Remedial Action Report Construction Phase

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REMEDIAL ACTIONS REPORT CONSTRUCTION PHASE Courthouse Square - Salem, Oregon ~ 1.0 INTRODUCTION Century West Engineering Corporation (Century West) was retained by Marion County to conduct site investigation and remedial actions for the Courthouse Square project located in downtown Salem, Oregon (Figure 1). The project involves redevelopment of an entire city block. In the summer of 1997, surface structures on the Courthouse Square property were demolished, including buildings, parking structures, and paved areas. Currently, a subterranean parking structure is being constructed to a depth of approximately ten feet below street grade extending throughout the block. Above ground, the southern portion of the site will be developed for office/retail use. The central portion of the site will be developed as a transit mall. The northern portion will be left for future development and may include residential units. This document summarizes remedial actions conducted during the initial phase of construction between March 15, 1999 and August 5, 1999. The construction phase remedial actions were completed in accordance with Century West's Remedial Action Plan (Century West 1999a). The purpose of the construction phase remedial actions was to manage environmental issues on the Courthouse Square property in accordance with state and local regulations and secure a"no further action" determination for the property from the Oregon Department of Environmental Quality (DEQ). Specific objectives of the construction phase remedial actions included: 1) ensuring worker safety related to subsurface contamination, 2) characterizing the nature and extent of subsurface contamination, 3) managing water generated during construction dewatering operations, 4) managing the excavation, transport, and disposal of contaminated soil, and 5) evaluating the risk associated with potentially contaminated soil and/or groundwater left in place. 2.0 SITE DESCRIPTION 2.1 Site Setting The site is an approximately 2.5-acre, square-shaped parcel of land located in downtown Salem. The property is bounded to the north by Chemeketa Street, to the east by Church Street, to the south by Court Street, and to the west by High Street (Figure 1). The property is located in Sections 22 and 27, Township 7 South, Range 3 West of the Salem West Quadrangle. Construction Phase - Remedial Actions - 1- 4080600127 Courthouse Squaze November 9, 1999