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California 'gional Water Quality Con l Board <br /> Central Valley Region <br /> Karl E. Longley,SCD,P.E.,Chair. <br /> Linda S.AdamsArnold <br /> Secretaryjor 11020 Sun Center Drive#200,Rancho Cordova,California 956706114 Schwarzenegger <br /> Environmental Phone(916)464-3291 •FAX(916)4644645 Governor <br /> Noiection htip://www waterbouds.ca.gov/centralvalley <br /> 15 July 2009 REEVED <br /> JUL 17 2009 <br /> Ms. Carol Campagna <br /> Shell Oil Products US ENVIRONMENT HEALTH <br /> 20945 South Wilmington Avenue pERMITISERVICE3 <br /> Carson, CA 90810 <br /> RESPONSE TO BACKGROUND STUDY WORK PLAN, SHELL STOCKTON TERMINAL, <br /> 3515 NAVY DRIVE, STOCKTON, SAN JOAQUIN COUNTY <br /> Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) <br /> staff reviewed the 6 July 2009 Response to RWQCB Review of April 30, 2009 Work Plan to <br /> Monitor Baseline Concentrations and Response to Infiltration Study Work Plan (Response) <br /> submitted by Conestoga-Rovers and Associates (CRA) on behalf of Shell Oil Products US <br /> (Shell) for the Shell Stockton Terminal at 3515 Navy Drive in Stockton (Site). <br /> Central Valley Water Board staff requested the Response in our 10 June 2009 letter which <br /> asked Shell to submit a proposed statistical data analytical method before implementing the <br /> background study, and a list of constituents that will require updating to calculate background <br /> conditions. <br /> The Response proposes to decrease the list of wells in which the background study will be <br /> conducted from seven (MW-25, MW-26, MW-13R, MW-20, MW-39, MW-19 and MW-31) to <br /> four (MW-19, MW-25, MW-26, and MW-31), and to conduct quarterly sampling and use the <br /> USEPA's ProUCL 4.00.04 spreadsheet to calculate background values of a selection of <br /> general groundwater parameters, minerals and dissolved lead. <br /> We concur with the list of analytes and the statistical methodology proposed for the <br /> background study. If have any questions regarding this letter, you may contact me at <br /> (916) 464-4811 or aylor@waterboards.ca.gov. <br /> BRIAN TA OR, R.G. <br /> Engineeri g Geologist <br /> cc: Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Jeff Gaardner, Conestoga-Rovers and Associates, Sonoma <br /> Mr. Jeffery D. Wingfield, Port of Stockton, Stockton <br /> Mr. Ron Orallo, Shell OPUS, Stockton <br /> Mr. Mark O'Brien, ERS, Alamo <br /> Mr. Sean Coyle, Stantec Consulting Corp., Rancho Cordova <br /> Ms. Shelby Lathrop, ConocoPhillips, Sacramento <br /> California Environmental Protection Agency <br /> pia Recycled Paper <br />