Publication Summary

This document is one in a series describing the results of ground water sampling at Restover Truck Stop. Ecology has conducted ground water sampling at the site from 1987 to the present. To remediate soil and ground water contamination a vapor extraction system (VES) was constructed in the summer of 1993. The VES has been operating steadily since February 1994.

This document is one in a series describing the results of ground water sampling at Restover Truck Stop. Ecology has conducted ground water sampling at the site from 1987 to the present. To remediate soil and ground water contamination a vapor extraction system (VES) was constructed in the summer of 1993. The VES has been operating steadily since February 1994.

In August, ground water samples were collected from two monitoring wells. In November, three wells were sampled. Few wells were sampled due to the unusually low water levels; most of the regularly sampled wells were dry. All collected samples were analyzed for benzene, toluene, ethylbenzene, total xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPH-G).

Overall, BTEX concentrations in the upper aquifer have decreased substantially since 1989. Concentration decreases are probably due to a combination of plume spreading, dispersion, biodegradation and reduction of source loading. Since August 1991 concentrations have been relatively stable. Since the installation of the VES, the monitoring period has been too short to determine whether the VES has improved the ground water quality. BTEX concentrations continue to be elevated in well WDOE-6A. In August, Model Toxic Control Act (MTCA) cleanup levels were exceeded for all the BTEX compounds in WDOE-6A and for TPH in both WDOE-6A and MW-8A. In November, cleanup levels continued to be exceeded in WDOE-6A for BTEX and TPH, and benzene in MW-8A.

Link to EIM data for User Study ID RESTOVER