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EI Dorado Environmental, Inc. <br /> 2221 Goldorado Trail, EI Dorado, California 95623 (916) 626-3898 <br /> Fax (916) 626-3899 <br /> May 21, 1997 JUN 0 5 1997 <br /> ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Mr. Kenneth Earnest <br /> Senior Project Manager <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: First Quarter 1997 Ground Water Monitoring Report <br /> Beacon Station #474 <br /> 3440 East Main Avenue, Stockton, California <br /> Dear Mr. Earnest: <br /> El Dorado Environmental, Inc. (EDE) has prepared this report to document the results of quarterly <br /> ground water monitoring conducted on March 27, 1997 at the subject site (Figure 1). The <br /> monitoring, conducted by Doulos Environmental (Doulos), included measurements of depth to <br /> ground water, subjective analysis for the presence or absence of free product, ground water purging <br /> and collection of ground water samples. Doulos reports that all field activities were conducted in <br /> accordance with the Ultramar Field Procedures described in Attachment A. <br /> GROUND WATER ELEVATIONS <br /> Prior to purging, Doulos collected depth to ground water measurements. Copies of Doulos' field <br /> data sheets are contained in Attachment B. Ground water elevation data collected since December <br /> 1993 are summarized in Table 1. On the basis of the current measurements, ground water flows <br /> toward the south-southeast (Figure 2) at a gradient of less than 0.01 foot per foot. Ground water <br /> elevations have increased an average of 3.01 feet compared to the last monitoring event. <br />