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• <br /> GETTLER - RYAN INC. <br /> - October 1, 1999 <br /> G-R Job #280045 <br /> Mr Robert A Boust <br /> Unocal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Third Quarter 1999 Groundwater Monitoring & SampIing Report <br /> Former Unocal Service Station #0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> Dear Mr Boust <br /> This report documents the quarterly groundwater monitoring and sampling events performed by Gettler-Ryan <br /> Inc (G-R) On August 20, 1999, field personnel monitored sixteen wells (U-1 through U-9, UVA, NP-1-22, <br /> NP-1-65, NP-1-111, NP-2-22 NP-2-60 and NP-2-116) and sampled fifteen wells (U-1 through U-9, NP-1- <br /> 22, NP-1-65, NP-1-111, NP-2-22, NP-2-60 and NP-2-116 ) 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 for both events are also attached The <br /> samples were analyzed by Sequoia Analytical Analytical results are summarized in Tables 1 through 5 A <br /> Concentration Map is included as Figure 2 Chain of custody documents and laboratory analytical reports <br /> ate also attached <br /> cerely, <br /> Deanna L Harding r,�� FOL <br /> Project Coordinator ��v��VG <br /> No. 6N2 <br /> Dou las Lee <br /> Senior Geologist R G No 6882 <br /> OF CA 1 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 { 925 ) 551 - 7555 <br />