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groundwater, or mechanical refusal, whichever is greater. Groundwater is expected at <br />approximately 46 feet below ground surface (bgs). <br />If LNAPL is observed, discrete soil samples will be retained just above a zone of visible <br />hydrocarbon impact (based on LIF#4, impact is expected at KB-03 at 35 feet bgs), within the <br />zone of hydrocarbon impact, just above first-encountered groundwater, and a bottom sample <br />with no visible hydrocarbon impact. If LNAPL is not observed, one discrete soil sample will be <br />collected just above first-encountered groundwater. Samples will be retained at no less than <br />5-foot intervals, with the samples described above submitted for analysis and the remaining <br />placed on hold at the laboratory. One groundwater sample will be collected from the first- <br />encountered groundwater-bearing zone in each boring. <br />Additional Soil and Groundwater Sampling Work Plan, <br />BNSF Mormon Yard, Stockton CA <br />Page 4 <br />Ilfwybnsf2\bnsfwpIwp1201811899020.00_mormon_yannwork_planin2018 mormon yard sampling wp_mwm.doc