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Petaluma 12th Naval District Target No. 9
measured at 1,860 cubic feet per second (cfs) and occurred on 22 December 22 1955.
The corresponding gage height was 13.55 feet.
High water on the Petaluma River, as well as localized heavy rainfall, may cause flooding
at the site. The flat marshy area within the site area could delay drainage of surface water
and extend the duration of flooding5
3.4.2 Ground Water
The Petaluma fiver defines one of the five major valleys, which run north-south, north of
the San Francisco area. The principal water-yielding materials of the north San Francisco
Bay area valleys are unconsolidated and semi-consolidated marine and continental
sediments and unwelded beds of tuffaceous volcanic rocks. Consolidated rocks of
Cretaceous and Jurassic age that underlie the entire area have little permeability and form
the boundaries of the ground-water flow system. The permeability and extent of water-
yielding deposits varies considerably.
The groundwater is under unconfined conditions at the site surface where the water can
be seen standing. Groundwater is confined or semi-confined in deeper parts of the
alluvial deposits and non-alluvial formations. The ground water flow in both systems is
generally toward the Petaluma River.
The surface water at the site is saltwater and is not a potable source of water. The
ground-water quality, however, is generally good for most uses. There is a large area of
concern over high nitrate concentrations in an area two miles north of this site. These
contaminants have been pulled to the surface from the large groundwater withdrawals in
the Petaluma area.6
3.5 ECOLOGY
The U.S. Fish and Wildlife Service (USFWS) have indicated that the following Federally
listed threatened (T) or endangered (E) species, or those proposed to be listed as such
(PT) or (PE) may occur on or near Petaluma:
Guadalupe fur seal, Arctocephalus townsendi, (T); Steller (northern) sea-lion,
Eumetopiasjubatus, (T); marbled murrelet, Brachyramphus marmoratus, (T); marbled
murrelet, Brachyramphus marmoratus, (T); western snowy plover, Charadrius
alexandrinus nivosus, (T); bald eagle, Haliaeetus leucocephalus, (T); northern spotted
owl, Strix occidentah caurina, (T); loggerhead turtle, Caretta caretta, (T); green turtle,
Chelonia mydas (incl. agassizi), (T); olive (Pacific) ridley sea turtle, Lepidochelys
olivacea, (T); California red-legged frog, Rana aurora draytonii, (T); delta smelt,
Hypomesus transpacrficus, (T); coho salmon - central CA coast, Oncorhynchus kisutch,
(T); Central California Coastal steelhead, Oncorhynchus mykiss, (T); Northern California
steelhead, Oncorhynchus mykiss, (T); Central Valley spring-run chinook salmon,
Section 3 - Site Description
Page 9