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6ETTLER - RYAN I <br /> December 22, 1999 <br /> G-R Job #280054 <br /> Mr Robert A Boust <br /> Unocal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Fourth Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station #12859 <br /> 1665 Pacific Avenue <br /> Stockton, 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 November 22, 1999, field personnel monitored and sampled eleven wells (MW-1 through <br /> MW-10 and NP-1) 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 Dissolved Oxygen Concentrations are summarized in <br /> . Table 6 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 through 4 A Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also <br /> attached <br /> Si erely, <br /> Ding� 0� '1•�q9 01�cs'l► <br /> Project Coordinator h <br /> No.5577 <br /> Stephen J Carter <br /> Senior Geologist, R G No 5577 <br /> Figure 1 Potentiometnc Map OF CAS-�F�Q <br /> Figure 2 Concentration Map <br /> Table 1 Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results-Oxygenate Compounds <br /> Table 3 Groundwater Analytical Results <br /> .� Table 4 Groundwater Analytical Results <br /> Table 5 Groundwater Analytical Results-General Minerals <br /> Table 6 Dissolved Oxygen Concentrations <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> zssv Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J 9 Dublin , California 94568 ( 925 ) 551 - 7555 <br />