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r <br /> AL3 <br /> LATHROP PROPERTY <br /> WKA No, 1184.02 <br /> Jarluary 30, 1392 <br /> Pago 6 <br /> although these mixtures often grade into beds of ciaystone, siltstono and sandstone. <br /> Conglomerate "sand and gravel" zones also are common. <br /> t <br /> � r <br /> The property is located within the San Joaquin River Hydrologic Basin, as defined by the <br /> a California Department of Water Resources(DWR). Historic ground water elevation date in the <br /> vicinity of the property are available as a result of biannual measurements taken In a DWR- <br /> monitored well (No. 015106E-26K01) located approximately 314-mils easterly from the <br /> f property (Plate 1) <br /> Ground water elevations measured in the DWR well have fluctuated from a maximum of 13 <br /> feat MSI.during the spring of 1983 to a minimumof-9 feet MSL during the surnmer of 1977. <br /> The grniind_surfaee elovation at the is reported as 17 feet MSL <br /> he we . Ground water at this <br /> location has therefore fluctuated from 4- to'20-fee t beneath"the ground-surface. Regional <br /> 1 : ground water flow direction in the vicinity of the property is indicated to be northeasterly,prepared byas <br /> tha <br /> 1, <br /> shown an the Spring, 1990, Lines of Equal Elevation of Waterin Wells map p p . <br /> San Joaquin County Flood Control and Water Conservation District. <br /> 5._ <br /> The nearest water supply well and septic system to the property aro located at the residence <br /> adjacent to the northerly property boundary. 'rho nearest well and septic system are for <br /> domestic purposes. Approximately 20 feet of open space exist between the adjacent E <br /> residential site and the area of the subject property for which we performed our environmental E <br /> site assessment. <br /> Gengral Prager is r <br /> l 1 An analysis of stereoscopic aerial photographs dating back to 1963 and interviews with <br /> i parsons fan automobile <br /> amiliar with the property history revealed that it was once <br /> the site°fa©ntiy utilized <br /> service station. The station had been known as Wiggins Trading Post and app <br /> rpartially buried railroad tank car for fuel storage. Actual <br /> underground storage tank(s)and/ora <br /> .6 <br /> .�. years of operation are not known, although the facility reportedly,ceased operation in the <br /> 1960s. The fuel storage tankfs)are said to have been removed bye private party:in the early <br /> 1970s.' <br /> WAkLACC•KUHL <br /> p r.AhrtlCE.47Er INC- <br />