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i <br /> I ' <br /> GETTLER - RYAN INC. <br /> June 13, 2003 <br /> G-R Job#180137 <br /> Mr Edward C Ralston <br /> ConocoPhillips <br /> 76 Broadway Avenue <br /> Sacramento, California 95818 <br /> RE- Second Quarter Event of May 7 and 8, 2003 <br /> Groundwater Monitoring & Sampling Report <br /> Tosco(Unocal) Service Station#5886 <br /> 2701 West March Lane <br /> Stockton, California <br /> Dear Mr Ralston <br /> This report documents the most recent groundwater monitoring and sampling event performed by Gettler-Ryan Inc <br /> (G-R)at the referenced site All field work was conducted in accordance with G-R Standard Operating Procedure- <br /> Groundwater Sampling (attached) <br /> Static groundwater levels were measured and all wells were checked for the presence of separate-phase hydrocarbons <br /> Separate-phase hydrocarbons were not present in the wells Static water level data and groundwater elevations are <br /> summarized in Table 1 A Potentiometric Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells and submitted to a state certified laboratory for <br /> analyses The field data sheets for this event are attached Analytical results are presented in the table(s)listed below <br /> A Concentration Map is included as Figure 2 The chain of custody document and laboratory analytical reports are <br /> also attached <br /> Sincerely, <br /> It <br /> i <br /> Deanna L Harding <br /> Project Coordinator D AG�Egp�O <br /> �4 <br /> O <br /> No 7285 � <br /> Robert C Mallory (P Exp Ql 0 <br /> Registered Geologist, No 7285 '9 <br /> �OF CA4�F <br /> Figure 1 Potentiometric Map-Shallow Zone <br /> Figure 2 Concentration Map <br /> Table l Groundwater Monitoring Data and Analytical Results <br /> Table 2 Groundwater Analytical Results- Oxygenate Compounds <br /> Attachments Standard Operating Procedure-Groundwater Sampling <br /> Field Data Sheets <br /> 5885 gml Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Caurt , Shite J • Dublin , California 94568 (925 ) 551 - 7555 <br />