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D. Topography <br /> The Stockton Metropolitan Airport is located in the northern portion of the San Joaquin <br /> Valley. The land is essentially flat and slopes from east to west approximately five feet <br /> in two miles. There is a series of creeks and sloughs that traverse the.area and connect <br /> into the San Joaquin River west and north of the airport. The San Joaquin River joins the <br /> Sacramento River and flows through the Carquinez Straights into San Francisco Bay. <br /> Webers Slough flows through the airport. This slough starts about six miles east of the <br /> airport and drains a small local area. All other creeks and sloughs are located outside of <br /> F. airport property. <br /> ` E. Geology <br /> Stockton Metropolitan Airport is located in the northern portion of the San Joaquin <br /> Valley. The San Joaquin Valley and the Sacramento Valley to the north originally were <br /> an arm of the Pacific Ocean and were fed by steams from the Sierra-Nevada Mountains <br /> to the east and the Coastal Range to the west. The lower sediments in this area are <br /> marine deposits. The upper portion of soils in this area are fresh-water sedimentary <br /> deposits from the Sierra-Nevada Mountains. These materials were deposited in periods <br /> f <br /> of heavy precipitation. As a result, the deposits near the mountains are coarser than those <br /> + further to the west.. In the vicinity of the airport the soils range from sands to silts to <br /> clays deposited in various layers throughout the site. The surface soils throughout the <br /> area are black medium to highly plastic clays. <br /> F. Aviation Facilities <br /> E Principal activities at the airport consist of general aviation operations, Army National <br /> Guard Operations, Air Force flight training operations, and air cargo operations. Facilities <br /> for airline operations are available and were previously used at the airport. Currently <br /> there are no airline operations at the airport. The general aviation operations consist of . <br /> charter flights, private business and pleasure flights, and pilot training. <br /> There are five fixed base operators on the airport that provide fuel, aircraft maintenance, <br /> aircraft sales, charter flights, and pilot training. <br /> The California Army National Guard is a permanent aviation facility designed to support <br /> National Guard aviation units in Central California. The facility presently supports rotary <br /> rwing aircraft and a_few fixed wing aircraft. <br /> The air cargo facility consists of the Farmington Fresh operations and small aircraft <br /> support for the major package carriers such as Federal Express and United Parcel Service. <br /> i , F The Farmington Fresh facility is a fresh produce sorting, packing, and shipping facility <br /> which ships fresh produce all over the world with large cargo-type aircraft of the B747, <br /> f DC-10 and DC-8 class. <br /> 3-2 <br />