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4 <br /> EI Dorado Environmental, Inc. <br /> • 2221 Goldorado Trail El Dorado California - <br /> 95623 (916) 626-3898 <br /> Fax (916)626-3899 <br /> July 30, 1998 <br /> Mr. Joe Aldridge <br /> Senior Project Manager <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Second Quarter 1998 Ground Water Monitoring Report <br /> Beacon Station #474 <br /> i3440 East Main Avenue, Stockton, California <br /> Dear Mr. Aldridge: <br /> El Dorado Environmental, Inc. (EDE) has prepared this report to document the results of quarterly <br /> ground water monitoring conducted on June 10, 1998, at the subject site (Figure 1). The monitoring, <br /> conducted by Doulos Environmental (Doulos), included measurements of depth to ground water, <br /> subjective analysis for the presence or absence of free product, ground water purging and collection <br /> of ground water samples. Doulos reports that all field activities were conducted in accordance with <br /> 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 gradient of ground <br /> water flow is relatively flat (0.02 to less than 0.01 foot per foot); as a result, no predominant <br /> direction of ground water flow is indicated on Figure 2. Because ground water is above the <br /> uppermost screened interval in monitoring wells MW-1,MW-2,and MW-3, ground water elevations <br /> measured in these monitoring wells were not used to construct Figure 2. Ground eater elevations <br /> have increased an average of 3.66 feet compared to the last monitoring event. <br />