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Work Plan—Soil Boring Installation Page 3 Russell Property Project 191.2 December 13,2000 2.0 PROPOSED INVESTIGATION The purpose of conducting this work is to define the extreme lateral limit of detectable hydrocarbon contamination associated with this plume. Geo-Phase Environmental Inc. proposes to install two Geo-Probe soil borings to collect soil and groundwater samples from the suspected distal periphery of the groundwater plume. One boring will be situated near the suspected extreme down-gradient position, and the other boring will be located southwest of the distal end of the plume. Soil and groundwater samples will be collected at discrete intervals in both borings, and the samples will be submitted for analytical testing for the possible presence of diesel range petroleum hydrocarbons. 2.1 Field Work The field work associated with this work plan will consist of mobilizing to the site with a Geo-Probe drilling rig and advancing two soil borings at designated locations for the purpose of obtaining soil and groundwater samples. 2.1.1 Geo-Probe Soil Borings A group of two Geo-Probe soil borings will be advanced about 10 feet into the saturated zone to an anticipated depth of 20 feet below grade. We assume that groundwater will be encountered at±9-11 feet below grade. These borings will be located as follows: • SB-13 to be located northwest of MW-6 to determine the distal extent of the groundwater plume, • SB-14 to be located southwest of MW- to define the southwesterly limit of the distal end of the plume. Both soil and groundwater samples will be collected from three discrete points in each boring. The sample points will be located (as nearly as possible) at the capillary fringe, from 4 to 5 feet below first water, and from about 10 feet beneath first water(est. +20'). The soil borings will be drilled using 1.5" outside diameter Geo-Probe drilling equipment owned and operated by V & W Drilling (C-57 License #720904). Both borings will be advanced to a total depth of about 20 feet below grade. Upon reaching total depth in each boring and collecting a final soil and groundwater sample, the boring will be 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 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 2937 Veneman Avenue,Suite B240 Geo-Phase Environmental Inc. Phone: (209)569-0293 Modesto,Ca 95356 Fax: (209)569-0295