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PRESENTATION OF CONE PENETRATION TEST DATA 1.0 INTRODUCTION This report presents the results of a Cone Penetration Testing (CPT) and in situ soil & groundwater sampling program carried out at the Arco #5469 site located in Stockton, CA. The work was performed on November 18th and 19tH 2002. The scope of work was performed as directed by Stratus personnel. 2.0 FIELD EQUIPMENT & PROCEDURES The Cone Penetration Tests (CPT) were carried out by GREGG IN SITU, INC. of Martinez, CA using an integrated electronic cone system. The CPT soundings were performed in accordance with ASTM standards (D 5778-95). A 20 ton capacity cone was used for all of the soundings (figure 1). This cone has a tip area of 15 cm2 and friction sleeve area of 225 cm2. The cone is designed with an equal end area friction sleeve and a tip end area ratio of 0.85. The cones used during the program recorded the following parameters at 5 cm depth intervals: - Tip Resistance (qc) - Sleeve Friction (fs) - Dynamic Pore Pressure (U) The above parameters were printed simultaneously on a printer and stored on a computer diskette for future analysis and reference. The pore water pressure element was located directly behind the cone tip. The pore water pressure element was 5.0 mm thick and consisted of porous plastic. Each of the elements were saturated in silicon oil under vacuum pressure prior to penetration. Pore pressure dissipations were recorded at 5 second intervals when appropriate during pauses in the penetration. A complete set of baseline readings was taken prior to each sounding to determine temperature shifts and any zero load offsets, Monitoring base line readings ensures that the cone electronics are operating properly. The cones were pushed using GREGG IN SITU's CPT rig, having a down pressure capacity of approximately 20 tons. One CPT sounding was performed. The penetration test was carried to a depth of approximately 120 feet below ground surface. Test locations and depths were determined in the field by Stratus personnel.