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Cole Penetration Test Data & Interpretation The Cone Penetration Test(CPT) data collected from your site are presented in graphical form in the attached report. The plots include interpreted Soil Behavior Type (SBT) based on the charts described by Robertson (1990). Typical plots display SBT based on the non-normalized charts of Robertson et al (1986). For CPT soundings extending greater than 50 feet, we recommend the use of the normalized charts of Robertson (1990)which can be displayed as SBTn, upon request. The report also includes spreadsheet output of computer calculations of basic interpretation in terms of SBT and SBTn and various geotechnical parameters using current published correlations based on the comprehensive review by Lunne, Robertson and Powell (1997), as well as recent updates by Professor Robertson. The interpretations are presented only as a guide for geotechnical use and should be carefully reviewed. Gregg InSitu and Gregg Drilling & Testing Inc. do not warranty the correctness or the applicability of any of the geotechnical parameters interpreted by the software and do not assume any liability for any use of the results in any design or review. The user should be fully aware of the techniques and limitations of any method used in the software. Some interpretation methods require input of the groundwater level to calculate vertical effective stress. An estimate of the in-situ groundwater level has been made based on field observations and/or CPT results, but should be verified by the user. A summary of locations and depths is available in Table 1. Note that all penetration depths referenced in the data are with respect to the existing ground surface. Note that it is not always possible to clearly identify a soil type based solely on q,,f, and uz. In these situations, experience, judgment, and an assessment of the pore pressure dissipation data should be used to infer the correct soil behavior type. (After Robertson, et aL, 1986) IWO ZONE SBT 10 i 12 1 Sensitive,fine grained 11 Cl 9 2 Organic materials 3 Clay 100 �/8 4 Silty clay to clay 5 Clayey silt to silty clay � 6 Sandy silt to clayey silt 7 Silty sand to sandy silt low 9 8 Sand to silty sand 9 Sand t ` 10 Gravely sand to sand 11 Very stiff fine grained* > 2 12 sand to clayey sand* 1 0 1 2 3 4 5 8 7 8 *over consolidated or cemented Friction Ratio (°6), Rf Figure SBT �G 2726 Walnut Avenue- Signal Hill California• 90755 Phone: (562)427-6899• Fax: (562)427-3314 Web Site:www.greggdrilling.com Email: info@greggdrilling.com Additional locations in: Houston• Palo Alto• San Francisco