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Geologic and hydrogeologic data from the Salinas Valley groundwater basin, including Marina and former Fort Ord, with respect to the potential for seawater intrusion.
This report evaluated the then current state or potential for seawater intrusion in the city of Marina and the former Fort Order area. Groundwater from this area primarily supplied drinking water wells as opposed to agricultural wells. Aquifers evaluated in this study area include the perched zone or A-aquifer, the Pressure 180-Foot Aquifer (180-Foot Aquifer), the Pressure 400-Foot Aquifer ( 400-Foot Aquifer), the Deep Aquifer, and aquifers within the Purisima and Santa Margarita Formations. The I80-Foot and 400-Foot Aquifers are the focus of this study because both aquifers outcrop along the canyon walls of Monterey Bay where they interface with seawater. Ground water withdrawal from the Salinas Valley, primarily for agricultural irrigation, has steadily resulted in seawater intrusion in the I 80-Foot Aquifer and the 400-Foot Aquifer, proportional to the use of each aquifer. Seawater has currently intruded (as defined by chloride concentrations exceeding 500 mg/L) about 6 miles in the 180-Foot Aquifer and about 3 miles in the 400-Foot Aquifer along the Salinas Valley floor (MCWRA, 2001). Beneath the Marina and former Fort Ord area, seawater has intruded about 2 miles in the 180-Foot Aquifer and about 3 miles in the 400-Foot Aquifer,
Monterey County Water Resources Agency
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"2001 - Hydrogeologic Investigation of Salinas Valley Basin in the Vicinity of Fort Ord and Marina Salinas Valley, California - Final Report" (2019). Monterey County Water Resources Agency Engineering Reports. 7.