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Tracy Cold Storage j <br /> Addendum to Case Closure Request �"••+� <br /> Page:3 <br /> • Monitoring well MW-9 was installed down-gradient from the former UST into the <br /> second aquifer and has indicated non-detectable levels of gasoline and gasoline <br /> constituents. This indicates that a good confining layer exists between the first and <br /> second aquifers and that it has prevented the vertical migration of contaminants. <br /> Also, the subsurface materials have demonstrated_an ability to adsorb significant <br /> levels of gasoline and gasoline constituents further reducing the, mobility of the <br /> contaminants. <br /> • Minimization of the withdrawal of water from the South Well will similarly minimize <br /> the potential for contaminant migration. <br /> Based on the items outlined above, AGS recommends that the North Well be <br /> permanently wired to be used as the primary water well and the South Well wired to be <br /> used as the supplemental water source. Since the North Well is capable of meeting most <br /> of the plant's water needs, it is unlikely-that the South Well will be utilized except during <br /> times of peak water use and in the event of the failure of the North Well pump. .It is our <br /> conclusion that this approach provides the most cost-effective alternative that remains <br /> protective of the waters of the State. <br /> If you should have any questions regarding this information, please do not hesitate to <br /> contact us. Your favorable consideration of this request would be greatly appreciated. <br /> Respectfully submitted, <br /> GLEN � <br /> 1NHffE -` <br /> NO.6563 `Q- <br /> Glen T. White, R.G. '9 <br /> enior Geologist �CF CAS-SFO4 <br /> xc: Margaret Lagorio, San Joaquin Public Health Services <br /> Doug Schneeberger, Western Refrigerating & Cold Storage Company <br />