As Nevada City grapples with issues dealing with its homeless population through a camping permitting process, Grass Valley has also increased its attention to its destitute. Grass Valley Police Department has received a growing number of calls for service involving words such as “transient,” squatter,” “homeless,” and “panhandler” in the last three years, said Police Chief John Foster at a recent presentation to the town’s City Council on collaborative efforts with area homeless services agencies. In 2010, there were 393 calls, representing 1.2 percent of the total calls for service. In 2011, that number jumped to 572 calls for service …