[The Well] Borehole specs for pump and treat

[Antonio Gennarini]

Dear list,

I'm in the process of having to draft some specs for a borehole that
will be used fro pump and treat purposes given some contamiantion issues
with ammonia, Cl and some metals that have leached from a bad landfill
lining.

Given the following:

*) GWL is approx 36m bgl.
*) Max allowable drawdown in aquifer is 5m
*) On site pump and treat facilities can only cope with max 2.7
liters/sec
*) ground level to 31m bgl is chalk and from 31 to 51 m bgl is sandstone
(borehole to be screened in the sandstone)

SO you have any particular recomendations to make (i.e. diameter, casing
material, gravel pack, pump characteristics)? I've only put a few drill
specs for monitoring boreholes in the past and have never really done
proper specs for abstraction boreholes.

I'd have to go back to the books and time is not on my side (as many
times is the case ...). Any good reading you can recommend from the
Internet?

THanks for your help.

Antonio

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[Jim Thurber]

I would consider casing diameter at 5 to 8 inch (not metric I know!) and
material of PVC (Sch 40 would work, Sch 80 more robust but remember slightly
reduces i.d.) or stainless steel for long-term use. Stainless may not be
compatible with the Cl levels if they are very high.

Larger diameter just eases future operations to clean/rehab the well.
Jim

Dear list,

Given the following:

THanks for your help.

Antonio

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