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1 � <br /> L yx <br /> k _ <br /> v4 <br /> AGS 87031-2 <br /> USA Station No. 110 <br /> Stockton, California <br /> s- <br /> EVALUATION OF GROUND WATER GRADIENT.' <br /> An evaluation of the ground-water gradient across the site was <br /> made through the use of an automatic leveling instrument. The <br /> instrument was used to measure the differences in elevation <br /> between the instrument and the top of the casing for each of the <br /> monitoring wells on August 25, 1987. The elevation differences <br /> were combined with measurements of the static water levels made <br /> on September 17, 1987 with an electronic water level indicator to <br /> calculate the water level elevation differences between the wells <br /> (Table 4) . <br /> TABLE 4 <br /> GROUND WATER ELEVATION DIFFERENCES <br /> MONI'T'ORING WELLS <br /> U.S.A. STATION NO. 110 <br /> STATIC WATER LEVEL <br /> MONITORING TOp OF CASING WATER BELOW ABOVE <br /> WELL (FEET ABOVE DATUM) LEVEL* DATUM MW-1 <br /> NUMaER <br /> Water level measurements made on Sept <br /> eex 17, 1987. <br /> 49.62'# 48.84 .22 <br /> S-1 0.780 48.62 48.62 0.00 <br /> MW-1 0.000 49.4348.81 .0.19 <br /> MW-2 0.620 <br /> Measurements in feetof casing <br /> * Static water level measured in <br /> feet <br /> top °ecasingpfor MW-1 <br /> Datum is elevation corresponding <br /> # Corrected for floating ponding <br /> 14 <br /> ,Qppfied <br /> Geosystems <br />