Selection and emplacement of the appropriate filter pack;
Selection and emplacement of the annular sealants;
Providing proper security of the well;
Surveying the locations and elevations of the tops of the casings; and
Adequately developing the well.
All documents pertaining to the design, construction, and development of RCRA
monitoring wells should be kept by the owner/operator in the facility operating record and
submitted as part of the operating permit.
6.9
Specialized Well Designs
There are two cases where special monitoring well designs should be used:
Where the owner/operator has chosen to use dedicated pumps to withdraw
ground water samples; or,
Where separate low density and/or high density immiscible liquid phases may
be present.
Dedicated pumps should be fluorocarbon resin or stainless steel positive gas
displacement bladder pumps, or equivalent devices approved by the Regional Administrator.
The design of the dedicated sampling system should allow access to the well for the purpose
of conducting aquifer tests, maintaining the well (e.g., redevelopment procedures), and making
water level measurements. Dedicated sampling systems should be periodically inspected to
ensure that the equipment is functioning reliably. Samples should be withdrawn from the
system to evaluate the operation of the equipment, and the equipment should be checked for
damage.
Where light and dense phase immiscible layers are present, or are determined to
potentially occur after considering the waste types managed at the facility, specialized well
systems should be designed to allow collection of discrete samples of both the light and dense
phases. In certain cases, well screens that extend from above the water table to the lower
confining layer may be appropriate, but more frequently the presence of immiscible phases
will require that well clusters (or nests) or multilevel sampling devices be installed. Where
well clusters are employed, one well in the cluster may be screened at horizons where floaters
are expected, and another may be screened at horizons where dense phases are expected.
Other wells may be screened within other portions of the aquifer.
November 1992
6 52






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