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Pre-field Activities • A pre-work site meeting was conducted on August 12, 2013, during which Terry Fox with Caltrans and Josh Ewert with Geocon reviewed the project site and scope. The proposed UST excavation area was marked out with white paint for subsequent utility clearance by responding Underground Service Alert(USA)members. • Contacted USA (Ticket No. 449615) a minimum of 48 hours prior to performing the field activities. • Obtained a soil boring permit from the SJCEHD.A copy of the permit is attached. • Prepared a Health and Safety Plan dated October 2013 to provide guidelines on the use of personal protective equipment and the health and safety procedures implemented during the field activities. • Prepared a Workplan dated October 8, 2013, to describe the requested scope of services and to outline procedures and methods to complete the field sampling and analytical testing activities. • Retained the services of Advanced Geological Services (AGS) to perform a geophysical and utility survey. • Retained the services of Advanced Technology Laboratories (ATL), a Caltrans-approved and California-certified analytical laboratory located in Signal Hill, California, to perform the chemical analysis of soil samples. • Caltrans provided notification to the adjacent private property owner in advance of the field activities. Field Activities Geophysical Survey On September 6, 2013, AGS performed a geophysical and utility survey at the Site. AGS identified shallow metal at the UST location at Excavation 1 in addition to a buried metal anomaly and various utilities. The findings of the AGS survey are depicted on Figure 2. A copy of AGS's geophysical survey report is attached. Soil Sampling We performed two soil borings at the Site on November 18, 2013 using Geocon's direct-push rig. Borings B 1 and B2 were performed on either side of the tank to a maximum depth of 16 feet. Each boring was initially advanced using a hand-auger to a depth of 5 feet to confirm clearance of buried utilities and the tank. The approximate boring locations are depicted on Figure 2 and shown on Photo No. 5. Continuous core soil samples were collected in 4-foot-long cellulose thermoplastic (acetate) liners driven by the direct-push rig at depths between 5 and 16 feet. The acetate liners were cut to obtain soil samples at 5-, 10- and 15-foot depth intervals. The liners were capped with Teflon® sheets and polyethylene end caps. Each sample container was then labeled and placed in a cooler pending delivery to ATL for chemical analyses under chain-of-custody(COC)protocol. Linden UST Site investigation,TO No.4 Caltrans Contract 06A1895,EA No. 10-OY3600 Geocon Project No.89800-01-04 -2- December 11,2013