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f.� <br /> Determination of the Direction of Groundwater Flow ' <br /> and <br /> Flow Rate <br /> at .the <br /> Pestana TrustProperty <br /> 275 Grant Line Road, Tracy,". CA' <br /> A transit survey was performed .at the subject. site to , <br /> determine the relative elevations -of the well heads of. the <br /> three groundwater. monitorind we11s '.at, the subject site . <br /> The purpose of the survey was to determine the.'direction of " <br /> groundwater flow. , Light , non-aqueous phase . l.iquids <br /> (LNAPLs ) have been detected- in shallow •groundwater at the <br /> site and may, be :migrating as i: ,plume, as well as dissolving <br /> in the water , and volatilizing , <br /> The .flow of water in a saturated porous medium such as soil <br /> LI;. . is defined by Darcy ' s Law . This law states 'that- under <br /> saturated conditions., the volume of water. ,flowing -per unit <br /> area , per unit time (Q/At=v) . is directly proportional to <br /> the product of hydraulic conductivity ._(K), _of. that soil and. <br /> the hydraulic gradient (h/L) ; <br /> t v=K hl L, <br /> Measurements acquired. at the. site appear in Table 1.: <br /> ry Table 1 <br /> Well Head Elevations and Depth to Groundwater at 275 Grant <br /> Line Road, Tracy, ..CA, November 23 , 1.993 - <br /> Well Head Depth to Relative Groundwater <br /> Well Elevation* Groundwater . Elevations <br /> Number' ( ft ) ( ft ) ( ft) <br /> - -----------------------------i-------------�----------- . ---- <br /> MW-1 60 . 51 8 . 1.0 52 . 41 <br /> } MW'-2 59...40 7 . 110 :. 52.. 30 <br /> MW-3 60 . 057 . 56 52 . 49 <br /> *Well head. elevations. were determined with respect to an <br /> arbitrary datum established at- the edge of '.a concrete <br /> i f opting, f or a light standard ,l ocat:ed at t-he southeast- . <br />