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1 <br /> Proposed Everett Hotel Property Environmental Site Characterization and <br /> Everett, Washington Remediation Recommendations <br /> this sample after silica gel cleanup indicated that the concentrations of petroleum constituents <br /> in the sample were below MTCA cleanup levels. Detectable concentrations of ortho-xylene <br /> and toluene were measured in the decon water generated at the time of our June 2009 field <br /> exploration. However, the concentrations of these compounds were found to be below MTCA <br /> cleanup levels. Copies of the analytical laboratory reports for the decon water testing <br /> performed are provided in Appendix B. <br /> 2.3 Previous Reports <br /> Information regarding our previous work at the site has been included in the documents listed <br /> below. <br /> 7 <br /> • Phase I Environmental Site Assessment, Proposed Everett Hotel, prepared for <br /> Touchstone Corporation, dated January 20, 2009; <br /> • Phase II Environmental Site Assessment, Everett Hotel, prepared for Touchstone <br /> Corporation, dated February 5, 2009; <br /> • Subsurface Exploration, Geologic Hazard, and Preliminary Geotechnical Engineering <br /> Report, Everett Hotel, prepared for Touchstone Corporation, dated February 10, 2009; <br /> and, <br /> • Contaminated Soil Disposal Estimate, technical memorandum prepared for the City of <br /> Everett, dated July 30, 2009. <br /> 3.0 SELECTION OF CLEANUP ACTION <br /> Two cleanup action options are presented below. Which option is selected is dependent upon <br /> future site use. The site remediation could be completed under Ecology's Voluntary Cleanup <br /> Program (VCP), which would allow issuance of a no further action (NFA) letter from <br /> Ecology. <br /> 3.1 Institutional Controls Only <br /> The area overlying the contaminated soil includes a busy street (Colby Avenue), a sidewalk, <br /> and parking lot. A brick and concrete retaining wall ranging in height from approximately 10 <br /> ' to 14 feet provides grade separation between the right-of-way and the lower-lying parking lot. <br /> This wall spans the area of contamination. Consequently, excavation of the contaminated soil <br /> would entail removal and replacement of a portion of the sidewalk, a portion of Colby Avenue, <br /> ' a portion of the parking lot, and some or all of the existing retaining wall (Figure 2). It would <br /> also likely require temporary or permanent re-routing of buried utilities that underlie this area <br /> and require temporary shoring. In addition, measured contaminant concentrations in excess of <br /> August 24, 2009 ASSOCIATED EARTH SCIENCES, INC. <br /> ' TJP/tb-KV090168A5-Projects1200901681KVIWP Page 10 <br />