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INTERIM REMEDIAL ACTION PLAN <br /> 4491 West Durham Ferry Road <br /> Tracy, CaW'ornia <br /> Delta Project No 40-91-732 <br /> Page S <br /> direction of ground water flaw an October 13 and 20, 1991, was calculated to be toward the east- <br /> northeast, the direction of ground water flow on April 9, and July 10, 1992, was calculated to be toward <br /> the north-northwest A ground water table contour map was generated using the water level <br /> measurements collected on July 10, 1992, and is presented in Figure 3 <br /> TABLE x <br /> GROUND WATER ELEVATION DATA <br /> Date Elevation of Depth to Ground Water <br /> Monitoring Well Measured Ton of Caste Ground Water ft Elevation (ft)a <br /> MW-1 09/04/91 9844 946 88 98 <br /> 10/13/91 1081 8763 <br /> 10/20/91 11 15 8729 <br /> 04/09/92 1493 83 53b <br /> 07/10/92 12 88 8556 <br /> MW-2 09/04/91 9904 1012 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 8571 <br /> MW-3 09/04/91 9793 8 67 8926 <br /> ' 10/13/91 1010 87 83 <br /> 10/20/91 1062 8731 <br /> 04/09/92 1435 83 58 <br /> ' 07/10/92 1236 85 57 <br /> a Relative to an assumed elevation of 100 feet <br /> b Ground water elevation adjusted due to presence of 0 03 foot of liquid-phase petroleum hydrocarbons <br /> 3.5 Soil Chemistry <br /> Apparently, soil samples collected from beneath each underground storage tank In February 1988 <br /> contained petroleum hydrocarbons at concentrations requiring remediation Delta has not received copies <br /> ' of the chemical analyses reports <br /> RPT045 TA <br />