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8700 Thornton Road 10 • Page 2 Work Plan—Soil Boring Installation ' GPE Project No.639.2 May 18,2011 Based on groundwater monitoring data from the remedial investigation of the former ' Circle K at 8606 Thornton, the groundwater in this part of Stockton is about 30 to 35 feet below the ground surface, and flows toward the east. 2.0 PROPOSED INVESTIGATION Prior to commencing fieldwork, a drilling permit will be obtained from the San Joaquin County Environmental Health Department (EHD). An attempt will be made to identify ' any underground utilities by contacting Underground Service Alert (USA) to mark buried utility lines in an area around the tank pit. ' In order to assess the possible presence of petroleum hydrocarbons, the 3 proposed soil borings will be advanced to a depth of sufficient to penetrate below the bottom of the original tank pit to a depth of about 20 feet. The borings will be continuously cored, and ' at least one soil sample from each boring will be 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 Geo-Probe drilling equipment owned and operated by V&W Drilling, of Stockton, CA, a C-57 Licensed drilling contractor. All of the borings will be advanced to a total depth of about 20 feet below grade. Upon reaching total depth in each boring and collecting the final soil sample, the ' borings 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), and PID readings. Since the Geo-Probe is a direct-push system, no soil cuttings will be generated. ' 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295