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4 CVhATER <br /> LEAR <br /> t <br /> G R ' O .U` T, I N -C. <br /> • The extremely. low ''concentzations of .02. rn'easured in, vapor extraction. a`nd'. <br /> monitoring wells ':near. the former-tanks indicate that the.amount of vacuum <br /> applied during the:initial portion (first '4-,8 hours).will be low:' Measurements <br /> - taken in wehs.oiztsde the "contaminated` zone.indicate that-02 is available,in the <br /> subsurface, and. will move,.towards the extraction well-Oven time: This .vapor~ <br /> exchange will be enhanced by the t movement' of atmospheric air to the <br /> •subsurface, as the lot'is not paved. j <br /> It.Will be necessar however, to allow the vapor extraction-equipment to operate, <br /> Y, <br /> for several.days; in order to-optimize:this air exchange: <br /> Given theti concentrations::of"hydrocarbons..measured in the subsurface," and;:the <br /> demonstrated -lack' of t`ransmissivity,, it is -`cruciai`that rigorous. testing precede: <br /> remedial trade-off analyses. I.believe thaf the test as planned,will provide the most <br /> comprehensive data set possible for.future remedial alternative.evaluation. <br /> Please give'me a call after you have hada chance to review this information:,' I "look <br /> forward"to speaking,with:you'again.soon. , <br /> Regards, .. <br /> learwater,Group,. Inc <br /> Mark s B.-Niebanck; R. G: ; <br /> Operations Manager. <br /> cc. Ms: Brooke :Birkie, Ne'umiller.&•-Beardslee. - m <br />