Laserfiche WebLink
PRESENTATION OF CONE PENETRATION TEST DATA <br /> 1.0 INTRODUCTION <br /> This report presents the results of a Cone Penetration Testing (CPT) program carried out <br /> at the Oliveras property site, located in Stockton, CA. The work was performed on March <br /> 7, 2001.The scope of work wasperformed as directed by Foothill Engineering personnel. <br /> 2.0 FIELD EQUIPMENT & PROCEDURES <br /> The Cone Penetration Tests (CPT) were carried out by GREGG IN SITU, INC. of Martinez, <br /> CA using an integrated electronic cone system. The CPT soundings were performed in <br /> accordance with ASTM standards (D3441). A 20 ton capacity cone was used for all of the <br /> soundings. This cone has a tip area of 15 sq.cm. and friction sleeve area of 225 sq.cm. <br /> The cone is designed with an equal end area friction sleeve and a tip end area ratio of <br /> 0.85. <br /> The cones used during the program recorded the following parameters at 5 cm depth <br /> intervals: <br /> - Tip Resistance (Qc) <br /> - Sleeve Friction (Fs) <br /> - Dynamic Pore Pressure (Ut) <br /> The above parameters were printed simultaneously on a printer and stored on a computer <br /> diskette for future analysis and reference. <br /> The pore water pressure element was located directly behind the cone tip. The pore water <br /> pressure element was 5.0 mm thick and consisted of porous plastic. Each of the elements <br /> were saturated in glycerin under vacuum pressure prior to penetration. Pore pressure <br /> dissipations were recorded at 5 second intervals when appropriate during pauses in the <br /> penetration. <br /> A complete set of baseline readings was taken prior to each sounding to determine <br /> temperature shifts and any zero load offsets. Monitoring base line readings ensures that <br /> the cone electronics are operating properly. <br /> The cones were pushed using.GREGG's truck-mounted CPT rig, having a down pressure <br /> capacity of approximately 25 tons. Three (3) CPT sounding were performed. The <br /> penetration test were carried out to depths of approximately 56-125 feet below ground <br /> surface. Test location and depth was determined in the field by Foothill Engineering <br /> personnel. <br />