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Unocal Corporation <br /> Diversified Business Groin <br /> 2121 North California Bouia srd.Suite 250 <br /> Walnut Creek,California 94596-7307 <br /> Telephone(925)944-3780 <br /> Facsimile(925)944-3781 <br /> . CE <br /> UNOCAL..76 S/tetmtq-t <br /> THE KIRK LAW FIRM <br /> May 18, 1999 <br /> Asset Mar�agemertt Group <br /> western a ^'amu Ms. Margaret Lagorio, Supervising REHS <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> Environmental Health'Division <br /> 304 East Weber Avenue, Third Floor . <br /> Stockton, CA 95202 <br /> Former Unocal Service Station#2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Ms. Lagorio: <br /> Thank you for your May 4, 1999 response to Unocal's submission of the Supplemental <br /> Site Characteri~ation Report prepared by ARCADIS Geraghty & Miller, dated February <br /> 26, 1999. We, of course, are disappointed that PHS/EHD continues to disagree with the <br /> conclusion that the site has been adequately characterized and is self-remediating through <br /> natural attenuation and intrinsic biodegradation. <br /> You are aware that Unocal has a petition for closure of this site pending before the State <br /> Water Resources Control Board(the "State Board") and that the staff has circulated a <br /> draft order closing the site. As we have stated a number of times, Unocal will abide by <br /> the State Board's decision whatever it is. If the State Board closes the site, no further <br /> action will be required and Unocal will concentrate its efforts on completing corrective <br /> action at its other former service station sites. If the site is not closed, Unocal will <br /> continue to perform whatever additional corrective action is appropriate for closure. <br /> We are. therefore. requesting the PHS/EHD extend the July.1, 1999 deadline for the <br /> submission of a workplan for additional work, as set forth in your May 4, 1999 letter, <br /> until after the State Board issues a decision on Unocal's position. <br /> EXHIBIT 15 <br />