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SECOR www secor com <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED 916ncho 861 Cordo <br /> va ECA 95670 <br /> TL <br /> 17 916 861-0430 rnx <br /> E <br /> ��I� <br /> January 21, 2003 JAN 2 3 2003 '' <br /> ENVIRONMENT HEALTH i <br /> PERMIT/SERVICES <br /> Margaret Lagono <br /> San Joaquin County <br /> Environmental Health Department w <br /> 304 East Weber Avenue, Third Floor , <br /> Stockton, CA 95202 , <br /> RE Chevron Groundwater Monitoring Report (4Q2002) <br /> a <br /> Chevron Station 9-2033 <br /> 508 West Charter Way <br /> Stockton, California <br /> SECOR Project No 77CH 00000 00 0007 F <br /> Dear Ms Lagono ' <br /> SECOR international Incorporated is providing this report to summarize the recently <br /> completed groundwater-monitoring event at the above referenced site The site is located at 508 <br /> West Charter Way, Stockton, California <br /> ,t <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 /> eq <br /> DISCUSSION <br /> t <br /> This groundwater monitoring and sampling event was performed by Gettler-Ryan Inc on November <br /> 13, 2002 Groundwater monitoring and sampling data was collected from wells MW-1, MW-2, and <br /> MW-3 Each groundwater sample was analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHg) by EPA Method 8015, and benzene, toluene, ethyl benzene and xylenes (BTEX), and methyl <br /> tertiary butyl ether (MtBE) by EPA Method 8260b, Groundwater m ,� <br /> samples collected from monitoring well MW-1 were also analyzed for total petroleum hydrocarbons <br /> as diesel (TPHg) �eai�}e-lialoearbons-by-E--PA semi-volatile organics by EPA �+ y�'*►►►f�''°° <br /> Method 8270,lot�a recoverable petroleum hydrocarbons (TRPH) by EPA Method 418 1, and <br /> • dissolved metals including cadmium, chromium, nickel, lead and zinc by EPA Method 6010B �ti:` AW, <br /> Results of the sample collected from MW-1 reported TPHd at a concentration of 350 micrVal <br /> per <br /> liter (µg/i), TPHg at a concentration of 140 µg/l , MtBE at a concentration of 830 µg/l, and and 3 <br /> gas (TOG) at a concentration of 590 µg/I- No other target analytes in MW-1 were detected No d? ��`'°� U <br /> target analytes were detected In samples from MW-2 "Laboratory results for the sample collected q,15� <br /> from MW-3 detected TPHg at a concentration of 5,600 4g/l,-and benzene at a concentration of 370{,*�ib✓� <br /> µg/I Groundwater elevations generally decreased across the site by approximately 0 81 feet whenk c�� � <br /> � l <br /> . compared with the previous monitoring event Groundwater flow was to the northeast at 0 006 ft/ft � T CJ <br /> um <br /> 11Chevron4 OXIPenodfc Monrtonng120021402002 QMR doc SECOR Intemational Incorporated <br />