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EDMUND El. BROWN JR. <br />GOVERNOR <br />C•LIPORNI• <br />Water Boards <br />MATTHWW RODRIOUGZ <br />SECRETARY FOR <br />ENVIRONMENTAL PROTECTION <br />Central Valley Regional Water Quality Control Board <br />5 July 2018 <br />Mr. Mike Makerov, P.G. <br />Manager Environmental Remediation <br />BNSF Railway <br />740 E. Carnegie Drive <br />San Bernardino, CA 92408-3571 <br />CONDITIONAL CONCURRENCE WITH ADDITIONAL SOIL AND GROUNDWATER <br />SAMPLING WORK PLAN, BNSF RAILWAY COMPANY MORMON YARD, 801 DIAMOND <br />STREET, SAN JOAQUIN COUNTY <br />California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br />Board) staff reviewed the 25 April 2018 Additional Soil and Groundwater Sampling Work Plan <br />(Work Plan) prepared by Kenndy/Jenks Consultants for the Burlington Northern Santa Fe <br />(BNSF) Mormon Yard in Stockton. <br />Background <br />In 2011, a locomotive fuel tank was ruptured in the Mormon Yard, soil was excavated, but <br />confirmation samples contained sufficient amounts of petroleum hydrocarbons that the Central <br />Valley Water Board requested additional assessment. In August 2015, BNSF reported that <br />groundwater contained diesel fuel, but demonstrated that the source was unlikely to have been <br />the ruptured locomotive fuel tank. In March 2016, BNSF reported results of a Laser-Induced <br />Fiourescence (LIF) survey that indicated light non-aqueous phase liquid (LNAPL) in one of the <br />borings (LIF #4). This boring is slightly downgradient of a 26,000-gallon underground diesel fuel <br />tank that was removed in 1991. <br />Additional Sampling Proposed <br />In the Work Plan, BNSF proposes two borings: one at the location of the removed fuel tank; and <br />one at the location of LIF #4. Soil samples in each boring will be obtained at intervals not <br />greater than five feet apart. If hydrocarbons are observed, then this sample, as well as discrete <br />soil samples from above and below the observation, will be analyzed in order to bracket the <br />observation in the vertical plane. A soil sample will be also be obtained just above first <br />groundwater. If, however, no hydrocarbons are observed, then one discrete sample will be <br />obtained just above first groundwater. Groundwater samples will be obtained from both borings. <br />All samples are proposed to be analyzed for total petroleum hydrocarbons as diesel (TPHd) with <br />silica gel preparation. BNSF should also analyze these samples for TPHd without silica gel <br />cleanup. The LIF response from LIF #4 did not suggest a typical fuel signature, therefore <br />Central Valley Water Board staff also request that soil and groundwater samples be analyzed <br />for volatile organic compounds by EPA Method 8260B. <br />KARL E. LONGLEY ScD, P.E., CHAIR I PATRICK PULUPA, ESO., EXECUTIVE OFFICER <br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 I www.waterboards.ca.govicantralvailay <br />.5 RECYCLED PAPER