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Stockton Terminals Technical Ccoittee 3 • 30 May <br /> 2008 <br /> detections of TBA in remedial observation well AR/MW-18B shows that the STTC needs to <br /> calculate an historical average for this constituent, establish a list of"trigger" hydrocarbons <br /> including the historical average for TBA, and monitor this constituent to ensure that off-site <br /> migration is not occurring, Exceedence of the newly formulated historical average for TBA for <br /> three consecutive quarters will trigger implementation of the contingency plan. <br /> Regional Water Board staff have scheduled a meeting with the STTC and SECOR for <br /> 5 June 2008. We request that the STTC and SECOR be prepared to discuss, among other <br /> topics, amending the ozone injection monitoring program to include TBA, formulating a plan to <br /> resolve the OS system run-time problems, and addressing C and D zone contamination down <br /> gradient of the OS system. <br /> If you have any questi s regarding this letter, you may contact me at (916) 464-4811 or by <br /> email at betaylor@w erboards.ca.gov. <br /> BRIAN P.G. <br /> Engineering eologist <br /> cc: Mr. Mark Chandler, Time Oil Company, Seattle, WA <br /> Mr. Don Pratt, BP, San Ramon <br /> Mr. Gary Haeck, SECOR International,.Inc., Rancho Cordova <br /> Mr. Jeffrey Wingfield, Port of Stockton <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Mark O'Brien, Environmental Risk Services Corporation, Alamo <br /> Mr. Jeremy Hughes, Levine Fricke, Granite Bay <br /> Mr. Jerry Stauffer, .Valero LP, San Antonio, TX <br /> Ms. Amanda Spencer, Ash Creek Associates, Portland, OR <br />