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it <br /> t S <br /> GETTLER - RYAN INC. <br /> October 6, 1999 <br /> G-R Job ##280047 <br /> Mr Robert A Boust <br /> Unocal - DBGIAMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creels, California 94596 <br /> RE Third Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station ##0123 <br /> 1034 Central Avenue <br /> Tracy, California <br /> Dear Mr Boust <br /> This report documents the quarterly groundwater monitoring and sampling event performed by Gettler-Ryan <br /> Inc (G-R) On September 9 1999, field personnel monitored and sampled six wells (U-1 through U-6) at <br /> 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 ptesent in the wells Static water level data and <br /> groundwater elevations are summarized in Table I A Potentiometric Map is included as Figure I <br /> Groundwater samples were collected fiom 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 summai ized in Tables 1 through 4 A Concentration <br /> Map is included as Figtire 2 The chain of custody document and laboiatoiy analytical reports are also <br /> attached <br /> cerely <br /> r,,C <br /> b anna � rdln Gets Q <br /> ro�ect o rdinator <br /> NO. 6882 <br /> Dou,,las Lee �r <br /> Senior Geologist R G No 6882 cnT <br /> q <br /> Figure 1 Potentiometric Map TF OF Cly <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and An4lytical Results <br /> Table 2 Groundwater Analytical Results <br /> Table 3 Groundwater Analytical Results-Oxygenate Compounds <br /> Table 4 Groundwater Analytical Results(EPA�Mtthod 8010 <br /> Attachments Standard Operatin- Procedure -Groundwater Sampling <br /> Field Data Sheets <br /> Chain of Custody Document and Laboratory Analytical Reports <br /> 8123 qml <br /> 6747 Sierra Court , Suite J Dublin , California 94568 { 925) 551 - 7555 <br />