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603284-001 <br />conditions were characterized to develop recommendations for foundations, <br />paving, and earthwork. <br />The tasks completed as part of this study are described below in more detail. <br />Task 1 - Document Review <br />As part of our study, we reviewed readily available geotechnical documents and <br />maps that are pertinent to the subject site. The documents reviewed are <br />referenced in Appendix A. <br />Task 2 - Subsurface Exploration <br />Our field exploration was performed on September 30 and October 3, 2011 and <br />consisted of nine hollow-stem auger borings (designated B-1 through B-9 ) drilled <br />to a maximum depth of 51% feet below existing ground surface (bgs) and six <br />Cone Penetration Test (CPT) soundings (designated CPT-1 through CPT-6) <br />advanced to depths ranging from 75 to 100 feet bgs. The CPT soundings were <br />performed to aid in the characterization of subsurface materials and to measure <br />shear wave velocities. The approximate locations of the explorations are shown <br />on Figure 2, Boring and Cross Section Location Map. <br />The borings were logged by a certified engineering geologist from our staff. The <br />earth materials encountered were visually classified in accordance with the <br />Unified Soil Classification System (USCS). Geologic contacts and stratigraphic <br />boundaries, where encountered, are indicated on the logs. The logs of the <br />borings and CPT soundings are presented in Appendix B. <br />Prior to conducting the subsurface explorations, a reconnaissance of the site was <br />carried out by Leighton Consulting, Inc. (Leighton) personnel. The locations of <br />proposed explorations were marked on the ground surface and Underground <br />Service Alert (USA) contacted to provide clearance for any underground utility <br />lines. Leighton encountered no underground utilities during the explorations. <br />Leighton personnel obtained relatively undisturbed ring samples and Standard <br />Penetration Test (SPT) samples for geotechnical laboratory observation and <br />testing. The samples were obtained at the depths indicated on the boring logs. <br />The relatively undisturbed ring samples were obtained by driving a Modified <br />California Split-Spoon Sampler (ModCal) into the bottom of the boring as it was <br />-2- <br />Leighton