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iQ �1 <br /> ' Unocal Corporation <br /> ' 2000 Crow Canyon Place Suite 400 C`a f, <br /> i San Ramon,California 94583 <br /> Telephone(510)867-0760 £ r!r �r;"�, <br /> Facsimile(510)277-2309 <br /> J� 'r,Tr;�r- f�1 <br /> UNOCAL 76 <br /> January 20, 1995 <br /> Norlh Region <br /> Corporate Environmental Remediation&Technology Mr Harlin Knoll, Senior REHS <br /> Site Mitigation Unit <br /> Environmental Health Division <br /> San Joaquin County <br /> P O Box 388 <br /> Stockton, CA 95201-0388 <br /> Unocal Service Station #6015 <br /> 601 E Kettleman Lane <br /> Lodi, CA <br /> Dear Harlin <br /> Please find attached for your reference the most recent monitoring data for the Lodi Site You <br /> will notice there are reported values for both xylene and toluene greater than the detection <br /> limits of the analysis of the groundwater Also attached is a copy of a letter from Sequoia <br /> Analytical which indicates they are aware of this anomaly and are currently evaluating it It as <br /> important to note they do not believe the reported discrete peaks are andacatwe of hydrocarbon <br /> contamination Prior to this QM period, there have never been xylene and toluene values for <br /> most of the wells at this site At the end of the Quarterly Monitoring Report are also the <br /> results of the analysis of two field blanks (distilled water) which also show the same anomalous <br /> results <br /> Unocal has formally requested closure at this site on October 7, 1992 and November 23, 1993 <br /> The San Joaquin County Environmental Health Department (SJCEHD) has requested <br /> additional work on this site following our requests for closure Al requests for data have been <br /> complied with and additional work has been completed and submitted <br /> Unocal conducted tank replacement activities at this site during March, 1991 and has conducted <br /> groundwater monitoring since December, 1991 With the exception of one very low benzene <br /> concentration (0 77 ppb, which is below the MCL) in one well during September, 1993, no <br /> gasoline has been detected in the groundwater since March, 1993 <br /> Unocal no longer owns this property and is currently spending approximately $ 15,000/ year on <br /> this site in additional to increased liability resulting from continued operation of a non-Unocal <br /> service station at the site <br />