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PUBLICHEALTH SERVYCES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer , a� <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 trFoa <br /> (209) 468-3420 <br /> STEPHEN POA <br /> copy <br /> MOBIL OIL CORPORATION <br /> 3800 W ALAMEDA AVE STE 2000 APR 12 1994 <br /> BURBANK CA 91505-4331 <br /> RE: Former Mobil Bulk Plant SITE CODE: 1968 <br /> 500 East Grant Line Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> review of the "Supplementary Site Assessment Work Plan" dated March 28, 1994 and prepared by Alton <br /> Geoscience. PHS/EHD has the following comments for your consideration. <br /> The work plan included the drilling and sampling of 11 soil borings, 9 of which will be placed on site and <br /> 2 off site. These soil borings were placed to characterize the residual soil contamination which may <br /> remain after the 1990 excavation. <br /> Soil samples will be collected for geological description and field screening every 2.5 feet below the <br /> backfilled area and every 5 feet outside the backfilled area to be followed with every 2.5 feet below 10 feet. <br /> Selected soil samples will undergo laboratory analysis. PHS/EHD suggests that adequate soil samples <br /> undergo analysis to characterize any residual soil contamination encountered and to confirm that the <br /> excavation successfully removed the contaminated soil. <br /> Additional investigation and/or remediation may be required once PHS/EHD has evaluated the results of <br /> this investigation. <br /> Please submit two permit applications for the proposed soil borings and $89 for each permit application to <br /> PHS/EHD. A City of Tracy and/or Pacific Gas and Electric encroachment permit will be necessary for the <br /> proposed soil boring west of the site. Field work may commence upon issuance of drilling permits. If you <br /> have any questions, please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Ways, Senior REHS 4Dianeinison, REHS <br /> Site Mitigation Unit Supervisor <br /> DH/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB c: Gordon Egan, Tracy Venture <br /> c: Greg Schubert, Tracy Venture/Mark III c: Ronald Scheele, Alton Geoscience <br /> A Division of San Joaquin County Health Care Services <br />