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Mr. Jeff Tierney September 2, 2020 OBJECTIVE Response objectives included recovering fresh diesel, stained soil, and ballast rock based on visual observations and managing the waste generated during the response. These objectives were accomplished by recovering the free product with a vacuum truck and absorbent pads and removing diesel impacted soil using an excavator and then collecting in-place soil samples for laboratory analysis. Further, the waste soil was profiled and transported to an off-site licensed landfill for disposal. SCOPE OF WORK CONDUCTED Soil excavation and sampling activities were conducted at the Site on July 22 and 23, 2020 to meet the response objectives as detailed below. The SJCEHD observed the response activities on July 23, 2020 and confirmed the cleanup met their expectations. A photograph log is provided as Attachment 1. Initial Response Activities On July 22, 2020, Ground Penetrating Radar Systems LLC, (GPRs) conducted a utility locate and found no utilities within the vicinity of the release area. Nearby municipal utilities were identified by USA Dig Alert and Arcadis documented the location of nearby sewer and storm drains. Diesel was not observed in nearby storm drains. Visually impacted ballast, soil, and diesel was removed by Patriot via vacuum truck from trenches between and perpendicular the rail ties and from potholes. An approximately 44 by 11-foot area of petroleum hydrocarbon staining was observed on the ground adjacent to the rail. Absorbent pads were placed in the trenches and potholes to remove diesel. Ballast and soil recovered via vacuum truck was stockpiled on plastic at a staging area south of Port Road A. Absorbent pads were placed in the trenches and potholes overnight to absorb residual diesel in concurrence with SJCEHD. Soil Excavation and Utility Inspection On July 23, 2020, CCT cut approximately 80 feet of track, which was removed by Dobbas. After the track was removed, Dobbas excavated an approximately 45 feet by 18 feet area to a maximum depth of approximately three feet below ground surface (bgs). A photoionized detector (PID) was used to screen the soil for volatile organic compounds (VOCs) to determine the final extent of the excavation area. Six in- place soil samples were collected from the floor and sidewalls of the excavation (Figure 2). Mr. John Alaniz, the SJCEHD representative, approved the excavation extent, stated no further action was required by the County relative to the excavation activities, and confirmed the excavation was approved for backfill. The excavation was backfilled with imported crushed rock subbase and new imported ballast from UPRR in Oroville, California. The track was replaced by Dobbas and reconnected by CCT. Waste Management Approximately 71 cubic yards of excavated material was loaded into five 20-yard roll-off bins and two 15- yard roll-off bins and stored at a staging area south of Port Road A. The track and absorbent pads were arcadis.com Page: 2020.09.02_Stktn_20.07.22_Loc Dsl Rls_Sum Rpt_Draft 2/5