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PRESENTATION OF CONE PENETRATION TEST DATA <br /> ' 1.0 INTRODUCTION <br /> ' This report presents the results of a Cone Penetration Testing (CPT) and in situ <br /> groundwater sampling program carried out at the Diamond Walnut Growers site located <br /> in Stockton, CA The work was performed on October 1St, 2002 The scope of work was <br /> ' performed as directed by ATC personnel <br /> 2.0 FIELD EQUIPMENT & PROCEDURES <br /> The Cone Penetration Tests CPT were carried t <br /> (CPT) out by GREGG IN SITU, INC1NC o <br /> Martinez, CA using an integrated electronic cone system The CPT soundings were <br /> performed in accordance with ASTM standards (D 5778-95) A 20 ton capacity cone <br /> was used for all of the soundings (figure 1) This cone has a tip area of 15 cm2 and <br /> friction sleeve area of 225 cm2 The cone is designed with an equal end area friction <br />' sleeve and a tip end area ratio of 0 85 <br />' The cones used during the program recorded the following parameters at 5 cm depth <br /> intervals <br /> - Trp Resistance (qc) <br /> - Sleeve Friction (fs) <br /> - Dynamic Pore Pressure (U) <br />' The above parameters were printed simultaneously on a printer and stored on a <br /> computer diskette for future analysis and reference <br />' The pore water pressure element was located directly behind the cone tip The pore <br /> water pressure element was 5 0 mm thick and consisted of porous plastic Each of the <br /> elements were saturated in silicon oil under vacuum pressure prior to penetration Pore <br /> pressure dissipations were recorded at 5 second intervals when appropriate during <br /> pauses in the 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 <br />' that the cone electronics are operating properly <br /> The cones were pushed using GREGG IN SITU's CPT rig, having a down pressure <br />' capacity of approximately 20 tons Two CPT soundings were performed The <br /> penetration tests were carried to depths of approximately 160 feet below ground <br /> surface, Test locations and depths were determined in the field by ATC personnel <br />