reprinted courtesy of ServiceMagic.com
All concrete work requires excavation
and grading. Flatwork needs a gravel base, plus whatever concrete
will be below the grade. If the ground is firm and climate is
mild, a gravel base may not be necessary. Your first step always
is removing vegetation and debris. Be careful when digging since
concrete must be placed on undisturbed soil. Also, don't dig too
deeply since soil can't be replaced but rather concrete will have
to fill your error. The excavated land should be as flat and level
as possible.
The following information can help answer some questions about excavating and grading.
The information gathered from a land survey is very important. A surveyor can find and define existing or new property lines. He or she can examine your deed for problems and locate the proper placing for wells, buildings, and fences.
Because of drainage
issues, the owner should know what kind of terrain the home is
on and if the soil expands when too much moisture is introduced.
Structural engineers can advise you on preventive solutions for
problems that may arise from expansive soil, saving you from future
difficulties.
A typical foundation can be dug out in one day. Keep the excavated dirt out of the way to allow concrete trucks to come in and pour the foundation. Make sure excavators know what trees, shrubs or other landscape items you want to keep so they steer clear of these objects as they dig. The hole for the foundation should be graded, or smoothed over, before concrete is delivered.
-- Tips courtesy of Service Magic