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ExxonMobil <br /> Refining &Supply Company Jennlfe .Sed1aCFlek <br /> Global Remediation Project Manager <br /> 4096 Piedmont Avenue#194 .r ; .t a, !f;i. HEALTH <br /> Oakland,CA 94611 <br /> J�VjrF <br /> 510.547.8196 <br /> 7.8706 l ie 04 MAY 17 PM 2s 05 <br /> AX <br /> jenn'rfeennfferc.sedlachek�e�ownnmtH1 <br /> o .00m <br /> May 7,2004 E on Mob1I <br /> Mr.Michael J.Infurna <br /> Refining & Supply <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 <br /> Subject: Former Exxon RAS#7-3708,2705 Country Club Boulevard,Stockton,California <br /> Dear Mr.Infurna: <br /> Attached for your review and comment is a copy of the Report of Groundwater Monitoring,First Quaver 2004 <br /> for the above-referenced site. The report, prepared by ETIC Engineering, Inc. of Pleasant Hill, California, <br /> details the results of the March 2004 sampling event. <br /> The former ExxonMobil site is located immediately east of active 7-Eleven facility No. 14117. ExxonMobil <br /> well MW7 is an upgradient well and is located approximately 60 feet from the neighboring 7-Eleven <br /> underground storage tanks. MTBE was fust detected in upgradient well MW7 in August 2000,almost 5 years <br /> after ExxonMobil sold the property. TBA was first detected in upgradient well MW7 in March 2002,6 years <br /> after ExxonMobil sold the property. Currently the TBA and MTBE concentrations in MW7 are 4,740µg/L and <br /> 5.40µg/L,respectively. The active 7-Eleven facility No. 14117 is the likely offsite source for these compounds. <br /> In addition to offsite sources potentially migrating onsite, recent increases in groundwater concentrations in <br /> ExxonMobil well VEW3 resulted in the San Joaquin County Environmental Health Department (SJCEHD) <br /> issuing Palisades Gas and Wash,Inc.,the current property owner,a Notice of Responsibility dated February 3, <br /> 2003. At ExxonMobil's request, Bingham MCCutchen, LLP of Los Angeles, California, commented on the <br /> petition filed on March 25,2003 by Palisades with the State Water Resources Control Board(SWRCB),which <br /> challenged SJCEHD's designation of Palisades as a responsible party for the above-referenced site. Currently, <br /> the SWRCB is reviewing the case history and comments from all parties to determine if Palisades is a <br /> responsible party. After completion of this review period,ExxonMobil intends to request to be removed as a <br /> responsible party for this site based on the current onsite and offsite unauthorized releases which are impacting <br /> the site. <br /> If you have any questions or comments,please contact me at 510.547.8196. <br /> Sincerely, <br /> Jennifer C.Sedlachek <br /> Project Manager <br /> Attachment: ETIC Groundwater Monitoring Report dated May 2004 <br /> c: w/attachment: <br /> Mr.James L.Barton-California Regional Water Quality Control Board,Central Valley Region <br /> Mr.Chuck Nichols-USA Petroleum Corporation <br /> c: w/o attachment: <br /> Mr.Jerry Mitchell-ETIC Engineering,Inc. <br />