Quotes are free and they are specific. A number with no explanation behind it is not much use to anybody.
Undersizing is the most common and most expensive mistake on interceptor work, and it is usually the result of sizing off floor area or seat count rather than off the fixtures. The calculation runs on sink volumes and flow rates, and the sewer district normally sets a minimum underneath it. Get it wrong low and you have a trap that overflows its capacity between any realistic service interval, which puts grease in the lateral and eventually brings a notice from the district. That is a costly way to save money on a vessel.
Between camera work, locating, cabling and jetting, most of what goes wrong underground can be identified and handled without opening the ground at all.
Yucaipa is home, and the work radiates out from there across the Inland Empire in every direction. If you are outside the usual radius, call and ask. We cover more ground than most shops our size.