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2 <br /> The geologist/engineer collecting samples will place approximately two ounces of soil in a <br /> resealable (i.e. ziplock) plastic bag with ample air headspace. After a minimum of five <br /> minutes at ambient temperature,the sampler will agitate the sample for ten seconds, insert <br /> the PID probe through a small opening in the plastic bag, and record the highest reading <br /> within ten seconds. <br /> Where field screening results indicate potential contamination, one soil sample will be <br /> collected from soils with the highest field screening result at each boring. Field staff will <br /> determine the number, depth and location of additional samples in the field, based on field <br /> screening results. <br /> For each boring,the samples with the highest level of organic vapors and/or most discernible <br /> visual/olfactory contamination will be shipped to the laboratory for chemical analysis. These <br /> samples will be place in pre-cleaned laboratory-provided glassware. After collection, the <br /> samples will be labeled, chilled in a cooler to 4oC, and will be submitted to the analytical <br /> laboratory within 24 hours of sampling. HWA will employ full chain-of-custody procedures <br /> to allow tracking and handling of the samples. <br /> To prevent potential cross-contamination of samples,HWA will maintain appropriate <br /> decontamination procedures. Between sampling intervals, all sampling devices and rods will <br /> be washed in a detergent solution,rinsed with tap water, and then rinsed again with de- <br /> ionized water. <br /> D. Geotechnical and Geo-Environmental Laboratory Testing <br /> HWA will perform geotechnical engineering laboratory tests on selected samples to <br /> characterize index and engineering properties of the site soils. Such tests will include natural <br /> moisture content, grain size distribution,Atterberg limits(plasticity characteristics), shear <br /> strength, and consolidation. All geotechnical testing will be completed in HWA's laboratory in <br /> Bothell, Washington. <br /> Based on field screening and environmental agency database report results, HWA retain an <br /> Ecology-accredited analytical laboratory to perform geo-environmental analytical testing <br /> on selected soil samples. The laboratory will analyze soil samples for some, any, or all of the <br /> following: petroleum hydrocarbons, volatile organic compounds (VOC's), MTCA metals, <br /> and polynuclear aromatic hydrocarbons (cPAH's). Analytical samples will be submitted for <br /> standard laboratory turnaround time. <br /> E. Geotechnical Engineering Analyses <br /> HWA will conduct geotechnical engineering analyses with respect to foundation and abutment <br /> design for the new bridge and miscellaneous foundations required for the Project. This will <br /> include analyzing laboratory test results, developing the engineering properties of the site <br /> soils, and performing the necessary geotechnical engineering calculations. HWA will <br /> evaluate appropriate foundation types and design capacities for the bridge abutments and <br /> interior piers and any miscellaneous retaining walls required on the project(i.e., VoA parking <br /> lot, Turner's building and Park). HWA will also provide foundation design parameters for <br /> the Pedestrian/Bike signal at the corner of Broadway and California. HWA will evaluate <br /> potential settlements under service loading conditions. HWA will evaluate potential <br /> 19 <br />