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as they vary with time, everywhere in the simulated subsurface <br /> system. SUTRA flow simu7lations may be employed for areal and <br /> cross-sectional modeling of - saturated groundwater flow systems, <br /> and for cross-sectional modeling of unsaturated zone flow. <br /> Solute transport simulations using SUTRA may be employed to <br /> model natural or man-induced chemical species transport including <br /> processes of solute sorption, production and decay, and may <br /> be applied to analyze groundwater contaminant transport problems <br /> and aquifer restoration design. Solute transport simulation <br /> with SUTRA may be used for modeling of variable density leachate <br /> movement. <br /> Mesh construction is quite flexible for arbitrary geometries <br /> employing quadrilateral finite elements in Cartesian or <br /> cylindrical coordinate systems. SUTRA may be employed in one <br /> or two dimensional analyses. Flow and transport simulation <br /> may be either steady-state—which requires only a single <br /> solution step, or transient. . .which requires a series of time <br /> steps in the numerical solution. <br /> SUTRA may be relied upon to provide clear, accurate answers <br /> to well-posed, well-defined, and well-discretized simulation <br /> problems. In less well defined systems, SUTRA simulation can <br /> help visualize a conceptual model of the flow and transport <br /> regime, can aid in deciding between various conceptual models, <br /> and is useful for hypothesis testing. <br /> SUTRA is cost effective and, by employing a model, one may avoid <br /> the significant problems that would likely be encountered when <br /> attempting to bore or exoavate in the public roadways that abut <br /> the northern and western boundaries of the site ( i .e. Grantline <br /> Road and East Road) . <br /> If PHS/EHD finds the course of action proposed acceptable, the <br /> Pestana Trust has authorized EPM Technologies, Inc. of Modesto <br /> (EPM) to perform the tasks described. EPM is a full service <br /> environmental consulting firm associated with JL Analytical <br /> Services, Inc. of Modesto, a California-state certified <br /> hazardous waste analytical laboratory. <br /> The feasibility study and modeling will be performed by qualified <br /> professional staff under the direction of a Registered Civil <br /> Engineer or Registered Geologist. A report of findings will <br /> be prepared and submitted within 30 days following completion <br /> of field activities. If -the findings confirm that alternative <br /> technologies may be used to remediate the site, a formal workplan <br /> will be prepared for submission to your office and the Central <br /> Valley Regional Water Quality Control Board (CVRWQCB) within <br /> 30 days of the client ' s receipt of your approval to proceed. <br /> 2 . <br />