The City of Costa Mesa denies that its two-member city council "working groups" created in January are standing committees subject to the open meeting and public notice requirements of the Brown Act.  In a letter today responding to CalAware's May 10 challenge to that effect, City Attorney Thomas P. Duarte concludes that "no violations of the Brown Act have occurred" without responding to the arguments made by CalAware.  The latter's general counsel, Terry Francke, said he would recommend to the group's litigation committee that it file a court action seeking a judge's determination that would settle the dispute, plus an order to the city to conduct meetings of any of the working groups only in conformity with the open meeting law.