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Ms Renee Robinson, NuStar - 2 - 3 June 2014 <br /> NuStar Terminals Stockton Terminal <br /> 2. The Report states that the groundwater data show generally stable or decreasing <br /> concentrations. NuStar concludes the slight increases in concentrations in ST/MW-1 <br /> and PS/MW-14 are typical of historical fluctuations associated with seasonal <br /> groundwater levels. Central Valley Water Board staff is concerned with the recent <br /> increases in these monitoring wells. The February 2014 TPHd concentration in PS/MW- <br /> 14, 27,000 pg/I, is the second greatest concentration ever reported in that well (the <br /> greatest concentration was 28,000 pg/L in February 2012). In addition, PS/P-12 <br /> (downgradient of PS/MW-14) contains the first detections of TPHd since 2010 at 4,000 <br /> pg/L. These wells are along the eastern border of the tank farm and NuStar needs to <br /> continue to monitor and evaluate these concentration trends. <br /> In summary, NuStar needs to include the data from the adjacent Sites on the isoconcentration <br /> contours included in the semiannual reports. In addition, NuStar needs to monitor the <br /> increasing concentrations along the eastern boundary of the tank farm. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4819 or by <br /> ,email at kshelton(a�waterboards.ca.gov. <br /> - 6/�� <br /> KRISTI SHELTON, P.E. <br /> Water Resources Control Engineer <br /> cc: Ms. Adrienne Ellsaesser, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Jeffrey Wingfield, Port of Stockton <br /> Mr. Mark Chandler, Time Oil Company, Seattle, WA <br /> Mr. Robert Truedinger, Kinder Morgan Energy Partners, Richmond <br /> Mr. Todd Brown, Stantec Consulting Corporation, Rancho Cordova <br /> Mr. Mark O'Brien, Environmental Risk Services Corporation, Alamo <br /> Ms. Danielle Caitlin-Wright, Arcadis, Roseville <br /> Mr. Mike Whitson, APEX, Portland, OR <br />