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r] <br /> r <br /> GETTLER - RYAN INC. +_ <br /> October 18, 1999 <br /> G-R Job #280046 <br /> Mr Robert A Boust <br /> Uncal - DBG/AMG <br /> 2121 North California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> RE Third Quarter 1999 Groundwater Monitoring & Sampling Report <br /> Former Unocal Service Station /#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 September 16, 1999, field personnel monitored and sampled eighteen wells (MW-10A, MW- <br /> 10,MW-11,MW-12,MW-13, MW-14A,MW-14 through MW-18,MW-19D MW-19S, MW-21D, MW-21S, <br /> MW-22D, MW-22S and one iri igation well at Delta College) at the above referenced site In addition <br /> Environmental Audit Inc performed the scheduled ,joint monitoring at the Montgomery Ward Auto Service <br /> Center located on Pacific Avenue in Stockton Califoi nia and the data is presented in Table 3 <br /> Static groundwater levels were measured and all wells at the referenced site were checked for the presence of <br /> separate-phase hydi ocarbons Sepai ate-phase hydrocai bons were not pi esent in any of the wells Static water <br /> level data and groundwater elevations are summarized in Table 1 A Potentiometric Map is included as Figure <br /> l <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 summai ized in Tables l and 2 A Concentration Map <br /> is included as Figure 2 The chain of custody document and 1 aboi atoi y analytical i epoi is ai e also attached <br /> erely, <br /> ED CEO, <br /> D anna L Harding <br /> Protect Coordinator Q Co <br /> No 5577 <br /> Stephen J Cart <br /> Senioi Geologist R G No 5577 1p.' <br /> 9TFDF CA <br /> { <br /> Figure I Potentiometric Map <br /> Figure 2 Concentration Map <br /> Table I Groundwater Monitoring 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 /> Field Data Sheets <br /> 511�Bgml Chain of Custody Document and Laboeatory Analytical Reports <br /> 6747 Sierra Court , Suite J - Dublin , California 94568 ( 925 ) 551 - 7555 <br />