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PUBLIC HEALTH SER'"'NCICES <br /> .G <br /> " SAN JOAQUI1v COUNTY <br /> JOGI KHANNA 11.D.,\AP.H. <br /> Health Officer �P <br /> P.O. Box 2009 1601 East Hazelton Avenue) <br /> • Stockton, California 95201 a "' <br /> (209) 468-3400 <br /> STEPHEN POA <br /> MOBIL OIL CORPORATION �� j <br /> 3800 WEST ALAMEDA AVE :/ <br /> SUITE 2000 Cccc, JJ L 0 7 1992 <br /> BURBANK CA 915054331 <br /> Re: Former Mobil Bulk Plant SITE CODE: 1.968 <br /> 500 East Grant Line Road <br /> Tracy CA 95376 <br /> Thank you for your recent submittal entitled "Supplemental Site Investigation* dated May 19, 1992 and <br /> prepared by Alton Geoscience. San Joaquin County Public Health Services,Environmental Health <br /> Division (PHS/EHD) has completed review of this report and has the following comments for your <br /> consideration. <br /> During this phase of the investigation soil contamination was encountered during the drilling of the on-site <br /> monitoringlextraction well,AW-9. Soil contamination was not encountered during the drilling of off-site <br /> soil borings, B-11, B-12, B-13, B-14, and B-15. Groundwater contamination beneath the site is <br /> documented as evidenced by analytical results from monitoring wells AW-3 and AW-9. Off-site <br /> groundwater contamination was not indicated during recent sampling,February 21, 1992, April 7, 1992 and <br /> April 24, 1992. <br /> While the "Supplemental Site Investigation" report described the recent investigation and included <br /> conclusions summarizing analytical results, it failed to include recommendations. Recommendations are <br /> recognized as an essential component of reports and are used to further evaluate the site. As submitted <br /> the "Supplemental Site Investigation" is incomplete. Please submit recommendations as an addendum to <br /> this report by August 13, 1992. <br /> Periodic extractions of contaminated groundwater from monitoring wells,AW-3 and AW-9, began March <br /> 26, 1992 and continue on a regular basis. The site has been posted to indicate the use of this remedial <br /> action. Please include disposal records and volumes extracted with quarterly reports. <br /> I€you have any comments, questions, or to schedule a site inspection, please contact Mary Meat's, RENS, <br /> of my staff at (249) 468-0337. <br /> Jogi Khanna„Mb., M.P.H. <br /> Health Obi <br /> /Laurie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB c: Jeff Scharff, Dufour, Greben and Scharff <br /> c: Greg Schubert,Tracy Venture/Mark III c: Stephan Rosen, Alton Geoscience <br /> A Division of San Joaquin county Hoch care semces �� <br />