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E C 0 R <br /> 3017 Kilgore Road Suite 100 <br /> } Rancho Cordova CA 95670 <br /> C l 916 861-0400 TEL <br /> 916 861 0430 FAX <br /> • �� }Illi <br /> January 8, 2003 ,]AN 4 9 203 <br /> E.[�1V1 RM�M sPR�C�� <br /> P� <br /> Jeffrey Wong <br /> San Joaquin County <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> RE Chevron Groundwater Monitoring Report (402002) <br /> Chevron Station 9-9840 <br /> 4344 Waterloo Road <br /> Stockton, California <br /> SECOR Project No 77CH 00000 00 0023 <br /> Dear Mr Wong <br /> SECOR International Incorporated is providing this report to summarize the recently completed <br /> groundwater-monitoring event at the above referenced site The site is located at 4344 Waterloo <br /> Road, Stockton, California <br /> ACTIVITIES COMPLETED FOURTH QUARTER 2002 <br /> • Conducted quarterly groundwater monitoring and sampling Prepared and submitted quarterly <br /> groundwater monitoring report <br /> PROPOSED ACTIVITIES FOR FIRST QUARTER 2003 <br /> Conduct quarterly groundwater monitoring and sampling Prepare and submit quarterly groundwater <br /> monitoring report <br /> DISCUSSION <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on October 4, <br /> 2002 Seven monitoring wells were sampled during this event TPHg and Benzene were not <br /> detected in any of the samples collected MtBE was detected in four of the wells sampled at <br /> concentrations ranging from 5 micrograms per liter (4g/1) in the sample collected from MW-4 to 110 <br /> pg/I in the sample collected from MW-2 Groundwater elevations across the site decreased an <br /> average of approximately 4 63 feet this quarter Groundwater flow was to the north at 0 002 ft/ft, <br /> consistent with historical data <br /> LIMITATIONS <br /> The findings presented in this letter are based on data and interpretations provided by Gettler-Ryan, <br /> Inc Gettler-Ryan's report is attached The data presented in this summary is accurate only to the <br /> degree implied by the sources and methods used No warranty, expressed or implied, is made by <br /> SECOR <br /> IChevron1998401Periodic Mon itormg120021402002 doc <br />