4.3. SR 10-18-1993 - Laserfiche WebLink

Home Browse Search

, . e 20-0W A: The lithologic log for this boring is of very poor quality. It is interpreted as SW from a depth of 40 feet to the base although grain size distribution information conflicts with this suggesting a till unit. 34-0W A: On Figure 9F the SM d~posit is interpreted as outwash. Grain-size information suggests that it is comprised of 45% silt and would be classified as till according to the criteria established in the Field Procedures Report. 17-0WA: The till unit begins at a considerably higher elevation than is shown on Figure 91 based upon the log, grain size information and the association with 26-0WA. 26-0W A: The till unit should occur at an elevation near to the surface, based upon the boring log and hydraulic conductivity data for the well. . 103-0WA: Interpretation of the upper till unit does not match between Figures 9E and 9L. The' lower till interpretation also shows a minor discrepancy of several feet. 106-0WA: According to the boring log and well construction diagram, this boring is only 70 feet deep. The interpretations for this boring must be shifted to. match the boring log and reflect a depth of 70 feet. The ground elevation may also be in error by approximately 1.7 feet. 211-0W A: . This well is shown to be 34 feet deep on Figure 9C while the log indicates that the boring was advanced only to 30 feet. e 40-0WA: The boring log and well construction diagram indicate that this well is 25 feet deep and screened from 15 to 25 feet. Table 3 suggests the well is 28 feet deep and screened from 16 to 26 feet. Figure 9M shows the well screen from 1 to 11 feet. An error is apparent in illustrating the well and boring. The correct ground surface elevation for this well should be 954.2 (NGVD) which is approximately 13.7 feet higher 'than shown on Figures 9H and 9M. Correct placement of the well screen shows the well situated in lean clay of low hydraulic conductivity as is evident on Table 9. Reinterpretation of the geology includes the SMIML unit within which P-40B is screened as till. The corrected interpretation correlates much better with adjacent boring 39-0W A.