FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

i ' - I Cone Penetrometer Testing Report - March 2001 ' CURTISS PONTIAC-BUICK 2450 Toste Road, Tracy, California ■ 1.0. INTRODUCTION AND SCOPE OF WORK IAt the request of Mr Joe Toste, Jr of Tracy Marine Sales, Advanced GeoEnvironmental, Inc (AGE), has prepared the enclosed cone penetrometer testing (CPT) report for 2450 Toste Road, Tracy, California The report documents procedures and results for a subsurface investigation ' conducted at the site during March 2001 The site setting is Illustrated on Figure 1 Site structures, boring, monitoring well and CPT locations are depicted on Figure 2 ' The objective of the CPT investigation was to characterize and assess petroleum hydrocarbons in ground water and to characterize stratigraphy at the site This report is prepared in accordance with I guidelines established by the California Regional Water Quality Control Board - Central Valley Region (RWQCB) for investigation of underground storage tank (UST) sites A summary of previous investigations at the site and background information is included in the AGE-prepared ' Additional Site Assessment Work Plan, dated 30 October 2000 and Quarterly Report -December 1999, dated 14 February 2000 I• 2.0. PROCEDURES On 13 March 200I, two soil borings (CPT-1 and CPT-2) were advanced on-site utilizing CPT technology to model the geological and hydro-geological framework and to assess the vertical extent of dissolved petroleum-hydrocarbons beneath the site Lithologic data was collected from an initial ' CPT soil boring in each locality, a twin boring was then advanced to collect grab ground water samples from selected depths Boring logs are presented in Appendix A, a site plan depicting boring locations is presented In Figure 2 I 21 CPT LITHOLOGIC INVESTIGATION ISoil borings CPT-1 and CPT-2 were advanced vertically to a maximum depth of 70 feet below I surface grade(bsg),utilizing a 25-ton truck-mounted CPT drill ng equipped with 1 50-inch diameter hollow-stem rods A hydraulic ram was utilized for each CPT soil boring to advance a cone penetrometer tip to total depth of the soil boring Soil parameters such as cone penetrometer tip I resistance, sleeve friction, friction ratio (ratio between sleeve friction and tip resistance) and pore water pressure were continuously measured as the cone penetrometer was advanced to depth A continuous boring log was generated utilizing the Hogentogler Co CPT computer program The Hogentogler Co computer program utilized the CPT Soil Behavior Classification System (Robertson, P K,Campanella,R G,Gillespie,D and Greig,J, 1986)to generate a general hthology • type and display on a CPT boring log(See Appendix A) Rinseate generated during this investigation Advanced GcoEnvironmental,Inc