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Ib <br /> S.J.C. Dept. of General Services f <br /> May 31, 1989 <br /> Page 2 <br /> i; <br /> 8. The workplan should address the contaminated soil remaining in the tank pit. <br /> The soil may be a continuing source of further contamination. <br /> 9. As the depth of original soil samples obtained were between 15 and 20 feet, the , <br /> recommended soil borings shall be advanced to a minimum depth of 40 feet or <br /> until ground water is encountered. <br /> 10. Describe the extraction tube illustrated on Detaill 2 of the above referenced <br /> workplan. <br /> Due to the proximity of ground water, a ground water investigation may be necessary <br /> regardless of the outcome of this soil evaluation. Tri-Riegional Guidelines for Initial <br /> Evaluation and Investigation of Underground Storage Tanks shall be followed, as well <br /> as guidance presented in the LUFT Manual. <br /> Please contact Diane Hinson of my staff at (209) 468-31,'420, if you have any questions. <br /> Jogi Khanna, M.D., M.P.H. <br /> District Health Officer j <br /> 'P <br /> /otil <br /> 114 __ <br /> `- Ron�Va :TI.S., Director <br /> Environmental Health Division i <br /> RV/CW:ma <br /> II: <br /> cc RWQCB, Region 5;— =; l <br /> Kleinfelder, Inc.; Mark Urquhart <br /> t <br /> i <br />