Pioneer Technical Services, Inc.
This West Side Soils Remedial Investigation (RI) Data Collection Data Summary Report (DSR) presents the results of the surface soil sampling conducted from October 23, 2019, through November 15, 2019, and from May 12, 2020, through June 9, 2020, and the subsurface soil sampling event conducted from June 18, 2020, through July 9, 2020, at the West Side Soil Operable Unit (WSSOU) Site. Additional subsurface samples were prepared from February 16, 2021, through March 2, 2021, from archived portions of cores from the previous subsurface sampling event. Additional surface data, as requested by U.S. Environmental Protection Agency (EPA), was collected from September 20, 2021, through September 28, 2021. The work was completed under the guidelines of the approved Final Quality Assurance Project Plan (QAPP) West Side Soils Operable Unit RI Sampling Silver Bow Creek/Butte Area Superfund Site (EPA, 2019a) (referred to herein as QAPP). Sampling efforts for Atlantic Richfield Company owned and partially owned mining claims were described in the RI Statement of Work (SOW), which is included as Attachment A of the Unilateral Administrative Order (UAO) for RI Data Collection for the West Side Soils Operable Unit (OU 13) of the Silver Bow Creek/Butte Area Superfund Site (EPA 2019b) (referred to herein as WSSOU UAO). This DSR includes the analytical results of soil samples including soil paste pH, field-portable X-ray fluorescence (FPXRF), total metals, synthetic precipitation leaching procedure (SPLP), acid-base accounting (ABA), and In Vitro Bioaccessibility Assay (IVBA). Lithological layers were identified visually from each core. Not all samples received all analyses. Global Positioning System (GPS) points were collected for all locations of all collected data.
Pioneer Technical Services, Inc., "Revised Draft Final West Side Soils Operable Unit Remedial Investigation Sampling Data Summary Report" (2023). Silver Bow Creek/Butte Area Superfund Site. 451.
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