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.R <br /> F " <br /> EI Dorado Environmental, Inc. <br /> ' 2221 Goldorado Trail, EI Dorado, California 95623 <br /> (916) 626-3898 <br /> Fax (916) 626-3899 <br /> f <br /> i ,e q <br /> December 19, 1997 <br /> i <br /> Mr. Kenneth Earnest <br /> jSenior Project Manager <br /> Ultramar Inc. <br /> 525 West Third Street <br /> { <br /> Hanford, California 93230 <br /> Subject: Fourth Quarter 1997 Ground Water Monitoring Report <br /> Beacon Station #474 <br /> 3440 East Main Avenue, Stockton, California <br /> 1 <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 November 21, 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, the pattern of ground' <br /> water flow is predominantly toward the southeast, with a component of flow toward the north; <br /> { (Figure 2)at a gradient of less than 0.01 foot per foot. Because ground water is above the uppermost <br /> ,i screened interval in monitoring wells MW-1, MW-2, and MW-3, ground water elevations measured' <br /> in these monitoring wells were-not used to construct Figure 2. Ground water elevations have. <br /> `? decreased an average of 0.85 feet compared to the last monitoring event. <br /> `i <br />