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t • • <br /> GETTLER - RYAN INC. <br /> January 8, 1998 <br /> Mr Bob Boust <br /> Unocal Corporation - DBG/AMG <br /> 2121 N California Boulevard, Suite 250 <br /> Walnut Creek, California 94596 <br /> Subject: Supplemental Sampling at Former Ur al Station No. 0187, 437 East Mind-Avenue, <br /> Stockton, California <br /> Mr Boust <br /> At the request of Unocal Corporation, Gettler-Ryan b= (GR) collected groundwater samples from well <br /> UV-1 on December 15, 1997 Well Iocation is shofi on Figure 2 Prier to sample collection, the depth <br /> to water was measured and the well checked for the preger= of floating pToduct. A product sheen was <br /> noted on the water, but floating product was not present Water level and floating product data are <br /> summarized in the attached table GR Field Methods slid Procedures are attached <br /> The well was not purged prior to sampling The groundwater sample was collected from the well using <br /> anew, clean disposable bailers, then decanted into appropriate containers supplied by the laboratory The <br /> .+ sample bottles were then sealed, labelled, placed in chilled storage, and transported under chain-of- <br /> custody to Sequoia Analytical (ELAP #1210) Mr Mike Infurna of San Joaquin County Public Health <br /> Services was present to observe sampling <br /> The sample was analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg) and benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX)by EPA Methods 8O15Mod 18020, and for oxygenate compounds <br /> by EPA Method 8260 Results are summarized in the table Copies of the laboratory reports are <br /> attached <br /> If you have questions, please call us in Sacramento at (916) 631-1300 <br /> Sincerely, <br /> Gettler-Ryan Inc. <br /> Stephen J Ca er, RG <br /> Senior Geologist <br /> Q <br /> Gre A Gurss <br /> Project Manager <br /> Attachments Table 1 Groundwater Monitoring and Analytical Data <br /> Figure 3 Site Plan <br /> Field Methods and Procedures <br /> Laboratory Reports and Cham-of-Custody <br /> 482707-1 <br /> 6747 Sierra Court , Suite J Dublin , California 94568 ( 5 10 551 - 7555 <br />