February 6th, 2009

Sampling event turned out to be a better than expected day precipitation-wise.  About 0.3” had fallen in the Santa Rosa area during the previous 24 hours.  By 10:00 AM the 24 hour total was up to 0.7”.  Runoff was evident at every site we visited.  All sites were sampled during this sampling event.


Sampling Events

The following sites were sampled on this day:

  • In Atascadero Creek at Bodega Hwy there was noticeable flow unlike the two previous events and, like the last event, a strong sulfide odor was released from the benthic sediments when waded in.

  • The water level in Atascadero Creek at Green Valley Road did not appear to be any higher than during the previous event and, as in the two previous events, the water did not appear to be flowing.  There was however some localized runoff occurring as indicated by a light brown plume of water mixing with the darker brown water of the stream.

  • Copeland Creek had 3-4 times more flow in them than during the previous sampling event.

  • Foss Creek had 3-4 times more flow in them than during the previous sampling event.

  • For the first time in our four visits (including site scouting) the direction of flow was noticeable in the Laguna de Santa Rosa near Sebastopol, but just barely.

  • At the Laguna de Santa Rosa downstream of confluence the water level was maybe 1.5’ higher than on our last visit and for the first time the direction of flow was evident.  In the 15-20 minutes we spent at this site the water level rose an additional 2” and began to flow over the bank and drain back into a low area.

  • The control site Upper Mark West  had moderate flow with a very slight tint of color indicating overland runoff.

  • The control site Upper Santa Rosa Creek had moderate flow with a very slight tint of color indicating overland runoff.