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i <br /> ;F <br /> 5157 W. Business Loop, Tracy <br /> Page 2 <br /> i� <br /> 2) Place one soil boring in the center of the former UST 2'; 4, and 5 cluster to <br /> define the vertical extent of the contamination. Continuous core sampling <br /> should be used. The boring should continue until at least two consecutive 5- <br /> foot intervals of clean soil is observed. This bore hole would replace the <br /> monitoring well through the former UST location Proposed in the work plan. <br /> Monitoring wells should be placed outside the former UST location in case <br /> excavation of the area is proposed in the future. <br /> �M <br /> 3) Relocate the southem-most monitoring well closer toward the former <br /> dispenser island and UST 2,4, and 5 excavation.�r <br /> ,i <br /> it a <br /> 4) Advance soil borings near or in the middle of the former UST 6 excavation, <br /> with the option of converting at least one soil boring downgradient of the <br /> contamination to a monitoring well based on field obs66ations. <br /> �i• <br /> 5) Additional soil borings or monitoring wells may be warranted based on field <br /> 1 <br /> observations and field organic vapor detection data. <br /> 6) In addition to water samples, analyze the soil samples.for all oxygenate <br /> compounds as methanol ethanol tertiary butyl alcohol methyl tertiary butyl <br /> ether (MTBE), di-isopropyl ether, ethyl tertiary butyl ether, and tertiary amyl <br /> methyl ether using EPA Method 8260. IE <br /> 7) Selection of samples for analyses must include PHS/EHD comment and <br /> agreement. <br /> Please submit a work plan addendum to PHSIEHD for approval after reviewing <br /> these comments. 3r <br /> If you have any questions, feel free to contact Jeff Wong at (209) 468-0335. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Jeffrey Wong , EHS, Trainee Margaret agorio, REHS <br /> LOP/Site Mitigation Unit IV r Supervisor <br /> JW:Ib <br /> c: Advanced GeoEnvironmentai Inc. - William Little <br /> c: RWQCB, Central Valley Region - Pat Anderson <br /> �M <br /> E ,i <br />