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I Cone Penetrometer Testing Site Investigation - Fourth Quarter 2001 THREE B'S TRUCK PLAZA ' 14749 Thornton Road, Lodi, California ' 1.0. INTRODUCTION AND SCOPE OF WORK ' At the request of Mr Andy Zarakam of Three B's Truck Plaza,Advanced GeoEnvironmental, Inc (AGE)has prepared this report of findings for 14749 Thornton Road(the site),Lodi,California The report documents procedures and results for cone penetrometer testing (CPT) subsurface ' investigation conducted at the site during November 2001 (fourth quarter) The site setting is illustrated on Figure 1 Site structures and monitoring well locations are depicted on Figure 2 The objective of this CPT investigation was to characterize and assess the vertical and horizontal extent of dissolved petroleum hydrocarbons and to characterize the geologic and hydrologic framework underlying the site This report has been prepared In accordance with guidelines issued 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 was included in Preliminary Investigation and Evaluation Report(PIER), dated 05 November ' 1997 and in Site Assessment Report, dated 27 October 1998, both prepared by AGE The following is a chronology of the CPT investigation 0 26 November 2001 - Advancement of CPT soil boring a P-13 to depth of 150 feet below p surface grade (bsg), collect grab water samples from P-13 at selected depths a 27 November 2001 - Advancement of CPT soil boring P-14 to a depth of 118 feet bsg, collect grab water samples from P-14 at selected depths • 28 November 2001 -Advancement of CPT soil borings P-15 and P-16 to depths of 150 feet and 117 feet bsg, respectively, collect grab water samples from P-15 at selected depths • 29 November 2001 - Advancement of CPT soil boring P-17 to a depth of 119%2 feet bsg, collect grab water samples from P-16 and P-17 at selected depths • 30 November 2001 - Advancement of CPT soil boring P-18 to a depth of 136'/2 feet bsg, collet grab water samples from P-17 and P-18 at selected depths 2.0. CPT SOIL BORINGS On 26, 27, 28, 29 and 30 November 2001, six soil borings (P-13, P-14, P-15, P-16, P-17 and P-18) were advanced on-site utilizing CPT technology to characterize the geological and hydrologic framework and to identify potential contaminant-migration pathways beneath the site Based on CPT lithologic sounding data collected at P-13, P-14, P-15, P-16, P-17 and P-18, depth- Advanced GeoEnvironmental,Inc I