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19 6ETTLER - RYAN INC. - <br /> July 6, 1999 <br /> . Robert A. Boust G-R Job 11280046 <br /> notal -DBGIAMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> IRE. Second Quarter 1999 GroundwaterMonitoring & Sampling Report <br /> Former Unocal Service Station 1!5098 <br /> 5606 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 June 17, 1999, field personnel monitored and sampled seventeen wells (MW-10A, MW-10 <br /> MW-11, MW-12, MW-13, MW-14A, MW-14 through MW-18, MW-19D. MW-19S. MW-21D, MW-21S, <br /> 1 MW-22D, and MW-22S) at the above referenced site In addition, Environmental Audit, Inc performed the <br /> scheduled joint monitoring at the Montgomery Ward Auto Service Center located on Pacific Avenue in <br /> Stockton, California, and the data is presented in Table 3 <br />' Staticg roundwater levels were measured and all wells at the referenced site were checked for the presence of <br /> livpealrate-phase hydrocarbons Separate-phase hydrocarbons were not present in any of the wells Static water <br /> data and groundwater elevations are summarized in Table 1. A Potentiometric Map is included as Figure <br /> IGroundwater 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 /> S erely, <br /> r <br /> �v&D G�O <br /> Deanna L Harding <br /> ' <br /> Project Coordinator Q 2N N <br /> No 6676 <br /> Barbara Sieminski (PA <br /> Project Geologist, R.G. No. 6676 9jFO �_c � <br /> ' � CA <br /> Figure I Potentiometric Map <br /> Figure 2 Concentration Map <br /> _Table 1 Groundwater Monitonng Data and Analytical Results <br /> Table 2 Groundwater Analytical Results - Oxygenate Compounds <br /> Table 3 Joint Groundwater Monitoring Data and Analytical Results <br /> attachments Standard Operating Procedure- Groundwater Sampling <br /> Feld Data Sheets <br /> 5,E qd Chain of Custody Document and Laboratory Analytical Reports <br /> 47 Sierra Court , Suite J - Dublin , California 94568 ( 925) 551 - 7555 <br />