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U-Neul#709-50 Blaes Environmental Preliminary Site Conceptual Model December 15,2006 is 3 0 ADDITIONAL SOIL ASSESSMENT ACTIVITIES—MARCH 2006 The following sections present the procedures and results of additional soil assessment activities conducted in March 2006 to fully assess the extent of hydrocarbons in saturated soil associated with the U-Haul site The scope of work included drilling two cone penetrometer test (CPT) soil borings (DP-7 and DP-8), analyzing select soil samples collected from the CPT borings, and reporting the results of the additional site assessment activities in a Site Conceptual Model for the U-Haul site 3 1 UNDERGROUND UTILITYICONDUIT SURVEY BIaes Environmental researched the locations of all underground utilities on-site and adjacent to the site to verify that an underground utility in the area of the hydrocarbon release had not provided a preferential migration pathway that affected the otherwise expected distribution/migration of the hydrocarbons The locations of the sanitary sewer, storm drains, natural gas, electric, and water are shown on Figure 4 Based on the location of the most significant portion of the petroleum hydrocarbon release (western dispenser island), and the observed petroleum hydrocarbon concentrations in soil and groundwater during site assessment activities, it does not appear that any underground utilities have resulted in a preferential migration pathway for petroleum hydrocarbons at the site 3 2 DRILLING ACTIVITIES 32.1 Pro ect Coordination Prior to performing on-site drilling activities, Blaes Environmental obtained the appropriate soil boring permits from the SJC EHD and obtained an off-site access agreement from the Stockton Unified School District (SUSD) The approved permits and access agreement are included in Appendix E and Appendix F, respectively In addition, Underground Service Alert (USA) was notified the week before field activities commenced in order to locate existing underground utilities at each proposed borehole location A pnvate utility locating company (Spectrum Geophysics) from San Fernando, California was also subcontracted to mark all private utilities on-site in preparation for drilling activities 322 Health and Safety Meeting Blaes Environmental conducted a health and safety meeting at the site prior to initiating field activities Attendees at the meeting included BIaes Environmental personnel and the three members of the dnllmg crew Page 8