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1 <br />' west of the Port Administrar-ion Duiloings Et 15 accesseo from <br /> W. Washington Blvd. , which can be reached it om 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 iia <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 Makelumne, <br /> San Joaquin & Calaveras rivers. The Burns Cutoff is a short <br />' distance to the west; it empties into the Stockton Deepwater <br /> Channel just to the north. <br /> Tne topography is essentially flat, with drainage towards tyre <br /> west at less than 5 per mile. Sediments consist primarily o+ <br /> unconsolidated clays, silts, sands , and some gravels, typical car <br /> recent f l oodpl ai n deposits. Refer to Plate II for details. <br />' SOIL TYPES: <br />' According to a 1952 University of Caiifornia pub.lx:.-ation, soils <br /> in 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 /> I undifferentiated flood plain deposits. PIate III 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 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 did not <br /> enter the excavation during that work. There is some local data <br /> I which indicates the water table may be as deep as 17 ' ; however , <br /> tidal fluctuations carp cause 5 to 6 feet of change in water depth <br /> in this area. Plate IV shows depth to groundwater , sea level <br /> I datum, in the Spring of 19€36, the highest recorded l e,,el s c7ur2 r.Q <br /> the past 10 years. Plate V indicates zne iocations of the wei .s <br /> used by the County to monitor groundwater depths. <br /> PRIOR USE OF REMOVED UST: <br /> I <br />