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1998 <br /> FL <br /> "� ' C. <br /> � N Itil <br /> ETTIER Y <br /> arc , <br /> 3 G-R Job #280054 <br /> Mr Robert A Boust <br /> Unocal - DBGIAMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station #2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This report documents the groundwater monitoring and sampling event performed by Gettler-Ryan Inc (G- <br /> R) On March 6, 1998, field personnel monitored and sampled nine wells (MW-1 through MW-9) at the <br /> 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 i and a <br /> 0 Concentration Map is included as Figure 2 <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 through 4 Dissolved <br /> Oxygen Concentrations are summarized in Table 5 The chain of custody document and laboratory <br /> analytical reports are also attached <br /> Sincerely, <br /> CZE 1 \S �F0/a <br /> keana L Harding ���`� �'C'4gJ.�i�� <br /> Project Manager c <br /> • No.5577 <br /> Stephen J Carter <br /> Senior Geologist, R G No 5577 ��9 2►� <br /> �4F CAV1F�Q, <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 <br /> Table 3 Groundwater Analytical Results <br /> Table 4 Groundwater Analytical Results - Oxygenate Compounds <br /> . Table 5 Dissolved Oxygen Concentrations <br /> Attachments Standard Operating Procedure - Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 67 �11�9gVierra Court , Suite ,I - Dublin , California 94568 ( 5 10 551 - 7555 <br />