B08__A16_Drawing_Comparison_Report_0001.pdf

This document is a Forebay Record Drawing Comparison Report for the BIA-WIP Drop 1 Pumping Plant prepared by Anderson Perry & Associates in January 2023 for Jacobs. The report details a design survey conducted between October and November 2022 for a pumping plant located in the Yakama Nation, Yakama County, Washington.

The report compares three historical drawing documents showing dimensions and elevations of the forebay area, specifically examining differences between current on-site conditions and historical design documents. The survey used a Trimble GPS system for precise measurements, establishing control points and converting elevations to NAVD88 datum. Key findings include variations in bay widths (approximately 9.5 feet with 2.0-foot dividing walls), differences in intake and floor elevations, and details about the pumping plant's structural elements such as embankment top elevations, water surface levels, and structural dimensions. The report provides a technical analysis of the site's physical characteristics and historical documentation discrepancies.