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ush <br /> es Inc. <br /> CALIFORNIA PUSH ca104C Pmotion nologiuim2 <br /> • 104 Consfilulfon Drive Sulk 2 <br /> - <br /> TECHNOLOGIES Menlo Palk 94025 <br /> T <br /> I N C O R P O R A T E D IC 51 tkan.118848111 <br /> office:650 854 0300 <br /> lox:650 854 0301 <br /> w .cplinc.com <br /> • <br /> Cone penetration testing and soil sampling, methods description. <br /> Rie Description <br /> Our services are based on the state-of-the-art, Geoprobe Model 6625CPT rig,a limited-access, <br /> • self-anchoring,20-ton push capacity, track-mounted push platform for dedicated Geotechnical <br /> CPT applications with the unique and valuable added ability to quickly perform intermittent or <br /> continuous soil sampling. <br /> Weight=—9,500 pounds <br /> Surface load=—4.5 psi <br /> • Push capacity=—20 tons;self-anchoring achieved using 10-or 15-inch diameter helical soil <br /> anchors driven 4-to 10-feet into the soil <br /> Sampling hammer percussion rate=32 Hz&20,000 lbs force/blow <br /> Length =— 12 feet; Width=—7 feet <br /> Height(folded)=7 feet; Height(unfolded)= 14 feet <br /> • CPT Description <br /> Our Geoprobe 6625CPT incorporates the Swedish-made Geotech AB Cone Penetration Testing <br /> tools which meet the ASTM D-5778 Standard Test Method for Performing Electronic Friction <br /> Cone and Piezocone Penetration Testing of Soils. Cones have 10 cm2 tips and 150 cm2 friction <br /> sleeves,and include a porous filter and pressure sensor located in the u2 position directly behind <br /> • the cone. The cone and porous filter are saturated under vacuum with glycerin to promote rapid <br /> equilibration with in-situ pore pressures. Cones are advanced at the ASTM standard rate of 2 <br /> cm/second. Baseline readings are performed both before and after each push to check for load <br /> cell drift. The cone measures bearing(max load= 100 MPa— 1044 TSF), friction sleeve(max <br /> load= 1.0 MPa— 10.4 TSF), and dynamic pore pressure(max load=2.5 MPa—363 psi)at 2 cm <br /> or 4 cm intervals(client's choice)and this data is plotted in real-time and recorded on a laptop <br /> • computer adjacent to the push platform. Holes are grouted upon completion of each push,or at <br /> the end of each day,as site conditions and regulations warrant. <br /> The basic equation to determine the depth to the free water surface from the pore pressure <br /> dissipation test is; <br /> • Depth to phreatic surface=[Dissipation depth]—[equilibrium pore pressure/unit weight of H2O <br /> x unit conversation factor] <br /> ...where; <br /> • 1) Surface elevation is always assumed to be 0 feet <br /> 2) Dissipation depth=the depth(feet)below surface elevation where the cone advancement <br /> was paused while waiting for equilibrium pore pressure to be achieved <br /> 3) Equilibrium pore pressure=the pore pressure after an elapsed time where no increase or <br /> decrease in pore pressure is occurring, in pounds per square inch(psi) <br /> 4) Unit weight of water=62.3 pounds per cubic foot(lb/ft^3) <br /> • 5) Unit conversion factor(for dimensional analysis): 1 psi= 144 Ib/ft^3 <br /> CPT Inc.methods description.doc June 25,2008 <br /> • <br />