2.8.1.1
Protective Outer Casing [and Bollards]
ASTM A 53, Type E or S, Grade B.
2.8.1.2
Well Casing Cap
Provide cap on top of the protective outer casing. Cap shall be flush
threaded and of the same material as the protective outer casing. Threaded
joints shall be wrapped with fluoropolymer tape and provided with nitrile
O-ring gaskets.
2.8.2
At-Grade Completions
Provide [cast iron] [aluminum] vault box, [750 by 750 mm30 by 30 inches] [
300 mm12 inch diameter] [_____], with watertight frame and cover. Vault
shall support [H-20 loading for traffic areas] [a 45,360 kg 100,000 pound
loading for airfield locations]. The frame shall be 150 mm 6 inches deep,
and shall be set in a concrete collar a minimum of 200 mm 8 inches thick,
and extending 100 mm 4 inches beyond the edge of the frame in all
directions. Frame and concrete collar shall be [set flush with the level
of the existing pavement] [set 75 mm 3 inches above the existing grade].
Locking well cap shall be provided on top of the well casing, which will
terminate inside the vault as indicated.
2.9
POLYEHTYLENE SHEETING
ASTM D 4397.
PART 3
EXECUTION
3.1
GENERAL
Notify the Contracting Officer at least 15 days prior to commencement of
work. Location[s] of well[s] shall be as indicated. Drilling,
installation, and development of the [monitoring] [extraction] well[s]
shall be supervised, directed, and monitored by the CPC. Drilling,
sampling, and well development equipment introduced to the well shall be
decontaminated before and after each use in accordance with ASTM D 5088.
3.2
DRILLING
**************************************************************************
NOTE: Type of drilling equipment is dependent upon
site geology, hydrogeology, and intended use. If
possible, utilize drilling methods which do not
introduce water or drilling fluids into the
borehole. If other methods are required, drilling
fluid must be purged from the well during well
development.
**************************************************************************
Borehole shall be advanced using conventional [ [250] [_____] mm [10]
[_____] inch hollow-stem auger] [solid auger] [rotary wash] [_____]
drilling methods. If it is the opinion of the CPC that an alternate
drilling method is required, justification for a boring method change shall
be submitted to the Contracting Officer, and approval for the change
granted prior to drilling. Drill crew shall be experienced and trained in
drilling and safety requirements for contaminated sites.
SECTION 02525N
Page 12