Richard Davis feels like he’s swimming upstream a lot of the time, fighting a bad economy, extensive regulation and less-than-scrupulous contractors. But the owner of Quick Response Septic Services keeps moving forward.The Grass Valley, Calif., businessman keeps his septic trucks busy. He is expanding his portable restroom business and looking for other ways to diversify operations, such as turning his grease collections into biodiesel fuel.“You’ve got to branch out and diversify or you’re not going to make it,” Davis says. Eighty percent of his septic business is residential pumping and 20 percent commercial work. A decline in home construction and
