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15 Site Hydrogeology <br /> The site is located on the eastern margin of the San Joaquin/Sacramento River <br /> delta. Site hydrogeology is largely influenced by the San Joaquin River to the west, the <br /> Walker Slough to the south and Mormon Slough/Port of Stockton turning basin to the <br /> north. <br /> Over the period of September 1988 to January 1990, depth-to-groundwater in three <br /> wells ranged from approximately -16 to -20 feet mean sea level (MSL). During this period, <br /> groundwater flow was generally toward the southeast to southwest. <br /> Since installation of the new wells by MARK in May and October 1993 (see Section <br /> 4 0), the depth-to-groundwater has varied from approximately -23 to -25 feet MSL. Since <br /> May 1993, the groundwater flow direction has varied from northwest to east-northeast, but <br /> generally east-northeast The groundwater gradient calculated from April 1994 data is less <br /> .� then 1 foot vertically per 100 feet horizontally (c0 01 ft/ft) <br /> The clayey nature of the soil underlying the site, the relatively flat groundwater <br /> gradient and the vaned groundwater flow directions over time suggests that horizontal <br /> movement of the groundwater is sluggish Groundwater conditions beneath the site in <br /> April 1994, are illustrated in Drawing 1-3 <br /> 16 Report Organization <br /> This report introduction summarizes the history of site remediation activities as well <br /> as geologic and hydrogeologic conditions Section 20 describes soil remediation activities <br /> conducted during 1993 Section 3 0 describes the work performed to remove and remediate <br /> the soil impacted by petroleum hydrocarbons as well as the analytical results of disposal and <br /> confirmation sampling. Section 4.0 presents a summary of previous groundwater <br /> FASCLOSE 1 14 92-1177102 36 <br />