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ExxonMobil <br /> Refining&Supply Company Jet nNeFrer C.Sediachek <br /> Global Remediation Project Manager <br /> 4096 Piedmont Avemae#194 <br /> Oaldand,CA 94611 <br /> 510.547.8196 <br /> 510.547.8706 FAX U U E V <br /> , jrxnnifer.c.sedlachek@e�oconmot>il.com v <br /> AUG 0 3 2004 E�onMobil <br /> July 23,2004 Refining & Supply <br /> ENVIRONMENT HEALTH <br /> Mr.Michael J hifuma PERMIT/SERVICES <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.Infiuna: <br /> Attached for your review and comment is a copy of the Report of Groundwater Monitoring, Second Quarter 2004 for the <br /> above-referenced site. The report,prepared by ETIC Engineering,Inc.of Pleasant Hill,California,details the results of the <br /> June 2004 sampling event. <br /> The former ExxonMobil site is located immediately east of active 7-Eleven facility No. 14117. ExxonMcbil well MW7 is <br /> an upgradier t well and is located approximately 60 feet from the neighboring 7-Eleven underground storage tanks. MTBE <br /> was first detached in upgradient well MW7 in August 2000,almost 5 years after ExxonMobil sold the property. TBA was <br /> first detected in upgradient well MW7 in March 2002,6 years after ExxonMobil sold the property. Currently the TBA and <br /> MTBE concentrations in MW7 are 5,630 gg/L and 3.90 pg/L,respectively. The active 7-Eleven facility No. 14117 is the <br /> likely offsite source for these compounds. <br /> In addition to offsite sources potentially migrating onsite,recent increases m groundwater concentrations in ExxonMobil <br /> well VEW3 resulted in the San Joaquin County Emimmnental Health Department(SJCEHD) issuing Palisades Gras and <br /> Wash, Inc., the current property owner, a Notice of Responsibility dated February 3, 2003. At ExxonMobil's request, <br /> Bingham McCutchen,LLP of Los Angeles,California, commented on the petition filed on March 25, 2003 by Palisades <br /> with the State Water Resources Control Board (SWRCB), which challenged SJCEHD's designation of Palisades as a <br /> responsible party for the above-referenced site. Currently,the SWRCB is reviewing the case history and comments from all <br /> parties to determine if Palisades is a responsible party. After completion of this review period, ExxonMobil intends to <br /> request to be removed as a responsible party for this site based on the current onsite and offsite unauthorized releases which <br /> are impacting the site. Currently,the TBA and MTBE concentrations in well VEW3,located near the existing USTs,are <br /> 114,000 pg/L and 330 gg/L,respectively. <br /> ff 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 July 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 />