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ARCADIS <br /> ARCADIS U.S.,Inc. <br /> Infrastructure•Water•Environment•Buildings 1410 Rocky Ridge Drive <br /> Suite 330 <br /> Roseville <br /> California 95661 <br /> Tel 916.786.0320 <br /> Mr. Eric Rapport, CHG, CEG Fax 916.786.0366 <br /> Senior Engineering Geologist www.arcadis-us.com <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 415 Knollcrest Drive, Suite 100 <br /> Redding, California 96002 ENVIRONMENTAL <br /> Subject: <br /> Response to Comments—Monitored Natural Attenuation Implementation Plan <br /> Union Pacific Railroad Company Date: <br /> Storrie, CA—June 30, 2007 Derailment April 26, 2011 <br /> Contact: <br /> Dear Mr. Rapport: James E. Eisert <br /> ARCADIS U.S., Inc. (ARCADIS) has prepared this response to comments letter on Phone: <br /> behalf of the Union Pacific Railroad Company (UPRR) regarding the Storrie, CA— (916) 786-1871 <br /> June 30, 2007 Derailment site located along Highway 70 in Storrie, Plumas County, <br /> Email: <br /> California (the Site). James.Eisert@ <br /> arcadis-us.com <br /> This letter presents responses to comments received from the California Regional <br /> Water Quality Control Board (RWQCB) regarding the "Monitored Natural Attenuation Our ref: <br /> Implementation Plan, Union Pacific Railroad Company, Storrie, CA," prepared by RC000738.0001 <br /> ARCADIS and dated March 14, 2011 (the MNA IP). The RWQCB provided <br /> comments regarding the MNA IP to ARCADIS in an email dated April 4, 2011. <br /> Response to Comments <br /> ARCADIS has prepared responses to the RWQCB's comments (noted in italics) as <br /> presented in the follow text. <br /> RWQCB General Comment: The MNA Work Plan, as drafted, primarily considers <br /> as contingencies evidence of impacts to the Feather River. Under Porter Cologne, 1 <br /> also need to consider the impaired beneficial uses of groundwater at the subject site. <br /> Specifically, 1 need to further evaluate long term, dilute Benzene and Ethanol(EtOH) <br /> in groundwater-as predicted with half-lives and as measured. Therefore, 1 request <br /> the following spreadsheets and plots: <br /> Response: RWQCB specific requests and responses are provided below. <br /> Imagine the result <br /> \\arcadis-us\officedata\folsom-ca\aproject\uprr\rc000738-uprr-storrie\deliverables\mna-implementation plan rtc\storne_mna-ip_rtc(4-26- <br /> 11).docx <br />