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Ms. Katie Hower -2- 1 May 1996 <br /> Based on the above, further work will be required at the site to determine the threat contaminated soils <br /> pose to ground water and whether ground water has already been impacted. An additional (or <br /> replacement) monitoring well needs to be placed directly downgradient of the source area. Soil and <br /> ground water samples should be sampled and analyzed for TPH as diesel and gasoline using the purge <br /> and trap sample preparation method. Samples also should be analyzed for benzene, toluene, ethylbenzene <br /> and xylenes, lead, PNAs and crude oil. I approve of using the silica gel cleanup technique to remove <br /> those polar materials which could produce false positive results for petroleum hydrocarbons. Therefore, <br /> by 24 May 1996, please submit a work plan which addresses all of the above issues and a schedule for <br /> implementing the work. <br /> If you propose to leave contaminated soils in place, you must show that doing so will not degrade ground <br /> water. In addition to ground water monitoring, an appropriate way to make this determination is to <br /> conduct leachability, studies, using the waste extraction test. Therefore, by 2.4 May 1996, please submit a <br /> work plan for either removing or remediating the insitu contaminated soils, or conducting leachability <br /> tests to determine the feasibility of leaving the soils in place without affecting ground water quality. <br /> If you have any questions, you may call me at (916) 255-3077. <br /> /') '�--CD <br /> JOEL M. WEISS <br /> Engineering Geologist <br /> JMW:jmw/lm <br /> cc: San Joaquin County Public Health Services, Stockton <br /> Mr. Kevin Smith, Rural California Housing Corporation, Sacramento <br /> Mr. George Forsythe, EMCON, Fresno <br />