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' Work Plan-Soil Boring Installation Page 2 461 Powers, Manteca Project 408 May 9, 2003 ' 2.1 Field Work The field work associated with this work plan will consist of obtaining the required San ' Joaquin County Permit to install soil borings at the site. Upon obtaining the proper Permit, Geo-Phase Environmental will install two soil borings using a Geo-Probe drilling rig, collecting soil and groundwater samples, and delivering all groundwater and soil samples to ' an analytical laboratory licensed by the State of California for hazardous materials work. The groundwater samples, one from each of the two borings, shall be analyzed for Total Extractable Petroleum Hydrocarbons (TEPH), which will be handled according to the "Chain ' of Custody"requirements specified in the LUFT guidelines. 2.1.1 Geo-Probe Soil Borings 1 The soil borings will be installed using 1.5" outside diameter Geo-Probe drilling equipment owned and operated by V & W Drilling (C-57 License #720904). The Geo-Probe is a truck tmounted 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 hydraulically 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. ' Upon reaching total depth in each boring and collecting the final soil or groundwater sample, the borings will be filled to grade with neat cement. 2.1.2 Geology ' A detailed log will be made of each boring. The information to be noted include such data as sample depths, soil / sediment type and description (color, texture, composition, hardness, moisture content, and post-depositional changes that have occurred in the sediments), and ' horizons of detectable contamination (detected by field methods). ' 2.2 Soil Sampling and Analyses The soil sample collection procedure will be as follows. Upon retrieval, the end of each ' plastic sample tube removed from the coring device and possibly submitted for laboratory analysis will be sealed with Teflon sheets or aluminum foil, capped with plastic end caps, secured with tape, labeled, and placed in a cooler at 4° Celsius for transport to the laboratory ' using Chain of Custody protocol. Chain of Custody (C of C) forms are documents used to track the handling of samples. All dates, times, persons and companies handling the samples are listed from the time the samples are collected to their ultimate disposal. 2937 Veneman Avenue, Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto, Ca 95356 Fax: (209) 569-0295