17 November 1976
PODED-G
Quarry, Rock Crushing, Screening and Central Mix Batch Plant Operations for
Cleanup at Enewetok Atoll, M.I.
b.
c.
Estimated bulking factors for in-place stone
35%¢
Percentage of yield from controlled quarry
+
blasting and excavating
15%-
d.
Average thickness of hard reef rock
2 feet +
e.
To insure a minimum buffer width of 100 feet
between the reef front and seaward edge of
the quarry site and a similar landward buffer
zone of 100 feet from the shoreline high water
mark, use 250 feet for the average width of
quarry.
‘3.
Estimated quarry surface area.
a.
Equivalent excavated rock volume
2000 c.y./1 + bulking factor
b.
=
2000/1.35
=
1,482 cu.yd.
Total volume of excavation to yield 1,482 cu.yd.
1482 cy/yield factor = 1482/0.15 = 9880 cu. yds
c.
Length of borrow site using an average depth of
2 feet and width of 250 feet
Length =
d,
(9880 c.y.)(27 c.f£./c.y.)
(2 ft) (250 ft)
= 534 feet
An experience factor has indicated a multiple
of 1.5 should be used for estimating the required
surface area of a potential coral ledge quarry site.
e.
The approximate surface area dimensions for the
armor shore quarry are 250 feet x 534 feet (1.5)
USE
E.
250 feet width x 800 feet length
ESTIMATED AREA OF BORROW SITE FOR CONCRETE AGGREGATE
1.
The borrow for concrete aggregates shall be obtained from
the disturbed undersized coral rock remaining after armor
stone quarry operations.
Crushing, screening and washing
of borrow materials will be required.