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California Api6al Water Quality 4&19rol Board <br /> Central Valley Region <br /> Terry Tamminen Robert Schneider,Chair Arnold Schwarzenegger <br /> Secretary for 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Governor <br /> Environmental (916)464-3291 •Fax(916)464-4797 <br /> Protection http://www.swreb.ca.gov/rwgcb5 <br /> G �C��[1,���� c� <br /> 9 August 2004 AUG 1 0 2004 <br /> ENVIRONMENT HEALTH <br /> Mr. James A. Levy, Manager PERMIT/SERVICES <br /> Environmental Site Remediation <br /> Union Pacific Railroad Company <br /> 9451 Atkinson Street, Suite 100 <br /> Roseville, CA 95747 <br /> SPILL RESPONSE REPORT, UNION PACIFIC RAILROAD COMPANY, STOCKTON YARD, <br /> SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Board) has reviewed the <br /> 1 March 2004 Spill Response Report (Report) for the petroleum hydrocarbon spill at the Union Pacific <br /> Railroad Company's (UPRR) yard in Stockton. The Report provides the results of remedial actions that <br /> UPRR took to clean up diesel fuel (TPHd) spilled when locomotives collided on 30 August 2003. <br /> The collision spilled about 2,300 gallons of TPHd, which contaminated soil in the yard and flowed into <br /> surface water via a drop inlet and corrugated metal pipe culvert (CMP). UPRR conducted an emergency <br /> cleanup of the surface water, and in November 2003, excavated contaminated ballast and about 315 <br /> cubic yards of soil to a maximum depth of about nine feet below ground surface (bgs). UPRR plugged <br /> the CMP to prevent any further discharge of surface water containing TPHd and pressure washed the <br /> culvert, vacuuming the discharge water out of the drop inlet for treatment at the site's industrial <br /> wastewater treatment plant. UPRR continued to vacuum and monitor storm water from the drop inlet <br /> from November 2003 to March 2004. UPRR did not sample groundwater or report its depth,but it is <br /> expected to be at least 40 feet bgs. <br /> Eleven confirmation samples taken from the bottom and sidewalls of the excavation contained TPHd. <br /> Six of the samples contained less than 10 mg/kg, one contained 48 mg/kg, and the others contained 150 <br /> mg/kg, 220 mg/kg and 230 mg/kg TPHd. The lab reported that two of the low concentration samples <br /> contained a petroleum hydrocarbon that did not match the lab standard for diesel. <br /> Seven water samples were taken from the drop inlet after storm events. The water removed from the <br /> inlet contained 4,900 ug/l of TPHd in November 2003 and declined to 500 ug/l in March 2004. The lab <br /> reported that all of the samples contained petroleum hydrocarbons that did not match the lab standard for <br /> diesel. <br /> Regional Board staff believes that based on the amount of TPHd in the soil confirmation samples and <br /> the depth to groundwater, UPRR excavated adequate soil to protect groundwater from the <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br />