Laserfiche WebLink
MAY 0 2 2013 <br /> Water Boards �/ M onL.F.R'TH.0 <br /> ENVRONMENTALHEMYH A Rorr lln, <br /> PE?PII,toER jICES <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 STOCKTON TERMINAL, 3515 NAVYDRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the 1 February 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 Stockton Terminal at 3515 Navy Drive in Stockton <br /> (Site). The Site has been an operating fuel storage and distribution facility since the 1940s and <br /> is located in an industrial area on Rough and Ready Island in Stockton. Shell currently receives <br /> fuel products via the Shell Pipeline Corporation and stores gasoline, diesel, and ethanol at the <br /> Site. <br /> The Report summarizes the September and December 2012 groundwater monitoring and <br /> sampling events. Shell did not detect liquid phase hydrocarbons in any of the monitoring wells <br /> during the second half of 2012. The maximum concentrations of total petroleum hydrocarbons <br /> as diesel (TPHd), TPH as gasoline (TPHg), benzene, and methyl tert butyl ether(MTBE) were <br /> 12,000 micrograms per liter (Ng/L), 27,000 pg/L, 8,100 pg/L, and 850 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 /> R5-2005-0810 (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 kss Iton waterboards.ca.aov. <br /> KRISTI 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 /> KAR_ E. LONOLET SCD, P.E., CHAIR I rXAld FLA Q GREED04 P.[_ EICE-E, EXECUTIVE orrICER <br /> 11020 Sun Centar Drive 4200,RanCnC Cordova,CA 95670 Vv..warerGoardx.va.ljn WCenhalvall9y <br /> ii ncc-urn nr,.n <br />