Conceptual Site Model - Argonne National Laboratory

WVDP Phase 1 CSAPcompleted in 1990. The containers were covered with tarps to prevent infiltration of precipitationand their rear gates were equipped with rubber gaskets to prevent discharge of any soil or liquid.The roll-off containers and their contained soil have been removed and disposed of offsite. Thegravel pad will be removed during Phase 1 of the proposed decommissioning.H.2 Physical SettingWMA 9 is primarily flat and located on the South Plateau. It is bordered to the southeast andsouthwest by wetlands. It is bordered to the west by the WVDP premises fence line, WMA 6, andWMA 10, to the north by WMA 6 and WMA 7, to the east by WMA 8, and to the south by theWVDP premises fence line. The railroad spur servicing the site runs through the western end ofWMA 9. Approximately 2.6 acres of WMA 9 is composed of hardstands, roads, or railroad bed.WMA 9 is underlain by the Lavery Till, a relatively impermeable unit. Groundwater flowsvertically through the unweathered Lavery Till to the Kent Recessional Sequence. The KentRecessional Sequence is more permeable and does transport groundwater in a northeasterlydirection, discharging to Buttermilk Creek.WMA 9 is currently drained by three distinct drainage ditches trending from the northwest to thesoutheast where they feed Franks Creek. These include one running along the eastern side of therailway, one connecting with the southwest side of the Drum Cell facility, and one runningparallel to the northeast side of WMA 9.H.3 Area HistoryFigure H.3 shows WMA 9 in 1962, prior to site development. Prior to site development, thenorthern portion of WMA 9 was farmed. The southern portion was a shrubby area drained by thewestern reaches of Franks Creek.Figure H.4 shows WMA 9 in 1966, after development of the site had begun. When the site wasestablished, the drainage features of WMA 9 were altered so that the drainage was aligned withthe fence line along the south side of WMA 9. The railroad was installed by the mid 1960s, andthe northern portion of WMA 9 was cleared and used for open storage.Rev. 1 H-2