If possible always engineer and build a larger system than code actually requires so that if you decide to add on or sell you can get your project done without a lot of hassle...... Codes are revised over time so it can make upgrading to a newer system to be very cost prohibited (especially if you are dealing with ledge or near wetlands).
Also, ALWAYS design your system to be compatible with the use of a garbage disposal, even if you don't use a garbage disposal. Subsequent buyers or user usually do want a garbage disposal.
A new septic system should be pumped at least every other year and it will provide a lifetime of worry free use.
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