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Cone Penetrometer Testing Report <br /> SUTTER OFFICE CENTER <br /> 242 North Sutter Street and 448 East Miner Avenue <br /> Stockton, California APN 139-250-05 <br /> 10 INTRODUCTION <br />' At the request of Ms Juli Lozano of the Sutter Office Center, Advanced GeoEnvironmental, Inc <br /> (AGE) has prepared this report for 242 North Sutter Street, Stockton, California The report <br /> Idocuments procedures and results for a cone penetrometer testing(CPT)investigation conducted at <br /> the site during April 2003, the objective of the investigation was to model the geologic and <br /> I hydrogeologic frameworks and to assess potential dissolved petroleum-migration pathways beneath <br /> the site The site setting is illustrated on Figure 1, site structures,boring, monitoring well and CPT <br /> locations are depicted on Figure 2 <br />' This report is prepared in accordance with guidelines issued by the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites <br /> Background information, including details of previous site assessment work, is presented in <br /> Appendix A <br />�• 2.0. PROCEDURES <br /> On 09 to 11 April 2003, five soil borings(CPT-1 to CPT5)were advanced on-and off-site(Figure 2) <br /> utilizing CPT technology, at each boring location,lithologic data was collected from the initial CPT <br /> boring,an immediately adjacent twin boring was then advanced at each CPT location to collect grab <br /> ground water samples from selected depths <br /> 21 CPT LITHOLOGIC INVESTIGATION <br /> The CPT investigation utilized a 25-ton truck-mounted CPT drill rig equipped with 1 50-inch <br /> diameter hollow-stem rods A hydraulic ram was utilized to advance a piezocone(cone penetrometer <br /> with pore pressure measurement) attached to the hollow-stem rod assembly to total depth of each <br /> soil boring, a piezocone illustration is provided in Appendix B <br /> Soil borings for sounding were as follows <br /> • CPT1 was established in the vicinity of monitoring well MW-1 and soil borings A and I to <br /> a depth of 150 feet below surface grade (bsg), <br /> I & CPT2 was established in the vicinity of soil borings B and J to a depth of 160 feet bsg, <br /> . R CPT-3 was established west of boring C to a depth of 160 feet bsg, <br /> IAdvanced Geo Environmental,Inc <br /> I <br />