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C1 <br />PUBLIC MEALTH SERVICES <br />SAN ,oAQUINCOUNTY <br />ENVIRONMENTAL HEALTH DIVISION <br />Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br />304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 <br />2091468-3420 <br />JOHN STROH MALED FEB 0 61996 <br />SAN JOAQUIN MOSQUITO ABATEMENT DISTRICT <br />7759 SOUTH AIRPORT WAY <br />STOCKTON CA 95206 <br />Re: San Joaquin Mosquito Abatement District Site Code: 1798 <br />7759 South Airport Way <br />Stockton CA 95206 <br />San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) has <br />completed review of the "1995 Fourth Quarter Groundwater Monitoring Report" dated <br />January 1996 and prepared by Weston. PHSIEHD has prepared the following comments for <br />your consideration. <br />The results of continued monitoring has indicated that the extent of groundwater <br />contamination is extremely limited and that the additional remediation is not warranted. Since <br />the underground storage tanks were removed in 1987, after the industry introduction of the <br />gasoline additive, methyl-tert-butyl ether (MTBE) it will be necessary to sample monitoring <br />well, MW1, for MTBE. PHSIEHD also suggests that you sample the facility well for MTBE. <br />Please submit a closure evaluation report including information requested in the "Appendix B: <br />Requests for Closure" dated March 1, 1994 and the attached "Case Closure Summary" to <br />hasten evaluation of your site for closure. Any residual soil contamination should be <br />estimated and the potential threat to groundwater evaluated. <br />A work plan to destroy the monitoring wells should also be included in the closure summary. <br />PHSIEHD looks forward to evaluating this site for closure certification. If you have any <br />questions or comments, please contact Mary Meays at (209) 468-0337. <br />Donna Heran, REHS, Director <br />Environmental Health Division <br />lnoa,4—�— <br />Mary Meays, Sen REHS <br />Site Mitigation Unit <br />MM17759AIR <br />enclosures <br />Diane M. Hinson, REHS <br />Supervisor <br />cc: Elizabeth Thayer, CVRWQCB (w/o enclosures) <br />Karla Brasaemle, Weston 2300 Clayton Road Concord CA 94520-2148 <br />A Division of San Joaquin County Health Care Services <br />