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i <br /> • <br /> i <br /> Woods Hole Group <br /> Laboratory results from the chemical analyses arc included is Section .2 and <br /> summarized in Fables 2, 3, 4, and 5. Table 2 shows results of the metals analyses in <br /> comparison with regulatory thresholds for various disposal options. In general the data <br /> show metal concentrations below the regulatory thresholds for dredged material disposal <br /> at a land or in-harbor site with bulkheading(Category One 314 CMR .o or for upland <br /> reuse (MCP #1 & GWA . In comparison with Massachusetts Background Soill <br /> Concentrations('C /CARS),the Mashpee River sediments have greater concentrations of <br /> -- a number of metals Al,Be,Cft,Co,Fe,Ing,Ni, Se,and V),,most notably Fe. <br /> Table 3 showslaboratory analyses for PCBs and petroleum hydrocarbons for the <br /> �-- Mashpee River sediments in comparison with regulatory thresholds for various disposal <br /> options. Laboratory analyses for the petroleum hydrocarbons were analyzed using the <br /> VPH/EPH Method that provides specific concentrations for a variety of aliphatic and <br /> aromatic hydro arboas4 Total PCB values were determined using the NOAANIST <br /> algorithm. The data in Table 3 show that the petroleum hydrocarbons in each of the <br /> cores are well below the thresholds for upland reuse(MCP S-l &GW-;1)or disposal at a <br /> T. land or ire-harbor site with bulkheading (Category One 314 CMR 9.017). With one <br /> exception at sample core ,all PCB values fall below the regulatory thresholds. <br /> Fables 4 and 5 show laboratory analyses for VOCs and PAHs for the Mashpee lover <br /> sediments in comparison A&ith regulatory thresholds for upland rouse listed in MCP -1 <br /> GW-1. In all cases the reported values were either undetected L) or found at <br /> concentrations below the allowable thresholds, <br /> Based on review,of the chemical constituent data from the core data, it was determined <br /> that the Mashpee River sediments are generally chernicaUy clean. Comparison of the <br /> hemi al analyses with thresholds for various disposal options indicate that thefine- <br /> grained Mashpee River sediments could be disposed of in the open ocean, for upland <br /> reuse purposes,or at a lined landfill. <br /> 1 <br />