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Mr. Steve M. Ferrara -2- <br /> source; and another well be placed at the eastern corner of the property to <br /> determine the limit of contamination in that section and also to find out if <br /> contamination has gone offsite. The only ground water test results we have <br /> are of samples taken in November 1988. Since these results show contamination <br /> in M-3, it is likely that contamination has gone offsite in the area next to <br /> M-3. <br /> Investigations at the ARCO facility, which is northwest of SFPP, have shown <br /> that a vertical gradient exists at its site probably due to some heavy pumping <br /> which has resulted in several ground water depressions in east Stockton. This <br /> vertical gradient has caused contamination which has been detected in wells <br /> screened at depths of 80 feet. Therefore, we recommend that you install well <br /> clusters to delineate the vertical extent of ground water contamination at <br /> your facility. <br /> Please submit a revised work plan by 16 July 1992 which addresses the above <br /> comments. If you have any questions, you may call me at (916) 361-5650. <br /> ga '/9- ' � ' <br /> PHILPP S. ISORENA <br /> Sanitary Engineering Associate <br /> PSI: Idj <br /> cc: Ms. Harlin Knoll , San Joaquin Local Health District, Stockton <br /> Mr. Alexander Krygsman, Port of Stockton, Stockton <br /> Mr. Roy Thun, ARCO, Los Angeles <br /> Mr. James Holland, Santa Fe Pacific Pipeline Partners, Los Angeles <br /> Mr. Michael L. Branch; Luce, Forward, Hamilton and Scripps; San Diego <br /> Mr. Peter B. Hudson, Hart Crowser, Inc. , San Francisco <br />