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8203 Eleventh St, Tracy <br /> Page 2 <br /> In April 1995, UNOCAL proposed to install air sparge/vapor extraction wells <br /> which EHD approved. In January 1996 UNOCAL stated that based on State <br /> Water Resources Control Board interim guidance that passive bioremediation <br /> with groundwater monitoring and off site lateral assessment to delineate the <br /> hydrocarbons in groundwater were recommended for the site. <br /> During 1996 there were staff changes at EHD and oversight of this site stopped. <br /> It is documented in EHD files that in July 1998, EHD staff discussed this site with <br /> Gail Wigget formerly with the SLIC unit of your agency. She requested that since <br /> it appeared that the contamination of greatest concern at this site is from the <br /> AST, concurrence from the SLIC unit of your agency should be obtained prior to <br /> closure of this site. <br /> At this time EHD is transferring oversight of this site to your agency. Enclosed is <br /> some information about the site. Many of the site reports were also sent to your <br /> agency. If you need further information let me know. If you have any questions <br /> contact me at (209) 468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> Enc. <br /> c: Dan Truzzolino, Tosco Refining Company, 9645 Santa Fe Springs Road, <br /> Santa Fe Springs, CA 90670 <br /> Deanna Harding, Gettler-Ryan, 67r7 Sierra Court, Suite J, Dublin CA <br /> 94568 <br />