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UAItTERLY GROUND WATER MONITORING REPORT <br /> Second Quarter of 1992 <br /> 4491 West Durham Ferry Road <br /> Delta Project No 40-91-732 <br /> Page 3 <br /> 3.0 RESULTS <br /> 3.1 Ground Water Elevation Data <br /> Depth to ground water measurements were collected on July 10, 1992, from monitoring wells MW-1, <br /> MW-2 and MW-3 Ground water table elevations are summarized in Table 1 A water table contour <br /> ' map (Figure 3) was generated from,ground water elevation data collected on July 10, 1992 The inferred <br /> ground water flow direction was toward the north-northwest at a hydraulic gradient of approximately <br /> 0 002 Water table contour maps generated in the past indicate groundwater flow directions to have been <br /> toward the west-southwest on September 4, 1991, toward the northwest on October 13 and 20, 1991, and <br /> toward the north-northwest on April 9, 1992 The Water Table Contour Map generated from water levels <br /> ' collected on April 9, 1992, and presented in DeIta's Quarterly Ground Water Monitoring <br /> Report for the first quarter of 1992 dated May 20, 1992, was in error The error occurred in the top <br /> of casing elevation for monitoring well MW-3 The top of casing elevation for monitoring well MW-3 <br /> is 97 93 not 97 43 as reported Figure 4 was generated to reflect the corrected ground water flow <br /> direction <br /> 1 R21 <br /> aGrounG Water Zlevataon Data <br /> ' Date Elevation of Depth to Ground Water <br /> Monitoring Well Measured Top of Casme Ground Water (ft) Elevation (ft)', <br /> ' MW-1 09/04/91 9944 946 8898 <br /> 10/13/91 1081 8763 <br /> ' 10/20/91 11 15 8729 <br /> 04/09/92 1493 83 53* <br /> 07/10/92 1288 8556 <br /> MW-2 09/04/91 9904 10 12 8892 <br /> 10/13/91 1122 87 82 <br /> 10/20/91 11 65 87 39 <br /> ' 04/09/92 1529 83 75 <br /> 07/10/92 13 33 85 71 <br /> MRPT029 TA <br />