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' Harding Lawson Associates <br /> ' II SITE GEOLOGY <br /> The Stockton Distribution Facility is located on the northeastern portion of <br /> Routh and Ready Island in Stockton, California. The eastern portion of the island <br /> ' is bordered on the north by the San Joaquin River and on the south by the Burns <br /> ' Cutoff. The northern edge of the facility is approximately 500 feet south of the <br /> San Joaquin River. The Burns Cutoff is approximately 2800 feet south of the site. <br /> ' The Shell Oil Facility is bordered on the east by the Mobil Oil Company Stockton <br /> Terminal. <br /> Twenty-two wells have been installed at the Stockton facility (Plate 1). The <br /> wells were installed by Groundwater Technology between July 22 and 26, 1985, <br /> (Wells 1 through 12), and between April 1 and 3, 1986, (Wells 13 through 22). The <br /> ' drilling logs and well completion details are presented in an appendix. The wells <br /> range from 26 to 28 feet in depth. <br /> ' Geologic cross sections based upon these drilling logs were prepared by <br /> HLA. The locations of the cross sections are shown on Plate 2. Cross sections are <br /> shown on Plates 3 through 5. Lines have been drawn separating the silty sand and <br /> ' sand units from the clay and silt units. The key to the soil classifications is shown <br /> on Plate 15. <br /> ' The geology of the site is consistent with that expected of a deltaic region. <br /> The materials encountered during drilling consist of fine-grained materials <br /> ' overlain by coarser sediments. The coarse-grained sediments are predominantly <br /> brown sands and sand-silt mixtures, with minor lenses of brown silty clays. In <br /> Borings 15, 17, and 18, in the southeastern portion of the site, the sand and silt <br /> ' unit also contains some gravel. The coarse-grained sediments occur from the <br /> November 24, 1987 2 of 9 <br /> ' B2203-R <br />