Letter Report Summarizing Disposal Methods for Drummed Soil Cuttings, Water, and Field Generated Waste Supplementary Remedial Investigation/Feasibility (RI/FS) of Umatilla Depot Activity (UMDA), Hermiston, Oregon.

摘要

During Dames & Moore's Supplementary RI/FS field programs at UMDA, all soil cuttings, water, and grout generated as a result of drilling, monitoring well construction, and basalt well abandonment were containerized in 55-gallon drums. Drummed wastes, as well as miscellaneous field waste (e.g., poly pipe, pumps, etc.), were stored in three warehouses (Buildings 411, 412, and 413) until appropriate disposal methods were determined. When possible, chemical analysis results from samples collected during drilling and groundwater sampling were evaluated to classify drum contents as hazardous or non-hazardous for disposal purposes. In some cases, however, it was not possible to associate environmental sample results with drummed material (e.g., soil samples were not collected during monitoring well installation). in these cases, samples from the drums were collected and analyzed. A list of analytes is provided in Attachment A, along with a copy of all analytical results. Based on analytical results and discussions with Mr. Mark Daugherty of UMDA and Dr. Charles Lechner of USAEC, the appropriate disposal methods for hazardous drums, non-hazardous drums, and miscellaneous field waste were determined, as discussed in detail below.