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Phase IIA Environmentai cite Assessment Page 3 Former Karlson Trucking Property Project No. 191.2 October 28, 1998 2.1.3 Shallow Soil Sampling-Oil Sump On October 15, 1998 one shallow hand augered soil boring was completed adjacent to an oil sump at the site. This boring was completed to a total depth of ten feet below ground surface. Groundwater was encountered at approximately 9.5 feet below ground surface in this boring. Two soil samples were collected from this boring at the five and ten foot sampling interval (see site map for boring locations and section 3.0 for field observations and analytical data). 2.2 Geo-Probe Soil Borings On October 13, 1998 seven Geo-Probe soil borings were completed at various locations at the site (see Figure 3). These borings were drilled using a 1.5" outside diameter Geo-Probe drilling equipment owned and operated by V & W Drilling (C-57 License #720904). Upon reaching total depth in each boring and collecting the final soil and a groundwater sample, the boring was filled to grade with neat cement. The Geo-Probe is a truck mounted drilling system that uses direct push methodology to collect soil and groundwater samples. Four foot long by 1.5 inch diameter stainless steel rods are pushed or hammered into the ground using a hydraulic ram or the hydraulic actuated hammer mounted on the ram. Soil samples are collected using a 1.5 foot long by 1.5 inch inside diameter drive sampler lined with a plastic sample sleeve. This device is activated by removing a retaining bolt from the top of the device by inserting rods through the hollow stem of the probe rods. Removing this retaining bolt allows the drive point to retract through the sampling tube and a sample to be collected. Groundwater samples are collected using the Geo-Probe's groundwater sampling device. This consists of a four foot long hollow rod fitted with a drive point which is attached to the end of the Geo-Probe stem. This rod is driven four feet into groundwater and retracted to expose the stainless steel screen inside of the device. The soil and groundwater sample collection procedures are described in Section 2.3, the site's geologic conditions are discussed in Section 3.1. and analytical results are included in Section 3.2. 2.3 Soil and Groundwater Sample Collection Procedures Each soil sample collected for possible analytical evaluation was preserved for laboratory analysis as follows. Nitrile gloves were worn during the entire 2937 Veneman Ave.,#B240 Geo-Phase Environmental Inc. Phone (209) 569-0293 Modesto, CA 95356 Fax(209) 569-0295