Thanks to Jay Bishop for finding these two Warblers at Tech Park this morning (Mon).  When Pam and I first saw the Chestnut-sided it was foraging low down in the flowering Euc at the 'Vireo viewing' area at approx. 34.430796, -119.889397.  It then flew west and down into the ground vegetation on the north slope of the grove.  The Blackpoll was foraging in the Tipu trees in the west parking lot at approx. 34.430888, -119.892754.