Page 367 - Materials Chemistry, Second Edition

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338 Waste Management Practices: Municipal, Hazardous, and Industrial
Inner casing cap
Locking casing cap
Vent hole
Lock
Protective casing
Drainhole
Ground surface

Surface seal
Well casing

Water table

Annular seal
Borehole

Filter pack
Well intake

Plug FIGURE 10.27 Typical
Completion depth groundwater monitoring well
(U.S. EPA, 1994).

10.4.29 RECORD KEEPING
As part of routine operations, the landfill facility must retain the following information (40 CFR
Part 258.29):

● Inspection records, training procedures, and notification procedures
● Gas-monitoring results from routine monitoring
● Design documentation for placement of leachate or gas condensate in a landfill
● Closure and postclosure care plans
● Any monitoring, testing, or analytical data
● Cost estimates and financial assurance documentation

10.5 CLOSURE
Subtitle D requires, at the time of landfill closure, the installation of a final cover (cap) system (40
CFR Part 258.60). The primary purposes of the cover are to minimize infiltration of rainwater (thus
limiting the production of leachate) and to prevent erosion (thus protecting buried wastes from
exposure and possible dispersal). The final cover system must be constructed to:
● Have a permeability less than 1 10 5 cm/sec
● Minimize infiltration through the landfill using a layer that contains at least 46 cm (18 in.)
of soil material (the ‘barrier layer’)
● Minimize erosion of the final cover using an ‘erosion layer’ that contains a minimum of
15 cm (6 in.) of soil material capable of sustaining plant growth