Hot temperatures, hot issue of immigration and cooler economy may be behind stifled market - CONCORD - Juan Huerta leaves his wife and seven children in Mexico for the summers to work in Concord. The 57-year-old farmworker struggles to find work in Jalisco, his home state, because summer is the rainy season, he said. Through the Monument Futures day labor program in Concord, he made $3,500 last summer. He returned to Concord this May ready to work again, but so far, there haven't been as many opportunities, he said."This year is very difficult. This week, I haven't worked at all,"...