Alum Rock Field, above interpretative center Posted on December 9, 2019 by Administrator Walking in Alum Rock this morning. Took a couple moments to capture some of the ambient sound. Lots of bird sound and the creek running below causing the ongoing white noise with a car driving through the middle of it in the valley below…. http://keayedwards.com/blog/wp-content/uploads/2019/12/Alum-Rock-above-Interpretive-Center.mp3