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1 <br /> west of the Port Administration Buildings. It as accessed from <br /> W. Washington Blvd. , which can be reached from Interstate 5 via <br />' the Fresno Ave. exit. <br /> The surrounding area is zoned for industrial & manufacturing; <br />' Tri-Delta Fertilizer company is to the north, a railroad spur on <br /> the east, and undeveloped vacant land on the west. There are no <br /> residences within 1/2 mile of the site. Plate I shows the <br /> location of the property in relation to nearby features. <br />' GEOLOGIC & GEOMORPHIC SETTING: <br />' The property as located in the southern portion of the Sacramento <br /> Valley, at the eastern end of what as referred to as the San <br /> Joaquin Delta. This as a large area of sloughs, islands, and <br />' channels that were formed by the meanderings of the Mokelumne, <br /> San Joaquin & Calaveras ravers. The Burns Cutoff as a short <br /> distance to the west; at empties into the Stockton Deepwater <br /> Channel just to the north* <br />' The topography is essentially flat, with drainage towards the <br /> west at less than 5 ' per male. Sediments consist primarily of <br /> unconsolidated clays, silts, sands, and some gravels, typical of <br /> recent floodplain deposits. Refer to Plate II for details. <br />' SOIL TYPES: <br /> According to a 1952 University of California publication, soils <br /> an the area consist of Columbia salty clay loam, dredger fall , <br />' and "madeland. " The soil profile revealed by the removal of the <br /> UST indicated that the top 3-4 ' consists of fill , underlain by <br /> undifferentiated flood plain deposits. Plate III shows the <br />' general soil profile an the area. <br /> DEPTH TO GROUNDWATER & LOCATION OF WELLS: <br />' According to maps published by the County Flood Control District, <br /> groundwater as influenced by tidal action, and ranges from 5 to <br /> 10 feet below ground level . Soil samples were taken at a depth <br />' of 10 feet, beneath the site of the removed UST; water dad not <br /> enter the excavation during that work. There as some local data <br /> which indicates the water table may be as deep as 17 ' : however , <br /> ' tidal fluctuations can cause 5 to 6 feet of change an water depth <br /> in this area. Plate IV shows depth to groundwater, sea level <br /> datum, an the Sprang of 1986, the highest recorded levels during <br /> the past 10 years. Plate V indicates the locations of the wells <br /> used by the County to monitor groundwater depths. <br /> PRIOR USE OF REMOVED USTz <br /> 2 <br />