Publication Summary

This document is one in a series describing the results of groundwater and surface water monitoring at the American Crossarm and Conduit site. Groundwater and surface water downgradient of the facility are being monitored to determine if the selected remedy of off-site disposal and containment of some of the contaminated soil and sediment on the facility property has been an effective form of remediation. Ecology has conducted monitoring at this site since 1997.

This document is one in a series describing the results of groundwater and surface water monitoring at the American Crossarm and Conduit site. Groundwater and surface water downgradient of the facility are being monitored to determine if the selected remedy of off-site disposal and containment of some of the contaminated soil and sediment on the facility property has been an effective form of remediation. Ecology has conducted monitoring at this site since 1997.

Results of samples collected in September 1999 and June 2000 from two downgradient monitoring wells (MW-24 and MW-25) and two on-site surface water stations (ACCSW1 and ACCSW2) are discussed. All samples collected were analyzed for polynuclear aromatic hydrocarbons (PAHs) and chlorinated phenolics.

In both sampling periods, naphthalene, 2-methylnaphthalene, and 1-methylnaphthalene were the only PAHs detected in the downgradient monitoring wells. Mean concentrations were 0.022 ug/L for naphthalene, 0.014 ug/L for 2-methylnaphthalene, and 0.008 ug/L for 1-methylnaphthalene. None of the PAH constituents exceeded applicable standards. Chlorinated phenolics were not detected in either of the wells during these two rounds of sampling.

Most of the PAHs analyzed for were detected at both surface water stations. Pentachlorophenol was tentatively identified at station ACCSW1 in September 1999. All detected analytes in the surface water samples were far below established water quality criteria for fresh water (EPA, 1992).

Link to EIM data for User Study ID CROSSARM