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It is not expected that contaminated soils will be observed at locations outside the fill area and, <br /> therefore, limited soil sampling is anticipated. However, for the purpose of this proposal, it is <br /> assumed that up to five (5) soil samples may be collected for laboratory analysis. <br /> Soil samples will be collected from the macro core finer or split spoon sampler and transferred into <br /> clean laboratory-supplied sample containers. Each sample will be given a unique identification, <br /> logged onto a formal chain-of-custody form, placed on synthetic ice in a coolers and delivered to <br /> Test America in Portland, Oregon, for analysis. Upon completion of sample collection activities the <br /> push probe or auger drilling tooling will be removed and the probe will be backfilled with bentonite in <br /> saturated zones. The surface wiH be patched with to match surrounding grade. For the purpose of <br /> this scope of work it is assumed that drilling spoils may be sidecast from the boring and will not <br /> require any special management (e.g., drummed). <br /> 1.2 Groundwater Sampling <br /> Groundwater samples will be obtained using a "screen-point"sampling tool advanced appro~umately <br /> four {4) to five (5) feet into the saturated interval. After advancing the tool, the rod assembly and <br /> sample tool outer sleeve will be retractedapproximately four (4) to five (5) feet in order to deploy a <br /> stainless steel or polyvinyl chloride (PVC) well screen to the desired sampling depth. New single- <br /> use polyethylene tubing will then be inserted to approximately two (2) inches from the bottom of the <br /> screen. The top section of the polyethylene tubing will be connected to a sufficient length of silicone <br /> tubing which will be routed through the roller system of a peristaltic pump. The pump will then be <br /> operated to pump any highly turbid water from the screen and pumping will continue until the water <br /> removed from the well point is reasonably clear and free of significant turbidity. Purge water will be <br /> collected in a bucket and transferred to a drum for on-site storage pending determination of <br /> appropriate disposal options. The drum will be labeled as to contents and accumulation date. <br /> <br /> Groundwater samples will then be collected by delivering water discharged from the tubing directly <br /> into clean, laboratory-supplied containers (with any preservative, as appropriate). Samples collected <br /> for analysis of dissolved metals will be field filtered using a 0.45 micron single use filter capsule. <br /> Each sample will be given a unique identification, logged onto a formal chain-of-custody form, <br /> placed on synthetic ice in a cooler, and delivered to TestAmerica in Portland, Oregon, for analysis. <br /> Upon completion of sample collection activities, push probe tooling will be removed and the probe <br /> wilt be backfilled with bentonite in saturated zones. The surface will be patched with cold patch <br /> asphalt, concrete, or other material as required to match surrounding grade. <br /> For the purpose of this proposal, it is assumed that up to seven (7) groundwater samples may be <br /> collected for laboratory analysis. <br /> 1.3 Soil and Groundwater Analysis <br /> The proposed analysis of soil and groundwater samples is as follows: <br /> Soil: <br /> Total Petroleum Hydrocarbons (TPH) identification using Northwest Total Petroleum <br /> Hydrocarbons (NWTPH) method NWTPH-HCID and quantification of any detected <br /> COE461SC.OSW -PROPOSAL PAGE 3 <br /> FIELD INVESTIGATIVE SERVICES FOR ENVIRONMENTAL AND GEOTECHNICAL ASSESSMENT OF FORMER GRAVEL EXTRACTION SITE <br /> AUGUS7 24, 2007 <br /> <br />