Annual report of the Environmental Restoration Monitoring and Assessment Program at Oak Ridge National Laboratory for FY 1992. Environmental Restoration Program

Abstract

We thank ali those individualswho have assisted in the collection and the preparationof the material contained in this report. The following individuals are acknowledged as principal investigators for the biota studies portion of the subject report:

The development of an aquatic spill model for the White Oak Creek watershed, Oak Ridge National Laboratory, Oak Ridge, Tennessee

“…This chapter provides an overview of the hydrologic aspects and components composing the WOC watershed and establishes a rational foundation from which'to develop the ORNL aquatic spill model. The information and data summarized below have either been taken directly from or are based on the reports by Blaylock et al (1992Blaylock et al ( ,1993, , Clapp (1992), Cook et al (1992), and Ford and Wefer (1993). The available open literature on the WOC watershed is extensive; the summary below is an introduction for the sole intent of defining physical parameters and measured data required to develop and synthesize the ORNL aquatic spill model.…”

Composite analysis for solid waste storage area 6

“…A gromdwater zune contributes the remaining 10% or more of stream flow, and this occurs through a permeable layer called the "water table interval." This flow zone has a thickness of 1-5 m (Clapp 1992). Intermediate and deep intervals of the aquifer have thicknesses of up to 100 m and contribute very little to stream flow because of low hydraulic conductivity and disconnected hctures.…”

Source document for waste area groupings at Oak Ridge National Laboratory, Oak Ridge, Tennessee

“…Beneath the stormflow zone is the vadose zone, which receives < 10% of the flux. The vadose zone exists throughout the study area except where the water table intersects the ground surface, such as along perennial streams and springs (Clapp 1992).…”

“…In the vadose zone and the upper part of the groundwater zone (ie., the water table interval and the upper part of the intermediate interval) there appears to be little or no change in hydraulic conductivity with depth (to depths of approximately 50 m) within the unconsolidated material, and conductivity ranges from 0.006 to 0.3 d d . This wide range in conductivity over most depth intervals indicates that some wells monitor zones of variable conductivities within the regolith, such as fractured zones, rather than more clay rich zones (Clapp 1992).…”