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f <br /> ri <br /> 6ETTLER - RYAN INC. <br /> February 18, 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 Fourth Quarter 1998 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 GettIer-Ryan <br /> Inc (G-R) On November 23, 1998, 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 Potentiometric Map is included as Figure 1 <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 /> Lerely, <br /> a rading �y,��QND GE�I <br /> Project Coordinator <br /> COD <br /> Stephen J Carter No.5577 <br /> Senior Geologist, R G No 5577 <br /> Figure 1 Potentiometric Map OF CAL 1F0��`� <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 />