The site (Goleta Beach/Slough) was monitored prior to the field work by taking photos of
the migrating slough mouth on a weekly basis during the spring and summer until
the Slough became impounded and flow stopped.
Preliminary background work included ocean water sampling and Slough
sampling to examine variability associated with the bacteria samples and
establish baseline conditions. The
results showed that the variability in term of indicator organisms within each
water samples was very high in the ocean samples. Four replicates for each
sample location was chosen because this number represented the maximum number of
samples that could be processed with the time and budget constraints of the
research. Further, a scientist from SCCWRP confirmed that the number of
replicates (four) was adequate to determine if significant differences existed
between the sample sites and control sites (Schiff, pers. comm.,2000).
The following day the County artificially breached the Slough during a low tide and sampling began within 4 hours of the breach. Samples were collected inside the Slough, directly in front of the Slough in the ocean, and downcoast at intervals of 50, 100, 200, and 400 yards from the source (see schematic below). Samples were also collected upcoast, at a distance of 50 and 250 yards. Fewer stations were chosen upcoast, because the prevailing ocean current is west to east, and bacteria levels were not expected to be high far upcoast in the direction of the current.
In addition to the bacterial samples, nitrate
samples were collected, and salinity and temperature measurement were
taken at each sampling site to be used as tracers parameters. Further,
longshore current velocities and flow rates out of the Slough
were measured each sampling day.
Last updated April 30, 2001