Laserfiche WebLink
west of the Port Admi n i strati on Hui l of rig s 11L is accessed from <br /> W. Washington blvd. , which can be reacheo from lnterstate 5 v_ a <br /> the Fresno Ave. exit. <br /> The surrounding area is zoned for industrial °s manufacturing; <br /> Tri -Delta Fertilizer company is to the north, a railroad :�.pjr can <br /> the east , and undeveloped vacant lard on the west. There are 110 <br /> residences within 1/2 rrmile 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 farmed by the meanderings of the Mokelumne , <br /> San Joaquin vy Calaveras rivers. The burns Cutoff is a short <br /> distance to the west; it empties into the Stockton Deepwater <br /> Channel ,lust to the north. <br /> Tne topography is essentially flat , Zvi th drainage tov-ards tre <br /> west at less than 5 per mile. Sediments consist primarily of <br /> • unconsolidated clays, silts, sands , and some gravels , typical c7� <br /> recent floodplain deposits. defer to Plate II for details. <br /> SOIL TYPES: <br /> According to a 1952 University of California publi _ation , 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 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 is 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 e <cavation during that work. There is some local data <br /> which indicates the water table may be as deep as 17 ; howe,eer , <br /> tidal -fluctuations can cause 5 to 6 feet of change in water depth <br /> in this area. Plate IV shows depth to groundwater , sea level <br /> datum, in the Spring of 1980, the highest recordea le%,els durarw <br /> the past 10 years. Plate V indicates the Locations of the we3 _ C <br /> used by the County to monitor groundwater depths. <br /> PRIOR USE OF REMOVED UST: <br /> 2 <br />