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2441 W,Charter Way ® Page 4 Work Plan—Soil Boring Installation GPE Project No.667.2 June 21,2013 2.0 PROPOSED INVESTIGATION Prior to commencing fieldwork, a drilling permit will be obtained from the San Joaquin County Environmental Health Department(ED). In order to assess the possible presence of petroleum hydrocarbons, the 24 proposed soil borings will be advanced to a depth of sufficient to penetrate the groundwater surface at about 10 to 14 feet. The borings will be logged and samples will be collected and it is expected that laboratory analysis will be performed on a limited number of the samples. Actual field conditions could result on modification of the number and depth of some proposed soil borings. A notation of the location of each soil boring will made using a Garmin GPS instrument capable of 3-meter accuracy. Upon completion of the fieldwork, a report will be prepared and submitted which describes this work, and provides information regarding the true footprint of the landfill area, and results of the laboratory analysis. 2.1 Soil Boring Installation The soil borings will be drilled using 1.5" outside diameter dual-tube, track-mounted Geo-Probe drilling equipment owned and operated by PeneCore Drilling, of Woodland, CA, a C-57-Licensed drilling contractor. During drilling, the outer tube acts as a temporary casing to prevent the hole from collapsing and also prevents volatile gasses from entering the poring and then the atmosphere. The borings will be advanced to a depth sufficient to penetrate the groundwater surface or the base of the fill material as determined by field methods. Upon reaching total depth in each boring and collecting the final soil sample,the borings will be filled to grade with neat cement grout. The Geo-Probe is a truck mounted drilling system that uses direct push methodology to collect soil and groundwater samples. Four-foot long steel rods are pushed or hammered into the ground using a hydraulic ram or the hydraulically actuated hammer mounted on the ram. The soil boring process will necessitate piercing the landfill cover with small diameter hole less that 2 inches in diameter. Upon completion of each boring, the boring will be filled with Class A/B cement grout to within 3 feet of the surface. This step will prevent the boring from acting as a conduit for possible contaminants to enter the groundwater. The upper 2 to 3 feet of the boring will then be filled with bentonite chips and then hydrated. This will restore the integrity of the landfill cap and return it to original or better condition. 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295