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y/ <br /> 0r:Nft,4.�Ao <br /> _ EOMVND B. Bn°wx Je. <br /> ':a� o.exnox <br /> MAnxcw Rooaloucz <br /> d!V Rl <br /> Water Boards `/ !xAMENTAL°no<.°H°° <br /> Central Valley Regional Water Quality Control Board <br /> RECEIVED <br /> 25 January 2017 JAN 2 1 2011 <br /> &MRONMENfAL HEALTH <br /> Mr. Mike Makerov, P.G. pEwT/3ffR1 rX2 <br /> Manager Environmental Remediation <br /> BNSF Railway <br /> 740 E. Carnegie Drive <br /> San Bernardino, CA 92408-3571 <br /> CONDITIONAL CONCURRENCE WITH HIGH RESOLUTION SITE CHARACTERIZATION <br /> WORK PLAN, BNSF RAILWAY COMPANY MORMON YARD, 801 DIAMOND STREET, SAN <br /> JOAQUIN COUNTY <br /> Burlington Northern Santa Fe Railway (BNSF) identified groundwater containing diesel <br /> pollutants beneath the location of a 2011 fuel release at its Mormon Yard in Stockton. The soil <br /> samples suggested that the groundwater pollutants were unrelated to the fuel release, and in a <br /> 25 November 2015 letter, Central Valley Water Board staff requested BNSF demonstrate that <br /> the fuel concentrations are decreasing. In a 6 January 2016 meeting, Central Valley Water <br /> Board additionally requested that BNSF conduct a groundwater investigation to ascertain if the <br /> diesel detections in groundwater represent an unidentified or continuing release of diesel. In <br /> response, BNSF provided the 31 March 2016 High Resolution Site Characterization Work Plan <br /> (Work Plan) prepared by Kennedy Jenks Consultants. <br /> In the Work Plan, BNSF presents documentation of underground fuel tanks removed in 1990 <br /> and subsequent excavations of fuel-contaminated soil. Among the findings presented is a <br /> subsurface waste oil transfer pipe that failed an integrity test. BNSF proposes to evaluate these <br /> potential sources of pollution by using laser induced flourescence (LIF) to semi-quantitatively <br /> observe petroleum in the subsurface. In this case, the LIF technology emits an ultra-violet <br /> wavelength that excites petroleum particles which emit a longer wavelength when they return to <br /> a normal state. The wavelength emitted is recorded and provides an image representing <br /> petroleum presence with depth in the borehole. The LIF is advanced in boreholes with a cone <br /> penetrometer rig which also records soil types. <br /> BNSF proposes four transects of LIF boreholes, with about 15 borings advanced to about 50 <br /> feet. Each boring will result in a continuous sequence of wavelength readings. The first two <br /> transects are proposed along the waste oil transfer pipe and along the length of the 1995 soil <br /> excavations. The last two transects are upgradient and downgradient of the first two, and the <br /> location of the borings will be informed by the results of the first two transects of LIF readings. <br /> Please transmit a figure with the proposed locations of the final two transects to Central Valley <br /> Water Board staff for concurrence prior to proceeding with them. <br /> In an 18 January 2017 telephone conversation with staff of BNSF, Central Valley Water Board <br /> and Ms.Laura Kennedy of Kennedy/Jenks Associates, Ms. Kennedy suggested that the work <br /> could commence in March, weather permitting, and a report of results could be provided about <br /> KARL E. LONGLEY SCD, P.E.,CHAIR I PAMELA C. CREEDON P.E., $CEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive x200,Rancho Cordova,CA 95670 1 www.waterboarCs.ca.gOV/cantraivalley <br /> �^j xecvc«o raxex <br />