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WHF+ ' WHF Environmental Consultants, Inc. <br /> F Post Office Box 6729 <br /> Modesto, CA 95355-6729 <br /> (209) 579-8138 <br /> February 27, 1993 <br /> Mary Meays, REHS ' <br /> Environmental Health Division 14;E1 <br /> San Joaquin County Public Health Services MAPS <br /> P.O. Box 2009 NVIRONMWA gki <br /> Stockton, California 95201j � � <br /> " E: - Union Ice <br /> 425 North Union St. <br /> Stockton, California 95205 <br /> Dear Ms. Meays, <br /> This letter is written as a response to your comments which were conveyed in a letter from <br /> your department dated October 7, 1992, regarding the "Re-excavation Work Plan and <br /> Installation of Additional Monitoring Wells".dated August 28, 1992 and prepared by WHF <br /> Environmental Consultants, Inc., <br /> WHF Environmental Consultants will notify.PHS/EHD at least 48 hours in advance of any <br /> sampling activity at the site so that a PHS/EHD representative can inspect the sampling <br /> events. WHF will collect sidewall samples aviritervals of at least every 20 linear feet in the ' <br /> excavation and two bottom samples will also be collected. <br /> Confirmation samples of the excavation will-be, for the following constituents: <br /> p • <br /> TPH-gasoline, TPH-diesel,.BTXE, oil and grease, arsenic, barium-and silver.. The metals <br /> analyses will be performed using extraction by�deionized water, instead.of citric acid. <br /> The stockoile of soil removed from the=eXcavation wilrbb placed on and covered by <br /> plastic, pending analytical results, treatment and/or disposal. One discrete sample will be <br /> collected and analyzed from the stockpile for every 25 yards of excavated material. <br /> Your letter expressed concern that the proposed monitoring wells would only provide <br /> limited information regarding the boundaries of ground water contamination, since they <br /> would not be close enough to documented soiVand ground water contamination. It should <br /> be noted that there has never been ground water contamination documented for this site. <br /> However, to address the concern of the distance between the wells and the contaminant <br /> sources, we propose that the well in the vicinity of Tank #4 be moved closer to the former <br /> location of the tank and be collared a distanceof approximately fifty feet from it. Also, <br /> the second well, which was proposed to the Edst across Union Street, will be moved <br />