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ARCADIS Ms. Kathryn Dominic <br /> November 5, 2010 <br /> The historical sampling results presented in Attachments 2 through 5 are intended to <br /> support the evaluation in the 2010 Investigation Report (ARCADIS 2010). <br /> RWQCB Comment: Unless unrestricted use is achieved at this site a Land Use <br /> Covenant in the form of a Deed Restriction will be necessary. <br /> Response: UPRR understands that a Land Use Covenant in the form of a Deed <br /> Restriction may be necessary for the Site. <br /> Summary and Recommendations <br /> Based on the data summarized in this letter and post remediation investigations <br /> summarized in the 2010 Investigation Report, the biotreatment of the TPCA pond <br /> was effective, has not adversely affected the environment, and has achieved the <br /> intent and substantive requirements of the site cleanup and abatement order(CAO) <br /> No. 92-707. Soils remaining in the biotreatment beds do not pose a risk to human <br /> health or sensitive ecological receptors. No further action is recommended for the <br /> biotreatment beds at the Site. <br /> Closing <br /> If you have any questions or comments regarding the contents of this letter please <br /> contact Mr. James Eisert at 916.786.1871. <br /> Sincerely, <br /> ARCADIS U.S., Inc. <br /> James Eisert, PG (No. 7000), CHG (No. 779) <br /> Principal Hydrogeologist <br /> Senior Project Manager <br /> -J-'�4D <br /> J. Scott Davis, PE (No. C66639) <br /> Principal Engineer <br /> Program Manager <br /> Page: <br /> P,tARCADIS Data\Projects-Active\Union Pacific Railroad1RC709-Tracy Mnt FacilitylDeliverablesQO10-11 Biotreatment Bed Response to RWQCBIBiotrtmnt_Beds_RTC_Ltr(11-05-10).docx 5/7 <br />