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Table VI Concentrations of trace elements (mg/L) in groundwaters from the monitoring wells after the placement of the dredged sediments at the replacement site

From: Potential contaminants at a dredged spoil placement site, Charles City County, Virginia, as revealed by sequential extraction

Trace element USEPA MCLsa for drinking-water Baseline analysesb SDS2c SDS3c SW30c SW31c
    4/20/02d 10/19/02 10/26/03 4/20/02d 10/19/02 10/26/03 4/20/02d 10/19/02 10/26/03 4/20/02d 10/19/02 10/26/03
Ag 0.1 bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl
Cd 0.005 bdl bdl bdl bdl bdl bdl bdl bdl bdl 0.00065 bdl 0.00058 bdl
Sb 0.006 bdl 0.054 bdl bdl bdl bdl bdl 0.0055 bdl bdl 0.0071 bdl bdl
Tl 0.002 bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl
Pb 0.015 bdl 0.048 bdl bdl bdl bdl bdl bdl bdl bdl bdl 0.012 0.0052
Cr 0.1 bdl-0.004 0.03 0.0048 0.0035 0.04 0.0098 0.0035 bdl bdl bdl 0.015 0.036 0.018
Fe 0.3 2.1–8.1 50 6.3 1.4 5.7 1.7 5 bdl bdl bdl 8.7 37 15
Ni 0.1 bdl-0.009 0.028 0.0096 0.0058 0.03 0.012 bdl bdl bdl bdl 0.013 0.026 0.014
Cu 1.3 bdl 0.039 bdl bdl 0.0064 bdl bdl bdl bdl bdl 0.0051 0.019 0.0077
Zn 5.0 bdl-0.16 0.088 0.56 0.03 0.16 0.2 0.03 bdl 0.03 0.03 0.062 0.120 0.049
As 0.01 bdl 0.0079 bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl bdl
NO3 + NO2 11.0+1.0 bdl-0.11 1.1 0.15 bdl 1 2.8 0.55 bdl bdl 0.18 7.5 4.5 10
Total sulfide ... bdl 2 bdl bdl 1.7 bdl bdl bdl bdl bdl bdl bdl bdl
SO4 250.0 7–76 ... 43 33 ... 44 26 ... 29 55 ... 39 43
TOC ... 1.0–3.1 9.4 3.8 1.8 3.7 3.8 3.7 2.1 2.8 3.4 <1.0 1.7 1.0
  1. aUSEPA maximum contaminant levels for drinking water are based on the data provided by Fetter (Ref. 11), except for new As MCL.
  2. bBaseline analyses are the concentration ranges for trace elements in a set of local groundwaters collected prior to placement of the dredged sediments at the replacement site.
  3. cSamples Analyzed by Gascoyne Laboratories, Inc.
  4. dThe collection date of the groundwater samples.