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I <br /> O Knowledge of the contaminant source and site geology is <br /> essential for evaluating pot ntial routes of contaminant <br /> migration. This information should then guide the <br /> development of a sample plan that adequately characterizes <br /> the type and extent of the contamination, and to locate ; <br /> appropriate and specific sample locations . <br /> I <br /> Once the contaminant source and its status is positively <br /> identified and the extent of contamination is adequately <br /> characterized, a specific course o action may be developed to <br /> mitigate the problem at the site, At such time, it would not be <br /> necessary to do additional sampling in areas of Parcel A or B <br /> which were not likely to be affectecl by the identified source of <br /> contamination. We believe that an investigation of this nature_ <br /> y <br /> --: -...�-.�• --,�:wool=d-Apr-ov-e-@t-o��--mo-re=ctis-t—effect �ve�nd'�w-ou1.�"'better address <br /> the problem at the site. <br /> Several areas in and around the City of Tracy, have been <br /> identified as having similar "bunker" and diesel oil <br /> contamination. At these sites, a point source of the <br /> contamination has been found, usually associated with the past or <br /> present storage, use and/or transport of these oils. As an <br /> initial starting point for the ty e of investigation outlined <br /> above, it would be prudent to closely examine the historical land <br /> uses at the site, and to evaluate past and present use and <br /> transport of these oils, in association with the railroad <br /> right-of--way adjacent to Byron Road. <br /> Thank you for the opportunity to comment on this project. We <br /> hope this information is useful to you. Although the Department <br /> is currently unable to provide direct oversight on this project, <br /> we would appreciate being kept up tc date with the results of the <br /> investigation as it proceeds. If you have any questions or <br /> comments, please contact Scott Flint or me at (916) 920 -7525. <br /> Sincerely, -- <br /> Charles A. Mc a ghlin <br /> Senior Hazardous Materials Specialist <br /> Region I <br /> cc: Ms. Antonia vorster <br /> Regional Water Quality Control Board, Sacramento <br /> Mr Ronald Valinati, "Dixectorz <br /> San Joaquin,LocalHealth' Distr' ct Stockan <br /> SF:gep <br />