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PUBLI1 HEALTH SEA"VICES SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 209/468-3420 MEMORANDUM TO: Interested Parties FROM: Mary Meays, Senior REHS DATE: December 16, 1994 RE: Country Club Shell located at 2575 County Club Blvd, Stockton History On December 7, 1994, San Joaquin County, Public Health Services Environmental Health Division (PHS/EHD) was notified that gasoline was released from underground storage tanks on site. The tanks in question no longer contain gasoline products. It was estimated that approximately 8,500 gallons of gasoline was discharged into the environment. On December 10, 1994, Shell's consultant, Fugro, was on site to install a recovery well. Gasoline recovery was initiated and approximately 400 gallons of water and product was removed and transported off site. On December 11, 1994 and December 12, 1994, gasoline recovery continued and approximately 350 gallons (150 on 12/11 and 200 on 12/12) of water and product was removed and transported offsite. On December 13, 1994, an additional recovery well was installed and vapor extraction was initiated. It is estimated that by using the two wells, approximately 50 gallons of product are recovered daily. The recovery of vapors occurs when a vacuum is placed on the recovery wells. The vapors are then destroyed by an engine which burns the vapors. The destruction efficiency has been estimated by Fugro to be 99.99 % based on initial air sampling. Air samples have been collected daily since the vapor extraction system was started -up. The vapor extraction treatment unit is located within a fenced area. PHS/EHD has been informed that at least daily Fugro has sent a staff person to the site to monitor the system. Future plans Fugro is in the process of extending the permit from the San Joaquin Valley Unified Air Pollution Control District to operate the vapor extraction system. The current permit is expected to expire on December 18, 1994. PHS/EHD has requested that additional vapor extraction wells be installed to enhance the rate of gasoline recovery. The target date is January 14, 1995 for Shell Oil to submit a plan to remove and replace the underground storage tanks. The target date is February 1, 1995 for tank removal and replacement. Every effort will be made to minimize the impacts associated with these activities. If you have any questions, please contact Mary Meays with PHS/EHD at (209) 468-0337. A Division of San Joaquin County Health Care Services