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July 6,2005 <br /> NOA Project Number: E05007B <br /> In regards to the existing contamination in the Tracy area, the 448-acre Tracy Defense Depot site <br /> was an Army Supply Depot from 1942 to 1963 when it was turned over to the Defense Logistics <br /> Agency as a source of potential groundwater contamination. Operations at the facility included <br /> repackaging of leaking chemical containers, fumigating shipping materials,maintaining vehicles, <br /> painting, storing chemicals,preserving metal parts, operating chemical and photographic <br /> laboratories, storing and mixing pesticides and storing and treating liquid and solid wastes. Currently, <br /> all solid hazardous waste is hauled off site to Federally-approved disposal facilities. The shallow <br /> aquifer below the Tracy Defense Depot is contaminated with volatile organic compounds (VOCs); <br /> i.e.,TCE,PCE and DCE.' <br /> In addition,the Surface Subsurface Contamination Report was prepared by our office for the <br /> property. That type of report is done specifically to assess contamination on site. Rather than <br /> reiterate information our office cites the previous report in section 4.2 of the Soil Suitability Study. <br /> " 5.2:As you noted,there was an error in the report as to our percolation test hole diameter.The <br /> P` percolation test holes were drilled with a three inch diameter hand auger. When the drilling of the <br /> holes is complete, the diameter of the hole is four inches.We have replaced our three inch diameter <br /> -1hand auger with a four inch diameter auger, to avoid confusion and to insure that our holes fully <br /> 4 q comply with EHD requirements. <br /> J, We appreciate your recommendations for this project and your continued interest in our work. <br /> Best Regards, <br /> NEIL O.ANDERSON&ASSOCIATES,INC. \AED G00 EU; <br /> � O Na. 2151 <br /> / CERTIFIED <br /> r ENGINEERING <br /> Rebe T GEOLOGIST Haskett,B.S. David J. Welch,M.Sc. � �;.. <br /> Project Manager CEG-2151, CHG-653, GP-1049 <br /> Environmental Division Manager UFCt_ <br /> CC: Mr. and Mrs. Reece <br /> P.O. Box 299 <br /> Tracy,CA 95378 <br /> 'U.S.Environmental Protection Agency,2005,http://yosemite.epa.gov <br />