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Cone Penetration Testing Procedure <br /> (CPT) <br /> Gregg In Situ, Inc carnes out all Cone Penetration Tests (CPT) using an integrated electronic <br /> cone system, Figure CPT The soundings are conducted using a 20 ton capacity cone with a tip <br />' area of 15 cm2 and a friction sleeve area of 225 cm2 The cone is designed with an equal end <br /> area friction sleeve and a tip end area ratio <br /> Of 0 85 <br /> The cone takes measurements of cone Geophones <br /> bearing (qj, sleeve friction (f6) and (VS&Vp) <br />' dynamic pore water pressure (uz) at 5-cm Push rod <br /> intervals during penetration to provide a connector <br />' nearly continuous hydrogeologic log CPT <br /> data reduction and interpretation is Soil seal <br /> performed in real time facilitating on-site Electric cable for <br />' decision making The above mentioned signal transmission <br /> parameters are stored on disk for further <br /> analysis and reference All CPT soundings Water Seal <br />' are performed in accordance with revises! <br /> Friction load cell <br /> (2002)ASTM standards(D 5778-95) <br /> Frlctln SIEEVe <br />' ! The cone also contains a porous filter Inclinometer <br /> element located directly behind the cone (�x ') <br /> tip (u2), Figure CPT It consists of porous Tip load cell <br /> plastic and is 5 Omm thick The filter <br /> element is used to obtain dynamic pore <br /> pressure as the cone is advanced as well <br /> as Pore Pressure Dissipation Tests Water Seat <br /> (PPDT's) during appropriate pauses in Soli seal <br /> rpenetration It should be noted that prior to Pore Pressure <br /> penetration, the element is fully saturated Transducer (q) <br /> ) <br />' with silicon oil under vacuum pressure to p load cell Filter <br /> Q <br /> ensure accurate and fast dissipation <br /> Figure CPT Cone Tip (qc) <br /> When the soundings are complete, the test <br /> holes are grouted using a Gregg In Situ support rig The grouting procedure consists of pushing <br /> a hollow CPT rod with a "knock out' plug to the termination depth of the test hole Grout is then <br />' pumped under pressure as the tremae pipe is pulled from the hole Disruption or further <br /> contamination to the site is therefore minimized <br />' <br /> 2726 Walnut Avenue Signal Hill Califomia 90755 Phone (562)427-6899 Fax (562)427-3314 <br />' E Web Site www greggdnlhng com Email info@greggdrilling com <br /> Additional locations in Charleston Houston Palo Alto Salt Lake City San Francisco Vancouver <br />