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GEOENG1NEERS Memorandum <br /> 8410 154th Avenue NE,Redmond,Washington 98052,Telephone:425.861.6000,Fax.425861.6050 www.geoerglneers.corn <br /> To: Michael Palacios,City of Everett <br /> From; GeoEngineers,Dana Carlisle PE and Jacob Letts LHG <br /> Date: December 2,2016 <br /> File: 00661-108-01 <br /> Subject: Rough Order of Magnitude(ROM)Cleanup Cost Estimate <br /> Former Smith Street Sawmill Property <br /> 3600 Smith Avenue <br /> Everett,Washington <br /> At your request we prepared a Rough Order of Magnitude (ROM) cleanup cost estimate to address <br /> contaminated soil discovered during the November 2016 Phase II ESA conducted at the former Smith Mi11 <br /> property.The Phase II ESA report is currently in progress. Please refer to the Phase I ESA report dated October <br /> 27, 2016 for a summary of the identified recognized environmental conditions and potential sources of <br /> contamination. This cost estimate assumes a future independent cleanup is conducted in general accordance <br /> with the MTCA cleanup regulation (Chapter 173-340 WAC [Washington Administrative Code]), related MICA <br /> guidance. We also assume the intent is for the cleanup to meet Ecology requirements for a No Further Action <br /> (NFA)determination under the Voluntary Cleanup Program(VCP). <br /> A Site Remedial Investigation (RI), Feasibility Study (FS) and Cleanup Action Plan (CAP) have not yet been <br /> completed for the Site.Therefore,numerous assumptions were made to develop a ROM cleanup cost estimate <br /> at this time.The assumptions are based on our best professional judgment,our experience on other Sites,our <br /> understanding of current Ecology expectations for VCP Sites,and our interpretation of site conditions based on <br /> the limited available data(recent Phase 11 ESA). <br /> Key assumptions are outlined below: <br /> Int We assume cleanup standards for the Site would be MTCA Method A cleanup levels for unrestricted land <br /> use. However,neither a Conceptual Site Model(CSM)or a Terrestrial Ecological Evaluation(TEE)have been <br /> completed for the Site,which could result in different cleanup levels and assumption regarding the level of <br /> cleanup needed. <br /> a The primary components of a soil cleanup action would be: remedial excavation to remove surface and <br /> near surface soil with concentrations of polycyiic aromatic hydrocarbons(PAHs)greater than Model Toxins <br /> Control Act (MTCA) Method A cleanup levels, and capping of isolated areas where contaminant <br /> concentations greater than cleanup levels may remain in the upper 15 feet below existing grade(bgs). The <br /> assumed maximum depth of remedial excavation is approximately 4 feet bgs. No cleanup actions are <br /> proposed specifically for groundwater, assuming that the groundwater assessment yet to be completed <br /> does not indicate contaminant concentrations requiring cleanup. <br /> ui While the Phase II ESA identified one soil sample near the north property line with a concentration of <br /> gasoline-range petroleum hydrocarbons slightly greater than the MTCA Method A cleanup level,it appears <br /> the source of this contamination is from an upgradlent off-site source and therefore the cleanup action <br /> costs presented in this memo do not include any corresponding actions for this area. <br /> ga Because of the limitations on the data set available from the Phase II ESA,likely worst-case assumptions <br /> were made regarding the quantity of soil to be removed forthe cleanup action. We assumed two contiguous <br /> Disclaimer.Anyelentronle form,facsimile or hard copy of the original document(email,text,fable,and/or figure),if provided,and enyattaohments are only a copy of the <br /> original document.The original document Is stored by GeoEngineers,Inc.and will serve as the ofOciai documentof record. <br /> 10 <br />