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EI Dorado Environmental, Inc. <br /> t 2221 Goldorado Trail, EI Dorado, California 95623 (916) 626-3898 <br /> Fax (916)626-3899. <br /> I <br /> I � . <br /> II June 4, 1998 <br /> JUN 2 9 1998 <br /> 1;NVIRONMENTAI_HEALTH <br /> pERMIT l St:RVICES <br /> Mr. Joe Aldridge <br /> Senior Project Manager <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: First Quarter 1998 Ground Water Monitoring Report <br /> Beacon Station #474 <br /> 3440 East Main Avenue, Stockton, California <br /> 1 R <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 March 31, 1998, 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 /> i <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 ground water <br /> gradient beneath the site is relatively flat (there is only a difference in ground water elevations of <br /> 0.20 foot across the site); no predominant direction of ground water flow is defined. Because ground <br /> water is above the uppermost screened interval in monitoring wells MW-1, MW-2, and MW-3, <br /> ground water elevations measured in these monitoring wells were not used to construct Figure 2. <br /> I Ground water elevations have increased an average of 3.87 feet compared to the last monitoring <br /> event. <br /> } <br /> 1 <br /> I <br />