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f Yr <br /> • <br /> GETTLER- — RYAN INC. a1J <br /> July 27, 1998 <br /> Mr Edward C Ralston , G-R Job #180137 <br /> Tosco Marketing Company <br /> 2000 Crow Canyon Place, Suite 200 <br /> San Ramon, California 94583 <br /> RE Second Quarter 1998 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 quarterly groundwater monitoring and sampling event performed by Gettler- <br /> Ryan, Inc (G R) On June 17, 1998, field personnel monitored and sampled eleven wells (MW-1, MW-2, <br /> MW-3,MW-4D,MW4S,MW-5D,MW-5S, MW-6D, MW-6S, MW-7D, and MW-7S) at the referenced <br /> 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 Potentiometnc Map is included as Figure 1 <br /> Groundwater samples were collected from the monitoring wells as specified by 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, and a Concentration <br /> Map is included as Figure 2 The chain of custody document and laboratory analytical reports are also <br /> attached <br /> Sincerely, <br /> ' �`S�ERED G�O�p <br /> Deanna L�Hardtng(J ' Q�' Q`��'l'C�a�''��� <br /> Protect Coordinator Ey <br /> _:Z= * No.5577 <br /> Stephen J Carter CP <br /> Senior Geologist, R G No 5577 <br /> OF CA01f��� <br /> Figure 1 Potentiometnc Map <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 qMI Chain of Custody Document and Laboratory Analytical Reports <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 925 ) 55 1 - 7555 <br />