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Work Plan-Phase IIA LSA Page 2 <br /> Former Karlson Trucking Facility <br /> Project No. 191.2 <br /> September 22, 1998 <br /> 2.0 PROPOSED INVESTIGATION <br /> 2.1 Soil Boring Installation <br /> 2.2.1 Soil Boring Installation <br /> Geo-Phase Environmental Inc. proposes to install a group of 7 Geo-Probe soil <br /> borings into groundwater to an anticipated depth of 25 feet below grade. It is <br /> assumed that groundwater will be encountered at ±20 feet below grade. <br /> These borings will be located as follows: <br /> • Three associated with a possible underground storage tank location near <br /> the entrance to the site. <br /> • Three near a possible underground storage tank location between the pole <br /> barn and main repair building <br /> • One through the former waste retention pond which is now used for storm <br /> water disposal. If it is not possible to drive the drilling rig into the pond, <br /> a boring will be completed adjacent to the pond. <br /> The Geo-Probe soil borings will be drilled using 1.5" outside diameter Geo- <br /> Probe drilling equipment owned and operated by V & W Drilling (C-57 <br /> License #720904). Upon reaching total depth in each boring and collecting a <br /> final soil and groundwater sample, the boring was filled to grade with neat <br /> cement. <br /> The Geo-Probe is a truck mounted drilling system that uses direct push <br /> methodology to collect soil and groundwater samples. Four foot long by 1.5 <br /> inch diameter stainless steel rods are pushed or hammered into the ground <br /> using a hydraulic ram or the hydraulically actuated hammer mounted on the <br /> ram. Soil samples are collected using a 1.5 foot long by 1.5 inch inside <br /> diameter drive sampler lined with a plastic sample sleeve. This device is <br /> activated by removing a retaining bolt from the top of the device by inserting <br /> rods through the hollow stem of the probe rods. Removing this retaining bolt <br /> allows the drive point to retract through the sampling tube and a sample to <br /> be collected. <br /> A detailed log will be made of each boring. The information to be noted <br /> include such data as sample depths, blow counts from hammer driven <br /> sampling devices, horizons of detectable contamination (detected by field <br /> methods), soil classification utilizing the Unified Soil Classification System <br /> and sediment description (color, texture, composition, hardness, moisture <br /> content, and post-depositional changes that have occurred in the sediments). <br /> 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto, Ca 95356 Fax: (209)569-0295 <br />