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Depending on the angle of the slope and how well you can maintain the soil and grass on the slope and of corse how much rain you get.
My sister, whose leaching field is on a 20 degree slope in her front yard had no problem....until...she dicided to resead her lawn.
To do this she had a machine come in and chop the soil and grass on her lawn up so the seed would get into the soil.
After this was done they had a few days of heavy rain and all this disturbed soil just washed down into the road and left gullies down to the leaching bed so it was a costly lawn project.
If you can maintain the lawn above the field you should be OK. and also regular schedualed tank pumping so no solids get into the field should always be observed so leaching field will work.
All fields will fail after XXX years depending on the Perc Test that will give the amount of fluids that your soil can handle.
The driest place on the property is probably the best place for the field.
Gerry
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