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ARCADIS Design & Consultancy <br />for natural and <br />built assets <br /> <br />Mr. Jeff Tierney <br />Central Valley Regional Water Quality Control Board <br />11020 Sun Center Dr <br />Rancho Cordova, CA 95670 <br />Subject: <br />Incident Response Summary Report <br />Union Pacific Railroad <br />Stockton, CA — July 22, 2020 Locomotive Diesel Release <br />Dear Mr. Tierney: <br />Arcadis U.S., Inc. (Arcadis) has prepared this Incident Response Summary <br />Report (Report) on behalf of Union Pacific Railroad (UPRR) associated with an <br />incident response to cleanup diesel fuel released at Track PN002-9-806 on July <br />22, 2020 at the Port of Stockton in Stockton, California (Site; Figure 1 and <br />Figure 2). This Report has been prepared as requested by the Central Valley <br />Regional Water Quality Control Board (RWQCB) in the email to Arcadis dated <br />July 31, 2020. <br />BACKGROUND <br />According to UPRR, on July 22, 2020 red-dye diesel fuel was released from an <br />overflow pipe on Locomotive UP 9923 onto Track PN002-9-806 at the Central <br />California Traction Company (CCT) rail facility. An approximately 44 by 11-foot <br />area of petroleum hydrocarbon staining was observed on the ground adjacent to <br />the rail (Figure 2). <br />The release was reported to the UPRR Response Management Communication <br />Center (RMCC), which notified local and state regulatory agencies. The San <br />Joaquin County Environmental Health Department (SJCEHD) responded to the <br />notification as the regulatory oversight during the cleanup. UPRR, Patriot <br />Environmental Services, Inc. (Patriot), Jim Dobbas, Inc. (Dobbas), CCT, and <br />Arcadis mobilized to the Site to respond to the incident. <br />2020.09.02_Stktn_20.07.22_Loc Ds1 Ris_Sum Rpt_Draft <br />Arcadis U.S., Inc. <br />101 Creekside Ridge Court <br />Suite 200 <br />Roseville <br />California 95678 <br />Tel 916 786 0320 <br />Fax 916 786 0366 <br />www.arcadis.com <br />ENVIRONMENT <br />Date: <br />September 2, 2020 <br />Contact: <br />Brittani Jacobsen <br />Phone: <br />916 865 3145 <br />Email: <br />Brittani.Jacobsen@arcadis.com <br />Our ref: <br />30057786 <br />Page: <br />1/10