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collection device is driven. If more than one sample or type of sample <br /> is required, several different sample collection devices can be <br /> sequentially driven down the same hole. <br /> A geologist will prepare a lithologic log of each Geoprobe location <br /> using the Unified Soil Classification System (USCS). All Geoprobe <br /> holes will be backfilled with neat cement. <br /> Geoprobe Soil Sampling Methodolosv <br /> Soil core sampling is conducted using 5-foot sections of <br /> decontaminated 3/4-inch I.D. galvanized steel probe pipe. The probe <br /> pipe is connected to a 1-foot galvanized steel soil core tube. Solid <br /> _ stainless steel decontaminated insert rods are placed through the probe <br /> pipe and sampling core. The probe pipe, soil core, and insert rods are <br /> pneumatically driven to the depth the soil sample is desired. The <br /> insert rods are removed and the probe pipe and core tube is driven 1- <br /> foot to obtain the soil core sample. The probe pipe containing soil <br /> sample is removed from the hole and the soil sample is disconnected <br /> from the probe pipe. The core can be cut into smaller cores for <br /> lithologic evaluation, field screening, and chemical analyses. The ends <br /> of the core for analyses are sealed using teflon tape and plastic end caps. <br /> The sample is labeled with project name, date, time of sample, <br /> designated sample location, and other pertinent information. The <br /> sample is placed in an air tight bag and stored in an iced cooler or <br /> presented to the mobile analytical laboratory. <br /> Geoprobe Groundwater Sampling_Methodology <br /> Groundwater sampling is conducted using a 6-foot long section of <br /> decontaminated 3/4-inch I.D. perforated or slotted galvanized steel <br /> probe pipe (hydroprobe). The hydroprobe is connected to 5-foot <br /> sections of probe pipe, as required. Decontaminated insert rods are <br /> placed through the probe pipe and pneumatically driven into the <br /> aquifer or saturated zone. Several development techniques may be <br /> used to encourage flow into the perforated probe, if necessary. <br /> Groundwater samples are collected using decontaminated stainless <br /> steel bailers and placed into containers provided by the analytical <br /> laboratory. The containers are labeled with the project name, date, <br /> time of sample, designated sample location, and other pertinent <br /> information. The containers are placed in an iced cooler or presented <br /> to the mobile analytical laboratory. <br /> 4-4 <br />