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6ETTLER - RYAN INC. <br /> ova <br /> December 28, 2001 <br /> G-R Job#180137 <br /> Mr Edward C Ralston <br /> Phillips 66 Company <br /> 1380 Lead Hill Road, Suite 120 <br /> Roseville, California 95661 <br /> RE Fourth Quarter Event of November 19 and 20, 2001 <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 monthly site visits and the most recent groundwater monitoring and sampling event <br /> performed by Gettler-Ryan Inc (G-R) at the referenced site All field work was conducted in accordance with G-R <br /> Standard Operating Procedure -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 Potentiometnc Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by Standard Operating Procedure - <br /> Groundwater Sampling(attached) The field data sheets are also attached The samples were analyzed by Sequoia <br /> Analytical Analytical results are sunumrized in Tables 1 and 2 A Concentration Map is included as Figure 2 The <br /> chain of custody document and laboratory analytical reports are also attached <br /> Sincerely, <br /> Deanna L Harding <br /> Project Coordinator <br /> CIO�rQC� <br /> V <br /> W No rC 55734 M <br /> Exp <br /> Hagop Kevork <br /> P E No C55734 ��q clvl1_ <br /> Figure 1 Potentiometric Map- Shallow Zone OF 0 A4�F�� <br /> Figure 2 Concentration Map <br /> Table 1 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 /> 5886 qm) Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , 8uite J • Dublin , California 94568 ( 925) 551 -7555 <br />