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GETTLER - RYAN INC. <br /> March 26, 1999 <br /> G-R Job #180179 <br /> Mr Edward C Ralston <br /> Tosco Marketing Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE First Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station #5417 <br /> 1700 East Yosemite Avenue <br /> (State Highway 120) <br /> Manteca, California <br /> Dear Mr Ralston, <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On February 22, 1999, field personnel monitored and sampled three wells (MW-1, MW-2 and <br /> MW-3) at the above referenced site <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase <br /> hydrocarbons Separate-phase hydrocarbons were not present in the wells Static water level data and <br /> groundwater elevations are summarized in Table 1 A Potentiometnc Map is included as Figure I <br /> Groundwater samples were collected from the monitoring wells as specified by G-R Standard Operating <br /> Procedure - Groundwater Sampling (attached) The field data sheets are also attached The samples were <br /> analyzed by Sequoia Analytical Analytical results are summarized in Tables 1 and 2 A Concentration Map <br /> is included as Figure 2 The chain of custody document and laboratory analytical reports are also attached <br /> S erely, <br /> � S.�EAED GE0" <br /> VeanPLHarding �,� �,EN J Cq 0�'�, <br /> Protect Coordinator -1) CO 9% <br /> /J � No 5577 <br /> Stephen J Carter <br /> Senior Geologist, R G No 5577 ��9 <br /> rFoF cAt�F°� <br /> Figure 1 Potentiometric Map <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br />. Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 5417 qml <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 551 - 7555 <br />