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Mr. Jeff Baker - 5 - 11 March 2010 <br /> Stockton Terminals Technical Committee <br /> 4. BP failed to over-purge two on-site wells, AR/MW-1 C and AR/MW-22A, that <br /> contained MBAS in concentrations exceeding 500 pg/L. To comply with the interim <br /> remediation plan, BP must conduct over-purging in all on-site wells with MBAS <br /> exceeding 500 pg/L. <br /> 5. At its current rate of increase, the TBA concentrations in AR/MW-18B could <br /> potentially reach the compliance limit of 66 pg/L sometime between late 2010 and <br /> early 2011. Since three consecutive exceedences of this concentration would trigger <br /> installation of a second ozone sparge array east of the RO wells, BP should begin <br /> mapping this contaminant plume to more closely scrutinize its rate of migration and <br /> to formulate a plan to address this potential problem. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4811 <br /> or by email at betaylor@waterboards.ca.gov. <br /> ------------ <br /> -, � <br /> BRIAN TAYLOR, P.G". <br /> Engineering Geologist <br /> cc: Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, <br /> Stockton <br /> Mr. Jeffrey Wingfield, Port of Stockton <br /> Mr. Mark Chandler, Time Oil Company, Seattle, WA <br /> Mr. Paul Supple, BP, San Ramon <br /> Mr. Gary Haeck, Stantec Consulting Corporation., Rancho Cordova <br /> Mr. Mark O'Brien, Environmental Risk Services Corporation, Alamo <br /> Mr. Jeremy Hughes, LFR Inc., Granite Bay <br /> Mr. Joe Aldridge, NuStar, San Antonio, TX <br /> Ms. Amanda Spencer, Ash Creek Associates, Portland, OR <br />