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Z S t <br /> • <br /> i <br /> GETTLER - RYAN INC. <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 /> • <br /> RE Second Quarter 1998 Groundwater Monitoring & Sampling Report <br /> Tosco (Unocal) Service Station#5886 <br /> 2701 West March Lane <br /> Stockton, Califorrua <br /> • <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, MW-4S, 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 /> 09 groundwater elevations are summarized in Table 1 A Potentiometric 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 /> ED GF0I <br /> • Deanna L Harding <br /> Project Coordinator i% <br /> * No. 5577 - <br /> Stephen J Carter tP <br /> NX- <br /> • Senior Geologist, R G No 5577 9 <br /> lFOF CAUFO� <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 /> sassymt Chain of Custody Document and Laboratory Analytical Reports <br /> • 6747 Sierra Court , Suite J - Dublin , California 94568 - ( 925 ) 551 - 7555 <br />