpCDD were 96% and 99% respectively. The concentration of 2,3,7,8 TCDD was found
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