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41 <br /> I <br /> 4 <br /> _ w INc. <br /> ETTLER }°�4N <br /> January 2, 1998 <br /> RECEIVED <br /> Mr Ed Ralston JAN 0 9 1998 <br /> Tosco Marketing Company <br /> 2000 Crow Canyon Place, Suite 400 BY <br /> San Ramon, California 94583 <br /> Subject: Addendum to MPDS Quarterly Monitoring Report for Fourth Quarter 1997(Report <br /> No. UN6981-1, dated August 18, 1997) at Tosco (Unocal) Facility No. 6981, 4707 <br /> Pacific Avenue, Stockton, California <br /> Mr Ralston <br /> At the request of Tosco Marketing Company, Gettler-Ryan Inc (GR)collected groundwater samples from <br /> wells MW-2, MW-4, MW-5, MW-6, MW-7, MW-9, VW-( and VW-3 on December 8, 1998 Well <br /> locations are shown on Figure 2 Prior to sample collection, the depth to water was measured and each <br /> well checked for the presence of floating product Floating product was not observed in any of the wells <br /> Water level and floating product data are summarized in the attached table Copies of the field data <br /> sheets and GR Field Methods and Procedures are attached <br /> Each well was purged prior to sampling Water was placed in properly labelled drums and stored at the <br /> site pending proper disposal Samples were then collected from the wells using new, clean disposable <br /> bailers Samples were decanted from the bailers into appropriate containers supplied by the laboratory <br /> The samples were then sealed, labelled, placed in chilled storage, and transported under chain-of-custody <br /> to Sequoia Analytical (FLAP #1210) <br /> The samples were analyzed for oxygenate compounds using EPA Method 8260 and Industrial Solvent <br /> Scan Results are summarized in the table Copies of the laboratory report are attached <br /> If you have questions, please call us in Sacramento at (916) 631-1300 <br /> Sincerely, <br /> Gettler- yan Inc. <br /> Stephen J Cart r, RG <br /> Senior eologist <br /> Gre A Gurss <br /> Project Manager <br /> Attachments Table 1 Groundwater Monitoring and Analytical Data <br /> Figure 2 Site Plan <br /> Field Methods and Procedures <br /> Field Data Sheets <br /> Laboratory Report and Chain-of-Custody <br /> 6747 B-VcZ' ra Court , Suite J Dublin , California 94568 ( 51 0 ) 551 -7555 <br />