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SECOR c t, r <br /> NTE RNATI O NAJ 3475 west Shaw Ave Suite 104 <br /> .4 I k'COR 3OE7; 1-3 Fresno CA 93711 <br /> 559-271-2650 TEL <br /> 559-271-5108 KAx <br /> May 6, 2005 MDFE C E - <br /> MAY 1 0 2005 <br /> Ms Victoria McCartney EAT <br /> San Joaquin County Environmental Health Division E{ O�dP��Pr;IVENY NT HEALTH <br /> 304 East Weber Avenue, Third Floor <br /> ICES <br /> Stockton, California 95202 <br /> RE First Quarter 2005 Groundwater Monitoring Report <br /> Former Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> SECOR Protect No 77CH 00000 23 0003 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR), on behalf of ChevronTexaco Environmental <br /> Management Company (EMC), has provided this report to summarize the first quarter 2005 <br /> (1 Q2005) groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - FIRST QUARTER 2005 <br /> ■ Conducted quarterly groundwater monitoring and sampling, <br /> ■ Prepared and submitted quarterly groundwater monitoring report, and, <br /> ■ Prepared and submitted assessment work plan <br /> PLANNED ACTIVITIES - SECOND QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On February 11, 2005, Gettler-Ryan Incorporated (G-R) performed 102005 groundwater monitoring <br /> and sampling G-R's groundwater monitoring report is included in Attachment 1 Depth to <br /> groundwater across the site ranged from 23 89 to 25 43 feet below ground surface (bgs) <br /> Groundwater elevation across the site decreased an average of 1 40 feet from the previous sampling <br /> event Groundwater flow was calculated to the southeast at an approximate gradient of 0 001 to <br /> 0 009 feet per foot A summary of total petroleum hydrocarbons as gasoline (TPHg), diesel (TPHd), <br /> and motor oil (TPHmo), benzene, and methyl tertiary butyl ether (MtBE) laboratory analytical data <br /> are listed below <br /> 102005 QMR 90557 doc SECOR International Incorporated <br />