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15671 Lower Sacramento Road Page 2 Work Plan—Soil Boring Installation GPE Project No.593 October 21,2008 2.0 PROPOSED INVESTIGATION Prior to commencing fieldwork, a drilling permit will be obtained from the San Joaquin County Environmental Health Department (SJC-EHD). In order to assess the possible presence of petroleum hydrocarbons, the 9 proposed soil borings will be advanced to a depth of about 20 feet. Soil samples will be collected from each boring and submitted for laboratory analytical testing. Upon completion of the field and laboratory work, a report will be prepared and submitted which describes this work, its findings and implications. 2.1 Soil Boring Installation The soil borings will be drilled using 1.5" outside diameter dual-tube Geo-Probe drilling equipment owned and operated by RSI Drilling, of Woodland, CA, a C-57 Licensed drilling contractor. All of the borings will be advanced to a total depth of about 20 feet below grade, and are not expected to penetrate the groundwater surface. Upon reaching total depth in each boring and collecting a final 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. A detailed log will be made of the borings. The information to be noted includes such data as sample depths, horizons of detectable contamination (detected by field methods), soil classification utilizing the Unified Soil Classification System and sediment description (color, texture, composition, hardness, moisture content, and post- depositional changes that have occurred in the sediments). Since the Geo-Probe is a direct-push system, no soil cuttings will be generated. 2.2 Sampling and Analyses While drilling, each boring will be continuously sampled. Soil samples will be screened using field methods by observing discoloration and odor. If no field evidence of vadose zone contamination is found, soil samples are unlikely to be submitted for laboratory analysis except the sample from the bottom of each boring. Soil samples are collected using a 4-foot long by 1.5 inch inside diameter drive sampler lined with a plastic sample sleeve. Upon retrieval, soil samples at 4-foot intervals will be logged and sample material retained for possible laboratory analysis will be sealed with 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295