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■VZ1 INC <br /> except monitoring well MW-1 Only monitoring well MW-1 contains petroleum hydrocarbon <br /> constituents at concentrations that are above analytical method detection limits <br /> 76 Groundwater Gradient <br /> The groundwater surface gradient at the site was first calculated from measurements made <br /> on June 2, 1989 The estimated gradient was determined to be approximately 0 025 foot <br /> per feet (ft/ft) to the southwest Basic data for the depth to groundwater surface <br /> measurements are presented in Tables 5 and 6 and within the graphs presented in <br /> Appendix VI <br /> The groundwater surface has been contoured for each of the monitoring events The maps <br /> of the groundwater surface for each monitoring event are presented in Appendix VIII <br /> Exhibit 10 depicts a summary of groundwater surface gradients for each of the monitoring <br /> events The gradient for the groundwater surface generally slopes to the southeast (S 45 <br /> E) but has varied in direction as significant as to the southwest (S 50 W) The gradient <br /> direction has also been contoured essentially as a mound surface with flow in no <br /> preferential direction for approximately one-third of the monitoring events <br /> The site gradient direction is roughly coincident with regional groundwater gradient and flow <br /> direction determined from San Joaquin County Department of Public Works and as <br /> depicted on Exhibit 11 <br /> 19150011 005 29 <br />