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Jeff Goold - 2 - 31 January 2008 <br /> Shell Stockton Terminal 40 <br /> about 80 feet below ground surface. In order to fulfill the goal of vertical delineation in the <br /> SAs, the deepest groundwater sample from each SA must have a laboratory analytical <br /> result of non-detect. <br /> 3. Regional Water Board staff have observed that in a previous instance of CRA attempting <br /> to use Geoprobe's membrane interface probe (MIP) at a site underlain with clay soils, a <br /> malfunction of the MIP tool precluded the use of all data collected with this technology. The <br /> cause of the malfunction was either not determined or not explained in the report. We <br /> caution against Shell utilizing this technology to select the deepest samples and suggest <br /> use of a more reliable method for selecting soil and groundwater samples for plume <br /> delineation. <br /> The Addendum did not contain a time schedule, so by 16 February 2008, please submit a <br /> time schedule to conduct the work and submit an investigation report. If you have any <br /> questions regarding this letter, you may contact me at (916) 464-4811 or <br /> betaylor@waterboards ca.gov. <br /> BRIAN TAYLOF R.G. <br /> Engineering G6ologist <br /> cc: Mr. Jeff Gaardner, Conestoga-Rovers and Associates, Sonoma <br /> Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Jeffery D. Wingfield, Port of Stockton, Stockton <br /> Mr. Ron Orallo, Shell OPUS, Stockton <br /> Mr. Mark O'Brien, ERS, Walnut Creek <br /> Mr. Sean Coyle, SECOR International Incorporated, Rancho Cordova <br /> Ms. Shelby Lathrop, ConocoPhillips, Sacramento <br />