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Limited Site Investigation Irerracon Proposed Love's Travel Stop . Lodi, California April 15, 2011 ■Terracon Project No. 60117009 2.0 FIELD ACTIVITIES Terracon's field activities were conducted on March 31, 2011 by a Terracon environmental professional with the oversight of a California Registered Professional Geologist from Terracon. A site-specific health and safety plan was followed by Terracon during field activities for all phases of the investigation. 2.1 Pre-Mobilization Prior to drilling activities, the boring locations were marked by Terracon personnel for clearance of underground utilities by Underground Service Alert (USA North, Dig Alert Ticket No: 083253). A permit to obtain groundwater samples was obtained from San Joaquin County, Environmental Health Department. A copy of the permit is included in Appendix E. 2.2 Borings and Monitoring Wells As part of the approved scope of work, three borings: B-1 OA, B-1 1A, and B-12A, were advanced using a direct push drill (DPT) rig to a target depth ranging from 12 to 14 feet below grade surface (bgs). The borings were advanced in the immediate vicinity of the geotechnical borings B-10, B-11, and B-12, which were formerly advanced along the western boundary of the site in the proposed UST system. The approximate boring locations are presented on Figure 2, in Appendix A. Drilling services were performed by Technicon, a State-of-California C-57 licensed driller using a truck-mounted DPT drill rig under the supervision of a Terracon environmental professional. Soil samples were collected using four-foot acetate sleeves. Prior to utilizing the DPT drill rig, each of the borings were hand augured to a depth of approximately 5 feet bgs to evaluate the presence of any underground utilities. Drilling equipment was cleaned using a high pressure washer prior to beginning the project and before beginning each soil boring. Sampling equipment was cleaned using an Alconox° wash and potable water prior to the beginning of the project and before collecting each soil sample. Soil samples were collected continuously and observed to document soil lithology, color, moisture content, and sensory evidence of impairment. The soil samples were field-screened using a photoionization detector(PID) to indicate the presence of total organic vapors (TOVs). The general soil lithology observed during sample collection was primarily silty sands to target depths of the borings, except for soil boring B-10, where a poorly graded sand was observed between approximately 10 to 11 feet bgs. Detailed lithologic descriptions are presented on the soil boring logs included in Appendix B. Reliable ■ Responsive ■ Convenient■ Innovative 3