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Mr. Verma -4- 3 October 1994 <br /> sampling plan and the final report must be certified by aft i'appropriately-qualified geologist or <br /> engineer registered in the State of California. <br /> To summarize, we require the following minimum sampling program: <br /> 1. Two samples, one each from cells 14 and 20, to be analyzed for BTXE, TPH-d, and <br /> TOG. FID must be used, and you must demonstrate that no soluble components are <br /> present. For BTXE, grab samples must be used. You use composited samples for <br /> the other analyses. (This will mean an additional two samples for compositing, <br /> however). <br /> 2. A minimum of 7 samples from cells 1, 7, and 19, using a grid system applied to each <br /> cell individually. These samples shall be analyzed for all the constituents of concern, <br /> using the sampling, preparation, and analytical methods discussed above. The <br /> analyses must show how much of the heavy constituents are attributable to diesel. <br /> 3. A minimum of 4 samples from cells 8 and 9, using the locations proposed by our <br /> consultants (or you may substitute gridding each cell individually). The samples shall <br /> be analyzed as summarized above, omitting TOG. We may ask for TOG or another <br /> analysis if the results show a significant heavy fraction beyond diesel. <br /> 4. Do not mix, stockpile, or composite soils between cells before analysis. <br /> We will be happy to discuss the reasoning behind these comments in further detail with you or your <br /> consultants. <br /> If you have any questions, please call me at (916) 255-3119. <br /> /x1-1?ie <br /> GAIL WIGGETT <br /> Associate Engineering Geologist <br /> GJW:gw <br /> cc: Ed Padilla, San Joaquin County Public Health Department, Stockton <br /> John Lynch, Wright Environmental <br /> Robert Evans, RWQCB <br />