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observe it in the subsurface. When cement dries, it expels water, perhaps this <br /> was some water that had been expelled from the grout Imix. <br /> We feel strongly that 4D and 4S are hydraulically isolated from each other <br /> gY Y l y II <br /> because, during the 12 hour pump test, 4S drew downy 0.2 feet in even spaced <br /> increments over 12 hours. Well 4D fluctuated on 0.04 feet during the same <br /> interval. <br /> Well 4S was developed by the drillers immediately after completion. About <br /> 300 gallons of water was pumped from the well with a bladder pump and <br /> containerized at the site. The final water, which was pumped, was clear after <br /> the well was developed. The well transmits water properly. Since the well was <br /> developed by the drillers, shortly after completion, electroconductivity, pH and <br /> temperature measurements were not taken when the well was developed. They <br /> have been taken regularly during each sampling round, though, and show <br /> nothing unusual. <br /> This well has a calculated transmissibility of 5,780 gpd/foot, based on a 12 hour <br /> pump test analysis. The transmissibility of this well makes it the second fastest <br /> well at the site. It is hard to imagine that it would no , be working properly, or <br /> that cement has clogged the formation surrounding it. <br /> Item 2: <br /> The water line shown in Plates 4 and 7 previously supplied water to the small <br /> building that was over the now excavated area. The pipe was removed during <br /> the re-excavation process, and no concrete was associated with the pipe. <br /> Item <br /> We have enclosed a summary page of soil samples taken at the time that the <br /> wells were drilled. There is no indication that soils were "saturated" with <br /> gasoline. The table enclosed is from our "Report of Findings" dated June 14, <br /> 1990. q <br /> The soils encountered at 15 to 16.5 feet in MW-4S and.in 4D were described in <br /> the log as being saturated with gasoline. However, the soils samples tested at <br /> the laboratory showed 30 and 61 ppm TPH gasoline respectively, for 16 to <br /> 16.5 feet in each of these holes. If the soils were saturated with gasoline, they <br /> would most likely have higher lab results. We really do not know just why <br /> MW-4S does not show .ground water contamination. t has been about a year <br /> (May, '90) since contamination was detected in this well. Perhaps it cleaned up <br /> when the well was developed. I # <br /> I <br /> I <br /> I� <br /> J <br />