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City of Everett Point Industrial Center (EPIC) Bridge Project – Phase 2 Full Design <br /> <br /> Page 9 of 43 <br /> <br />iv. Semivolatile organic (SVOCs) with low level polycyclic aromatic hydrocarbons <br />(PAHs) via test method EPA 8270E/SIM <br />v. Polychlorinated biphenyls (PCBs) via EPA test method 8082A <br />vi. Total metals (11 analytes) Ag, As, Ba, Cd, Cr, Hg, Pb, Se, Cu, Ni, Zn via EPA <br />test method EPA 6010D/6020B/7471B (soil only) <br />vii. Dissolved metals (11 analytes)* Ag, As, Ba, Cd, Cr, Hg, Pb, Se, Cu, Ni, Zn via <br />EPA test method EPA 200.7/200.8/7470A (groundwater only) <br />viii. Soluble hexavalent chromium** via test method EPA 7196A <br />ix. Toxicity Characteristic Leaching Procedure (TCLP) Metals** via EPA test <br />method EPA 13116010D/7470A <br />*Water will be filtered with a 0.45 µm filter before it is introduced to sample containers for dissolved <br />metals analysis. <br />**Based on initial analytical results, follow-up analysis for hexavalent chromium, and/or TCLP may <br />be conducted. <br />c) Samples will be submitted for standard laboratory turnaround time, which is <br />approximately 7 to 10 business days. Follow-up analyses, based on initial analytical <br />results (i.e., additional testing requested for hexavalent chromium, and/or TCLP <br />follow-up analysis) may result in a total standard turnaround time of up to 3 weeks. <br />Faster turnaround times are available at increased cost. <br />d) Soil cuttings, purged groundwater (if encountered), and decontamination water from <br />borings will be placed in steel 55-gallon drums. These investigation-derived waste <br />(IDW) drums will be stored on-site, or at a location within three miles of the site, <br />pending chemical analysis. Once laboratory results for the environmental samples are <br />obtained, HWA will coordinate the disposal of drummed IDW using a waste disposal <br />subcontractor. Waste profile documentation required for disposal of the IDW will <br />need to be signed by an AGENCY representative. <br /> <br />3.3 Geotechnical Engineering Analysis <br /> Update Geologic Cross Sections:HWA will update the geologic cross-sections <br />developed as part of the existing TS&L study. The updates will consist of including the <br />supplemental subsurface information collected as part of this scope of work. <br /> <br /> Revise AASHTO Seismic Design Parameters:HWA will revise the seismic design <br />parameters based on the latest AASHTO Specifications for Roads and Bridges. Shear <br />wave velocity measurements collected for the TS&L study will be used to identify the <br />site class. The revised seismic design parameters will be different than the parameters <br />used in the TS&L study due to changes in the AASHTO code. <br /> <br /> Update Soils for Liquefaction and Lateral Spread Potential: HWA will evaluate the <br />susceptibility to liquefaction of the soils along the bridge alignment based on the updated <br />seismic design parameters and the supplementary explorations. Once the susceptibility to