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• <br /> west of the Port Administration Buildings It is 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 is located in the southern portion of the Sacramento <br /> Valley, at the eastern end of what is referred to as the San <br /> Joaquin Delta This is a large area of sloughs , islands , and <br /> channels that were formed by the meanderings of the Mokelumne, <br /> San Joaquin & Calaveras rivers The Burns Cutoff is a short <br /> distance to the west , it empties into the Stockton Deepwater <br /> Channel gust to the north <br /> The topography is essentially flat, with drainage towards the <br /> west at less than 5' per mile Sediments consist primarily of <br /> unconsolidated clays , silts , sands , and some gravels , typical of <br /> • recent floodplain deposits Refer to PLATE 1 for details <br /> SOIL TYPES <br /> According to a 1952 University of California publication, soils <br /> in the area consist of Columbia silty clay loam, dredger fill , <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 I—II shows the <br /> general soil profile in the area <br /> DEPTH TO GROUNDWATER & LOCATION OF WELLS <br /> According to maps published by the County Flood Control District , <br /> groundwater is influenced by tidal action, and ranges from 5 to <br /> 10 feet below ground level Water did not enter the excavation <br /> which was about 10 ' deep after removal of the UST However, <br /> during reexcavation of the site in April , 1993 , the water table <br /> was found at a depth of 7 feet, and remained fairly constant <br /> during the work ELATE IV shows depth to groundwater, sea level <br /> datum, in the Spring of 1986 , the highest recorded levels during <br /> the past 10 years However, it is most likely that the water <br /> table in the Port area fluctuates with tidal forces , which may <br /> vary by 5 or 6 feet PLATE .Y indicates the locations of the <br /> wells used by the County to monitor groundwater depths <br /> • PRIOR USE OF REMOVED UST <br />