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i APPENDIX C CORRECTIONS TO FIGURE 4 OF WHF ENVIRONMENTAL'S MONITORING WELL INSTALLATION REPORT November 24, 1992 WHF Environmental prepared a Monitoring Well Installation Report on November 24 , 1992 . Figure 4 of this report was a cross section through the former dispenser island in the northwestern corner of the property. The section incorporated data from exploration trenching performed in February 1991, along with new data from the installation of monitoring well MW-4 . The data from February 1991 had originally been reported in the March 16, 1991 Site Assessment/Remedial Recommendations report and revised slightly in the April 2 , 1992 Phase II -- Remedial Investigation Results Addendum report. Figure 4 of the November 1992 report was used as the basis for ' concluding that residual soil contamination is present in the northwestern part of the site, and in locating soil borings B17 and B18 to investigate this contamination in August, 1993 . During subsequent report preparation, GeoAudit discovered several r inconsistencies between Figure 4 of the November 1992 report and the March 16, 1991 and April 2 , 1992 WHF reports with regard to the location of borings and soil samples. Therefore, in revising Figure ' 4 and presenting it as Figure 3 for the Third Quarter Report of 1993 , these errors have been corrected to agree with the locations as presented in the original (March 1991 and April 1992) reports. 1) Sample 13D-18 ' should be located at a depth of 18 feet, or 8 feet directly beneath sample 13D-101 . In Figure 4 , it was located at a depth of 14 feet, 5 feet north of 13D-101 . 2) Samples 13D-10 ' and 13D-18 ' should have been located 20 feet south of sample 13C-17 . 51 . In Figure 4, 13D-18 ' is located 10 feet south of 13C-17 . 5 ' and 13D-10 ' is located 15 feet south of 130--17 . 51 . (See Figure 4 of WHF' s April 1, 1992 report) . ' 3) MW-4 , which is located approximately 4 feet east of the line of cross section, should be projected into the section at a point 19 feet north of sample 13C-17.51 . In Figure 4, it was projected in 26 feet north of 13C-17. 51 . This location would be 7 feet beyond the property line, in the sidewalk. 4) In addition, the locations of borings 8B, 13A, and 13B are also included in the revised figure, to help clarify the boundaries of the plume of contaminated soil in the excavation.