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inserted through the drive rods until it is submerged in the groundwater. The teflon tube will then be connected to a peristaltic pump, which pumps the groundwater directly into sample containers. The Geoprobe®rods and the bailer will be decontaminated before each use. Fishing line and teflon tubing will be discarded after each use. The peristaltic pump does not come in contact with the sample. Thus, does not require decontamination. 5.4.2 Groundwater Well Sampling Groundwater samples will be collected from three wells located on properties surrounding the site and one well located on-site. A private well at 30010 South MacArthur and one commercial well each at Teichert Gravel Company, and at RMC Lonestar Gravel Company will be sampled. The private well at 30010 South MacArthur will be purged by attaching a garden hose to the faucet at the well head and watering the lawn for approximately 20 minutes. The garden hose will be removes prior to sampling. The well construction is not known, but the purge time of 20 minutes will meet the three well volumes needed. The two commercial wells at the gravel pits are running all the time and samples will be collected at spouts near the well heads. Water will flow directly into the appropriate sample containers with preservative, if required, then be chilled and processed for shipment to the laboratory. It is not known if the on-site well will be accessible for sampling, but should it be a Grundfos pump will be used to purge and sample the well. Vials for VOC analysis will be filled first to minimize aeration of water in the well. The vials will be inverted and checked for air bubbles to ensure zero headspace. If air bubbles appear, the vial contents will be emptied, and discarded, and a new sample will be collected. 5.5 Geological Sampling Sample locations will be selected as outlined in Section 5.6. Samples will be collected with the Geoprobe® hydraulic sampling device in accordance with EPA Environmental Response Team Standard Operating Procedure 2050 and Geoprobe® company guidance. At least four areas will be sampled for lithological information to a depth of 30 feet bgs or until refusal has occurred. The Geoprobe® Macro-Core sampling system will be used for continuous sampling to depth. Samples will be collected in acetate sleeves. When retrieved from the borehole, the sample in the sleeve will be logged by a START geologist with the Unified Soil Classification System. 09:C:\MyFiies\PROIEC RTmcy_Tire\QASP\QASP_0339.wpd-11/30/99 5-4