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<br /> Central Valley Regional Water Quality Control Board
<br /> Mr. Sam Brenneke 30 April 2013
<br /> Shell Oil Products US
<br /> 20945 South Wilmington Avenue
<br /> Carson, CA 90810
<br /> GROUNDWATER MONITORING REPORT— THIRD AND FOURTH QUARTERS 2012,
<br /> SHELL SACRAMENTO TERMINAL, 1509 SOUTH RIVER ROAD, WEST SACRAMENTO,
<br /> POLO COUNTY
<br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water
<br /> Board) staff reviewed the 31 January 2013 Groundwater Monitoring Report— Third and Fourth
<br /> Quarters 2012 (Report) submitted by Conestoga-Rovers and Associates (CRA) on behalf of
<br /> Shell Oil Products US (Shell) for the Shell Terminal at 1509 South River Road in West
<br /> Sacramento (Site). The Site has been an operating fuel storage and distribution facility since
<br /> the 1940s and consists of about.seven acres adjacent to the Sacramento River. Site structures
<br /> include 12 aboveground tanks (AGTs), office buildings, and warehouse buildings. Shell stores
<br /> unleaded gasoline, premium unleaded gasoline, ethanol, low sulfur diesel, and gasoline
<br /> additives at the Site.
<br /> The Report summarizes the September and November 2012 groundwater monitoring and
<br /> sampling events. In November 2012, Shell detected 0.03 foot of liquid phase hydrocarbons in
<br /> monitoring well MW-11 R. The maximum concentrations of total petroleum hydrocarbons as
<br /> diesel (TPHd), TPH as gasoline (TPHg), benzene, and methyl tert butyl ether (MTBE) were
<br /> 180,000 micrograms per liter (Ng/L), 120,000 pg/L, 940 pg/L, and 180 pg/L, respectively.
<br /> The Report shows that Shell used a silica gel cleanup procedure during analysis of TPHd.
<br /> Silica gel cleanup is a tool that is used to separate polar organics from normally non-polar
<br /> petroleum hydrocarbons in water samples. Shell may use silica gel cleanup for future sampling
<br /> events to demonstrate natural attenuation, but Monitoring and Reporting Program No.
<br /> R5-2004-0801 (MRP) requires the samples to be analyzed without silica gel cleanup. Board
<br /> staff is currently not recommending formal enforcement to its management for this violation of
<br /> the MRP, but may if you conduct future TPHd analysis solely with silica gel cleanup. If you have
<br /> any questions regarding this letter, you may contact me by phone at (916) 464-4819 or by email
<br /> at ks elton waterboards.ca. ov.
<br /> K I SHELTON, P.E.
<br /> Water Resources Control Engineer
<br /> cc: Ms. Adrienne Ellsaesser, San Joaquin County Environmental Health Department, Stockton
<br /> Mr. Mike Murphy, Conestoga-Rovers and Associates, Sonoma
<br /> Mr. Joe Neely, Conestoga-Rovers and Associates, Sonoma
<br /> Mr. Thomas Kosel, 76 Broadway, Sacramento
<br /> Ms. Rita Koehnen, Port of Stockton, Stockton
<br /> Mr. Miguel Torres, Shell OPUS, Stockton
<br /> Mr. Mark O'Brien, ERS, Walnut Creek
<br /> KARL E. LONOLEY SCD, P.E., CHAIP I PAMELA Q CREEDON F.E.. DQEE, EXECUTIVE OFFICEP
<br /> 11040 Sun Ganser Ihba 4200 Rancho Cordova.CA 95570 ; wwvj wararboards.ca gov/canrra1Va1'.y
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