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°rt SECORmftgore�icoad Suite 100 INTERNATIONAL S E C ® Rancho Cordova 96670 INCORPORATED 916 861 0400 TEL 916 861 0430 Fax • February 26, 2003 �}�f] nECE �1 ED Mike Infurna MAR 14 2003 San Joaquin County Environmental Health Division ENVIRONMENT HEALTH 304 East Weber Avenue, Third Floor PERMIT/SERVICES Stockton, CA 95202 RE Chevron Groundwater Monitoring Report (402002) Chevron Station 9-1848 1257 Yosemite Avenue Manteca, California SECOR Project No 77CH 00000 00 0006 Dear Mr Infurna SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Company, is providing this report to summarize the recently completed groundwater-monitoring event at the above referenced site The site is located at 1257 Yosemite Avenue, Manteca, California ACTIVITIES COMPLETED FOURTH QUARTER 2002 Conducted quarterly groundwater monitoring and sampling Prepared and submitted quarterly groundwater monitoring report PROPOSED ACTIVITIES FOR FIRST QUARTER 2003 Conduct quarterly groundwater monitoring and sampling Prepare and submit quarterly groundwater monitoring report DISCUSSION This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on October 18, 2002 Three wells were sampled during this event MtBE concentrations were reported in the sample collected from well C-2 at 98 micrograms per liter (µg/1) Groundwater elevations across the site decreased an average of approximately 0 72 feet this quarter Groundwater flaw was calculated to be to the northeast at approximately 0 005 ft/ft, consistent with historical data LIMITATIONS The findings presented In this letter are based on data and interpretations provided by Gettler-Ryan, Inc Gettler-Ryan's report is attached The data presented in this summary Is accurate only to the degree Implied by the sources and methods used No warranty, expressed or Implied, is made by SECOR I IChevron1918481Penodic Mon itoring120021402002 doe