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i <br /> sampling, to be performed in December, a blind replicate sample <br /> will be taken in order to help confirm this. Dedicated bailers <br /> will also be utilized. If the sampling confirms sampling or <br /> laboratory error, the quarterly sampling program will continue. <br /> if it appears that the plume has migrated, significantly, a <br /> treatment program will be proposed. <br /> In you July 27, 1989 correspondence, several questions were asked <br /> about the project. The following comments address those <br /> questions: <br /> 1. Question: Submit the lab results from soil samples <br /> taken during re-excavation and aeration of soils from <br /> tank pit 1. <br /> Response: Lab reports are presented as Attachment 2. <br /> 2. Question: Illustrate the location and depth samples <br /> were taken from the tank pit for March 23, 1989; provide <br /> top view and cross sectional diagrams. <br /> Response: Figura 3 illustrates the former tank pit from <br /> a top and cross-sectional view. The lab reports from <br /> the sampling of the pit are presented as Attachment 3. <br /> Question: Provide evidence for review by this office to <br /> support lead levels are background levels. <br /> : The soils and groundwater were sampled for <br /> total lead not organic lead. The concentrations ranged <br /> from 3.5 co 7.7 ppm in the soil and non-detected to 30 <br /> ppb in the water. wells MWi, MW2 and KW3 have never <br /> reported,hydrocarbons in,the:"soils o:^ water. T d <br /> levelsr`tt�eratoire�iihoul�F� �a 6kgroand. The lead e've' f s <br /> in'' MW4 correlates•wfth = Iie non-contaminated wells. This <br /> indicates that the levels in MW4 are also at background. <br /> 4. Question: Provide information supporting the <br /> elimination of the source of oil and grease <br /> contamination in MW1. <br /> Response: This well was in-malled in a low lying area <br /> that ponds during precipitation events. The well was <br /> adjacent to a vehicle maintenance area which was <br /> subjected to occasional spillage of motor oil and other <br /> lubricants. The well was extended to allow for <br /> monitoring/sampling during the rainy season, without the <br /> need to remove surface water. The extension was <br /> subsequently broken and surface run off was allowed to <br /> enter the well. The box was removed and replaced with a <br /> water proof well box along with a water proof sewer plug <br /> well cap. This should eliminate the source of the oil <br /> and grease contamination. <br />