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Kennedy/Jenks Consultants Section 3: Site Description and History The Site is the BNSF Mormon Yard, with the address of 801 Diamond Street, Stockton, California. The Mormon Yard is an active railyard with railroad switching, railcar and locomotive maintenance, etc. In October 2011, a diesel locomotive spilled approximately 1,400 gallons of diesel at the Site on a track between the maintenance building and Diamond Street (Figure 1). A BNSF contractor responded to the spill. The spill response involved plugging the leak, removing the track panel, excavating the impacted soil, taking confirmation samples, backfilling, and repositioning the track. After the track had been repositioned, the results of the confirmation samples were received. The maximum detected concentration of total petroleum hydrocarbons as diesel (TPHd) in the confirmation samples was 9,000 milligrams per kilogram (mg/kg). The San Joaquin County Environmental Health Department (SJCEHD) contacted BNSF in May 2013 regarding the confirmation sample results. SJCEHD requested the Central Valley Regional Water Quality Control Board (RWQCB) provide oversight for the soil investigation. A Soil Sampling Work Plan (including this Health and Safety Plan ) was prepared and implemented by Kennedy/Jenks Consultants in 2015. The investigation consisted of two soil borings drilled in the vicinity of the former locomotive spill in 2015. Groundwater samples from these two borings contained TPHd concentrations in excess of applicable screening levels. Subsequent research discovered likely onsite sources of TPHd consisting of underground storage tanks (USTs) and piping; upgradient sources did not appear likely. Documents recorded that TPHd had been detected in soil and the USTs had been over-excavated to remove the impacted soil. For 2016, high resolution site characterization (HRSC) procedures are planned to evaluate the extent of TPHd in groundwater. This entails using direct-push drilling equipment to advance tooling into the subsurface, which will produce a depth-specific reading of conditions that are intended to characterize the potential extent of hydrocarbons in the subsurface. The drilling will be done with a GeoProbe-type hydraulic push/drive drill rig. The HRSC tooling analyzes and records conditions in the soil, and does produce any soil or groundwater samples or cuttings. Fifteen HRSC borings are proposed along four transects at the Site. The transects are located around the former USTs. Three transects are located inside of the rail yard between railroad tracks; one transect with two borings is located along East Worth Street. The soil borings will be advanced approximately 50 feet below ground surface (bgs), which is estimated to be about five feet groundwater. BNSF Mormon Yard — Soil Sampling Site-Specific Health and Safety Plan Mormon Yard, Stockton, California © 2016 Kennedy/Jenks Consultants Page 6 Ilsfocadtprojectslis-proj1201311365020 Ol_bnsf stockton work plan12016 hrsc work plan1appendiceslappendixb_hasp12016_hasp_2015content_final docx