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Good advice, the lint in laundry waste water clogs the leach field prematurely, it is best to seperate waste water, when we built this place here, we installed a seperate tank/drywell to drain it off, it has a pipe that daylights on the side of a bank, keeps the area wet, might be a mosquito producer at worst, easily remedied with a stone pit or small drywell though. We used to do the site work for the local convienence stores around here that also dispense fuel, the tanks were filled right after they were set, to keep them from floating when a high water table existed. If you have access to a construction equipment rental house, you should look into the cost of a backhoe for a few days or a week, I can rent one for a week under $1000 per week delivered, with no insurance required around here. A competent operator could have that tank out and the hole prepared by noon, have a concrete tank delivered and set by a precast concrete supplier, then do the pipework, invert, outlet to the distribution box, (D-Box) set up to run your laterals, dig them so you can get the machine out and not run over the previously set ones, backfilling with a rubber tire machine you have to be careful. You'll need a 3-4 full size loads of clean #2 sieve size stone, few hundred feet of perforated pipe and a roll of red rosin paper to cover the stone on top of each lateral. Each lateral will take an equal portion of discharge from the tank, you can set the adjustment on the D-box for each, think we used to set the laterals at 1/8" per foot slope, been awhile I forget. I know with a helper, I could do the entire job in one day, ( we used to do 2 a day quite often, not bragging about it though, long days they were ) It may be wise to do a percolation test, have an approved design in hand, then order equipment and materials, but you may be able to save a significant amount by doing it yourself, than paying a contractors price. Unforseen things like ground water, rock, undesirable soil conditions cans low things down considerably, and make sure to call the " One Call" underground utility location service, have them mark off any utilities close by. Take a look on the internet, there are many typical designs to review, and if you or someone can operate a backhoe comfortably, their is good incentive to see what the job will cost on your own, it may prove out to be worth it. Contractors will usually be higher, overhead, profit and rightfully so, but when $$ are tight and you need something done, it's a good option in my opinion.
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