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UPS . July 15, 1992 Job No. 074-013 ' Page 4 reference datum (assumed elevation + 100 feet) on Plate 2. The elevation data are presented below on Table I. The data indicate no differences in the elevations of the two targets nearest the excavation and slight differences in the elevations of the two ' targets furthest from the excavation; considering the distance of these targets from the excavation, the slight differences are likely the result of survey error. TABLE I ELEVATION MEASUREMENTS SETTLEMENT MONITORING ELEVATION (feet) TARGET' PRIOR TO FOLLOWING OV EREXCAVATION BACKFILL ' #1 105.94 105.93 . #2 105.87 105.86 #3 105.75 105.75 ' #4 105.96 105.96 NOTES: Refer to approximate plan locations on Plate 3. Reference datura assigned arbitrary elevation of + 100 feet; see Plate 3. 1 Soft, disturbed soil which remained in the excavation after tank removal was removed from the excavation and was placed on the existing waste-oil tank stocl<pile (see Stockpile C on Plate 4). Undisturbed native soil removed during overexcavation of the sidewalls and bottom was placed just northerly of the pre-existing stockpiles (see Stockpile D on Plate 4), About 50 cubic yards of soil was stockpiled during the subject work. The total volume of stockpiled soil from this and previous work by others appears to be about 310 cubic yards. The stockpiles were sampled from the 12 locations shown on Plate 4. At each location a sample was obtained by excavating about two feet into the stockpile with a shovel, and hand driving a clean brass tube into the moist material. Each sample ' was sealed, logged onto a chain-of-custody form and placed on ice as described above. Following sampling activities, the stockpiles were covered with a plastic membrane. ■Geotechnical ami I �a o�