WASHINGTON(MarketWatch) -- U.S. private-sector firm employment rose 42,000 in July, according to the ADP employment report released Wednesday. "July's rise in private employment was the sixth consecutive monthly gain," said Joel Prakken, chairman of Macroeconomic Advisers, which produces the report from anonymous payroll data supplied by ADP. "However, over those six months increases have averaged a modest 37,000, with no evidence of acceleration." On Friday, the government is scheduled to report nonfarm payrolls for July, and economists polled by MarketWatch are looking for a decline of 60,000. That payrolls estimate includes an expected increase of 96,000 jobs in the private sector, and layoffs of about 145,000 temporary Census workers.