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9 <br /> Mr. Corbin Hammer,PE, SE SHANNON&WI SON,INC` <br /> Reid Middleton,Inc. <br /> June 1,2016 <br /> Page 3 of 5 <br /> geotechnical staff will be on-site during the mass excavation and we will coordinate with them if <br /> contaminated soils are encountered. Environmental screening will consist of visual and olfactory <br /> observations and the use of a photoionization detector. In the event soil samples are collected, <br /> they will be analyzed for contaminants of concern already identified through previous <br /> explorations. Even if contaminated soil is not identified during the environmental screening, <br /> additional analytical testing may be required based on the disposal facilities permit requirements. <br /> • For estimating costs,we have assumed that up to three additional environmental samples may be <br /> collected and that they would be analyzed for the following: <br /> • Northwest Total Petroleum Hydrocarbons(NWTPH)Hydrocarbon Identification, <br /> ■ Polychlorinated Biphenyls, <br /> • Semi-Volatile Organic Compounds, and <br /> ■ Resource Conservation and Recovery Act 8 Metals plus copper,nickel, and zinc. <br /> Follow on analyses may also be required and could consist of the following: <br /> • NWTPH Diesel and Heavy Oil-Range Hydrocarbons, <br /> • NWTPH Gasoline-Range Hydrocarbons, and <br /> ■ Toxicity Characteristic Leaching Procedure. <br /> In order to not create delays in the project,we have assumed that analytical laboratory testing <br /> would be completed on a 24-hour turnaround time. <br /> Office Review,Supervision, and Consulting Services <br /> In addition to geotechnical/environmental construction observation and dewatering system <br /> observation,office review, supervision, and consulting services will be required. Martin Page <br /> will continue as principal-in-charge and geotechnical project manager. David Randall will <br /> manage environmental portions of the work under the oversight of Scott Gaulke. They will <br /> provide consulting services, as required,such as: <br /> ■ Visiting the site to review unusual or unanticipated conditions; <br /> ■ Conducting engineering evaluations and providing recommendations as conditions <br /> dictate; <br /> ■ Attending additional project or site meetings outside of preconstruction meetings; <br /> 21-2-62763-001-LI-RevIwp/Ikn 21-2-62768-001 <br /> 140 <br />